JP2010200112A - Video sharpening processing unit, video device including video sharpening processing function, and method of sharpening video - Google Patents

Abstract

A gap between input video and display performance of a video display device is filled.
An input video signal is received in a predetermined signal format in which a pseudo high resolution video signal obtained by up-converting relatively low resolution video content and a high resolution video signal including originally high resolution video content can be mixed. A frequency state determination unit (104) for determining a frequency state (histogram) of video content included in the signal, and a frequency state determination unit for extracting a signal component used for video sharpening processing from the input video signal; A sharpening band filter (108) whose frequency response characteristic changes according to the frequency state determination result by the signal, and a sharpening process for performing a sharpening process on the input video signal using a signal component extracted from the sharpening band filter The processing unit (110) is provided. When the frequency state determination unit determines that the high frequency component of the input video signal is relatively small, the frequency response characteristic of the sharpening band filter is adjusted so that the high frequency response decreases relatively Is done.
[Selection] Figure 1

Description

  The present invention relates to an image sharpening process.

  Standard definition video such as DVD video (Standard Definition: SD video: 480 x 480 to 720 x 480 dots) or quasi-high resolution video (1440 x 1080 dots) such as terrestrial digital broadcasts is displayed as high resolution video (Full HD: Full HD) A technique for up-conversion to video: 1920 × 1080 dots has been proposed (see Patent Document 1).

JP 2008-67110 A

  Due to the practical use of video up-conversion, HD video signals can be mixed with SD video up-converted into HD signal format in addition to the original full HD video signal. However, a video display device that receives the HD video signal processes as an HD video regardless of the content if the input signal form is an HD signal. The video display device can display a high-definition video when an original full HD video signal is input (originally a high-resolution video can be displayed without a sharpening process). However, when an originally low-resolution video signal is input in the HD signal format, such as a simple up-conversion of the SD video into the HD signal format, the video display device does not perform an appropriate sharpening process on the input video. , The video may be blurred and blurred.

  In other words, in a video display device capable of full HD video display that handles input video (SD video content and HD video content are randomly mixed) adopting an HD signal form, a gap may occur between the display performance and the input video. . Then, the device user may be allowed to view the SD quality video even though the HD signal is viewed on a full HD video display device (such as a high-definition TV).

  One of the problems of the present invention is to realize the optimization of the input video so as to fill the gap between the input video and the display performance of the video display device.

  A sharpening processing apparatus according to an embodiment of the present invention is a predetermined processing in which a pseudo high resolution video signal obtained by up-converting relatively low resolution video content and a high resolution video signal including originally high resolution video content can be mixed. A frequency state determination unit (104) that receives an input video signal in a signal format (HD signal format) and determines a frequency state (histogram in units of frames) of video content included in the input video signal; A signal component used for image sharpening processing is extracted, and a sharpening band filter (108) whose frequency response characteristic changes according to a frequency state determination result by the frequency state determination unit, and a sharpening band filter A sharpening processor (110) that performs a sharpening process on the input video signal using the extracted signal component. Comprising a.

  In the sharpening processing device, when the frequency state determination unit determines that the high frequency component of the input video signal is relatively small, the high frequency response of the sharpening band filter is relatively decreased. In addition, the frequency response characteristic of the sharpening band filter is adjusted.

  Specifically, in one embodiment of the present invention, when it is determined that the high frequency component of the input video signal is relatively small, the high frequency cutoff frequency of the sharpening band filter is lowered to increase the high frequency Suppresses noise (improves sharpening coring level), and prevents sharp images (no gains from sharpening effects) even if sharpening processing (improves sharpening gain).

  According to the present invention, when a sharpening process is performed on an input video that is actually a low resolution like an HD video signal obtained by up-converting an SD video but is apparently recognized as a high resolution signal from the signal specifications. It can prevent a noisy image. In this way, optimization of the input video is realized.

The block diagram explaining the sharpening processing apparatus of the image | video based on one embodiment of this invention. The figure explaining the structure of a histogram acquisition / frequency state determination part. The figure which illustrates the variable filter characteristic of a sharpening band filter. The figure explaining the specific example of the sharpening process of an image | video. The figure explaining the specific example of the sharpening band filter and the sharpening addition process part. The flowchart figure explaining an example of the sharpening process sequence of an image | video.

  Hereinafter, various embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram for explaining an image sharpening processing apparatus 120 according to an embodiment of the present invention. The video source 100 of the video signal input to the sharpening processor 120 includes a digital TV tuner output, a digital broadcast program recorded on a TV built-in hard disk (HDD), and a playback signal (digital video signal) from a DVD player / DVD recorder. )and so on. This video signal includes a luminance signal (Y) 101, a color difference blue signal (Cb / Pb) 102, and a color difference red signal (Cr / Pr) 103 (in some cases, it may be a red, green, and blue RGB signal). . Here, it is assumed that the video signals 101 to 103 are digital signals. When the video signals 101 to 103 are analog signals, they are converted into digital signals using an A / D converter (not shown).

  The video signals 101 to 103 are temporarily stored in the frame memory 124. In addition, a histogram indicating a frequency band distribution is acquired for each frame with respect to at least the luminance signal (Y) 101 among the video signals 101 to 103. This histogram acquisition is performed in the histogram acquisition / frequency state determination unit 104 (details will be described later with reference to FIG. 2).

  The histogram acquisition / frequency state determination unit 104 determines the frequency state of the input luminance signal (Y) from the acquired histogram (how the signal is distributed from low frequency components to high frequency components) in units of frames. Checked. From this check result, the histogram acquisition / frequency state determination unit 104 determines in real time whether the high frequency component is relatively small or high relative to the low frequency component.

  When the determination result by the histogram acquisition / frequency state determination unit 104 is output, the video signals 101 to 103 stored in the frame memory 124 are read as corresponding signals 101 * to 103 * (the frame memory 124 is a kind of delay). Functions as a device). The read signals 101 * to 103 * are input to the sharpening band filter 108 and the sharpening addition processing unit 110 in the sharpening processing block 107.

  The histogram acquisition / frequency state determination unit 104 determines whether the high frequency component is relatively small or large with respect to the low frequency component, and the state determination data (control parameter) 105 is sharpened as a result of the determination. To supply. The state determination data (control parameter) 105 is a control signal (a minute signal coring control signal) for the sharpening band filter 108 that extracts a video signal component for sharpening.

  Further, the histogram acquisition / frequency state determination unit 104 supplies state determination data (control parameter) 106 to the adder 111 as the determination result as to whether the high frequency component is relatively small or large with respect to the low frequency component. . The state determination data (control parameter) 106 is a control signal (effect gain control signal) for determining the sharpening effect. The adder 111 is given an initial parameter (standard setting value by the apparatus manufacturer or user setting value determined by the user according to preference) that determines the degree of sharpening. The adder 111 supplies the sharpening effect gain control signal 112 obtained by adding the initial parameter to the state determination data (control parameter) 106 to the sharpening addition processing unit 110.

  A sharpening processing block 107 composed of the sharpening band filter 108 and the sharpening addition processing unit 110 performs a sharpening process on the signals 101 * to 103 * read from the frame memory 124 in units of frames (this The content of the sharpening process changes as the picture in the frame changes.) The luminance signal (Y *) 121, the color difference blue signal (Cb * / Pb *) 122, and the color difference red signal (Cr * / Pr *) 123, which are appropriately sharpened by the sharpening processing block 107, are, for example, a high signal compatible with full HD. It is supplied to the video display unit 130 having a resolution flat display panel. These signals 121 to 123 can also be output to the outside via the HDMI terminal 140 and the D terminal (D3 to D5 terminal) 150 that can handle a full HD signal.

  A sharpening band filter 108 in the sharpening processing block 107 extracts an AC signal component for performing sharpening processing from the input video signal. An example of the filter band design at that time will be described with reference to FIGS.

  FIG. 2 is a diagram illustrating the configuration of the histogram acquisition / frequency state determination unit 104. Among the video signals input to the sharpening processing block 107, the luminance signal (Y) 101 is input to n band-pass filters BPF1 to BPFn and one high-pass filter HPF in units of frames. Here, the HPF passes a fine video signal component (a component having a particularly high spatial frequency) that does not appear frequently unless it is a full HD signal. The BPF 1 selectively passes a video signal component (a component having a low spatial frequency) with little change among SD video and HD video. The BPFn selectively allows a video signal component (a component having a high spatial frequency) having a large change among SD video and HD video to pass therethrough. BPF2 to BPF (n-1) selectively pass video signal components between a case where the change is small and a case where the change is large, divided into a plurality of frequency sections. By using these BPF1 to BPFn and HPF, an intra-frame information distribution (histogram) of the input video can be acquired.

  That is, in one digital video frame (for example, a frame corresponding to 1920 × 1080 pixels), the frequency of occurrence of pixels corresponding to signal components passing through the BPF 1 (the cumulative number of pixels used for displaying a large area image) To the occurrence frequency of pixels corresponding to signal components passing through BPFn (the cumulative number of pixels used for displaying an image of a small area) and the occurrence frequency of pixels corresponding to signal components passing through HPF (very small). A histogram of the cumulative number of pixels used to display the area image is obtained by accumulating and storing the outputs of BPF1 to BPFn and HPF. This cumulative storage is performed in the registers 1041 to 104n and 104h.

  The register 1041 stores a value obtained by multiplying the cumulative number of pixels corresponding to the pass band of the BPF 1 by a predetermined weighting coefficient. The register 1042 stores a value obtained by multiplying the cumulative number of pixels corresponding to the pass band of the BPF 2 by a predetermined weighting coefficient. Similarly, the register 104n stores a value obtained by multiplying the cumulative number of pixels corresponding to the pass band of BPFn by a predetermined weighting coefficient. The register 104h stores a value obtained by multiplying the cumulative number of pixels corresponding to the HPF pass band by a predetermined weighting coefficient. Note that how to select the weighting coefficient in each register is experimentally determined on a case-by-case basis depending on the video content to be sharpened (movie film video, studio video video, CG animation video, or the like).

  The accumulated number of pixels stored in the registers 1041 to 104n is added by the adder 104a, and the result of the addition is input as the reference data A to the comparator 104c. On the other hand, the cumulative number of pixels stored in the register 104h is input as comparison data B to the comparator 104c. The comparator 104c determines whether the comparison data B input from the register 104h is large or small based on the reference data A input from the adder 104a (this size determination is a weighting in the registers 1041 to 104n and 104h). Affected by the degree of).

  In the simplest case, the comparator 104c is a binary comparator, but in this embodiment, the comparator 104c is composed of a multi-level comparator that outputs a multi-value according to the degree of difference in the size of the data A and the data B. Is done. The multilevel output of the multilevel comparator is used as state determination data (sharpening coring adjustment parameter) 105 and state determination data (sharpening effect gain parameter) 106.

  FIG. 3 is a diagram illustrating the variable filter characteristic of the sharpening band filter 108. The variable filter 108 has a plurality of filter characteristics (a plurality of low-pass filters having different cutoff frequencies). Which filter characteristic is selected is determined by the value of the state determination data (sharpening coring adjustment parameter) 105.

  That is, when there are few fine video components in the currently checked video frame (FIG. 4A), it is determined that there is little pixel information to be sharpened on the high frequency side and that it is almost noisy. In this case, state determination data (sharpening coring adjustment parameter) 105 so that the suppression level of high-frequency noise is increased, that is, the high-frequency response of the filter 108 is relatively lowered (lower side in FIG. 3). The value of is set. As described above, if the “high frequency component having almost no noise” is suppressed, even if the sharpening effect gain is increased by the state determination data (sharpening effect gain parameter) 106 to improve the sharpness of the low-resolution video, This can prevent a noisy video.

  On the other hand, when there are many fine video components in the currently checked video frame (FIG. 4B), the state is such that the high-frequency response of the filter 108 is relatively increased (upper side in FIG. 3). A value of determination data (sharpening coring adjustment parameter) 105 is set. In this way, if “high-frequency components with a lot of fine video components” are passed through, even if the sharpening effect gain is lowered by the state determination data (sharpening effect gain parameter) 106, there are originally many fine video components. The fineness of the image is not impaired. In addition, since the sharpening effect gain is lowered, an increase in noise accompanying sharpening can be avoided.

  Note that when the high frequency information (fine video component) in the frame of the currently checked video is between a few and many cases, the frequency response of the filter 108 includes the response curve of FIG. The one between the upper and lower curves is selected.

  FIG. 4 is a diagram for explaining a specific example of the image sharpening process. In the comparator 104c of FIG. 2, when the comparison data B (corresponding to the high-frequency component) is smaller than the reference data A (corresponding to the low-frequency component) (case 1), it is fine in the frame of the currently checked image. There are few (or no) video components (FIG. 4 (a)). In this case, it is determined that the currently checked video is a “pseudo HD video obtained by upconverting an SD video”, and state determination data (sharpening coring adjustment parameter) 105 and state determination data (sharpening effect gain parameter). ) 106 has a value indicating “pseudo HD video obtained by up-converting SD video” (see the left side of FIGS. 4C and 4D).

  On the other hand, when the comparison data B (corresponding to the high frequency component) is equal to or higher than the reference data A (corresponding to the low frequency component) (case 2), there are many fine video components in the frame of the currently checked image. (FIG. 4B). In this case, it is determined that the currently checked video is “original full HD video”, and the status determination data (sharpening coring adjustment parameter) 105 and the status determination data (sharpening effect gain parameter) 106 are “ A value indicating “original full HD video” is set (see the right side of FIGS. 4C and 4D).

  Further, when the comparison data B (corresponding to the high frequency component) is equal to or less than the reference data A (corresponding to the low frequency component) but the degree is between the case 1 and the case 2 (case 3), the state determination The data 105 and 106 have values indicating the case of “pseudo HD video obtained by up-converting SD video” and “original full HD video” (in FIGS. 4C and 4D, (See between threshold value TH1 and threshold value TH2).

  FIG. 5 is a diagram illustrating a specific example of the sharpening band filter 108 and the sharpening addition processing unit 110. The luminance signal (Y) 101 * read from the frame memory 124 is input to an adder 1103y and a low-pass filter LPF (Y) 108y that can be cut off. The color difference signal (Cb / Pb) 102 * read out from the frame memory 124 is input to an adder 1103b and a variable low-pass filter LPF (Cb / Pb) 108b. The color difference signal (Cr / Pr) 103 * read out from the frame memory 124 is input to an adder 1103r and a variable low-pass filter LPF (Cr / Pr) 108r.

  LPF (Y) 108y, LPF (Cb / Pb) 108b, and LPF (Cb / Pb) 108b all have frequency responses according to the values of state determination data (sharpening coring adjustment parameters) 105y, 105b, and 105r. The characteristic changes and the cutoff frequency moves (see FIG. 3). Note that the filters 108y, 108b, and 108r may be bandpass filters whose passbands change according to the values of the state determination data 105y, 105b, and 105r.

  The output 109y of the LPF (Y) 108y, the output 109b of the LPF (Cb / Pb) 108b, and the output 109r of the LPF (Cb / Pb) 108b are variable via secondary differential circuits 1101y, 1101b, and 1101r, respectively. Input to the gain amplifiers 1102y, 1102b, and 1102r. Secondary differentiation circuits 1101y, 1101b, and 1101r cut unnecessary low-frequency components of the input video signal, extract high-frequency components of the input video signal, and sharpen image edges. The level of the sharpening signal whose edges are sharpened by these secondary differentiation circuits is appropriately adjusted by the variable gain amplifiers 1102y, 1102b, and 1102r. The gains of the variable gain amplifiers 1102y, 1102b, and 1102r are determined by the sharpening effect gain control signals 112y, 112b, and 112r, respectively. Here, the sharpening effect gain control signals 112y, 112b, and 112r are added to predetermined initial parameters in state determination data (sharpening effect gain parameters) 106y, 106b, and 106r in adders 111y, 111b, and 111r, respectively. Can be obtained by adding

  The sharpening signals level-adjusted by the sharpening effect gain control signals 112y, 112b, and 112r are added to the original signals 101 *, 102 *, and 103 * in the adders 1103y, 1103b, and 1103r, and sharpened. Signals 121, 122, and 123 with improved feeling are output.

  FIG. 6 is a flowchart for explaining an example of a video sharpening processing procedure. When a video signal for one frame is input to the sharpening processing device 120 in FIG. 1 (ST10), a histogram for each frequency component is detected from the video information for one frame (ST12). It is checked from the detected histogram whether the high frequency component is relatively less than the low frequency component (ST14).

  When the high-frequency component is relatively less than the low-frequency component (ST14Y), the effect gain is increased to improve the sharpness (resolution) (left side in FIG. 4C), but the screen becomes noisy as it is. Become. Therefore, the noise suppression level is increased by changing the state determination data (sharpening coring adjustment parameter) 105 (adjusting the filter 108 in the high-frequency attenuation direction) (ST16). Alternatively, when the high frequency component is small (ST14Y), the pass band of the filter 108 is shifted to the lower peak frequency component of the detected histogram (left side in FIG. 4A).

  When the high frequency component is relatively larger than the low frequency component (ST14N), the effect gain is increased to improve the sharpness (resolution) and the necessity is low (right side of FIG. 4 (c)). In that case, if the coring is applied too much and the filter 108 does not pass the high-frequency component, the sharpness (resolution) may be insufficient. Therefore, when there are many high frequency components (ST14N), the state determination data (sharpening coring adjustment parameter) 105 is changed (by adjusting the filter 108 in the high frequency increasing direction) to ensure the high frequency information amount (ST18). ). Alternatively, when there are many high frequency components (ST14N), the pass band of the filter 108 is shifted to the higher peak frequency component of the detected histogram (right side in FIG. 4B).

  Then, using the output of the filter 108 whose frequency response characteristics are determined according to the intra-frame frequency distribution of the input video signal, the sharpening addition processing unit 110 performs the sharpening addition processing on the input video signal in units of frames. Performed (ST20). The video signal processed in this way is output from the sharpening processing device 120 of FIG. 1 (ST22). The above processing (ST10 to ST22) is automatically executed in the sharpening processing device 120.

  The video signal output from the sharpening processing device 120 is displayed on, for example, the video display unit 130 in FIG. If the device user who is viewing the displayed video wants to “make a sharp picture one more time” (ST24Y), the initial parameter input to the adder 111 in FIG. 1 is added (direction in which the sharpening effect gain increases). ) To increase sharpness (ST26). On the other hand, if the device user who is viewing the displayed video thinks “It is a slightly unnaturally sharp picture” (ST28Y), the initial parameter input to the adder 111 in FIG. 1 is negative (sharpened). The sharpness can be suppressed by changing the effect gain to a smaller direction (ST30). With these initial parameters, basic settings that are not influenced by the frequency band components of the input video can be made. The above processing (ST24 to ST30) can be performed manually by the apparatus user.

  The process of FIG. 6 is repeatedly executed continuously. Therefore, automatic adjustment of the sharpness (resolution feeling) according to the content of the displayed video (which can change from frame to frame) is performed in real time on a frame basis with reference to a picture manually set by the user.

  Note that the super-resolution video generated by the “super-resolution image generating device” of Japanese Patent Application Laid-Open No. 2008-67110 can be input to the sharpening processing device 120 in FIG. Alternatively, the super-resolution processing (see FIGS. 4, 5, and paragraphs 0020, 0051, etc.) of Japanese Patent Application Laid-Open No. 2008-67110 is performed on the video signal that has been sharpened by the sharpening processor 120 of FIG. It can also be applied.

  Alternatively, the “super-resolution image generation device” disclosed in Japanese Patent Application Laid-Open No. 2008-67110 may be applied to the sharpening processing device 120 itself of FIG. 1, and the degree of super-resolution processing may be variably controlled by the state determination data 105 and 106. Is possible. That is, the sharpening process performed by the sharpening apparatus 120 in FIG. 1 is not limited to a simple edge enhancement process.

<Effect of Embodiment>
Since the sharpening effect is controlled in units of frames while checking the histogram of the frequency distribution of the video in units of frames, the sharpening effect characteristics can be reflected in detail in real time in the input video.

  In other words, it is possible to detect the characteristics of the input video signal by acquiring the frequency band information of the input video signal in real time, and to perform the optimum sharpening process based on the detection result.

<Correspondence Example between Embodiment and Invention>
(1) High-resolution video including a pseudo-high-resolution video signal obtained by up-converting video content (SD content) having a first resolution and video content (full HD content) having a second resolution higher than the first resolution. A determination unit (104) for determining which of the signals is input;
A sharpening processing block (107) for sharpening at least one of the pseudo high-resolution video signal (up-convert HD) or the high-resolution video signal (full HD);
The sharpening processing block (107) determines the degree of sharpening processing for the pseudo high resolution video signal and the sharpening for the high resolution video signal according to the determination results (105, 106) of the determination unit (104). A video apparatus configured to change at least one of the degrees of processing.

(2) A predetermined signal format in which a pseudo high resolution video signal obtained by up-converting relatively low resolution video content (SD content) and a high resolution video signal including originally high resolution video content (full HD content) can be mixed ( HD video format) input video signals (101 to 103) are received (ST10),
Detecting a frequency state (histogram) of video content included in the input video signal (ST12);
When it is determined that the high-frequency component of the input video signal is relatively small (in the case of a pseudo HD video obtained by up-converting SD video) (ST14Y), a signal used for video sharpening processing in the input video signal The high frequency response of the component (109) is relatively lowered (lower side in FIG. 3) (in FIG. 4d, the noise suppression level is increased) (ST16),
When the frequency state determination unit (104) determines that the high frequency component of the input video signal is relatively large (in the case of the original full HD video) (ST14N), the sharpness of the video in the input video signal is determined. The high frequency response of the signal component (109) used for the conversion processing is relatively increased (lower side in FIG. 3) (noise suppression level is decreased in FIG. 4d) (ST18),
The sharpening processing method is performed on the input video signal using the signal component used for the sharpening processing (in FIG. 4c, the sharpening effect gain is increased or decreased between threshold value 1 and threshold value 2) (ST20).

  In addition, this invention is not limited to embodiment mentioned above, In the implementation stage, it can change variously in the range which does not deviate from the summary. For example, the determination result may be extracted from the histogram acquisition / frequency state determination unit 104 every N frames (N is an integer), and the sharpening process in the sharpening processing block 107 may be performed every N frames of the input video. In this way, the processing for every N frames is also in the category of frame units. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

  DESCRIPTION OF SYMBOLS 100 ... Video source (TV tuner output, internal HDD reproduction output, external AV input, etc.), 104 ... Histogram acquisition / frequency state determination unit, 107 ... Sharpening processing block, 108 ... Sharpening band filter, 110 ... Sharpening addition processing (Sharpening processing unit), 124... Frame memory, 120... Image sharpening processing device, 130... Video display unit, 140... HDMI terminal, 150 ... D terminal (D3 terminal corresponding to HD signal).

Claims (11)

Receives an input video signal in a predetermined signal format that can include a pseudo high-resolution video signal obtained by up-converting relatively low-resolution video content and a high-resolution video signal originally containing high-resolution video content, and is included in this input video signal A frequency state determination unit for determining the frequency state of the video content to be recorded,
A signal component used for image sharpening processing is extracted from the input video signal, and when the frequency state determination unit determines that the high frequency component of the input video signal is relatively small, A sharpened bandpass filter that is adjusted so that the frequency response falls relatively;
A sharpening process including a sharpening processing unit that performs a sharpening process on the input video signal using a signal component extracted from the sharpening band filter and provides a sharpened video output signal apparatus.   When the frequency state determination unit determines that the high frequency component of the input video signal is relatively large, the sharpening band filter so that the high frequency response of the sharpening band filter is relatively increased. The sharpening processing apparatus according to claim 1, wherein the frequency response characteristics of the sharpening processing apparatus are adjusted. When the frequency state determination unit determines that the high frequency component of the input video signal is relatively small, the degree of sharpening processing in the sharpening processing unit is increased,
The configuration according to claim 1 or 2, wherein when the frequency state determination unit determines that the high frequency component of the input video signal is relatively large, the degree of the sharpening processing in the sharpening processing unit is weakened. The sharpening processing apparatus as described. When the frequency state determination unit determines that the high frequency component of the input video signal is relatively small, the degree of sharpening processing in the sharpening processing unit is increased to a first threshold,
When the frequency state determination unit determines that the high frequency component of the input video signal is relatively large, the degree of sharpening processing in the sharpening processing unit is reduced to a second threshold,
When the frequency state determination unit determines that the high frequency component of the input video signal is relatively small or not, the degree of sharpening processing in the sharpening processing unit is set to the first threshold value and the first threshold value. The sharpening processing apparatus according to claim 1, wherein the sharpening processing apparatus is configured to adjust between the second threshold values. When the frequency state determination unit determines that the high-frequency component of the input video signal is relatively small, the sharpening processing unit increases the degree of sharpening processing and the high-frequency of the sharpening band filter By setting the signal component that gives the effect of the sharpening process by the relative drop of the response,
When the frequency state determination unit determines that the high frequency component of the input video signal is relatively large, the degree of the sharpening processing in the sharpening processing unit is weakened and the high frequency of the sharpening band filter The sharpening processing apparatus according to claim 1 or 2, wherein a signal component to which the effect of the sharpening processing is given is set by a relative increase in response. When the frequency state determination unit determines that the high frequency component of the input video signal is relatively small, the sharpening processing unit intensifies the degree of the sharpening processing in the sharpening processing unit to the first threshold, and the sharpening band Setting a signal component that is effective for the sharpening process to a level corresponding to the first threshold by a relative decrease in the high-frequency response of the filter;
When the frequency state determination unit determines that the high frequency component of the input video signal is relatively large, the degree of sharpening processing in the sharpening processing unit is reduced to a second threshold, and the sharpening band Setting a signal component to which the effect of the sharpening process is given by a relative increase in the high-frequency response of the filter to a level corresponding to the second threshold;
When the frequency state determination unit determines that the high frequency component of the input video signal is relatively small or not, the degree of sharpening processing in the sharpening processing unit is set to the first threshold value and the first threshold value. The sharpening processing apparatus according to claim 1, wherein the sharpening processing apparatus is configured to adjust between the second threshold values.   The sharpening processing apparatus according to claim 3, further comprising means for determining a default value of a degree of sharpening processing in the sharpening processing unit.   The input video signal includes a luminance signal and a color difference signal, and the frequency state determination unit is configured to detect at least the frequency state of the luminance signal in units of frames of the input video signal. 2. The sharpening apparatus according to 2. Receives an input video signal in a predetermined signal format that can include a pseudo high-resolution video signal obtained by up-converting relatively low-resolution video content and a high-resolution video signal originally containing high-resolution video content, and is included in this input video signal A frequency state determination unit for determining the frequency state of the video content to be recorded,
A signal component used for image sharpening processing is extracted from the input video signal, and when the frequency state determination unit determines that the high frequency component of the input video signal is relatively small, A sharpened bandpass filter that is adjusted so that the frequency response falls relatively;
A sharpening processing unit that performs a sharpening process on the input video signal using a signal component extracted from the sharpening band filter, and provides a video output signal subjected to the sharpening process;
A video apparatus comprising a display unit for displaying a video corresponding to the video output signal provided from the sharpening processing unit. Determination of whether a pseudo high resolution video signal obtained by up-converting video content of the first resolution or a high resolution video signal including video content of the second resolution higher than the first resolution is input. And
A sharpening processing block for sharpening at least one of the pseudo high resolution video signal or the high resolution video signal;
The sharpening processing block is configured to change at least one of a degree of sharpening processing for the pseudo high resolution video signal and a degree of sharpening processing for the high resolution video signal according to a determination result of the determination unit. Video equipment. Receiving an input video signal of a predetermined signal format in which a pseudo high resolution video signal obtained by up-converting relatively low resolution video content and a high resolution video signal including originally high resolution video content can be mixed,
Detecting a frequency state of video content included in the input video signal;
When it is determined that the high frequency component of the input video signal is relatively small, the high frequency response of the signal component used for video sharpening processing of the input video signal is relatively lowered,
A sharpening processing method for performing a sharpening process on the input video signal using a signal component used for the sharpening process.

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