CN114268777A - Starting method of laser projection equipment and laser projection system - Google Patents
Starting method of laser projection equipment and laser projection system Download PDFInfo
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- CN114268777A CN114268777A CN202111560475.2A CN202111560475A CN114268777A CN 114268777 A CN114268777 A CN 114268777A CN 202111560475 A CN202111560475 A CN 202111560475A CN 114268777 A CN114268777 A CN 114268777A
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Abstract
The application discloses a starting method of laser projection equipment and a laser projection system, and belongs to the technical field of laser projection. The method comprises the following steps: responding to a starting instruction, and after the laser projection equipment is powered on, projecting a starting picture with a plurality of characteristic graphs to a projection screen; acquiring a shot image obtained by shooting a projection screen by a camera; and if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic pattern in the shot image. The laser projection equipment can hide the process of correcting the projected image to be displayed in the starting process of the laser projection equipment, so that the efficiency of correcting the projected image to be displayed by the laser projection equipment is effectively improved.
Description
Technical Field
The present disclosure relates to laser projection technologies, and in particular, to a starting method of a laser projection apparatus and a laser projection system.
Background
The ultra-short-focus laser projection device can project and display the projection image on the projection screen. For the ultra-short-focus laser projection device, because the light is emitted obliquely upwards due to the principle of projection imaging, the position between the laser beam emitted by the optical engine in the ultra-short-focus laser projection device and the projection screen must be aligned strictly, and the slight displacement of the ultra-short-focus laser projection device can also cause the deformation or distortion of the picture. If the user moves the ultra-short-focus laser projection device carelessly, the projection image projected and displayed by the ultra-short-focus laser projection device may exceed the projection screen, resulting in poor display effect of the displayed projection image.
Disclosure of Invention
The embodiment of the application provides a starting method of laser projection equipment and a laser projection system. The problem of the relatively poor display effect of the projected image of prior art can be solved, technical scheme is as follows:
in one aspect, a method for starting up a laser projection apparatus is provided, where the method includes:
responding to a starting instruction, and after the laser projection equipment is powered on, projecting a starting picture with a plurality of characteristic graphs to a projection screen;
acquiring a shot image obtained by shooting the projection screen by a camera;
and if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic graph in the shot image.
In another aspect, a laser projection system is provided, comprising: the system comprises laser projection equipment, a projection screen and a camera; the laser projection device is configured to:
responding to a starting-up instruction, and after the laser projection equipment is powered on, projecting a starting-up picture with a plurality of characteristic graphs to the projection screen;
acquiring a shot image obtained by shooting the projection screen by the camera;
and if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic graph in the shot image.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the laser projection equipment can project a startup picture with a plurality of characteristic patterns to the projection screen in the startup process. In this way, after the laser projection device acquires the shot image shot by the camera on the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shot image. After the laser projection equipment projects the corrected projection image to the projection screen, the corrected projection image does not exceed the projection screen, and the good display effect of the projection image presented on the projection screen can be ensured. The laser projection equipment can realize the correction process of the projected image to be displayed without triggering a correction instruction manually by a user, and the correction process of the projected image to be displayed by the laser projection equipment can be hidden in the starting process of the laser projection equipment, so that the interaction process of the user and the laser projection equipment is simplified, the efficiency of correcting the projected image to be displayed by the laser projection equipment is effectively improved, and the user experience is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser projection system provided in an embodiment of the present application;
fig. 2 is a flowchart of a startup method of a laser projection apparatus according to an embodiment of the present disclosure;
fig. 3 is a flowchart of another startup method of a laser projection apparatus according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a boot-up screen according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of another boot-up screen according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a laser projection system according to an embodiment of the present disclosure. The laser projection system 100 may include: a laser projection device 101, a camera 102 and a projection screen 103.
Among them, the laser projection apparatus 101 may be an ultra-short-focus laser projection apparatus such as a laser television. The projection screen 103 may be typically hung on a wall, and the laser projection device 101 may project pictures onto the projection screen 103 so that the projection screen 103 can present corresponding pictures.
The lens of the camera 102 may be an ultra-short-focus ultra-wide-angle lens. The camera 102 may be mounted on the laser projection device 101, and the camera 102 needs to be directed towards the projection screen 103. Here, the camera 102 may be electrically connected to the laser projection apparatus 101.
In this way, when there is a deviation between the picture projected by the laser projection apparatus 102 and the projection screen 103, and the laser projection apparatus 101 projects the correction image onto the projection screen 103, the laser projection apparatus 101 may control the camera 102 to shoot the projection screen 103, and the camera 102 may transmit the image shot by the camera to the laser projection apparatus, so that the laser projection apparatus 101 can correct the projection image to be displayed based on the positional relationship between the projection screen and the correction image in the image shot by the camera. In this way, the deviation between the projection image to be displayed after correction and the projection screen 103 when displayed on the projection screen 103 is small.
In the related art, after a deviation exists between a picture projected by a laser projection device and a projection screen, a user is required to manually trigger a correction instruction. For example, a user may trigger a correction instruction via a projection client installed in a mobile terminal (e.g., a cell phone) communicatively coupled to the laser projection device. For example, the display interface of the projection client may display a correction button, and the projection client may generate a correction instruction after detecting a click operation of the user on the correction button. The projection client may then send the correction instructions to the laser projection device. After receiving the correction instruction sent by the projection client, the laser projection device can respond to the correction instruction to correct the projection image to be displayed. The process of correcting the projected image projected by the laser projection apparatus is complicated.
However, the manner of manually triggering the correction instruction is complicated, which results in low efficiency of the laser projection device in correcting the projected image to be displayed.
Referring to fig. 2, fig. 2 is a flowchart illustrating a startup method of a laser projection apparatus according to an embodiment of the present disclosure. The method for turning on the laser projection apparatus is applied to the laser projection apparatus 101 in the turn-on projection system 100 shown in fig. 1. The starting method of the laser projection equipment can comprise the following steps:
In this embodiment, after the laser projection device receives the power-on instruction, the laser projection device may perform a power-on operation in response to the power-on instruction. After completion on the laser projection device, the laser projection device may project a startup picture with a plurality of feature patterns to the projection screen.
In the embodiment of the application, after the laser projection device projects the startup picture to the projection screen, the laser projection device can control the camera to shoot the projection screen, and the laser projection device can also acquire a shot image obtained by shooting the projection screen by the camera.
And step 203, if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic graph in the shot image.
In this embodiment of the application, after the laser projection device acquires the shot image, it may detect whether the projected image to be displayed needs to be corrected according to the shot image. If the laser projection device detects that the projected image to be displayed needs to be corrected, the laser projection device may correct the projected image to be displayed based on the feature pattern in the captured image.
To sum up, according to the startup method of the laser projection device provided in the embodiment of the present application, the laser projection device may project a startup picture with a plurality of characteristic patterns to the projection screen in the startup process. In this way, after the laser projection device acquires the shot image shot by the camera on the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shot image. After the laser projection equipment projects the corrected projection image to the projection screen, the corrected projection image does not exceed the projection screen, and the good display effect of the projection image presented on the projection screen can be ensured. The laser projection equipment can realize the correction process of the projected image to be displayed without triggering a correction instruction manually by a user, and the correction process of the projected image to be displayed by the laser projection equipment can be hidden in the starting process of the laser projection equipment, so that the interaction process of the user and the laser projection equipment is simplified, the efficiency of correcting the projected image to be displayed by the laser projection equipment is effectively improved, and the user experience is better.
Referring to fig. 3, fig. 3 is a flowchart illustrating a startup method of another laser projection apparatus according to an embodiment of the present disclosure. The method for turning on the laser projection apparatus is applied to the laser projection apparatus 101 in the turn-on projection system 100 shown in fig. 1. The starting method of the laser projection equipment can comprise the following steps:
For example, a user may trigger a power-on command via a mobile device communicatively coupled to the laser projection device. The mobile device may be a mobile terminal such as a mobile phone, and the mobile device may also be a remote controller paired with the laser projection device. In a possible case, when the mobile device is a mobile terminal, a display interface of a projection client installed in the mobile terminal may display a start-up button, the projection client may generate a start-up instruction after detecting a click operation of a user on the start-up button, and the projection client may send the start-up instruction to the laser projection device. In another possible case, when the mobile device is a remote controller, a power-on button may be integrated on the remote controller, and after the remote controller detects a pressing operation of a user on the power-on button, a power-on instruction may be generated and sent to the laser projection device.
In this embodiment, after the laser projection device receives the power-on instruction, the laser projection device may respond to the power-on instruction, so that the laser projection device may perform the power-on operation. In the process of starting up the laser projection apparatus, the laser projection apparatus needs to perform power-on operations on various devices (e.g., a laser, a light valve, etc.) integrated therein, and also needs to perform an initialization process on various functional modules (e.g., a laser projection motherboard, a motion compensation module, an image display module, etc.) integrated therein.
In the application, after the laser projection equipment is powered on, devices such as a laser and a light valve in the laser projection equipment can work normally, so that the laser projection equipment can project a startup picture with a plurality of characteristic patterns to a projection screen.
For example, as shown in fig. 4, fig. 4 is a schematic diagram of a boot-up screen provided in an embodiment of the present application. The startup picture projected by the laser projection device may include: a main screen 01, and a plurality of feature patterns 02 surrounding the main screen. The main picture 01 may be a startup animation or a brand icon; the feature pattern 02 may be a diamond, a five-pointed star, a cross, or the like. The plurality of feature patterns 02 may be uniformly distributed around the main screen 01, and each feature pattern 02 in the startup screen may be the same or different, which is not limited herein.
In this application, in order to facilitate the subsequent laser projection device to correct the projection image to be displayed based on the feature pattern in the startup picture, the color of each feature pattern 02 in the startup picture may be different from the background color of the region other than the main picture in the startup picture.
For example, as shown in fig. 4, the shape of the feature pattern 02 in the startup picture is a diamond, and the color of the feature pattern 02 is black; the color of the background color in the startup picture except the region between the main pictures is white.
For another example, as shown in fig. 5, fig. 5 is a schematic view of another boot-up screen provided in the embodiment of the present application. The shape of the characteristic graph 02 in the startup picture is a five-pointed star, and the color of the characteristic graph 02 is white; the color of the background color in the startup picture except the region between the main pictures is black.
In the embodiment of the application, after the laser projection device projects the startup picture to the projection screen, the laser projection device can control the camera to shoot the projection screen. The camera can obtain the shooting image after shooting the projection screen, and the camera can send this shooting image to laser projection equipment. Therefore, the laser projection equipment can acquire a shot image shot by the camera on the projection screen.
Because the projection screen can present the startup picture projected by the laser projection equipment, the shot image obtained after the camera shoots the projection screen can be: including the projection screen and the image of the boot-up picture presented on the projection screen.
And step 303, detecting whether the projected image to be displayed needs to be corrected according to the shot image.
In this embodiment of the application, after the laser projection device obtains the shot image, the laser projection device may detect whether the projected image to be displayed needs to be corrected according to the shot image. The projection image to be displayed refers to a projection image to be projected by the laser projection apparatus but not yet projected.
For example, if the laser projection device detects that the projected image to be displayed needs to be corrected according to the captured image, step 304 is executed; if the laser projection device detects that the projected image to be displayed does not need to be corrected according to the shot image, step 305 is executed.
In the present application, there are various ways for the laser projection device to detect whether the image to be displayed needs to be corrected according to the captured image, and the embodiment of the present application is schematically described by taking the following three optional implementation manners as examples:
in a first optional implementation manner, the laser projection apparatus detecting whether the image to be displayed needs to be corrected according to the captured image may include:
step A1, according to the shot image, detecting whether the start-up picture in the shot image exceeds the frame of the projection screen.
In the embodiment of the application, the shot image may include a projection screen and a startup picture presented on the projection screen. Therefore, the laser projection equipment can detect whether the startup picture in the shot image exceeds the frame of the projection screen. For example, if the laser projection apparatus detects that the start-up picture in the captured image exceeds the border of the projection screen, step B1 is executed; if the laser projection device detects that the startup picture in the captured image does not exceed the frame of the projection screen, step C1 is executed.
In the present application, there are various ways for the laser projection device to detect whether the startup picture in the captured image exceeds the frame of the projection screen, and the following two possible cases will be taken as examples in the embodiment of the present application for schematic description.
In a first possible scenario, the laser projection device may determine the outline of the border of the projection screen, as well as the outline of the startup picture, in the captured image. If the laser projection device detects that at least part of the area surrounded by the outline of the startup picture is located outside the area surrounded by the outline of the frame of the projection screen, the laser projection device may determine that the startup picture in the captured image exceeds the frame of the projection screen, and at this time, the laser projection device needs to execute the following step B1; if the laser projection device detects that the area surrounded by the outline of the startup picture is all located in the area surrounded by the outline of the frame of the projection screen, the laser projection device may determine that the startup picture in the captured image does not exceed the frame of the projection screen, and at this time, the laser projection device needs to perform the following step C1.
Illustratively, the color of the projection screen is typically black (or gray) since it is in the captured image. Therefore, in order to enable the laser projection device to distinguish the projection screen from the startup picture in the captured image, the background color of the startup picture projected by the laser projection device may be set to be white, that is, the startup picture projected by the laser projection device is the startup picture shown in fig. 4.
In this case, the laser projection apparatus may determine the position of the outline of the frame of the projection screen in the captured image and the position of the outline of the startup picture in the captured image according to the gradation values of the respective pixels in the captured image. Therefore, the laser projection equipment can determine the position relation between the area surrounded by the outline of the startup picture and the area surrounded by the outline of the frame of the projection screen according to the position of the outline of the frame of the projection screen in the shot image and the position of the outline of the startup picture in the shot image so as to determine whether the startup picture in the shot image exceeds the frame of the projection screen.
In a second possible case, the laser projection device may determine the target projection positions of the respective feature patterns of the startup picture on the projection screen according to the captured images. If the laser projection device detects that the deviation between the target projection position of the characteristic pattern on the projection screen and the initial position of the characteristic pattern on the projection screen is larger than a preset value, and the startup picture in the shot image exceeds the frame of the projection screen, at this moment, the laser projection device needs to execute the following step B1; if the laser projection apparatus detects that the deviation between the target projection position of the feature pattern on the projection screen and the initial projection position of the feature pattern on the projection screen is not greater than the preset value, and it is determined that the startup picture in the captured image does not exceed the frame of the projection screen, then the laser projection apparatus needs to perform the following step B2.
Here, the initial positions of the feature patterns in the startup picture on the projection screen are: and when the starting-up picture does not exceed the projection screen, the positions of all characteristic graphs in the starting-up picture on the projection screen. In other possible implementations, since the outer boundary of the startup picture coincides with the inner boundary of the frame of the projection screen when the startup picture does not exceed the projection screen, the position of each feature pattern in the startup picture can also be determined as the initial position of each feature pattern on the projection screen.
In this application, the laser projection device determines, according to the captured image, the target projection position of each feature pattern of the startup picture on the projection screen to be: the actual position of the feature on the projection screen. Therefore, whether the starting picture in the shot image exceeds the frame of the projection screen or not can be determined through the difference between the target projection position and the initial position of the characteristic graph on the projection screen.
It should be noted that, the manner in which the laser projection apparatus determines the target projection position of each feature pattern on the projection screen is described in detail later, and will not be described first.
And step B1, if the startup picture in the shot image is detected to exceed the frame of the projection screen, determining that the projected image to be displayed needs to be corrected.
In the embodiment of the application, if the laser projection device detects that the startup picture in the shot image exceeds the frame of the projection screen, the laser projection device determines that the projected image to be displayed needs to be corrected.
For example, when a startup picture in a captured image exceeds a frame of the projection screen, it is described that the startup picture projected by the laser projection device onto the projection screen exceeds the projection screen, and in order to ensure that a display effect of a subsequent laser projection device projecting a projection image onto the projection screen is good, the laser projection device needs to perform correction processing on the projection image to be displayed, and at this time, the laser projection device needs to perform the following step 304.
And step C1, if the startup picture in the shot image is detected to be the frame which does not exceed the projection screen, determining that the projection image to be displayed does not need to be corrected.
In the embodiment of the application, if the laser projection device detects that the startup picture in the shot image does not exceed the frame of the projection screen, the laser projection device determines that the projected image to be displayed does not need to be corrected.
For example, when the startup picture in the captured image does not exceed the frame of the projection screen, it is described that the startup picture projected by the laser projection device to the projection screen does not exceed the projection screen, the display effect of the picture displayed on the projection screen is better, and the laser projection device does not need to perform correction processing on the projection image to be displayed, and at this time, the laser projection device needs to perform the following step 305.
In a second optional implementation manner, the laser projection device detecting whether the image to be displayed needs to be corrected according to the captured image may include:
and A2, detecting whether the characteristic graph of the startup picture in the shot image deforms or not according to the shot image.
In the embodiment of the application, the shot image may include the startup picture, so that the laser projection device may detect whether the startup picture in the shot image is deformed. For example, if the laser projection apparatus detects that the feature pattern of the startup picture in the captured image is deformed, step B2 is executed; if the laser projection device detects that the feature of the startup picture in the captured image is not deformed, step B3 is executed.
In this application, if the laser projection device projects the startup picture to the projection screen, the shape of the feature pattern of the startup picture presented on the projection screen is consistent with the shape of the feature pattern of the startup picture, that is, the feature pattern of the startup picture presented on the projection screen is not deformed. If the laser projection device is inclined relative to the projection screen, after the laser projection device projects the startup picture to the projection screen, the shape of the characteristic graph of the startup picture presented on the projection screen is inconsistent with the shape of the characteristic graph of the startup picture, that is, the characteristic graph of the startup picture presented on the projection screen deforms.
For this reason, the laser projection apparatus can determine whether the shape of the feature pattern is deformed or not after recognizing the shape of the pattern of each feature in the captured image.
For example, the color of the feature pattern in the startup picture is different from the background color. Therefore, the laser projection apparatus can determine the distinguishing feature pattern in the captured image based on the gradation value of the captured pattern, and can determine the shape of the feature pattern.
It should be noted that, in order to facilitate the laser projection apparatus to check whether the shape of the feature pattern in the startup picture changes, the shape of the feature pattern of the startup picture projected by the laser projection apparatus may be set to a shape with obvious deformation. For example, the shape of the feature pattern may be a diamond or a pentagram, etc.
And step B2, if the deformation of the characteristic pattern is detected, determining that the projected image to be displayed needs to be corrected.
In the embodiment of the application, if the laser projection equipment detects that the characteristic pattern in the shot image is deformed, the laser projection equipment determines that the projected image to be displayed needs to be corrected.
For example, when the feature pattern of the startup picture in the captured image is deformed, which indicates that the laser projection device is inclined with respect to the projection screen, in order to ensure that the display effect of the subsequent laser projection device projecting the projection image onto the projection screen is good, the laser projection device needs to perform correction processing on the projection image to be displayed, and at this time, the laser projection device needs to perform step 304 described below.
And C2, if the characteristic graph is detected not to be deformed, determining that the projected image to be displayed does not need to be corrected.
In the embodiment of the application, if the laser projection equipment detects that the characteristic pattern in the shot image is not deformed, the laser projection equipment determines that the projected image to be displayed does not need to be corrected.
For example, when the feature pattern of the startup picture in the captured image is not deformed, which indicates that the display effect of the startup picture projected to the projection screen by the laser projection apparatus is good, the laser projection apparatus does not need to perform correction processing on the projection image to be displayed, and at this time, the laser projection apparatus needs to perform the following step 305.
In a third optional implementation manner, the laser projection device may simultaneously detect whether the start-up picture in the captured image exceeds the frame of the projection screen, and detect whether the feature pattern of the start-up picture in the captured image is deformed. For example, if the laser projection device detects that the startup picture in the captured image exceeds the frame of the projection screen and detects that the characteristic pattern of the startup picture in the captured image is deformed, the laser projection device determines that the projection pattern to be displayed needs to be corrected, and at this time, the following step 304 needs to be executed; otherwise, the laser projection apparatus determines that the projection pattern to be displayed does not need to be subjected to the correction process, and at this time, the following step 305 needs to be performed.
And step 304, if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic graph in the shot image.
In the embodiment of the present application, if the laser projection device detects that the projected image to be displayed needs to be corrected according to the captured image, the laser projection device may correct the projected image to be displayed based on the feature pattern in the captured image.
For example, the laser projection apparatus may determine a correction parameter based on a feature pattern in the captured image, and correct the projection image to be displayed based on the correction parameter.
Wherein the correction parameters may include: the corrected positions of a plurality of vertices in the projected image to be displayed in the first image coordinate system. If the projected image to be displayed is a quadrangle, the vertices of the projected image to be displayed may include an upper left vertex, a lower left vertex, an upper right vertex, and a lower right vertex.
The following describes a process of determining a corrected position of a target vertex in a first image coordinate system in a projection image to be displayed by a laser projection device, where the target vertex may be any vertex of the projection image to be displayed:
first, the laser projection device may determine a target projection position of the target feature pattern in the projection screen according to the perspective transformation coefficient of the camera and the position of the target feature pattern in the captured image. The target feature pattern may be a feature pattern closest to a projection position of the target vertex among the plurality of feature patterns. For example, assuming that the target vertex of the projection image to be displayed is the top right vertex, the target feature pattern may be a feature pattern located at the top right corner among the plurality of feature patterns. For example, referring to fig. 4, the target feature pattern may be a feature pattern 02 at the upper right corner of the power-on screen.
The perspective transformation coefficient can transform the position of any point in the projection screen into the position in the shot image, namely the perspective transformation coefficient is a variation coefficient between the screen coordinate system of the projection screen and the second image coordinate system of the shot image. The perspective transformation coefficient is related to the shooting position of the camera, the distance between the camera and the projection screen and the resolution of the camera.
Thereafter, the laser projection device may determine an actual relative position between the position of the target vertex of the border of the projection screen and the target projection position, and may determine an initial relative position between the position of the target vertex of the border and the initial projection position of the target feature. And the laser projection device can determine the target offset according to the actual relative position and the initial relative position. The target offset is an offset of a target vertex of the startup picture in a target projection position of the projection screen relative to an initial projection position of the projection screen. It will be appreciated that the target offset may be a vector comprising the direction of the offset and the magnitude of the offset value.
And the initial projection position of the target characteristic graph is the projection position of the target characteristic graph in the projection screen when the starting picture does not exceed the projection screen. The target vertex of the frame of the projection screen may be a vertex of the plurality of vertices of the frame that is in the same orientation as the target vertex in the projected image to be displayed. And the target vertex of the startup picture is a vertex in the same direction with the target vertex in the projected image to be displayed in the plurality of vertexes of the startup picture. For example, if the target vertex in the projection image to be displayed is the top right vertex of the projection image to be displayed, the target vertex of the frame is the top right vertex of the frame, and the target vertex of the startup picture is the top right vertex of the startup picture.
Further, the laser projection apparatus may determine, based on the target offset amount, a pixel offset amount of a target vertex of the projected image to be displayed in the first image coordinate system from a correspondence stored in advance, and thereby may determine a correction position of the target vertex of the projected image to be displayed in the first image coordinate system according to the pixel offset amount and an initial position of the target vertex of the projected image to be displayed in the first image coordinate system.
The pixel shift amount may be a vector including a shift direction and a shift value. The correspondence is a correspondence of an offset amount in the screen coordinate system and an offset amount in the first image coordinate system.
Based on the method, the laser projection equipment can determine the correction position of each vertex in the projection image to be displayed in the first image coordinate system, and can perform correction processing on the projection image to be displayed according to the correction position of each vertex in the projection image to be displayed in the first image coordinate system, so that the projection image after correction processing is obtained.
In the embodiment of the application, after the laser projection device corrects the projection image to be displayed, and when the laser projection device subsequently projects the corrected projection image to the projection screen, the corrected projection image does not exceed the projection screen, and the corrected image presented on the projection screen does not deform. Moreover, the laser projection apparatus needs to continue to perform the power-on operation.
And 305, if the projected image to be displayed is detected to be unnecessary to be corrected according to the shot image, continuing to execute the starting operation.
In the embodiment of the application, if the laser projection device detects that the projected image to be displayed does not need to be corrected according to the shot image, the laser projection device continues to execute the startup operation, so that each functional module in the laser projection device can complete the initialization process, and each functional module can be ensured to work normally.
It should be noted that, the sequence of the steps of the method for starting up a laser projection apparatus provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be increased or decreased according to the circumstances, and any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application is included in the protection scope of the present application, and therefore, no further description is given.
To sum up, according to the startup method of the laser projection device provided in the embodiment of the present application, the laser projection device may project a startup picture with a plurality of characteristic patterns to the projection screen in the startup process. In this way, after the laser projection device acquires the shot image shot by the camera on the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shot image. After the laser projection equipment projects the corrected projection image to the projection screen, the corrected projection image does not exceed the projection screen, and the good display effect of the projection image presented on the projection screen can be ensured. The laser projection equipment can realize the correction process of the projected image to be displayed without triggering a correction instruction manually by a user, and the correction process of the projected image to be displayed by the laser projection equipment can be hidden in the starting process of the laser projection equipment, so that the interaction process of the user and the laser projection equipment is simplified, the efficiency of correcting the projected image to be displayed by the laser projection equipment is effectively improved, and the user experience is better.
An embodiment of the present application further provides a laser projection system, and as shown in fig. 1, the laser projection system 100 may include: a laser projection device 101, a camera 102 and a projection screen 103.
Wherein the laser projection device 101 is configured to: in response to the startup instruction, after the laser projection device 101 is powered on, projecting a startup picture with a plurality of characteristic patterns to the projection screen 103; acquiring a shot image obtained by shooting a projection screen 103 by a camera 102; and if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic pattern in the shot image.
Optionally, the laser projection device 101 is configured to: detecting whether a starting-up picture in the shot image exceeds a frame of the projection screen or not according to the shot image; and if the starting picture in the shot image exceeds the frame of the projection screen, determining that the projected image to be displayed needs to be corrected.
Optionally, the laser projection device 101 is configured to: determining the outline of a frame of a projection screen and the outline of a startup picture in a shot image; and if the area surrounded by the outline of the starting-up picture is detected to be at least partially positioned outside the area surrounded by the outline of the frame of the projection screen, determining that the starting-up picture in the shot image exceeds the frame of the projection screen.
Optionally, the laser projection device 101 is configured to: determining the target projection position of each characteristic graph of the startup picture on the projection screen according to the shot image; and if the deviation between the target projection position of the characteristic graph on the projection screen and the initial position of the characteristic graph on the projection screen is detected to be larger than a preset value, determining that the starting picture in the shot image exceeds the frame of the projection screen.
Optionally, the laser projection device 101 is configured to: detecting whether the characteristic graph of the startup picture in the shot image deforms or not according to the shot image; and if the deformation of the characteristic graph is detected, determining that the projected image to be displayed needs to be corrected.
Optionally, the laser projection device 101 is further configured to: after the projected image to be displayed is corrected based on the characteristic graph in the shot image, continuing to execute the starting operation; or if the projected image to be displayed is detected from the shot image without correction processing, continuing to execute the startup operation.
Optionally, the laser projection device 101 is configured to: correction parameters are determined based on the photographed image, and the projected image to be displayed is corrected based on the correction parameters.
Optionally, the booting screen includes: the image processing device comprises a main picture and a plurality of characteristic graphs surrounding the main picture.
Optionally, the color of each feature pattern is different from the background color of the region other than the main picture in the startup picture.
In summary, the laser projection system provided in the embodiment of the present application includes: laser projection equipment, camera and projection screen. The laser projection equipment can project a startup picture with a plurality of characteristic patterns to the projection screen in the startup process. In this way, after the laser projection device acquires the shot image shot by the camera on the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shot image. After the laser projection equipment projects the corrected projection image to the projection screen, the corrected projection image does not exceed the projection screen, and the good display effect of the projection image presented on the projection screen can be ensured. The laser projection equipment can realize the correction process of the projected image to be displayed without triggering a correction instruction manually by a user, and the correction process of the projected image to be displayed by the laser projection equipment can be hidden in the starting process of the laser projection equipment, so that the interaction process of the user and the laser projection equipment is simplified, the efficiency of correcting the projected image to be displayed by the laser projection equipment is effectively improved, and the user experience is better.
The present application further provides a laser projection apparatus, which may include: the laser projection device comprises a processor and a memory, wherein at least one instruction is stored in the memory, and the instruction is loaded and executed by the processor to realize the starting method of the laser projection device shown in the figure 2 or the figure 3.
The embodiment of the application also provides a computer readable storage medium. The computer readable storage medium has stored therein instructions that, when run on a processing component, cause the processing component to perform a startup method that implements the laser projection device shown in fig. 2 or 3.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.
Claims (10)
1. A method for starting up a laser projection apparatus, the method comprising:
responding to a starting instruction, and after the laser projection equipment is powered on, projecting a starting picture with a plurality of characteristic graphs to a projection screen;
acquiring a shot image obtained by shooting the projection screen by a camera;
and if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic graph in the shot image.
2. The method of claim 1, further comprising:
detecting whether a starting-up picture in the shot image exceeds a frame of a projection screen or not according to the shot image;
and if the starting-up picture in the shot image exceeds the frame of the projection screen, determining that the projected image to be displayed needs to be corrected.
3. The method of claim 2, further comprising:
determining the outline of the frame of the projection screen and the outline of the startup picture in the shot image;
and if the fact that at least part of the area surrounded by the outline of the starting-up picture is located outside the area surrounded by the outline of the frame of the projection screen is detected, determining that the starting-up picture in the shot image exceeds the frame of the projection screen.
4. The method of claim 2, further comprising:
determining the target projection positions of all characteristic graphs of the startup picture on the projection screen according to the shot images;
and if the deviation between the target projection position of the characteristic graph on the projection screen and the initial position of the characteristic graph on the projection screen is detected to be larger than a preset value, determining that the starting picture in the shot image exceeds the frame of the projection screen.
5. The method of claim 1, further comprising:
detecting whether the characteristic graph of the startup picture in the shot image deforms or not according to the shot image;
and if the characteristic graph is detected to be deformed, determining that the projected image to be displayed needs to be corrected.
6. The method of any of claims 1 to 5, further comprising:
after the projected image to be displayed is corrected based on the characteristic graph in the shot image, continuing to execute starting operation;
or if the projected image to be displayed is detected according to the shot image without correction processing, continuing to execute the startup operation.
7. The method according to any one of claims 1 to 5, wherein correcting the projection image to be displayed based on the feature pattern in the captured image includes:
and determining correction parameters based on the characteristic graph in the shot image, and correcting the projected image to be displayed based on the correction parameters.
8. The method according to any one of claims 1 to 5, wherein the boot-up screen comprises: the image processing device comprises a main picture and a plurality of characteristic graphs surrounding the main picture.
9. The method according to claim 8, wherein a color of each of the feature patterns is different from a background color of an area other than the main picture in the boot-up picture.
10. A laser projection system, comprising: the system comprises laser projection equipment, a projection screen and a camera; the laser projection device is configured to:
responding to a starting-up instruction, and after the laser projection equipment is powered on, projecting a starting-up picture with a plurality of characteristic graphs to the projection screen;
acquiring a shot image obtained by shooting the projection screen by the camera;
and if the projected image to be displayed needs to be corrected according to the shot image, correcting the projected image to be displayed based on the characteristic graph in the shot image.
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| CN202111560475.2A CN114268777B (en) | 2021-12-20 | 2021-12-20 | Starting method of laser projection equipment and laser projection system |
| PCT/CN2022/101830 WO2023071256A1 (en) | 2021-10-29 | 2022-06-28 | Laser projection device, and correction method for projected image |
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