JP2008122883A - Image display device and method, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device that can provide a picture giving a less feeling of blur while improving responsiveness of a motion picture, and an image display method. <P>SOLUTION: A responsiveness improving circuit 50 has a frame delay means 51 of delaying an input video signal by one frame and outputting the video signal, a multiplication value determining means 52 of determining a value which is multiplied to the video signal input from the input video signal and delayed video signal, a high-frequency component detecting means 53 of multiplying the input video signal by the value determined by the multiplication value determining means 52 and then detecting a high-frequency component, and a difference value detecting means 54 of detecting the difference between the input video signal and delayed video signal. Then the responsiveness improving circuit 50 adds the high-frequency component detected by the high-frequency component detecting means 53 to the value detected by the difference value detecting means 54 and then outputs the addition result. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display device such as a projector device that outputs an image, and more particularly to a technique for improving responsiveness in moving images.

  When an image display device such as a projector device is displaying and outputting an image, the response speed of the built-in liquid crystal panel is slow, so blurring and afterimages remain when displaying moving images, and the displayed image deteriorates. It becomes difficult to see. One technique for improving the responsiveness relating to such moving images is a moving image processing apparatus disclosed in Patent Document 1.

  FIG. 11 is a block diagram showing a moving image processing apparatus disclosed in Patent Document 1. In FIG. The moving image processing apparatus 10 includes a frame memory 100, an edge detection unit 102, a gate array 104, and an array data holding unit 106. The moving image processing apparatus 10 determines an enhanced gradation that is an enhanced gradation value to be output to the liquid crystal display device 20. The input video information is sent to the frame memory 100, the edge detector 102, and the gate array 104. The frame memory 100 holds the input video information for one frame period, and outputs the video information delayed by one frame period. When the subsequent second frame is input, the edge detection unit 102 detects an edge from the second frame and sends it to the gate array 104 as an edge detection image. The array data holding unit 106 holds initial emphasized gradation data as an LUT. The gate array 104 determines the initial emphasis gradation based on the LUT, and further performs a predetermined amount of emphasis processing on the initial emphasis gradation based on the edge intensity of the edge detection image, so that the liquid crystal is actually liquid crystal. Emphasized gradation to be written to the display device 20 is generated.

As described above, when the video information is input, the response characteristic of the moving image processing apparatus is improved by detecting and enhancing the difference in gradation between the current video and the previous video. Further, since the difference enhancement amount is corrected to a larger value with respect to the edge region of the current video, the response of the moving image is further improved.
JP 2006-98803 A

  However, there are various types of video such as a bright video and a dark video as a whole. Especially, for a middle-tone video, a difference from the edge area of the original video is simply as in Patent Document 1. Just increasing the amount of emphasis (so-called overdrive) does not necessarily improve the response of the video.

  For example, there may be an improvement in responsiveness, especially when the original video has a large difference in black and white levels, but there are few black and white level differences in the original video, that is, when there are many intermediate tones. Since there are few edge areas, there is no effect.

  In addition, if the difference amount is simply emphasized in the edge area, the video image may be outlined and may be far from the video image desired by the viewer.

  In view of the above problems, an object of the present invention is to provide an image output apparatus and an image output method that can provide a video with less blur while improving the response to a moving image.

The first aspect of the present invention is a frame delay means for delaying the first video signal by one screen and outputting it as a second video signal;
Multiplication value determining means for determining a value by which the first video signal is multiplied from the first video signal and the second video signal;
High frequency component detection means for detecting a high frequency component of the third video signal after multiplying the first video signal by the value determined by the multiplication value determination means to obtain a third video signal;
Difference value detecting means for detecting a difference between the first and second video signals;
Since the image display apparatus includes an adding unit that adds a high-frequency component of the third video signal to the third video signal according to a value detected by the difference value detecting unit. This has the effect of improving the responsiveness of a moving image and making it possible to produce a video with little afterimage or blur.

  The second aspect of the present invention includes a high frequency component adjusting unit that adjusts the detected high frequency component according to a difference value detected by the difference value detecting unit and an amplitude level of the high frequency component. Since the image display device according to the first aspect of the present invention has an effect of enhancing the delicate feeling of a desired portion of an image, rather than emphasizing contours that are harmful due to high frequency components.

  The third aspect of the present invention is the image display device according to claim 1, further comprising a high-frequency component amplifying unit for amplifying the high-frequency component after being detected by the high-frequency component detecting unit. It has the effect that the image can be made with less afterimage and blur.

  4th this invention comprises the difference value adjustment means which adjusts the difference value detected by the said difference value detection means, and after adjusting a difference value by the said difference value adjustment means, said 3rd according to the said difference value 2. The image display apparatus according to claim 1, wherein the high frequency component of the video signal is added. Therefore, the image display apparatus has an effect of improving the discrimination accuracy between the still image and the moving image.

  According to a fifth aspect of the present invention, there is provided a color component adjustment unit that adjusts an amount of a color component according to an amount obtained by adding high frequency components of the third video signal, and the color component is adjusted according to the difference value adjustment unit. The image display device according to claim 1, which is adjusted, has an effect of preventing a problem that the outline becomes white and thin when only the luminance is increased, and can display the image in a normal color.

  As described above, the present invention can adjust the high-frequency component of an overdriven video in an image display device such as a projector, particularly a device incorporating a liquid crystal panel that has poor response to moving images. It is possible to provide an effect of improving and providing a video with less blur.

  Hereinafter, embodiments of an image display device and an image display method according to the present invention will be described with reference to the drawings, taking a projector device as an example.

(Embodiment 1)
FIG. 1 is a configuration diagram showing a projector device which is an image display device, and FIG. 2 is an external view of the projector device according to the first embodiment of the present invention.

  As shown in FIG. 1, the projector apparatus 1 is connected to a personal computer 10 using a video cable, receives a video signal output from the personal computer 10 via a video cable, and performs signal processing on the received video signal. Then, the image is developed on the built-in liquid crystal panel and projected onto the screen 20.

  As shown in FIG. 2 as an example, the housing of the projector apparatus 1 includes a VIDEO terminal 21, an S-VIDEO terminal 22, an RGB / YPbPr input terminal 23, a remote control light receiving unit 24, a lens 25, a direction key 26, and a decision button 27. The RGB / YPbPr input terminal 23 receives the luminance signal Y, the color difference signal Pb, and the color difference signal Pr output from the personal computer 10, and the external light sensor 28 is provided around the projector device 1. Detect the ambient light illuminance. Reference numeral 29 denotes a remote controller for operating the projector apparatus 1 from a remote position.

  As an example, the resolution of the image represented by the video signal output from the personal computer 10 is VGA (Video Graphics Array) including 640 × 480 pixels on one screen.

  Further, it is assumed that the projector device 1 is based on a specification that represents from 1024 gradations to the lowest luminance for each pixel.

  Next, the projector device according to the first embodiment of the present invention will be described with reference to FIG. 3 which is a detailed block diagram.

  The VIDEO terminal 21 is a terminal for inputting an NTSC composite video signal.

  The S-VIDEO terminal 22 is a terminal for inputting an S video signal.

  The RGB / YPbPr input terminal 23 is a terminal for inputting an RGB signal or a YPbPr signal.

  The input selector 30 is a selector for selecting one of the composite video signal input from the VIDEO terminal 21 and the S video signal input from the S-VIDEO terminal 22.

  The Y / C separation circuit 32 is a circuit for separating the composite video signal input by the color decoder 31 into a Y signal and a C signal.

  The color decoder 31 is a decoder for color-decoding a Y / C separated signal or an input Y / C signal into a YPbPr signal.

  The matrix circuit 33 is a circuit for performing matrix processing when the YPbPr signal input from the RGB / YPbPr input terminal 23 is converted into an RGB signal.

  The input selector 34 is a selector for selecting one of the RGB signals input from the RGB / YPbPr input terminal 23 and the RGB signals generated by the matrix circuit 33.

  The input selector 34 is a selector for selecting any analog signal from the YPbPr signal generated by the color decoder 31 and the RGB signal input by the input selector 35.

  The A / D converter 36 is a converter for A / D converting the analog signal selected by the input selector 35 into a 10-bit digital signal.

  The resize / freeze / on-screen generation circuit 40 resizes the digital signal A / D converted by the A / D converter 36 in accordance with the number of pixels of the LCD (Liquid Crystal Display) panels 91 to 93, and superimposes the on-screen. It is a circuit for making it. In addition, this circuit has a function of correcting the keystone.

  The responsiveness improvement circuit 50 is a circuit that improves the responsiveness of the video data output from the resize / freeze / on-screen generation circuit 40 during a moving image.

  The main microcomputer 70 performs all control of the entire apparatus such as power supply (not shown) control, fan (not shown) control, temperature control, and input switching control, and also controls the responsiveness improvement circuit 50.

  The digital phase expansion circuits 81 to 83 are circuits for phase expansion of the digital signal improved by the responsiveness improvement circuit 50 in consideration of the operation speed of drive drivers (not shown) of the LCD panels 91 to 93.

  A panel driving IC (Integrated Circuit) 90 is a circuit for driving the LCD panels 91 to 93.

  The LCD panels 91 to 93 are panels for color-displaying digital signals color-corrected by the responsiveness improving circuit 50 and phase-developed by the digital phase developing circuits 81 to 83.

  Next, the operation of the projector apparatus according to the present embodiment will be described with reference to FIGS.

  4 is a detailed diagram of the responsiveness improvement circuit 50, FIG. 5 is a diagram for explaining overdrive, and FIG. 6 is a diagram for explaining high-frequency component detection.

  First, when the video signal output from the resize / freeze / on-screen generation circuit 40 is input, the frame delay means 51 stores the video signal for one screen. Thereafter, the video signal stored by the frame delay unit 51 and the video signal newly input to the responsiveness improvement circuit 50 are input to the multiplication value determination unit 52.

  The multiplication value determining means 52 determines a multiplication value to be applied to the current video signal according to the level of the input current video signal and the video signal delayed by one screen. For example, as shown in FIG. 5, when the current video signal has 512 levels / 1024 gradations and the video signal delayed by one screen input from the frame delay means 51 has 10 levels / 1024 gradations. By setting the multiplication value to 140/128 levels, the video signal after being multiplied by the multiplier 60 becomes 512 levels × 140/128 = 560 levels / 1024 gradations, and the resize / freeze / on-screen generation circuit 40. The level of the video signal input from is emphasized.

  Thereafter, the high frequency component detection means 53 detects the high frequency component of the emphasized video signal. As an example of the high frequency component detection means 53, a description will be given as means for detecting high frequency components in the vertical direction and horizontal direction on one screen.

  For example, as shown in FIG. 6, consider a filter that detects high-frequency components of three pixels in the horizontal and vertical directions. When considering continuous video signals when the coefficients of this filter are set to, for example, -1/2, 1, and -1/2, 128 levels / 1024 gradations, 512 levels / 1024 gradations, 512 levels / 1024 gradations And When this is multiplied by the filter coefficient, a high frequency component of 192 levels / 1024 gradations is detected. The vertical direction is similarly detected.

  The detected high frequency component is added by the adder 62 to the video signal multiplied by the multiplier 60. The timing for adding is determined by the difference value detecting means 54.

  The difference value detection means 54 detects the difference value between the video signal input from the resize / freeze / on-screen generation circuit 40 and the video signal delayed by one frame by the frame delay means 51. For example, when the video signal input from the resize / freeze / on-screen generation circuit 40 has 128 levels / 1024 gradations and the video signal delayed by one frame by the frame delay means 51 has 640 levels / 1024 gradations, the difference The value is 512 levels / 1024 gradations.

  Subsequently, the high frequency component 192 level / 1024 gradation output from the high frequency component detection means 53 is multiplied by the difference value 512 level / 1024 gradation by the multiplier 61. As a result, the high frequency component becomes 96 levels / 1024 gradations, is added to the video signal multiplied by the multiplier 60 by the adder 62, and is output from the response improvement circuit 50.

  On the other hand, consider a still image. When the video signal delayed by one frame by the frame delay means 51 has 128 levels / 1024 gradations, the difference value becomes 0 level / 1024 gradations. Subsequently, the difference value detected by the difference value detection means 54 by the multiplier 61 is multiplied by the high frequency component output by the high frequency component detection means 53. At this time, as described above, when the difference value becomes 0 level / 1024 gradations, the high frequency component becomes 0 level / 1024 gradations, and therefore, 0 level / 1024 gradations are added to the adder 62. The video signal multiplied by the multiplier 60 is output from the response improvement circuit 50 as it is.

  Thereafter, the video signal is sent to the digital phase expansion circuits 81-83.

  As described above, according to the present embodiment, the user delays the first video signal by one screen with respect to the input video signal and outputs the second video signal as the frame delay means, the first video A multiplication value determining means for determining a value by which the first video signal is multiplied from the signal and the second video signal, the first video signal is multiplied by the value determined by the multiplication value determining means to improve response characteristics, and third A high frequency component detecting means for detecting a high frequency component of the third video signal and a difference value detecting means for detecting a difference between the first and second video signals. By adding the high-frequency component of the third video signal in accordance with the value detected in the above, it is possible to make the video with less afterimage and blurring in the moving image.

  Here, the high frequency component detection means 53 is designated as a horizontal filter and a vertical filter, but either one of the filters may be used. In addition, although an example in which the number of pixels used for the filter is three pixels is given, a multi-pixel smaller or larger than three pixels may be used.

(Embodiment 2)
The basic configuration of the image processing apparatus of the second embodiment of the present invention is the same as that of the first embodiment. The image signal input to the responsiveness improvement circuit 50 is delayed by one frame by the frame delay means and the current signal. The value to be multiplied with the current signal is determined from the value of. After multiplying the current signal, a high frequency component of the signal is detected and added according to a difference value between the current signal and a signal delayed by one screen.

  Hereinafter, the difference from the first embodiment will be mainly described.

  FIG. 7 is a detailed diagram of the responsiveness improvement circuit 50 according to the second embodiment. The difference from the first embodiment is that a high frequency component adjusting means 55 is further provided. The high frequency component adjusting means 55 used in the present embodiment will be described.

  The high frequency component detected by the high frequency component detecting means 53 has the effect of improving the response during moving images, but at the same time, the contour of the image may be excessively emphasized (ringing phenomenon). In particular, since the enhancement is performed by the multiplication value determined by the multiplication value determining means 52, the effect is great, but the edge enhancement is also increased. Therefore, by providing the high frequency component adjusting means 55 for the detected high frequency component, it is possible to obtain the effect of only a desired portion. The function will be described.

  First, when a high frequency component is input to the high frequency component adjusting means 55, the amplitude level of the high frequency component is clipped over a certain value. For example, it is assumed that the high frequency components of three consecutive pixels in the horizontal direction of the image are −80 level / 1024 gradation, 10 level / 1024 gradation, and 240 level / 1024 gradation. At this time, for example, when the level to be clipped is 40 levels / 1024 gradations in absolute value, the three pixels described above are -40 levels / 1024 gradations, 10 levels / 1024 gradations, and 40 levels / 1024 gradations, respectively. Become. This is sent to the multiplier 61.

  In the multiplier 61, as in the first embodiment, the difference value detected by the difference value detector 54 is multiplied, and the video signal multiplied by the multiplier 60 is added by the adder 62.

  As described above, according to the present embodiment, by adjusting the amplitude level after detecting the high frequency component, it is possible to correct overcorrection of the high frequency component added to the video signal, particularly in the contour portion. Instead of simply emphasizing the contour, it is possible to improve the response of a desired portion and provide a delicate image.

  In this embodiment, three horizontal pixels are handled, but three vertical pixels or both may be used. Furthermore, the present invention can be similarly applied not only to three pixels but also to many pixels.

(Embodiment 3)
The basic configuration of the image processing apparatus according to the third embodiment of the present invention is the same as that of the first embodiment. The image signal input to the responsiveness improvement circuit 50 is delayed by one frame by the frame delay means and the current signal. The value to be multiplied with the current signal is determined from the value of. After multiplying the current signal, a high frequency component of the signal is detected and added according to a difference value between the current signal and a signal delayed by one screen.

  Hereinafter, the difference from the first embodiment will be mainly described.

  FIG. 8 is a detailed diagram of the responsiveness improvement circuit 50 according to the third embodiment. The difference from the first embodiment is that a high frequency component amplifying means 56 is further provided. The high frequency component amplification means 56 used in this embodiment will be described.

  When the high frequency component output from the high frequency component detecting means 53 is input to the high frequency component amplifying means 56, the high frequency component is amplified. For example, it is assumed that the high frequency components of three consecutive pixels in the horizontal direction of the image are −80 level / 1024 gradation, 10 level / 1024 gradation, and 240 level / 1024 gradation. At this time, if each level is doubled, 160 levels / 1024 gradations, 20 levels / 1024 gradations, and 480 levels / 1024 gradations are obtained. As a result, the high frequency component is amplified and sent to the multiplier 61.

  In the multiplier 61, as in the first embodiment, the difference value detected by the difference value detector 54 is multiplied, and the video signal multiplied by the multiplier 60 is added by the adder 62.

  As described above, according to the present embodiment, after detecting a high frequency component, the high frequency component is amplified, thereby further improving the responsiveness and providing a delicate image.

  Although the amplification level here is doubled, it may be as small as 0.5 times.

(Embodiment 4)
The basic configuration of the image processing apparatus according to the fourth embodiment of the present invention is the same as that of the first embodiment. The image signal input to the responsiveness improving circuit 50 is delayed by one frame by the frame delay means and the current signal. The value to be multiplied with the current signal is determined from the value of. After multiplying the current signal, a high frequency component of the signal is detected and added according to a difference value between the current signal and a signal delayed by one screen.

  Hereinafter, the difference from the first embodiment will be mainly described.

  FIG. 9 is a detailed diagram of the responsiveness improvement circuit 50 according to the fourth embodiment. The difference from the first embodiment is that a difference value adjusting means 57 is further provided. The difference value adjusting means 57 used in this embodiment will be described.

  After the difference between the current video signal and the video signal delayed by one screen is detected by the difference value detection unit 54, the detected difference value is notified to the difference value adjustment unit 57. The notified difference value is adjusted by the difference value adjusting means 57 and sent to the multiplier 61.

  For example, it is assumed that the notified difference value has an absolute value of 5 levels / 1024 gradations. At this time, the difference value adjusting means 57 sets 5 levels / 1024 gradations or less to 0 levels / 1024 gradations, and sends them to the multiplier 61 with 0 levels / 1024 gradations.

  In the multiplier 61, the high frequency component detected by the high frequency component detecting unit 53 is multiplied by the difference value adjusted by the difference value adjusting unit 57, and the video signal multiplied by the multiplier 60 is added by the adder 62.

  As described above, according to the present embodiment, by adjusting the difference value after detecting the difference value between the current video signal and the video signal delayed by one screen, the accuracy of the A / D converter 36 is actually In other words, where the difference value should be 0 level / 1024 gradations, the high frequency component at rest can be obtained by improving the place where the difference value exists and the discrimination accuracy at the time of still or moving image becomes worse. It is possible to avoid an adverse effect such as emphasis, improve the responsiveness of a desired portion, and provide a delicate image.

(Embodiment 5)
The basic configuration of the image processing apparatus of the fifth embodiment of the present invention is the same as that of the first embodiment. The image signal input to the responsiveness improvement circuit 50 is delayed by one frame by the frame delay means and the current signal. The value to be multiplied with the current signal is determined from the value of. After multiplying the current signal, a high frequency component of the signal is detected and added according to a difference value between the current signal and a signal delayed by one screen.

  Hereinafter, the difference from the first embodiment will be mainly described.

  FIG. 10 is a detailed diagram of the responsiveness improvement circuit 50 according to the fifth embodiment. The difference from the first embodiment is that a color component adjusting unit 58 is further provided and that the video signal is divided into a video luminance signal and a video color signal by the input selector 35 and input. The color component adjusting means 58 used in this embodiment will be described.

  The color component adjusting unit 58 notifies the color signal adjusting unit 58 of the video signal input to the responsiveness improving circuit 50 and the video signal after the high frequency component is added by the adder 62, and then the both video images notified. The video color signal is adjusted by the signal correction amount.

  For example, it is assumed that the video signal input to the responsiveness improvement circuit 50 has 128 levels / 1024 gradations, and the video signal after the high frequency component is added by the adder 62 has 192 levels / 1024 gradations. In this case, the correction amount is 192 levels / 128 levels, which is 1.5 times corrected. This correction magnification is applied to the video color signal. That is, if the video color signal is 128 levels / 1024 gradations, the color component adjusting means 58 outputs 192 levels / 1024 gradations.

  As described above, according to this embodiment, when only the luminance is corrected by correcting the video color signal according to the correction amount of the video signal input to the responsiveness improvement circuit 50 and the output video signal. In contrast to the possibility of adverse effects such as fading colors, the colors can also be corrected to normal colors by correcting at the same magnification, improving the response to moving images without fading colors. It is possible to provide images.

  The image display device of the present invention can improve the response of moving images, and is particularly useful for an image display device such as a projector incorporating a liquid crystal panel or the like.

The block diagram which shows the structure of the projector apparatus which is an image display apparatus 1 is an external view of a projector device according to an embodiment of the invention. The block diagram which shows the internal structure of the projector apparatus which concerns on one Embodiment of this invention. 1 is a block diagram showing an internal configuration of a response improvement circuit of an image processing apparatus according to a first embodiment of the present invention. The figure explaining the overdrive of the responsiveness improvement circuit of the image processing apparatus of Embodiment 1 of this invention The figure explaining the high frequency component detection of the responsiveness improvement circuit of the image processing apparatus of Embodiment 1 of this invention FIG. 3 is a block diagram showing an internal configuration of a response improvement circuit of an image processing apparatus according to a second embodiment of the present invention. FIG. 5 is a block diagram showing an internal configuration of a response improvement circuit of an image processing apparatus according to a third embodiment of the present invention. FIG. 5 is a block diagram showing an internal configuration of a response improvement circuit of an image processing apparatus according to a fourth embodiment of the present invention. FIG. 7 is a block diagram showing an internal configuration of a response improvement circuit of an image processing apparatus according to a fifth embodiment of the present invention. Block diagram of a video processing apparatus in a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector apparatus 10 Personal computer 20 Screen 21 VIDEO terminal 22 S-VIDEO terminal 23 RGB / YPbPr input terminal 24 VIDEO terminal 25 S-VIDEO terminal 26 RGB / YPbPr input terminal 27 Power ON / OFF button 28 Ambient light sensor 29 Remote controller 30 Input selector 31 Color decoder 32 Y / C separation circuit 33 Matrix circuit 34 Input selector 35 Input selector 36 A / D converter 40 Resizing / freezing / on-screen generation circuit 50 Responsiveness improvement circuit 51 Frame delay means 52 Multiplication value determination means 53 High Frequency component detecting means 54 Difference value detecting means 55 High frequency component adjusting means 56 High frequency component amplifying means 57 Difference value adjusting means 58 Color component adjusting means 60 Multiplier 61 Multiplier 62 Adder 70 Main microcomputer 71 External interface 81-83 Digital phase expansion circuit 90 Panel drive IC
91-93 LCD panel

Claims (11)

A frame delay means for delaying the first video signal by one screen and outputting it as a second video signal;
Multiplication value determining means for determining a value by which the first video signal is multiplied from the first video signal and the second video signal;
High frequency component detection means for detecting a high frequency component of the third video signal after multiplying the first video signal by the value determined by the multiplication value determination means to obtain a third video signal;
Difference value detecting means for detecting a difference between the first and second video signals;
An image display apparatus comprising: an adding unit that adds a high-frequency component of the third video signal to the third video signal according to a value detected by the difference value detecting unit. The image display apparatus according to claim 1, further comprising: a high frequency component adjusting unit that adjusts the detected high frequency component according to a difference value detected by the difference value detecting unit and an amplitude level of the high frequency component. The image display apparatus according to claim 1, further comprising a high frequency component amplifying unit that amplifies the high frequency component after being detected by the high frequency component detecting unit. A differential value adjusting unit that adjusts the differential value detected by the differential value detecting unit; and after adjusting the differential value by the differential value adjusting unit, the high-frequency component of the third video signal according to the differential value The image display device according to claim 1, wherein: The image display apparatus according to claim 1, further comprising a color component adjusting unit that adjusts an amount of a color component in accordance with an amount obtained by adding high frequency components of the third video signal. A frame delay step of delaying the first video signal by one screen and outputting it as a second video signal;
A multiplication value determining step for determining a value by which the first video signal is multiplied from the first video signal and the second video signal;
A high frequency component detecting step of detecting a high frequency component of the third video signal after multiplying the first video signal by the value determined in the multiplication value determining step to obtain a third video signal;
A difference value detecting step for detecting a difference between the first and second video signals,
An image display method comprising: an addition step of adding a high-frequency component of the third video signal to the third video signal according to the value detected in the difference value detection step. The image display method according to claim 6, further comprising a high frequency component adjustment step of adjusting the detected high frequency component according to a difference value detected in the difference value detection step and an amplitude level of the high frequency component. The image display method according to claim 6, further comprising a high-frequency component amplification step for amplifying the high-frequency component after detection by the high-frequency component detection step. A differential value adjusting step for adjusting the differential value detected in the differential value detecting step; and after adjusting the differential value by the differential value adjusting step, a high frequency component of the third video signal in accordance with the differential value The image display method according to claim 6, wherein the values are added. The image display method according to claim 6, further comprising a color component adjustment step of adjusting an amount of a color component in accordance with an amount obtained by adding high frequency components of the third video signal. The computer program of the image display method in any one of Claims 6 thru | or 10.

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