JP4991884B2 - Image processing apparatus and image processing method - Google Patents

Description

  The present invention relates to a technology for increasing the resolution of a video, and more particularly to an image processing apparatus and an image processing method for increasing the resolution according to the amount of information and noise of the video.

  In recent years, the fusion of PC (Personal Computer) and television has progressed, and the opportunity to view video on a high-definition display of so-called HD (High Definition) size, such as high-definition broadcasting, exceeding the SD (Standard Definition) size has increased. Yes.

  However, a video broadcast on an SD TV or a video recorded on a DVD has a low resolution, and when a user views a video of HD size (especially 1920 × 1080 so-called full HD size), The image needs to be converted to high resolution. In this regard, conventionally, image resolution has been increased by linear interpolation or cubic convolution interpolation of image pixel values, but there has been a problem that a sharp image cannot be obtained. .

  Therefore, in order to solve such a problem, the image is decompressed and at the same time, a pixel having a high frequency component is interpolated between pixels of the image generated by the decompression process to obtain a sharp high-resolution image. Research on super-resolution technology that can be performed is performed (for example, Patent Document 1 and Patent Document 2).

JP 2008-067110 A JP 2008-146190 A

  According to the super-resolution technology, the sharpness of the image is increased, so that the user can enjoy a sharp image and a clear image. However, the above-mentioned video is provided by various means such as BS (Broadcasting Satellite) broadcast, CS (Communications Satellite) broadcast, terrestrial digital broadcast, terrestrial analog broadcast, and the Internet, and the amount of information of the provided video is also large. There are a wide variety of noise levels. Therefore, when the super-resolution processing is simply applied to the video, for example, the noise included in the video provided by the CS broadcast with a small amount of information becomes conspicuous, and the clearness of the video by the super-resolution processing is remarkable. There was a problem of fading.

  Conventionally, as a method of sharpening an image, there is a sharpness process that makes the image appear sharp by raising an edge of the image. This sharpness process is sharpened according to the type of video, but it is a technology that is completely different from super resolution technology and sharpness processing in that it newly generates high frequency component pixels. There has been a problem that it is difficult to adjust the degree of sharpening by the same method as the sharpening processing performed in the sharpness processing.

  The present invention has been made in view of the above, and an object thereof is to provide an image processing apparatus and an image processing method capable of appropriately performing image conversion according to the type of video broadcast wave.

In order to solve the above-described problems and achieve the object , the image processing apparatus according to the present embodiment includes a first video signal having a first resolution and a high-frequency component inserted into a pixel of the first video signal. According to a parameter indicating the ratio of pixels, an image conversion means for converting to a second video signal having a second resolution higher than the first resolution, and according to the type of broadcast wave of the first video signal, the parameter is changed. Control means for controlling to change, and setting means for allowing the user to change the parameter that is changed according to the type of the broadcast wave.
Further, the image processing apparatus according to the present embodiment is configured such that the first video signal having the first resolution is converted into the first video signal in accordance with a parameter indicating a ratio of high frequency component pixels to be inserted with respect to the pixels of the first video signal. According to the image conversion means for converting to a second video signal having a second resolution higher than one resolution and the type of broadcast wave of the first video signal, the type of broadcast wave having a smaller transmission amount of the video signal has a higher ratio. And a control means for changing the parameter so as to be small .

In the image processing method according to the present embodiment, the image conversion means uses the first video signal having the first resolution as a parameter indicating the ratio of high-frequency component pixels to be inserted with respect to the pixels of the first video signal. In response, the image conversion step of converting the second video signal having the second resolution higher than the first resolution, and the control means change the parameter according to the type of broadcast wave of the first video signal. And a setting step in which the setting means permits the user to change the parameter that is changed according to the type of the broadcast wave.
In the image processing method according to the present embodiment, the image conversion means uses the first video signal having the first resolution as a parameter indicating the ratio of high-frequency component pixels to be inserted with respect to the pixels of the first video signal. Accordingly, the image conversion step of converting to a second video signal having a second resolution higher than the first resolution, and the control means, depending on the type of broadcast wave of the first video signal, the transmission amount of the video signal is And a control step of changing the parameter so that the ratio decreases as the number of broadcast waves decreases .

  According to the present invention, there is an effect that image conversion can be appropriately performed according to the type of video broadcast wave.

It is a block diagram which shows the structure of the image display apparatus concerning 1st Embodiment. It is a block diagram which shows the structure of the main process part shown in FIG. It is a figure which shows the example of the kind of broadcast wave displayed on a display part by operation of an operation part. It is a block diagram which shows the structure of the high resolution part shown in FIG. It is a figure which shows the example in which EEPROM memory matches and memorize | stores a super-resolution parameter and a source code. It is a flowchart which shows the execution procedure in the case of performing the super-resolution process concerning 1st Embodiment according to the kind of source code. It is a figure which shows the example of the program designation | designated screen in the case of performing super-resolution processing according to program information. It is a block diagram which shows the structure of the image display apparatus concerning 2nd Embodiment. It is a block diagram which shows the structure of the main process part shown in FIG. It is a flowchart which shows the execution procedure in the case of performing the super-resolution process concerning 1st Embodiment according to noise amount.

  Exemplary embodiments of an image processing apparatus and an image processing method according to the present invention are explained in detail below with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a block diagram schematically showing a system of the image display apparatus 100 according to the present embodiment. As shown in the figure, the image display device 100 includes a video signal input unit 11, a main processing unit 12, a resolution increasing unit 13 corresponding to the image processing device, a moving image improvement processing unit 14, and a display processing unit. 15, a display unit 16, an audio processing unit 17, and an audio output unit 18.

  The video signal input unit 11 is a part to which a video signal to be displayed is input. The video signal input unit 11 is connected to a digital broadcast receiving unit 111, an IPTV (Internet Protocol TV) signal processing unit 112, and an IP network such as the Internet. An Internet signal processing unit 113 that receives data to be transmitted and an external input unit 114 that receives an analog signal input are provided. Here, the “video signal” is a concept including an audio signal in addition to an image signal composed of a still image or a moving image.

  It should be noted that the video signal includes the type of form in which the video is provided (for example, in the case of a broadcast wave, BS broadcast, CS broadcast, terrestrial digital broadcast, terrestrial Type of broadcast wave such as analog broadcasting, bit rate of video signal, standard information of interface with playback devices and game machines of externally connected media such as DVD (High-Definition Multimedia Interface) ), For example, “1” for BS broadcast, “2” for CS broadcast, “3” for digital terrestrial broadcast, “4” for analog terrestrial broadcast, HDMI If it is the amount of information is the amount of transmission of the video signal, the number of bytes or the size of bps) is included. Note that these source codes are described in a simplified manner with the above-described numerical values, and in the following, the types of broadcast waves are described as an example.

  The digital broadcast receiver 111 includes a digital antenna 1111 for receiving digital broadcasts such as BS, CS, and terrestrial waves, a digital tuner 1112 for selecting digital broadcasts, and demodulating the digital broadcasts as digital video signals. And a digital signal demodulating unit 1113 for outputting to the main processing unit 12.

  The IPTV signal processing unit 112 receives an IP broadcast transmitted via a dedicated IP network, and outputs it to the main processing unit 12 as a digital video signal.

  The Internet signal processing unit 113 receives data (still images and moving images) transmitted via an IP network such as the Internet and outputs the data to the main processing unit 12 as a digital video signal.

  The external input unit 114 includes an analog antenna 1141 for receiving an analog broadcast, an analog tuner 1142 for selecting the analog broadcast, and performs signal processing such as A / D conversion on the analog signal to obtain a digital video signal. An external input signal processing unit 1143 for outputting to the main processing unit 12. The external input signal processing unit 1143 has a terminal (not shown) for connecting to an external device such as a game machine, a PC (Personal Computer), a DVD (Digital Versatile Disk) player, and the like, via the input terminal. Signal processing is also performed on an analog signal input from an external device.

  FIG. 2 is a block diagram illustrating a functional configuration of the main processing unit 12. As illustrated in FIG. 2, the main processing unit 12 includes an operation reception unit 121, a source determination unit 122, a control unit 123, and a flash memory 19.

  As will be described later, the operation receiving unit 121 receives a signal (hereinafter referred to as a selection signal) for selecting a broadcast wave type or the like designated from the remote controller that is the operation unit 200, and receives the selected selection signal. The corresponding source code is output to the source determination unit 122 described later.

  Specifically, as shown in FIG. 3, the user presses a channel button or the like (not shown) for switching broadcast waves on the operation unit 200, as shown in FIG. 1) is selected), and a playback screen or the like of an externally connected device (for example, a DVD player or a game machine) is selected. The operation reception unit 121 receives the selection signal output at this time and outputs the selection signal to the source determination unit 122.

  The various source codes described above are associated with super resolution parameters indicating the level of super resolution processing performed on the image signal separated from the video signal in the control unit 123, as will be described later. When the user designates the type of the source code, or as will be described later, the source determination unit 122 automatically identifies the type of the source code included in the video signal, so that the super-resolution processing corresponding to the source code is performed. Done.

  Returning to FIG. 2, upon receiving video signals from the digital signal demodulating unit 1113, the IPTV signal processing unit 112, the Internet signal processing unit 113, and the external input signal processing unit 1143, the source determination unit 122 receives sources included in the video signal. The type of code is determined, and the determined type of source code is output to the control unit 123 described later together with the video signal received from the video signal input unit 11.

  The source determination unit 122 further determines whether or not the operation reception unit 121 has received the source code specified from the operation unit 200, and determines that the source code specified from the operation unit 200 has been received. In this case, the designated source code type is output to the control unit 123 and written to the flash memory 19.

  After the source determination unit 122 determines the source code, the control unit 123 separates the video signal into an image signal and an audio signal, and outputs the image signal subjected to predetermined image processing to the high resolution unit 13. The audio signal is output to the audio processing unit 17. In addition to the image signal, an identification signal indicating the type of source code received from the source determination unit 122 is transmitted to the resolution increasing unit 13 described later.

  Here, the image processing performed by the control unit 123 includes scaling processing for converting the resolution of the input image signal into a predetermined resolution (for example, 1280 × 720).

  As described above, the flash memory 19 stores the type of source code when the operation receiving unit 121 receives a source code from the operation unit 200. Next, the resolution increasing unit 13 will be described.

  FIG. 4 is a block diagram showing a functional configuration of the resolution increasing unit 13 shown in FIG. As shown in FIG. 4, the resolution increasing unit 13 includes a preprocessing unit 131, a super resolution conversion processing unit 132, a postprocessing unit 133, and an EEPROM memory 20.

  The preprocessing unit 131 performs image processing (hereinafter referred to as preprocessing) such as interlace / progressive conversion processing and noise reduction processing for removing noise on the image signal input from the main processing unit 12. The completed video signal is output to the super-resolution conversion processing unit 132. In addition, the preprocessing unit 131 outputs the type of source code received from the main processing unit 12 to the super-resolution conversion processing unit 132 described later. The identification signal related to the source code may be input from the main processing unit 12 to the super resolution processing unit 132 without passing through the preprocessing unit 131.

  Specifically, as the interlace / progressive conversion process, the preprocessing unit 131 detects the motion of the image in the input image signal and determines a still image and a moving image. Interpolation processing is performed, and when it is determined to be a moving image, interpolation processing for the moving image is performed.

  In addition, the pre-processing unit 131 performs noise reduction processing such as image contour correction in an image signal, reduction of image blur and glare, correction for suppressing excessive equalization (high frequency emphasis), and when the camera moves in the horizontal direction. Processes such as blurring improvement.

  The super-resolution conversion processing unit 132 performs image processing (hereinafter referred to as “super-resolution conversion processing”) for increasing the resolution of the low-resolution frame input from the pre-processing unit 131, thereby obtaining a high resolution of HD size. Frame of the moving image data (hereinafter referred to as “high resolution frame”) is generated and output to the post-processing unit 133.

  Here, the super-resolution conversion processing is a sharpening that restores a high-resolution image signal that is the second resolution by estimating the original pixel value from the low-resolution image signal that is the first resolution and increasing the number of pixels. Means processing. Here, the original pixel value is, for example, an image of the same subject as that obtained when a low-resolution (first resolution) image signal is obtained with a camera having the number of pixels of the high-resolution (second resolution) image signal. It refers to the value of each pixel of the image signal that is sometimes obtained.

  Also, “estimate and increase pixels” means to capture the image features and use the image features that are correlated to estimate the original pixel value from the surrounding (within the same frame or between frames) image This means increasing the number of pixels. For the super-resolution conversion processing, it is possible to use a publicly known / public technique disclosed in Japanese Unexamined Patent Application Publication No. 2007-310837, Japanese Unexamined Patent Application Publication No. 2008-98803, Japanese Unexamined Patent Application Publication No. 2000-188680, and the like. As a technique for the super-resolution conversion processing of the present embodiment, for example, a technique for restoring an image having a frequency component higher than the Nyquist frequency determined by the sampling period of the input image is used.

  For example, when using the super-resolution conversion process disclosed in Japanese Patent Application Laid-Open No. 2007-310837, the change pattern of the pixel value in the target image area including the target pixel in the frame for each of a plurality of medium resolution frames. Select a plurality of corresponding points corresponding to a plurality of target image areas closest to the reference frame from the reference frame, set the sample value of the luminance at the corresponding point to the pixel value of the target pixel corresponding to the corresponding point, and Calculating a pixel value of a high-resolution frame corresponding to the reference frame, which is a high-resolution frame having a number of pixels larger than the number of pixels of the reference frame, based on the size of the sample value and the arrangement of a plurality of corresponding points. Thus, the original pixel value is estimated from the low resolution image signal and the number of pixels is increased to restore the high resolution image signal.

  In addition, when using the super-resolution conversion process using self-congruent position search in the same frame image disclosed in Japanese Patent Application Laid-Open No. 2008-98803, the error of each pixel in the search area of the medium resolution frame is compared. The minimum first pixel position is calculated, and based on the first pixel position and the first error, the second pixel position around the first pixel, and the second error, The position where the error is minimized is calculated with decimal precision. Then, a decimal precision vector with this position as the end point and the target pixel as the start point is calculated, and an extrapolation vector of the decimal precision vector with the pixel on the screen not included in the search region as the end point is calculated using the decimal precision vector. calculate. Then, based on the decimal precision vector, the extrapolation vector, and the pixel value acquired from the image signal, the pixel value of the high-resolution image having a larger number of pixels than the number of pixels included in the image signal is calculated. By performing such processing, the super-resolution conversion processing unit 132 restores the high-resolution image signal by estimating the original pixel value from the low-resolution image signal and increasing the number of pixels.

  Also, a super-resolution conversion process using mapping between a plurality of frame images disclosed in Japanese Patent Laid-Open No. 2000-188680 can be used.

  However, the method of the super resolution conversion processing in the super resolution conversion processing unit 132 is not limited to the above, and a high resolution image is obtained by estimating the original pixel value from the low resolution image signal and increasing the number of pixels. Any technique can be applied as long as the process restores the signal.

  When the super-resolution conversion processing unit 132 receives the image signal after the pre-processing unit 131 performs the noise reduction processing and the identification signal indicating the type of the source code, the super-resolution conversion processing unit 132 receives the source code from the EEPROM memory 20 described later. Get the super resolution parameter corresponding to the type.

  FIG. 5 is a diagram illustrating an example of parameters stored in the EEPROM memory 20. As shown in FIG. 5, the EEPROM memory 20 stores source codes and their types, and super-resolution parameters in association with each other.

  Here, the super resolution parameter is a numerical expression of the strength of the super resolution conversion process. For example, the number of high-frequency component pixels to be inserted between pixels and the ratio of high-frequency component pixels to the pixel to be inserted is high, that is, the larger the numerical value of the super-resolution parameter, the higher the sharpening gain and the stronger the super-resolution conversion processing. This can be appropriately set according to the super-resolution processing method. The super-resolution parameter shown in FIG. 5 indicates the ratio of high-frequency component pixels inserted between pixels with respect to the total number of pixels, where 100 is the case where super-resolution processing is performed on all pixels. As described above, by storing the index for performing the super-resolution processing in the parameter format, even if the specification change occurs in the super-resolution processing standard, it is possible to easily and quickly cope with the specification change. .

  The super-resolution conversion processing unit 132 performs the above-described super-resolution processing according to the acquired super-resolution parameter, and outputs the image signal subjected to the super-resolution processing to a post-processing unit 133 described later.

  Specifically, for example, when the type of the source code received from the preprocessing unit 131 is “1” (that is, CS broadcast), the super resolution conversion processing unit 132, as shown in FIG. “10” is acquired as a parameter, and the above-described super-resolution processing is performed according to the acquired parameter.

  In the case of CS broadcasting, the value of the super resolution parameter is set to be smaller than that of BS broadcasting. The reason is that in the case of CS broadcasting, the amount of information is smaller than that of BS broadcasting, and strong super resolution processing is performed. This is because the increase in noise is large compared to the effect of sharpening the image by the super-resolution processing, and a clear video by the super-resolution processing cannot be obtained effectively. In addition, since the video signal provided from an externally connected device has less noise than the video signal provided by broadcast wave communication, the value of the super-resolution parameter is set small. As described above, the super-resolution parameter shown in FIG. 5 is set according to the type of broadcast wave, that is, the amount of information. Note that the above-described super-resolution parameter value can be arbitrarily set by the user. Subsequently, the post-processing unit 133 will be described.

  The post-processing unit 133 performs image correction processing (hereinafter referred to as post-processing) such as gamma correction and white balance adjustment on the image signal input from the super-resolution conversion processing unit 132, and causes the moving image improvement processing unit 14 to perform image correction processing. Output. Next, returning to FIG. 1, the moving image improvement processing unit 14 will be described.

  The moving image improvement processing unit 14 performs double speed processing on the image signal received from the post-processing unit 133. Specifically, by performing processing to convert the frame rate of a video signal transmitted at 60 fps (Frame Per Second) to 120 fps, video blurring in moving parts such as horizontal, vertical, diagonal directions and rotating subjects is reduced. In addition, noise is also effectively suppressed, and flowing telop and fast-moving sports scenes are clearly displayed. The frame rate converted image signal is output to the display processing unit 15.

  As a method of interpolation processing, interpolation is performed in accordance with a generally performed frame image interpolation method such as an interpolation generation processing method based on motion vector detection by a block matching method described in Japanese Patent Application Laid-Open No. 2008-35404. It is also possible to generate and interpolate frame images. Furthermore, the number of interpolated frame images can be arbitrarily determined.

  The display processing unit 15 includes a driver or the like for outputting an image signal to the display unit 16, and causes the display unit 16 to display the image signal received from the moving image improvement processing unit 14.

  The display unit 16 includes a display such as an LCD (Liquid Crystal Display), a plasma panel, and an SED (Surface-conduction Electron-emitter Display) panel, and displays an image signal controlled by the display processing unit 15.

  The operation unit 200 includes a remote operation device such as a remote controller, and transmits a selection signal to the main processing unit 12 when the user presses a channel selection button (not shown).

  Subsequently, an execution process performed in the above-described image display apparatus 100 will be described.

  FIG. 6 is a flowchart illustrating a processing procedure when the image display apparatus 100 receives a video signal and performs super-resolution conversion processing according to the type of broadcast wave or the like.

  As shown in the figure, the source determination unit 122 of the main processing unit 12 determines whether or not the operation reception unit 121 has received a selection signal from the operation unit 200 (step S601).

  When the source determination unit 122 determines that the operation reception unit 121 has received the selection signal from the operation unit 200 (step S601; Yes), the source determination unit 122 acquires the source code corresponding to the selection signal and stores it in the flash memory 19. Store (step S602).

  On the other hand, when the operation reception unit 121 determines that the selection signal is not received from the operation unit 200 (step S601; No), the source code included in the image signal is acquired (step S603).

  Thereafter, the source determination unit 122 transmits the image signal to the high resolution unit 13 together with the source code acquired in step S602 or step S603 (step S604).

  When the preprocessing unit 131 of the resolution increasing unit 13 receives the image signal from the source determination unit 122, the preprocessing unit 131 performs image processing such as interlace / progressive conversion processing and noise reduction processing, along with the source code received from the main processing unit 12. The image signal is output to the super resolution conversion processing unit 132 (step S605).

  Upon receiving the source code and the image signal from the preprocessing unit 131, the super resolution conversion processing unit 132 acquires the super resolution parameter corresponding to the received source code from the EEPROM 20 (step S606).

  Then, the super resolution conversion processing unit 132 performs super resolution processing on the image signal in accordance with the acquired value of the super resolution parameter (step S607). Thereafter, the super-resolution conversion processing unit 132 outputs the image signal subjected to the super-resolution processing to the post-processing unit 133, and the post-processing unit 133 performs correction processing such as gamma correction and outputs it to the moving image improvement processing unit 14. (Step S608). Thereafter, the image signal is displayed on the display unit 16 via the display processing unit 15.

  As described above, the source determination unit 122 of the main processing unit 12 determines the amount of the information amount of the video, determines the level of the super resolution processing according to the determined type, and then converts the video to the super resolution. Therefore, the super-resolution processing can be appropriately performed.

  In the above-described embodiment, the super resolution parameter is acquired as the information amount of the provided video signal according to the type of broadcast wave designated by the user from the operation unit 200. For example, a program as shown in FIG. It is also possible to select a program from the information and acquire the super-resolution parameter according to the genre information of the program (for example, movies, sports, etc.). In this case, program information including genre information is transmitted by being superimposed on a broadcast signal from a broadcast station.

(Second Embodiment)
In the first embodiment described above, according to the amount of information of the video signal received from the outside, for example, the type of broadcast wave has been described as an example. However, depending on the type of broadcast wave received, the broadcast wave The amount of noise contained in also changes. In such a case, even if the amount of noise is large, if the super-resolution conversion process is applied strongly, the noise may be conspicuous. Accordingly, a case will be described in which super-resolution conversion processing is performed in accordance with the amount of noise included in the video signal instead of the amount of information such as the type of broadcast wave.

  FIG. 8 is a block diagram showing a configuration of the main processing unit 82 of the image display device (not shown) according to the second embodiment. The main processing unit 82 of the image display apparatus 200 according to the second embodiment includes a noise amount detection unit 822 in place of the source determination unit 122, and the main processing unit 12 according to the first embodiment. Is different. In the following description, the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  When receiving a video signal from the digital signal demodulating unit 1113, the IPTV signal processing unit 112, the Internet signal processing unit 113, and the external input signal processing unit 1143, the noise amount detection unit 822 detects the amount of noise included in the video signal. The detected noise amount is output to the control unit 123 described later together with the video signal received from the video signal input unit 11. Thereafter, the video signal and the amount of noise are output via the control unit 123. Then, as shown in FIG. 9, the super resolution conversion processing unit 132 acquires the super resolution parameter stored in the EEPROM 20 in association with the noise amount, and performs the super resolution process according to the acquired super resolution parameter. Thereafter, similar to the first embodiment, each process such as post-processing and moving image improvement is performed.

  As shown in FIG. 9, the noise amount and the super-resolution parameter are associated with each other so that the higher the noise amount, the weaker the super-resolution, and the smaller the noise amount, the stronger the super-resolution. This is because when the amount of noise is large, the noise becomes conspicuous as compared with the sharpening of the image by the super-resolution conversion process, and the noise amount and the super-resolution parameter are stored according to the above-described correspondence relationship. Thus, the super-resolution conversion process can be appropriately performed according to the amount of noise.

  Even if a video signal with a large amount of noise is received, the noise amount is sufficiently removed by noise reduction processing, the amount of noise in the video signal after the removal is detected, and super-resolution processing is strongly applied. It is also possible.

  Subsequently, an execution process performed by the image display apparatus 200 according to the second embodiment will be described with reference to FIG. In addition, the description is abbreviate | omitted about the same process content as the process concerning 1st Embodiment.

  First, the noise amount detection unit 822 detects the noise amount of the received image signal (step S1001), and transmits the received image signal and noise amount to the high resolution unit 13 (step S1002). As described above, the amount of noise may be detected after the noise reduction process.

  When the preprocessing unit 131 of the resolution increasing unit 13 receives the image signal from the source determining unit 122, the preprocessing unit 131 performs image processing such as interlace / progressive conversion processing, and the super-resolution of the noise amount and image signal received from the main processing unit 12 is performed. The data is output to the conversion processing unit 132 (step S1003).

  Upon receiving the noise amount and the image signal from the preprocessing unit 131, the super resolution conversion processing unit 132 acquires a super resolution parameter corresponding to the received noise amount from the EEPROM 20 (step S1004).

  Then, the super resolution conversion processing unit 132 performs super resolution processing on the image signal according to the acquired value of the super resolution parameter (step S1005). Thereafter, post-processing is performed in the same manner as in the first embodiment (step S1006). Thereafter, the image signal is displayed on the display unit 16 via the display processing unit 15.

  As described above, the noise amount detection 822 of the main processing unit 12 detects the noise amount of the video signal, determines the level of the super-resolution processing according to the amount of the detected noise amount, and converts the video to the super-resolution. Therefore, the super-resolution processing can be appropriately performed on the video.

  It should be noted that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  For example, instead of the source determination unit 122 and the noise amount detection unit 822, a terminal detection unit that detects the type of external input terminal (D terminal, HDMI terminal, analog terminal, etc.) to which a video signal is input is provided, and the detection result The degree of super-resolution processing may be changed according to the above.

  Furthermore, instead of the source determination unit 122 and the noise amount detection unit 822, a resolution detection unit that detects the resolution of the input video signal as an information amount may be provided, and the degree of super-resolution processing may be changed according to the detection result. Is possible. In this case, it is assumed that the resolution information is included in the broadcast signal, for example. Thus, in the present embodiment, the degree of super-resolution processing can be changed based on the difference in input source in a broad sense, such as the information amount, noise amount, and terminal type.

  In this embodiment, an example in which the image processing apparatus of the present invention is applied to an image display apparatus 100 such as a digital TV having a display unit 16, a display processing unit 15, an audio output unit 18, and an audio processing unit 17 is given. As described above, the image processing apparatus of the present invention can be applied to, for example, a tuner, a set top box, or the like that does not include the display unit 16, the display processing unit 15, the audio output unit 18, and the audio processing unit 17. .

  As described above, the image processing apparatus and the image processing method according to the present invention are useful for increasing the resolution of a video, and are particularly suitable for a technique for performing super-resolution processing in accordance with the amount of video information and the amount of noise. ing.

DESCRIPTION OF SYMBOLS 100 Image display apparatus 11 Video signal input part 12 Main processing part 13 High resolution part 14 Movie improvement processing part 15 Display processing part 16 Display part 17 Audio | voice processing part 18 Audio | voice output part 19 Flash memory 20 EEPROM memory 111 Digital broadcast receiving part 112 IPTV signal processing unit 113 Internet signal processing unit 114 External input unit 121 Operation receiving unit 122 Source determination unit 123 Control unit 131 Preprocessing unit 132 Super-resolution conversion processing unit 133 Post processing unit 200 Operation unit (remote controller)
1111 Digital antenna 1112 Digital tuner 1113 Digital signal demodulator 1141 Analog antenna 1142 Analog tuner 1143 External input signal processor

Claims (8)

A second video having a second resolution higher than the first resolution in accordance with a parameter indicating a ratio of high-frequency component pixels inserted into the first video signal with respect to the first video signal. Image conversion means for converting to a signal;
Control means for controlling to change the parameter according to the type of broadcast wave of the first video signal;
Setting means for allowing a user to change the parameter that is changed according to the type of the broadcast wave;
An image processing apparatus comprising: A second video having a second resolution higher than the first resolution in accordance with a parameter indicating a ratio of high-frequency component pixels inserted into the first video signal with respect to the first video signal. Image conversion means for converting to a signal;
  Control means for changing the parameter so that the ratio decreases as the type of broadcast wave with a smaller transmission amount of the video signal according to the type of broadcast wave of the first video signal;
  An image processing apparatus comprising: It further comprises a designation accepting means for accepting designation of the type of broadcast wave by a user operation,
The control means performs control to change the parameter according to the type of the specified broadcast wave;
The image processing apparatus according to claim 1, wherein: The image converting means, the image processing apparatus according to any one of claims 1 to 3, characterized in that converting the higher than the first resolution a second resolution of the video signal by using a super-resolution technique . The type of the broadcast wave includes BS broadcast, CS broadcast, terrestrial digital broadcast, terrestrial analog broadcast,
The image processing apparatus according to any one of claims 1 to 4, characterized in. Display means for displaying an image of the second video signal;
The image processing apparatus according to any one of claims 1 to 5, further comprising a. The image converting means converts the first video signal having the first resolution to a second higher than the first resolution in accordance with a parameter indicating a ratio of high-frequency component pixels to be inserted with respect to the pixels of the first video signal. An image conversion step of converting into a second video signal of resolution;
A control step for controlling the parameter to change according to the type of broadcast wave of the first video signal;
A setting step for allowing the user to change the parameter that is changed according to the type of the broadcast wave;
An image processing method comprising: The image converting means converts the first video signal having the first resolution to a second higher than the first resolution in accordance with a parameter indicating a ratio of high-frequency component pixels to be inserted with respect to the pixels of the first video signal. An image conversion step of converting into a second video signal of resolution;
  A control step, wherein the control means changes the parameter according to the type of broadcast wave of the first video signal so that the ratio becomes smaller as the type of broadcast wave with a smaller transmission amount of the video signal;
  An image processing method comprising:

Images