CN114693691B - Graph cutting method based on coordinate mapping for double sources and double visual angles - Google Patents
Graph cutting method based on coordinate mapping for double sources and double visual angles Download PDFInfo
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Abstract
The invention discloses a graph cutting method based on coordinate mapping of a double source and a double view angle, which comprises the following steps: s1: obtaining a main view angle image A and a side view angle image B according to the main view angle and the side view angle which are orthogonal to each other; s2: correcting the main visual angle image A and the side visual angle image B, wherein the corrected main visual angle image A and the corrected side visual angle image B are overlapped on one side; s3: cutting the main view angle image A to obtain a cut image P, wherein the cut image P is a single cut image P0 or a spliced cut image P'; s4: extracting coordinates T1 of a package image in the cut image P; s5: acquiring a coordinate T2, wherein the coordinate T2 is a coordinate mapped onto a main visual angle image A by the coordinate T1; s6: acquiring a coordinate T3, wherein the coordinate T3 is a package image coordinate acquired by a side view angle image B according to the coordinate T2; s7: the side view image B is cut based on the coordinates T3.
Description
Technical Field
The invention relates to the technical field of intelligent security inspection, in particular to a graph cutting method based on coordinate mapping for double sources and double visual angles.
Background
The security inspection equipment used in airport, railway and highway transportation is mainly based on single X-ray perspective imaging, but because articles in luggage to be inspected are often stacked together, only one detector is used for inspecting the imaging image of the luggage in one direction, and because the articles in the luggage are shielded and covered mutually, some articles which have smaller volumes along the X-ray direction but are clamped between articles with larger volumes cannot be detected, and the phenomenon of missed inspection is easy to occur, in the prior art, a double-source double-view security inspection method is generally adopted to reduce a single detection angle, so that the dangerous articles are missed, in the security inspection scene, the X-ray machine video signals are required to be converted into pictures, so that the cutting image processing is related to the video, but if a cutting image jigsaw method is adopted for two views under the double-source double-view scene, the defects of high performance loss and weak real-time performance exist. Therefore, the method for cutting the graph based on the coordinate mapping has important significance for solving the problems.
Disclosure of Invention
The invention aims to provide a dual-source dual-view graph cutting method based on coordinate mapping, which is used for solving the problems in the background technology.
In order to solve the technical problems, the invention adopts the following scheme:
a dual-source dual-view graph cutting method based on coordinate mapping comprises the following steps:
s1: obtaining a main view angle image A and a side view angle image B according to the main view angle and the side view angle which are orthogonal to each other;
s2: correcting the main visual angle image A and the side visual angle image B, wherein the corrected main visual angle image A and the corrected side visual angle image B are overlapped on one side;
s3: cutting the main view angle image A to obtain a cut image P, wherein the cut image P is a single cut image P0 or a spliced cut image P';
s4: extracting coordinates T1 of a package image in the cut image P;
s5: acquiring a coordinate T2, wherein the coordinate T2 is a coordinate mapped onto a main visual angle image A by the coordinate T1;
s6: acquiring a coordinate T3, wherein the coordinate T3 is a package image coordinate acquired by a side view angle image B according to the coordinate T2;
s7: the side view image B is cut based on the coordinates T3.
Further, the method also comprises the following steps:
s0: and obtaining a main view angle and a side view angle which are orthogonal to each other according to the coordinate mapping requirement and the movement direction of the conveyor belt of the security inspection machine.
Further, when S1 is performed: the main view angle image A and the side view angle image B are obtained at the same time.
Further, when S2 is performed: the main view angle image a and the side view angle image B are corrected based on the feature matrix method.
Further, when S3 is executed: the main view angle is provided with a detection area S and an identification area X, a graph cutting area Q is formed between the detection area S and the identification area X at the initial position, the detection area S is fixedly arranged, the identification area X moves along with a conveyor belt of the security inspection machine, and when the identification area X coincides with the detection area S, a graph is cut from a main view angle image A positioned in the graph cutting area Q, so that a single graph cutting image P0 is obtained;
further, when the identification area X coincides with the detection area S, the identification area X will be regenerated at the initial position.
Further, the size of the map-cutting area Q is m×n, and the sizes of the detection area S and the identification area X are a×n.
Further, S3 is repeatedly executed, and the main view image a is subjected to multiple image cutting, so as to obtain a spliced image cutting image P'.
Further, the method also comprises the following steps: step S31: the single cut image P0 or the spliced cut image P' is saved to the buffer area W.
Further, when the main view image a performs the first cropping, the cropping image P0 is stored in the buffer area W;
when the primary visual angle image A is subjected to secondary image cutting, a cut image P1 is obtained, the cut image P0 moves m towards one side of the movement direction of the conveyor belt of the security inspection machine, the cut image P1 is stored until the cut image P0 is stored in the original position of the buffer area W,
……
when the Nth image cutting is carried out on the main visual angle image A, an image cutting image P (N-1) is obtained, the image cutting image P (N-2) moves to one side of the moving direction of the conveyor belt of the security inspection machine by m, the image cutting image P (N-1) is stored to the original position of the image cutting image P (N-2) stored in the cache area W,
the cut-out image P0, the cut-out images P1 and … … cut-out images P (N-2) and the cut-out images P (N-1) are spliced to obtain a cut-out image P'.
The invention has the beneficial effects that:
1. in the invention, under the mutually orthogonal model of the main view angle and the side view angle, only the image cutting and picture splicing processing is carried out on the main view angle image A, the side view angle image B can acquire the coordinates of the package image on the side view angle image B according to the coordinate relation with the main view angle image A, and the image cutting is directly carried out according to the coordinates on the side view angle image B, so that the picture splicing processing and the picture splicing buffering are not needed, thereby reducing the performance loss and enhancing the real-time performance.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of a dual source dual view model;
FIG. 3 is a schematic diagram of the relationship between the corrected main view angle image A and side view angle image B;
FIG. 4 is a flow chart of the main view image A cut;
fig. 5 is a schematic diagram of saving the cut-away image in the buffer area W.
Detailed Description
In order to make the technical scheme, the technical problems to be solved and the technical effects of the invention more clear, the technical scheme of the invention is checked and fully described below with reference to the specific embodiments, and obviously, the described embodiments are only some embodiments of the invention, but not all embodiments. All embodiments obtained by a person skilled in the art without making any inventive effort are within the scope of the present invention based on the embodiments of the present invention.
As shown in fig. 1 and 2, according to the coordinate mapping requirement and the movement direction of the conveyor belt of the security inspection machine, a dual-source dual-view model of a main view angle and a side view angle which are orthogonal to each other is obtained, and a graph cutting method based on the coordinate mapping is as follows: first, a main view angle image a and a side view angle image B are obtained and corrected; secondly, cutting the main view angle image A to obtain a cut image P; thirdly, acquiring a required coordinate coefficient, namely extracting a coordinate T1 of a package image in the cut image P, mapping the coordinate T1 to a coordinate T2 on the main visual angle image A, and acquiring a package image coordinate T3 of the side view angle image B according to the coordinate T2; finally, the side view image B is cut based on the coordinates T3.
Example 1
As shown in fig. 2 and 3, two viewing angles perpendicular to the moving direction are taken along the moving direction of the conveyor belt, and the two viewing angles are orthogonal. In the following figures, the Z direction is the direction of movement of the conveyor belt, the X and Y directions are perpendicular to the Z direction, the X and Y directions are two views of a dual source dual view, wherein the X direction and the Y direction are perpendicular, one of the X direction and the Y direction is assumed to be a main view, and the other is assumed to be a side view. Here, the X-direction is assumed to be the main viewing angle, and the Y-direction is assumed to be the side viewing angle. After the main view angle image A and the side view angle image B are obtained, the main view angle image A and the side view angle image B are corrected, and the characteristic matrix method is adopted to correct the main view angle image A and the side view angle image B so that the main view angle image A and the side view angle image B are overlapped at one side when being perpendicular to each other, namely the lengths of the view angle image A and the side view angle image B are the same, namely w0=w1.
As shown in fig. 4, when the main view image a is cut, two areas are set for the main view, a detection area S and a recognition area X are set, the detection area S is at a fixed position, the recognition area X moves along with the conveyor belt of the security inspection machine, in fig. 4, the movement direction of the conveyor belt is from right to left, when the recognition area X coincides with the detection area S, the main view image a located in the cut area Q is cut, so as to obtain a single cut image P0, wherein the size of the cut area Q is m×n, and the sizes of the detection area S and the recognition area X are a×n.
When a completed package image is included in the single cut image, extracting the package image in the cut image P0, mapping the extracted coordinates T1 of the package image to the main view angle image A to obtain coordinates T2, obtaining coordinates T3 according to the relation between the corrected main view angle image A and the side view angle image B, and cutting the side view angle image B based on the coordinates T3.
Example two
As shown in fig. 2 and 3, two viewing angles perpendicular to the moving direction are taken along the moving direction of the conveyor belt, and the two viewing angles are orthogonal. In the following figures, the Z direction is the direction of movement of the conveyor belt, the X and Y directions are perpendicular to the Z direction, the X and Y directions are two views of a dual source dual view, wherein the X direction and the Y direction are perpendicular, one of the X direction and the Y direction is assumed to be a main view, and the other is assumed to be a side view. Here, the X-direction is assumed to be the main viewing angle, and the Y-direction is assumed to be the side viewing angle. After the main view angle image A and the side view angle image B are obtained, the main view angle image A and the side view angle image B are corrected, and the characteristic matrix method is adopted to correct the main view angle image A and the side view angle image B so that the main view angle image A and the side view angle image B are overlapped at one side when being perpendicular to each other, namely the lengths of the view angle image A and the side view angle image B are the same, namely w0=w1.
As shown in fig. 4, when the main view image a is cut, two areas are set for the main view, a detection area S and a recognition area X are set, the detection area S is at a fixed position, the recognition area X moves along with the conveyor belt of the security inspection machine, in fig. 4, the movement direction of the conveyor belt is from right to left, when the recognition area X coincides with the detection area S, the main view image a located in the cut area Q is cut, so as to obtain a single cut image P0, wherein the size of the cut area Q is m×n, and the sizes of the detection area S and the recognition area X are a×n.
When a finished package image is included under the situation that multiple image cutting and splicing are needed, multiple image cutting is carried out on the main visual angle image A to obtain a spliced image cutting P ', the spliced image cutting P' is stored in a cache area, and the maximum length of the W cache area W is L
When the primary view angle image A carries out primary image cutting, the image cutting image P0 is stored in a cache area W; when the primary view angle image A carries out secondary image cutting, a cut image P1 is obtained, the cut image P0 moves m towards one side of the motion direction of the conveyor belt of the security inspection machine, namely moves left, and the cut image P1 is placed on the rightmost side of the cache area W, namely the cut image P0 is stored in the home position of the cache area W;
when the Nth image cutting is carried out on the main visual angle image A, an image cutting image P (N-1) is obtained, the image cutting image P (N-2) moves m to one side of the motion direction of the conveyor belt of the security inspection machine, namely moves m leftwards, the image cutting image P (N-1) is stored until the image cutting image P (N-2) is stored in the original position of the buffer area W, namely the image cutting image P (N-1) is placed on the rightmost side of the buffer area W;
the cut-off image P0, the cut-off images P1 and … …, the cut-off image P (N-2) and the cut-off image P (N-1) are spliced to obtain a cut-off image P ', the length of the cut-off image P' is b, b < =l, and the dimension of P is b×n.
Extracting the package image from the cut image P', selecting the coordinates of the extracted package image, in this embodiment, the top left vertex t0 (x 0, y 0), the bottom right vertex t1 (x 1, y 1),
the distance from t0, t1 to the right edge of the cut image P' is calculated as: d0 =b-y 0, d1=b-y 1;
mapping the coordinates of the package image into a main view image A to obtain:
the upper left vertex t0', x0' =x0, y0' =w0-a-d 0
Lower right vertex t1', x1' =x1, y1' =w0-a-d 1
Since the length of the main view image a and the length of the side view image B are the same, that is, w0=w1, the side view image B can be cut in accordance with the upper left vertex (0, y0 ') and the lower right vertex (h 1, y 1'), thereby completing the cut based on the coordinate mapping relationship.
Example III
The difference between the technical scheme of the embodiment and the embodiment two is that the spliced cut image P 'includes a plurality of package images, the same parts are not repeatedly described, coordinates of the plurality of package images are extracted when the package images are extracted in the cut image P', at this time, the package image coordinates T1 are a coordinate set including the coordinates of the plurality of package images, the coordinate set is mapped into the main view angle image a, the coordinate T1 is mapped into the main view angle image a to obtain a coordinate T2, the coordinate T3 is obtained according to the relation between the corrected main view angle image a and the side view angle image B, and the cut image is performed on the side view angle image B based on the coordinate T3.
In summary, when the dual-source dual-view is based on the coordinate mapping, the image cutting and jigsaw processing is performed on the main view image a, the image cutting image P of the main view image a is cached, the coordinates of the package image in the image cutting image P are extracted and mapped on the main view image a, the coordinates of the package image on the side view image B can be obtained by the side view image B according to the coordinate relation with the main view image a, the image cutting is directly performed according to the coordinates on the side view image B, and the side view image B does not need to perform jigsaw processing and cache the jigsaw, so that the performance loss is reduced, and the real-time performance is enhanced.
The foregoing describes the principles and embodiments of the present invention in detail using specific examples, which are only for aiding in understanding the core technical content of the present invention, and are not intended to limit the scope of the present invention, but the technical solutions of the present invention are not limited to the foregoing specific embodiments. Based on the above-mentioned embodiments of the present invention, any improvements and modifications made by those skilled in the art without departing from the principles of the present invention should fall within the scope of the present invention.
Claims (8)
1. The dual-source dual-view graph cutting method based on coordinate mapping is characterized by comprising the following steps of:
s1: obtaining a main view angle image A and a side view angle image B according to the main view angle and the side view angle which are orthogonal to each other;
s2: correcting the main visual angle image A and the side visual angle image B, wherein the corrected main visual angle image A and the corrected side visual angle image B are overlapped on one side;
s3: cutting the main view angle image A to obtain a cut image P, wherein the cut image P is a single cut image P0 or a spliced cut image P';
executing S3: the main view angle is provided with a detection area S and an identification area X, a picture cutting area Q is formed between the detection area S and the identification area X at the initial position, the detection area S is fixedly arranged, the identification area X moves along with a conveyor belt of the security inspection machine, and when the identification area X coincides with the detection area S, picture cutting is carried out on a main view angle image positioned in the picture cutting area Q, so that a single picture cutting image P0 is obtained; the size of the map cutting area Q is m X n, and the sizes of the detection area S and the identification area X are a X n;
s4: extracting coordinates T1 of a package image in the cut image P;
s5: acquiring a coordinate T2, wherein the coordinate T2 is a coordinate mapped onto a main visual angle image A by the coordinate T1;
s6: acquiring a coordinate T3, wherein the coordinate T3 is a package image coordinate acquired by a side view angle image B according to the coordinate T2;
s7: the side view image B is cut based on the coordinates T3.
2. The dual source dual view coordinate mapping-based cut-out method of claim 1, further comprising the steps of:
s0: and obtaining a main view angle and a side view angle which are orthogonal to each other according to the coordinate mapping requirement and the movement direction of the conveyor belt of the security inspection machine.
3. The dual source dual view coordinate mapping-based cut-out method of claim 1, wherein when executing S1: the main view angle image A and the side view angle image B are obtained at the same time.
4. The dual source dual view coordinate mapping-based cut-out method of claim 1, wherein when executing S2: the main view angle image a and the side view angle image B are corrected based on the feature matrix method.
5. A dual source dual view coordinate mapping based cut-out method according to claim 1, wherein the identification area X is regenerated at an initial position when it coincides with the detection area S.
6. The dual-source dual-view coordinate mapping-based image cutting method according to claim 1, wherein S3 is repeatedly performed, and the main view image a is cut multiple times, so as to obtain a spliced image cutting image P'.
7. The dual source dual view coordinate mapping based cut-out method of claim 6, further comprising:
step S31: the single cut image P0 or the spliced cut image P' is saved to the buffer area W.
8. The method for dual source dual view coordinate mapping based cut-out of claim 7,
when the primary view angle image A carries out primary image cutting, the image cutting image P0 is stored in a cache area W;
when the primary visual angle image A is subjected to secondary image cutting, a cut image P1 is obtained, the cut image P0 moves m towards one side of the movement direction of the conveyor belt of the security inspection machine, the cut image P1 is stored until the cut image P0 is stored in the original position of the buffer area W,
……
when the Nth image cutting is carried out on the main visual angle image A, an image cutting image P (N-1) is obtained, the image cutting image P (N-2) moves to one side of the moving direction of the conveyor belt of the security inspection machine by m, the image cutting image P (N-1) is stored to the original position of the image cutting image P (N-2) stored in the cache area W,
the cut image P0, the cut images P1 and … … are spliced to obtain a cut image P'.
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