JP2018152759A - Image processing apparatus, image display apparatus, image processing method, and image display method - Google Patents

Abstract

Kind Code: A1 An image processing apparatus and the like are provided for improving a displayed image when an image having a pattern such as black characters on a white background is displayed. Kind Code: A1 An image processing device for correcting an image signal, comprising: a filter unit for filtering a luminance signal of the image signal; a luminance signal correction amount calculation unit that calculates a correction amount of a luminance signal; and a luminance signal correction unit that corrects the luminance signal of the image signal using the correction amount calculated by the luminance signal correction amount calculation unit. The filter section has at least one filter for averaging the luminance signal of the image signal for pixel blocks, and the luminance signal correction amount calculation section calculates the value of at least one pixel. and adjusting the amount of correction based on the result of filtering by the at least one filter for the pixel block containing the pixel. [Selection drawing] Fig. 2

Description

  The present invention relates to an image processing device, an image display device, an image processing method, and an image display method.

  In recent years, the number of gradations or the dynamic range of an image tends to increase. For this reason, when an image is displayed, if the dark or bright portion of the displayed image is not sufficiently expressed due to insufficient contrast of the display device, or the details of the dark or bright portion of the displayed image are completely reproduced May not be. In order to express such dark or bright details of an image, an image adaptive tone correction process called black and white expansion may be performed.

  Further, Patent Document 1 proposes an image processing apparatus that improves image details without affecting other luminance regions (see Patent Document 1). In the technique described in Patent Document 1, an averaging process is performed by a plurality of filter circuits provided in a multistage filter circuit, and a gain for correction is obtained.

JP 2010-63064 A

  In the conventional technique, for example, since the averaging process is performed by a plurality of filter circuits, when an image having a pattern of black characters or the like is displayed on a white background, it may be easy to see the contradiction of correction. As a contradiction, for example, there was an image blur similar to a halo phenomenon in which white spots such as letters look like halos.

  The present invention has been made in view of the above points, and when an image having a pattern such as black characters is displayed on a white background, an image processing apparatus, an image display apparatus, An object is to provide an image processing method and an image display method.

In order to solve at least one of the above problems, an aspect of the present invention is an image processing device that corrects an image signal, and includes a filter unit that performs filtering on a luminance signal of the image signal, and the filter unit. A luminance signal correction amount calculation unit that calculates a correction amount of the luminance signal of the image signal based on a result of the filtering performed, and the correction amount calculated by the luminance signal correction amount calculation unit, the image signal A luminance signal correction unit that corrects the luminance signal of the image signal, wherein the filter unit includes at least one filter that averages the luminance signal of the image signal with respect to a pixel block, and the luminance The signal correction amount calculation unit includes a value of at least one pixel and a filter based on the at least one filter for the pixel block including the pixel. Based on the results of the ring, adjusting the correction amount, an image processing apparatus.
With this configuration, in the image processing apparatus, the luminance signal of the image signal is averaged with respect to the pixel block by at least one filter, and the value of at least one pixel and the pixel block including the pixel are compared with each other. The correction amount is adjusted based on the result of filtering by at least one filter. Thereby, in the image processing apparatus, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image can be improved.

According to another aspect of the present invention, in the image processing apparatus, the luminance signal correction amount calculation unit calculates a combination of the value of the at least one pixel and a result of filtering by the at least one filter and the correction amount. A configuration may be used that has a correspondence with information for adjustment and adjusts the correction amount based on the correspondence and the combination.
With this configuration, in the image processing apparatus, the correction amount based on the correspondence between the combination of the value of at least one pixel and the filtering result by the at least one filter and the information for adjusting the correction amount, and the combination Adjust. Thereby, in the image processing apparatus, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image can be improved on the basis of the correspondence set in advance.

In one embodiment of the present invention, the image processing apparatus may have a configuration in which the at least one filter has a characteristic of averaging pixel values included in the pixel block.
With this configuration, in the image processing apparatus, at least one filter has a characteristic of averaging the values of pixels included in the pixel block. Thereby, in the image processing apparatus, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image can be improved.

In one embodiment of the present invention, in the image processing apparatus, the filter unit includes a plurality of filters corresponding to a plurality of pixel blocks having different sizes, and the luminance signal correction amount calculation unit includes the plurality of filters. A configuration may be used in which the correction amount is adjusted based on the result of filtering by a filter corresponding to a pixel block having a size other than the maximum among the filters.
With this configuration, the image processing apparatus adjusts the correction amount based on the result of filtering by the filter corresponding to the pixel block having a size other than the maximum among the plurality of filters. Thereby, in the image processing apparatus, for example, an image displayed when an image having a pattern such as a black character on a white background is displayed based on a result of filtering by a filter corresponding to a pixel block having a size other than the maximum. Can be improved.

In one embodiment of the present invention, in the image processing apparatus, the luminance signal correction amount calculation unit calculates the correction amount based on a result of filtering by a filter corresponding to the smallest pixel block among the plurality of filters. A configuration that adjusts may be used.
With this configuration, the image processing apparatus adjusts the correction amount based on the result of filtering by the filter corresponding to the smallest pixel block. Thereby, in the image processing apparatus, for example, when an image having a pattern such as a black character on a white background is displayed based on the result of filtering by the filter corresponding to the smallest pixel block, the displayed image is improved. Can do.

According to another aspect of the present invention, in the image processing apparatus, the luminance signal correction amount calculation unit includes a value of the one pixel and a result of filtering by the one filter for the pixel block including the pixel. When the absolute value of the difference between and exceeds a predetermined threshold, a configuration may be used in which the degree of influence of the correction amount is adjusted to be smaller than in the case where it is not.
With this configuration, in the image processing apparatus, if the absolute value of the difference between the value of one pixel and the result of filtering by one filter for the pixel block including the pixel exceeds a predetermined threshold value, Compared with the case where it is not, it adjusts so that the influence of a correction amount may become small. Thereby, in the image processing apparatus, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image can be improved.

In order to solve at least one of the above problems, one embodiment of the present invention is an image display device that displays an image based on an image signal, the image processing device correcting the image signal, and the image processing device. And an image display unit that displays an image based on the corrected image signal.
With this configuration, the image display apparatus displays an image based on the image signal corrected by the image processing apparatus. Thereby, in the image display device, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image can be improved.

In order to solve at least one of the above problems, an aspect of the present invention is an image processing method for correcting an image signal, wherein the filter unit performs filtering on the luminance signal of the image signal to correct the luminance signal. The amount calculation unit calculates a correction amount of the luminance signal of the image signal based on a result of the filtering performed by the filter unit, and the luminance signal correction unit calculates the correction calculated by the luminance signal correction amount calculation unit. Using the quantity to correct the luminance signal of the image signal,
The filter unit includes at least one filter that averages the luminance signal of the image signal with respect to a pixel block, and the luminance signal correction amount calculating unit calculates a value of at least one pixel. The image processing method adjusts the correction amount based on a result of filtering by the at least one filter for the pixel block including the pixel.
With this configuration, in the image processing method, the luminance signal of the image signal is averaged with respect to the pixel block by at least one filter, and the value of at least one pixel and the pixel block including the pixel are compared with each other. The correction amount is adjusted based on the result of filtering by at least one filter. Thereby, in the image processing method, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image can be improved.

In order to solve at least one of the above problems, one embodiment of the present invention is an image display method for displaying an image based on an image signal, wherein the image display unit is based on the image signal corrected by the image processing method. This is an image display method for displaying images.
With this configuration, in the image display method, an image is displayed based on the image signal corrected by the image processing method. Thereby, in the image display method, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image can be improved.

  As described above, according to the image processing device, the image display device, the image processing method, and the image display method according to the present invention, the luminance signal of the image signal is averaged with respect to the pixel block by at least one filter. The correction amount is adjusted based on the value of at least one pixel and the result of filtering by the at least one filter for the pixel block including the pixel. Thereby, in the image processing device, the image display device, the image processing method, and the image display method according to the present invention, for example, when an image having a pattern such as a black character is displayed on a white background, the displayed image is improved. Can do.

It is a figure which shows the schematic structural example of the image display system which concerns on embodiment (1st Embodiment) of this invention. It is a figure which shows the schematic structural example of the image process part which concerns on embodiment (1st Embodiment) of this invention. It is a figure which shows the schematic structural example of the luminance signal correction amount calculation circuit which concerns on embodiment (1st Embodiment) of this invention. It is a figure which shows an example of the pixel block which has a some pixel which concerns on embodiment (1st Embodiment) of this invention. It is a figure which shows an example of the relative magnitude | size of the luminance gain which concerns on embodiment (1st Embodiment) of this invention. It is a figure which shows an example of the black character at the time of the white which concerns on embodiment (1st Embodiment) of this invention. It is a figure which shows an example of the contrary of a display. It is a figure which shows the schematic structural example of the luminance signal correction amount calculation circuit which concerns on embodiment (2nd Embodiment) of this invention.

Embodiments of the present invention will be described in detail with reference to the drawings.
In this embodiment, a configuration obtained by improving the image processing unit described in FIG. 4 of Patent Document 1 will be described as an example. For this reason, in this embodiment, the same technology as that of Patent Literature 1 may be applied to the same components as those of Patent Literature 1.

(First embodiment)
[Overview of image display system configuration and operation]
FIG. 1 is a diagram showing a schematic configuration example of an image display system 1 according to an embodiment (first embodiment) of the present invention.
The image display system 1 includes a projector 11 (an example of an image display device) and a screen 12 (an example of a projection surface).
The projector 11 includes an image processing unit 31 (an example of an image processing device) and a projection unit 32.

The projector 11 receives an image signal from an external device. The external device may be an arbitrary device, for example, a computer or a portable storage medium. As another configuration example different from that in FIG. 1, an image signal may be generated inside the projector 11.
The image processing unit 31 performs a predetermined process on the image signal input to the projector 11 and outputs the image signal subjected to the process to the projection unit 32. The predetermined processing may include arbitrary processing, for example, processing for adjusting the characteristics of the image, or processing for superimposing another image on the image of the input image signal. Also good.
The projection unit 32 generates light corresponding to the image of the image signal input from the image processing unit 31 and projects the light on the screen 12 outside the projector 11.
Note that the screen 12 may be an arbitrary one. For example, not only a screen prepared exclusively for projecting the projection light from the projector 11 but also a wall of a room may be used as the screen 12. .

Here, the projection unit 32 projects an image to be displayed on the screen 12. As a result, the projected image is displayed on the screen 12. The display target image may be an arbitrary image, and may include, for example, a menu image that allows the user to specify an item from among a plurality of items.
Specifically, the projection unit 32 includes a liquid crystal panel, a light source, and a projection lens. The projection unit 32 converts the signal of the display target image into image information representing the gradation of each pixel of the liquid crystal panel for each of RGB (Red, Green, Blue), and a drive voltage corresponding to the image information. Is applied (driven) to each pixel of the liquid crystal panel. By this application, the liquid crystal panel forms light incident on the liquid crystal panel from the light source as light (modulated light) that displays an image corresponding to the image information described above. The projection unit 32 may include a reflector that reflects light emitted from the light source toward the liquid crystal panel, and the reflected light may be formed on the liquid crystal panel as light that displays an image corresponding to the image information described above. The projection unit 32 projects the light that projects the image formed on the liquid crystal panel through the projection lens.
The light source is, for example, a discharge-type light source lamp made of an ultra-high pressure mercury lamp or a metal halide lamp, but is not limited to a light source lamp, and an LED (Light Emitting Diode) light source or a laser light source may be used. The liquid crystal panel is, for example, a transmissive liquid crystal panel corresponding to each of RGB, which is the three primary colors of light, in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal panel is not limited to a transmissive liquid crystal panel, and a reflective liquid crystal panel may be used. Moreover, as a light valve of the projection part 32, it replaces with the structure provided with a liquid crystal panel, and the structure provided with DMD (Digital Mirror Device) etc. may be used.

FIG. 2 is a diagram illustrating a schematic configuration example of the image processing unit 31 according to the embodiment (first embodiment) of the present invention.
The image processing unit 31 includes a line memory 111, a current pixel memory 112, a line memory 113, a multistage filter circuit 131, a luminance signal correction amount calculation circuit 132, a luminance signal correction circuit 133, and a color difference gain calculation circuit 134. The color difference signal correction circuit 135 is provided.
The multistage filter circuit 131 includes three filter circuits 151-1 to 151-3.

  Here, in the present embodiment, the luminance signal correction and the color difference signal correction performed in the image processing unit 31 will be described as an example. For this reason, in the present embodiment, the configuration in which the circuit that performs these corrections is provided in the image processing unit 31 is shown. However, for example, the image processing unit 31 may further include a circuit that performs other processing. In the present embodiment, since correction of the color difference signal is not essential, the image processing unit 31 may not include a circuit for correcting the color difference signal (for example, the color difference gain calculation circuit 134 and the color difference signal correction circuit 135).

An image signal input to the image processing unit 31 from the outside of the projector 11 includes a Y signal, a U signal, and a V signal. Here, the Y signal is a luminance signal, the U signal is a signal obtained by subtracting the luminance signal from the blue signal, and a predetermined coefficient, and the V signal is a predetermined coefficient obtained by subtracting the luminance signal from the red signal. The multiplied signal.
Note that the image signal is not necessarily a YUV signal, and may be any other signal.

A Y signal is input to the line memory 111.
The line memory 111 has a memory function, stores (stores) the input Y signal, and outputs the Y signal corresponding to each of the three filter circuits 151-1 to 151-3. Output to the filter circuits 151-1 to 151-3.
Further, the line memory 111 outputs the input Y signal to each of the luminance signal correction amount calculation circuit 132, the luminance signal correction circuit 133, and the color difference gain calculation circuit 134.
Note that each of the filter circuits 151-1 to 151-3, the luminance signal correction amount calculation circuit 132, the luminance signal correction circuit 133, and the color difference gain calculation circuit 134 of the multistage filter circuit 131 is stored in the line memory 111. A configuration for extracting necessary information (Y signal) from the signal may be used.

In the present embodiment, the filter circuit 151-1 is a circuit that performs filtering on a pixel block of a matrix of (vertical 7 pixels × horizontal 7 pixels). A Y signal corresponding to the pixel block is output from the line memory 111 to the filter circuit 151-1.
The filter circuit 151-2 is a circuit that performs filtering on a pixel block of a matrix of (vertical 5 pixels × horizontal 5 pixels). A Y signal corresponding to the pixel block is output from the line memory 111 to the filter circuit 151-2.
The filter circuit 151-3 is a circuit that performs filtering on a pixel block of a matrix of (vertical 3 pixels × horizontal 3 pixels). A Y signal corresponding to the pixel block is output from the line memory 111 to the filter circuit 151-3.

A Y signal is input to the current pixel memory 112. The current pixel memory 112 may be a line memory, for example.
The current pixel memory 112 has a memory function, stores (stores) the input Y signal, and outputs the Y signal to the luminance signal correction amount calculation circuit 132.
A configuration in which the luminance signal correction amount calculation circuit 132 extracts necessary information (Y signal) from the Y signal stored in the current pixel memory 112 may be used.
In the present embodiment, the current pixel means a pixel at a target timing (referred to as “current” in the present embodiment).

A U signal and a V signal are input to the line memory 113.
The line memory 113 has a memory function, stores (stores) the input U signal and V signal, and outputs the U signal and the V signal to the color difference signal correction circuit 135.
A configuration in which the color difference signal correction circuit 135 extracts necessary information (U signal and V signal) from the U signal and V signal stored in the line memory 113 may be used.

Each of the filter circuits 151-1 to 151-3 performs filtering of each pixel block on the Y signal input from the line memory 111, and outputs a signal of the filtering result to the luminance signal correction amount calculation circuit 132. .
The luminance signal correction amount calculation circuit 132 receives the Y signal input from the line memory 111, the filtering result signal input from each of the filter circuits 151-1 to 151-4, and the Y signal input from the current pixel memory 112. Based on the signal, the correction amount (luminance signal correction amount) of the Y signal is calculated, and a signal (luminance signal correction amount signal) representing the calculated luminance signal correction amount is output to the luminance signal correction circuit 133.
The luminance signal correction circuit 133 corrects the Y signal input from the line memory 111 using the luminance signal correction amount input from the luminance signal correction amount calculation circuit 132, and corrects the corrected Y signal (in this embodiment, in this embodiment). Y1 signal) is output to each of the color difference gain calculation circuit 134 and the projection unit 32. In the present embodiment, the luminance signal correction circuit 133 outputs a signal obtained as a result of adding the luminance signal correction amount input from the luminance signal correction amount calculation circuit 132 to the Y signal input from the line memory 111, and the corrected Y signal. (Y1 signal).

The color difference gain calculation circuit 134 calculates a color difference gain based on the Y signal input from the line memory 111 and the Y1 signal input from the luminance signal correction circuit 133, and a signal (color difference gain) indicating the calculated color difference gain. Signal) is output to the color difference signal correction circuit 135.
The color difference signal correction circuit 135 corrects the color difference of the U signal and V signal input from the line memory 113 using the color difference gain signal input from the color difference gain calculation circuit 134, and the corrected U signal ( In this embodiment, it is also referred to as a U1 signal) and a corrected V signal (also referred to as a V1 signal in this embodiment) is output to the projection unit 32.
The projection unit 32 inputs Y1 signal, U1 signal, and V1 signal as image signals, and projects an image according to these input signals.

FIG. 3 is a diagram showing a schematic configuration example of the luminance signal correction amount calculation circuit 132 according to the embodiment (first embodiment) of the present invention.
The luminance signal correction amount calculation circuit 132 includes three multipliers 211-1 to 211-3, one adder 212, a weight calculation circuit 231, a determination circuit 251, and a luminance gain calculation circuit 252. A container 253 is provided.

Filtering result signals output from the three filter circuits 151-1 to 151-3 are input to the multipliers 211-1 to 211-3. The filtering result signals output from the three filter circuits 151-1 to 151-3 are input to the weight calculation circuit 231.
Specifically, the filtering result signal output from the filter circuit 151-1 is input to each of the multiplier 211-1 and the weight calculation circuit 231. Further, the filtering result signal output from the filter circuit 151-2 is input to each of the multiplier 211-2 and the weight calculation circuit 231. Further, the filtering result signal output from the filter circuit 151-3 is input to each of the multiplier 211-3 and the weighting calculation circuit 231.
Further, the filtering result signal output from the filter circuit 151-3 is input to the determination circuit 251.
The Y signal output from the current pixel memory 112 is input to the determination circuit 251.
The Y signal output from the line memory 111 is input to the luminance gain calculation circuit 252.

  The weighting calculation circuit 231 is a weighting coefficient for correcting the signal output from the filter circuit 151-1 based on the filtering result signals input from the three filter circuits 151-1 to 151-3 and the filter circuit. A weighting coefficient for correcting the signal output from 151-2 and a weighting coefficient for correcting the signal output from the filter circuit 151-3 are calculated. The weighting calculation circuit 231 outputs a signal (weighting coefficient signal) representing the weighting coefficient calculated for the signal output from the filter circuit 151-1 to the multiplier 211-1 and the signal output from the filter circuit 151-2. Is output to the multiplier 211-2, and is multiplied by a signal (weighting coefficient signal) indicating the weighting coefficient calculated for the signal output from the filter circuit 151-3. To the device 211-3. Here, in the weighting calculation circuit 231, for example, the correspondence between the three input filtering result signals and the three weighting coefficient signals to be output at that time is set in advance in an LUT (Look Up Table) or the like. The correspondence is referred to.

The multiplier 211-1 multiplies the filtering result signal input from the filter circuit 151-1 by the weighting coefficient signal input from the weight calculation circuit 231, and outputs the multiplication result signal to the adder 212. To do.
The multiplier 211-2 multiplies the filtering result signal input from the filter circuit 151-2 by the weighting coefficient signal input from the weight calculation circuit 231, and outputs the multiplication result signal to the adder 212. To do.
Multiplier 211-3 multiplies the filtering result signal input from filter circuit 151-3 by the weighting coefficient signal input from weighting calculation circuit 231, and outputs the multiplication result signal to adder 212. To do.
The adder 212 adds the signals input from the three multipliers 211-1 to 211-3 and outputs a signal resulting from the addition to the multiplier 253.

Based on the filtering result signal input from the filter circuit 151-3 and the Y signal of the current pixel input from the current pixel memory 112, the determination circuit 251 has an image of the image signal being processed having a predetermined pattern. And a signal (determination result signal) representing the result of this determination is output to the luminance gain calculation circuit 252.
The luminance gain calculation circuit 252 receives the Y signal from the line memory 111 and the determination result signal from the determination circuit 251. The luminance gain calculation circuit 252 calculates a luminance gain based on the Y signal input from the line memory 111 and the determination result signal input from the determination circuit 251, and a signal (luminance gain signal) representing the calculated luminance gain. Is output to the multiplier 253.
The multiplier 253 multiplies the addition result signal input from the adder 212 by the luminance gain signal input from the luminance gain calculation circuit 252, and the signal resulting from the multiplication is a luminance signal correction amount signal (VA signal). ) To the luminance signal correction circuit 133.

[Details of multi-stage filter circuit and luminance signal correction amount calculation circuit]
<Description of multi-stage filter circuit>
FIG. 4 is a diagram showing an example of a pixel block having a plurality of pixels 1011 according to the embodiment (first embodiment) of the present invention.
In the example of FIG. 4, a pixel block of (vertical 7 pixels × horizontal 7 pixels) is shown. In the present embodiment, the vertical direction is represented by rows, and the horizontal direction is represented by columns.
In the example of FIG. 4, in order to make the drawing easy to see, only some of the pixels 1011 are marked, not all the pixels. Of the pixels in 7 rows × 7 columns, the pixel in 4 rows and 4 columns is the central pixel, and is represented by a pixel 1021 (one pixel 1011).

In the present embodiment, the line memory 111 stores at least a Y signal of (vertical 7 pixels × horizontal 7 pixels).
The filter circuit 151-1 performs predetermined filtering on a pixel value (Y signal) having a pixel 1021 as a processing target and having the pixel 1021 as the center (7 vertical pixels × 7 horizontal pixels). The predetermined filtering is, for example, a convolution operation between a pixel value of (vertical 7 pixels × horizontal 7 pixels, that is, 1st to 7th rows and 1st to 7th columns) and a predetermined filter coefficient matrix. Equivalent to.
The filter circuit 151-2 performs predetermined filtering on a pixel value (Y signal) having a pixel 1021 as a processing target and having the pixel 1021 as the center (vertical 5 pixels × horizontal 5 pixels). The predetermined filtering is, for example, a convolution operation between a pixel value of a pixel (5 pixels in the vertical direction × 5 pixels in the horizontal direction, that is, in the 2nd to 6th rows and the 2nd to 6th columns) and a predetermined filter coefficient matrix. Equivalent to.
The filter circuit 151-3 performs predetermined filtering on a pixel value (Y signal) having a pixel 1021 as a processing target and having the pixel 1021 as the center (vertical 3 pixels × horizontal 3 pixels). The predetermined filtering is, for example, a convolution operation between the pixel value of the pixel (3 pixels in the vertical direction × 3 pixels in the horizontal direction, that is, in the third to fifth rows and the third to fifth columns) and a predetermined filter coefficient matrix. Equivalent to.
In the present embodiment, the processing target pixel 1021 (Y signal, U signal, V signal) is processed in synchronization with these filtering result signals. In the present embodiment, the pixel 1021 is the current pixel.

Here, in the present embodiment, the filter circuit 151-1 performs a process of averaging the pixel values of the pixels 1011 as filtering.
Note that the image of the image signal may be, for example, a black and white or gray scale image, or may be a color image.
In the present embodiment, for example, the luminance signal (Y signal) has a value of 0 to 255. In a black and white image, white is displayed when the luminance signal has a value of 255, and black is displayed when the luminance signal has a value of 0. Actually, the luminance signal can take a value of 1 to 254.

<Luminance signal correction amount calculation circuit>
The determination circuit 251 detects the absolute value of the difference between the signal of the filtering result by the filter circuit 151-3 and the Y signal of the current pixel, and determines whether or not the detected absolute value of the difference exceeds a predetermined threshold value. .
If the determination circuit 251 determines that the detected absolute value of the difference exceeds a predetermined threshold (in this example, a positive value), the image of the image signal being processed has a predetermined pattern. Then, a determination is made and a signal (determination result signal) representing the result of this determination is output to the luminance gain calculation circuit 252.
On the other hand, if the determination circuit 251 determines that the absolute value of the detected difference is equal to or less than a predetermined threshold, the determination circuit 251 determines that the image of the image signal being processed does not have a predetermined pattern, and A signal representing the result (determination result signal) is output to the luminance gain calculation circuit 252.
Thus, in this embodiment, the determination circuit 251 determines whether the image of the image signal being processed is an image having a pattern such as black characters on a white background. That is, in the present embodiment, the predetermined pattern is a pattern of black characters or the like when white.
Normally, when the difference between two values (here, the absolute value) is large, the correlation between the two values is small, and when the difference between the two values (here, the absolute value) is small. The correlation between the two values is large.

Here, in the present embodiment, the determination circuit 251 determines whether or not the absolute value of the detected difference exceeds a predetermined threshold value. However, if a similar determination result is obtained, the determination method is arbitrary. May be. For example, the determination circuit 251 is divided into a case where the detected difference is positive and a case where the difference is negative (if the difference is 0, it may be included in either one or another). You may determine using a threshold value.
In the present embodiment, the determination circuit 251 determines whether or not the detected absolute value of the difference exceeds a predetermined threshold. As another configuration example, the detected absolute value of the difference is a predetermined threshold. You may determine whether it is above. That is, when the absolute value of the detected difference matches a predetermined threshold value, it may be included when it exceeds the threshold value, or may be included when it is less than the threshold value.
Also, any value may be used as the threshold value.

  In this embodiment, the determination circuit 251 outputs determination result signals for both of the two types of determination results to the luminance gain calculation circuit 252, but as another configuration example, the luminance gain calculation circuit 252 outputs the determination results. If it can be grasped, the determination circuit 251 may output a determination result signal to the luminance gain calculation circuit 252 for one of the two types of determination results. For example, the luminance gain calculation circuit 252 determines that the determination result signal is one when the determination result signal is not received from the determination circuit 251, and determines that the determination result signal is the other determination result when the determination result signal is received from the determination circuit 251. May be.

  If the luminance gain calculation circuit 252 determines that the image of the image signal being processed is not an image having a predetermined pattern based on the determination result signal input from the determination circuit 251, the luminance gain calculation circuit 252 inputs from the line memory 111. Based on the luminance signal (Y signal), the luminance gain signal having a value (luminance gain) corresponding to the luminance signal is output to the multiplier 253. Here, in the luminance gain calculation circuit 252, for example, the correspondence between the input luminance signal and the luminance gain signal to be output at that time is set in advance in the LUT or the like, and the correspondence is referred to.

  On the other hand, if the luminance gain calculation circuit 252 determines that the image of the image signal being processed is an image having a predetermined pattern based on the determination result signal input from the determination circuit 251, this is not the case. Is output to the multiplier 253, which has a luminance gain of a smaller value (in this case, an absolute value). Thus, when the luminance signal (Y signal) output from the line memory 111 is the same, the image of the image signal being processed is an image having a predetermined pattern as compared to the case where it is not. The absolute value of the luminance signal correction amount signal output from the multiplier 253 becomes small, and the degree of influence of the luminance signal correction amount signal becomes small.

  As an example, if the luminance gain calculation circuit 252 determines that the image of the image signal being processed is an image having a predetermined pattern based on the determination result signal input from the determination circuit 251, the luminance gain calculation circuit 252 is 0. A luminance gain signal having a luminance gain may be output to the multiplier 253. That is, when the image of the image signal being processed is an image having a predetermined pattern, the value of the luminance signal correction amount signal (VA signal) may be set to zero.

FIG. 5 is a diagram illustrating an example of the relative magnitude of the luminance gain according to the embodiment (first embodiment) of the present invention.
In the graph shown in FIG. 5, the horizontal axis represents the pixel value of the current pixel, and the vertical axis represents the result of averaging the pixel values by the filter circuit 151-3.
FIG. 5 shows two characteristics 2011 and 2012. A characteristic 2011 is represented by a straight line having a positive slope in contact with the vertical axis at a position where the value of the vertical axis is greater than zero. A characteristic 2012 is represented by a straight line that is in contact with the horizontal axis at a position where the value of the horizontal axis is greater than 0 and has a positive slope. The slopes of the two characteristics 2011 and 2012 may be arbitrary values, for example, 1. In addition, the slopes of the two characteristics 2011 and 2012 may be the same or different. Further, the position (value on each axis) where each of the two characteristics 2011 and 2012 is in contact with the axis (vertical axis or horizontal axis) may be arbitrary, may be the same, or May be different.

  In the example of FIG. 5, the luminance gain is set to a large value (here, absolute value) in the region between the two characteristics 2011 and 2012, and the luminance gain is small (here, in this case). Absolute value). That is, when the value on the horizontal axis is the same as or close to the value on the vertical axis, the difference (absolute value) between them is small, and it is determined that the image of the image signal being processed is not an image having a predetermined pattern. , A luminance gain having a large value (here, an absolute value) is set. On the other hand, when the value on the horizontal axis is not close to the value on the vertical axis, the difference (absolute value) between them is large, and it is determined that the image of the image signal being processed is an image having a predetermined pattern, A luminance gain having a small value (here, an absolute value) is set.

  Here, the information of the graph shown in FIG. 5 may be set in the determination circuit 251 as information such as an LUT. In this case, the determination circuit 251 sets, as the determination result signal for the luminance gain calculation circuit 252, the luminance gain setting method (luminance determined based on the graph information, the input Y signal of the current pixel, and the filtering result signal). A signal including a gain value is output. Then, the luminance gain calculation circuit 252 sets the luminance gain based on the input determination result signal (how to set the luminance gain).

In the example of FIG. 5, different brightness gains are set for each of two types of regions such as a region sandwiched between the two characteristics 2011 and 2012 and another region. However, as another configuration example, each of three or more types of regions is set. Different brightness gains may be set.
As another configuration example, a continuously changing value may be set as the luminance gain based on the difference between the Y signal of the current pixel and the signal of the filtering result.

[Distortion in image display]
FIG. 6 is a diagram illustrating an example of black characters in white according to the embodiment (first embodiment) of the present invention.
FIG. 7 is a diagram illustrating an example of display contradiction.
In the example of FIG. 6, a black character “TUV” is displayed on a white background.
In the example of FIG. 7, in the display shown in FIG. 6, the back parts 3011 to 3013 (parts where the backs are generated) are displayed near the black characters “TUV”.
In contrast, the image processing unit 31 according to the present embodiment can suppress the occurrence of such a contradiction.
In the present embodiment, the contradiction that occurs when a black character is displayed on a white background is shown. However, as another example, when a character or the like is displayed on the background, the background gradation and the character are displayed. If the gradations are different, a contradiction may occur.

[Summary of First Embodiment]
As described above, in the image processing unit 31 (image processing apparatus) in the projector 11 according to the present embodiment, when a pattern of black characters or the like is a predetermined pattern in white and the image to be processed has the predetermined pattern By suppressing (decreasing) the correction gain in the detail enhancer (in the example of FIG. 5, the luminance gain), display disagreement (image blur) due to correction is suppressed. Thereby, in the image processing part 31 (image processing apparatus), when the image which has patterns, such as a black character, is displayed on a white background, the image displayed can be improved.

  In the present embodiment, in the luminance signal correction amount calculation circuit 132, the determination circuit 251 and the luminance gain calculation circuit 252 are provided as separate bodies. However, as another configuration example, these may be integrally provided.

Further, in the present embodiment, filtering is performed using pixel blocks of three types such as (vertical 7 pixels × horizontal 7 pixels), (vertical 5 pixels × horizontal 5 pixels), and (vertical 3 pixels × horizontal 3 pixels). However, as another configuration example, filtering may be performed using one or more types of pixel blocks having an arbitrary size.
In the present embodiment, whether the image of the image signal is an image having a predetermined pattern using the smallest pixel block among a plurality of types (three types in the present embodiment) of pixel blocks. However, as another configuration example, it may be determined whether the image of the image signal is an image having a predetermined pattern using the second and subsequent smaller pixel blocks.

In the present embodiment, for a pixel block having a size of (vertical 3 pixels × horizontal 3 pixels), whether or not the image of the image signal is provided with one filter circuit 151-3 and the image of the image signal has a predetermined pattern. However, as another configuration example, the size of the pixel block used for this determination may be other sizes. As an example, the size of the pixel block used for this determination may be (vertical 5 pixels × horizontal 5 pixels). Note that the size of the pixel block used for this determination is preferably small to some extent. For example, the number of pixels equal to or less than Z (Z is a predetermined value) percent (%) in the vertical and horizontal directions with respect to the number of pixels of the entire image. For example, when the number of pixels of the entire image is (vertical 1000 pixels × width 1000 pixels), the number of pixels of the pixel block is (vertical 10Z pixels × The number of pixels may be less than or equal to 10Z (horizontal).
In the present embodiment, it is determined whether the image of the image signal is an image having a predetermined pattern using the filtering result of one filter circuit 151-3. It may be determined whether or not the image of the image signal is an image having a predetermined pattern by using the filtering results obtained by the number of filter circuits. As an example, a configuration that selects a filtering result to be used for determination from filtering results by two or more filter circuits, or a configuration that uses a result obtained by averaging two or more filtering results by two or more filter circuits Etc. may be used.
Further, in this embodiment, it is determined whether or not the image of the image signal is an image having a predetermined pattern using one pixel (in this embodiment, the current pixel). You may determine whether the image of an image signal is an image which has a predetermined pattern using two or more pixels. As an example, a configuration that selects a pixel to be used for determination from two or more pixels, or a configuration that uses a result of averaging pixel values of two or more pixels may be used.

For the image of the image signal to be processed (entire image), for example, an image having the same number of vertical pixels and the same number of horizontal pixels may be used, or the number of vertical pixels and the horizontal number of pixels may be used. An image having a different number of pixels may be used.
Further, as the pixel block to be filtered, for example, a pixel block having the same number of vertical pixels and the same number of horizontal pixels may be used, or the number of vertical pixels and the number of horizontal pixels are different. Pixel blocks may be used.

  In the present embodiment, the image of the image signal is an image having a predetermined pattern based on the Y signal of the current pixel and the averaging result of the Y signal in a pixel block having a plurality of pixels centered on the current pixel. As another configuration example, based on the Y signal of the current pixel and the averaging result of the Y signal in a pixel block having a plurality of pixels other than the center of the current pixel, It may be determined whether the image is an image having a predetermined pattern.

(Second Embodiment)
In the present embodiment, a projector having a configuration different from that of the projector 11 according to the first embodiment is shown.
Compared with the projector 11 according to the first embodiment, the projector according to the present embodiment includes a luminance signal correction amount calculation circuit 311 illustrated in FIG. 8 instead of the luminance signal correction amount calculation circuit 132 illustrated in FIG. 3. .
In this embodiment, regarding the projector, for convenience of explanation, components other than the components of the luminance signal correction amount calculation circuit 311 shown in FIG. 8 are denoted by the same reference numerals as in the first embodiment.

FIG. 8 is a diagram showing a schematic configuration example of the luminance signal correction amount calculation circuit 311 according to the embodiment (second embodiment) of the present invention.
In the luminance signal correction amount calculation circuit 311 according to the present embodiment, the determination result signal output from the determination circuit 351 is weighted (not the luminance gain calculation circuit) as compared with the luminance signal correction amount calculation circuit 132 illustrated in FIG. This is the same except that it is used by the calculation circuit 352. In the present embodiment, the luminance signal correction amount calculation circuit 311 will be described mainly regarding differences from the luminance signal correction amount calculation circuit 132 according to the first embodiment, and the luminance signal correction amount calculation circuit 132 according to the first embodiment will be described. A description of the same points as in FIG.

The luminance signal correction amount calculation circuit 311 includes three multipliers 331-1 to 331-3, one adder 332, a determination circuit 351, a weighting calculation circuit 352, and a luminance gain calculation circuit 371. A device 372 is provided.
The filtering result signal output from the filter circuit 151-1 is input to the multiplier 331-1 and the weight calculation circuit 352.
The filtering result signal output from the filter circuit 151-2 is input to each of the multiplier 331-2 and the weight calculation circuit 352.
The filtering result signal output from the filter circuit 151-3 is input to the multiplier 331-3 and the weighting calculation circuit 352, respectively.
Further, the filtering result signal output from the filter circuit 151-3 is input to the determination circuit 351.
Further, the Y signal output from the current pixel memory 112 is input to the determination circuit 351.
Further, the Y signal output from the line memory 111 is input to the luminance gain calculation circuit 371.

  The determination circuit 351 determines whether the image of the image signal being processed has a predetermined pattern based on the filtering result signal input from the filter circuit 151-3 and the Y signal of the current pixel. A signal representing the determination result (determination result signal) is output to the weight calculation circuit 352.

  The weighting calculation circuit 352 is output from the filter circuit 151-1 based on the filtering result signals output from the three filter circuits 151-1 to 151-3 and the determination result signal input from the determination circuit 351. The weighting coefficient for correcting the signal to be corrected, the weighting coefficient for correcting the signal output from the filter circuit 151-2, and the weighting coefficient for correcting the signal output from the filter circuit 151-3 are calculated. The weighting calculation circuit 352 outputs a signal (weighting coefficient signal) indicating the weighting coefficient calculated for the signal output from the filter circuit 151-1 to the multiplier 331-1, and the signal output from the filter circuit 151-2. Is output to the multiplier 331-2 and is multiplied by the signal (weighting coefficient signal) indicating the weighting coefficient calculated for the signal output from the filter circuit 151-3. To the device 331-3.

Here, when the weight calculation circuit 352 determines that the image of the image signal being processed is not an image having a predetermined pattern based on the determination result signal input from the determination circuit 351, the weight input calculation circuit 352 is input. Based on the three filtering result signals, three weighting coefficient signals corresponding to these signals are output to the respective multipliers 331-1 to 331-3. Here, in the weighting calculation circuit 352, for example, correspondence between three input filtering result signals and three weighting coefficient signals to be output at that time is set in advance in the LUT or the like. Is referenced.
On the other hand, if the weight calculation circuit 352 determines that the image of the image signal being processed is an image having a predetermined pattern based on the determination result signal input from the determination circuit 351, this is not the case. Compared to the case where the determination is made, the weighting coefficient signal that decreases the value (here, absolute value) of the signal output from the adder 332 is output to each multiplier 331-1 to 331-3. As a result, when the three filtering result signals input to the weight calculation circuit 352 are the same, the image of the image signal being processed is an image having a predetermined pattern; In comparison, the value of the signal output from the adder 332 (here, the absolute value) is small. As a result, the absolute value of the luminance signal correction amount signal output from the multiplier 372 is reduced, and the degree of influence of the luminance signal correction amount signal is reduced.

  For the three weighting coefficient signals output from the weighting calculation circuit 352, as the weighting coefficient signals that reduce the value (here, absolute value) of the signal output from the adder 332, for example, Three weighting factor signals having smaller values (here, absolute values) may be used, or other aspects may be used.

The multiplier 331-1 multiplies the filtering result signal input from the filter circuit 151-1 by the weighting coefficient signal input from the weighting calculation circuit 352, and outputs the multiplication result signal to the adder 332. To do.
The multiplier 331-2 multiplies the filtering result signal input from the filter circuit 151-2 by the weighting coefficient signal input from the weight calculation circuit 352, and outputs the multiplication result signal to the adder 332. To do.
The multiplier 331-3 multiplies the filtering result signal input from the filter circuit 151-3 by the weighting coefficient signal input from the weighting calculation circuit 352, and outputs the multiplication result signal to the adder 332. To do.
The adder 332 adds the signals input from the three multipliers 331-1 to 331-3 and outputs a signal resulting from the addition to the multiplier 372.

The luminance gain calculation circuit 371 receives the Y signal from the line memory 111. The luminance gain calculation circuit 371 calculates a luminance gain based on the Y signal input from the line memory 111 and outputs a signal (luminance gain signal) representing the calculated luminance gain to the multiplier 372. Here, in the luminance gain calculation circuit 371, for example, the correspondence between the input luminance signal and the luminance gain signal to be output at that time is set in advance in the LUT or the like, and the correspondence is referred to.
The multiplier 372 multiplies the addition result signal input from the adder 332 by the luminance gain signal input from the luminance gain calculation circuit 371, and the multiplication result signal is used as a luminance signal correction amount signal (VA signal). ) To the luminance signal correction circuit 133.

  Here, in the example of FIG. 5 in the first embodiment, the graphs (characteristics 2011 and 2012) for determining the luminance gain based on the Y signal of the current pixel and the signal of the filtering result are shown. In the present embodiment, In place of the luminance gain, a weighting coefficient is used. In the present embodiment, the three weighting factors may be set (determined) using the same characteristic or may be set (determined) using different characteristics.

[Summary of Second Embodiment]
As described above, the image processor 31 (image processing apparatus) in the projector 11 according to the present embodiment can obtain the same effects as those of the first embodiment.

  In the present embodiment, the luminance signal correction amount calculation circuit 311 includes the determination circuit 351 and the weighting calculation circuit 352 as separate units, but these may be integrated as another configuration example.

[Summary of the above embodiments]
As one configuration example, an image processing apparatus that corrects an image signal (in the example of FIG. 1, an apparatus having the function of the image processing unit 31), and a filter unit that performs filtering on the luminance signal of the image signal (FIG. 2). In the example of FIG. 2, a luminance signal correction amount calculation unit (in the example of FIG. 2, in the example of FIG. 2, the luminance signal) calculates the correction amount of the luminance signal of the image signal based on the result of filtering performed by the multistage filter circuit 131). Correction amount calculation circuit 132), a luminance signal correction unit (in the example of FIG. 2, luminance signal correction circuit 133) that corrects the luminance signal of the image signal using the correction amount calculated by the luminance signal correction amount calculation unit, and . The filter unit has at least one filter (filter circuit 151-3 in the example of FIG. 2) that averages the luminance signal of the image signal with respect to the pixel block, and the luminance signal correction amount calculation unit Adjusts the correction amount based on the value of at least one pixel and the result of filtering by the at least one filter on the pixel block including the pixel.
As an example of the configuration, in the image processing apparatus, the luminance signal correction amount calculation unit associates a combination of a value of at least one pixel and a filtering result by at least one filter with information for adjusting the correction amount. The correction amount is adjusted based on the correspondence and the combination.
As an example of the configuration, in the image processing apparatus, at least one filter (the filter circuit 151-3 in the example of FIG. 2) has a characteristic of averaging pixel values included in the pixel block.
As an example of the configuration, in the image processing apparatus, the filter unit includes a plurality of filters corresponding to a plurality of pixel blocks having different sizes, and the luminance signal correction amount calculation unit is other than the maximum among the plurality of filters. Filter corresponding to a pixel block of size (in the example of FIG. 2, a pixel block of (vertical 7 pixels × horizontal 7 pixels), (vertical 5 pixels × horizontal 5 pixels), (vertical 3 pixels × horizontal 3 pixels)). The correction amount is adjusted based on the result of filtering by.
As an example of the configuration, in the image processing apparatus, the luminance signal correction amount calculation unit corresponds to the smallest pixel block among the plurality of filters (in the example of FIG. 2, a pixel block of (vertical 3 pixels × horizontal 3 pixels)). Adjust the correction amount based on the result of filtering by the filter
As an example of the configuration, in the image processing apparatus, the luminance signal correction amount calculation unit has an absolute value of a difference between a value of one pixel and a result of filtering by one filter for the pixel block including the pixel. When the predetermined threshold value is exceeded, adjustment is made so that the degree of influence of the correction amount is smaller than when the threshold value is not.
As one configuration example, an image display device (in the example of FIG. 1, a projector 11) that displays an image based on an image signal, the image processing device that corrects the image signal, and the image signal that is corrected by the image processing device An image display device including an image display unit (in the example of FIG. 1, a projection unit 32) that displays an image based on the above.

Note that a method (image processing method) for executing processing similar to the processing performed by the above-described image processing apparatus may be performed.
In addition, a method (image display method) for executing a process similar to the process performed by the image display device may be performed.

  Note that a program for realizing the function of an arbitrary component in the above-described apparatus (for example, an apparatus corresponding to the image processing unit 31) is recorded (stored) in a computer-readable recording medium (storage medium). The program may be loaded into a computer system and executed. The “computer system” here includes an operating system (OS) or hardware such as peripheral devices. The “computer-readable recording medium” means a portable medium such as a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a CD (Compact Disc) -ROM, or a hard disk built in a computer system. Refers to the device. Further, the “computer-readable recording medium” means a volatile memory (RAM: Random Access) inside a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. Memory that holds a program for a certain period of time, such as Memory).

In addition, the above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the functions described above. Further, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.
For example, the image processing unit 31 (image processing apparatus) according to the present embodiment may be applied to an apparatus other than a projector, or may be applied to image processing in a liquid crystal television or a plasma television.

DESCRIPTION OF SYMBOLS 1 ... Image display system, 11 ... Projector, 12 ... Screen, 31 ... Image processing part, 32 ... Projection part, 111, 113 ... Line memory, 112 ... Current pixel memory, 131 ... Multistage filter circuit, 132, 311 ... Luminance signal Correction amount calculation circuit, 133 ... Luminance signal correction circuit, 134 ... Color difference gain calculation circuit, 135 ... Color difference signal correction circuit, 151-1 to 151-3 ... Filter circuit, 211-1 to 211-3, 253, 313-1 331-3, 372 ... multiplier, 212, 332 ... adder, 231, 352 ... weighting calculation circuit, 251, 351 ... determination circuit, 252, 371 ... luminance gain calculation circuit, 1011, 1021 ... pixel, 2011-2012 ... Characteristics, 3011-3013 ... Travel

Claims (9)

An image processing apparatus for correcting an image signal,
A filter unit for filtering the luminance signal of the image signal;
A luminance signal correction amount calculation unit that calculates a correction amount of the luminance signal of the image signal based on a result of filtering performed by the filter unit;
A luminance signal correction unit that corrects the luminance signal of the image signal using the correction amount calculated by the luminance signal correction amount calculation unit;
The filter unit has at least one filter that averages the pixel block with respect to the luminance signal of the image signal,
The luminance signal correction amount calculation unit adjusts the correction amount based on a value of at least one pixel and a result of filtering by the at least one filter on the pixel block including the pixel.
Image processing device. The luminance signal correction amount calculation unit has a correspondence between a combination of a value of the at least one pixel and a filtering result by the at least one filter and information for adjusting the correction amount, Adjusting the correction amount based on the correspondence and the combination;
The image processing apparatus according to claim 1. The at least one filter has a characteristic of averaging values of pixels included in the pixel block;
The image processing apparatus according to claim 1. The filter unit has a plurality of filters corresponding to a plurality of pixel blocks of different sizes,
The luminance signal correction amount calculation unit adjusts the correction amount based on a result of filtering by a filter corresponding to a pixel block having a size other than the maximum among the plurality of filters.
The image processing apparatus according to any one of claims 1 to 3. The luminance signal correction amount calculation unit adjusts the correction amount based on a result of filtering by a filter corresponding to the smallest pixel block among the plurality of filters.
The image processing apparatus according to claim 4. When the absolute value of the difference between the value of the one pixel and the result of filtering by the one filter on the pixel block including the pixel exceeds a predetermined threshold, the luminance signal correction amount calculation unit Is adjusted so that the degree of influence of the correction amount is smaller than in the case where this is not the case,
The image processing apparatus according to any one of claims 1 to 5. An image display device that displays an image based on an image signal,
The image processing apparatus according to claim 1, wherein the image signal is corrected.
An image display unit for displaying an image based on the image signal corrected by the image processing device;
An image display device. An image processing method for correcting an image signal,
The filter unit performs filtering on the luminance signal of the image signal,
The luminance signal correction amount calculation unit calculates a correction amount of the luminance signal of the image signal based on the result of filtering performed by the filter unit,
The luminance signal correction unit corrects the luminance signal of the image signal using the correction amount calculated by the luminance signal correction amount calculation unit,
The filter unit includes at least one filter that averages the pixel signal with respect to the luminance signal of the image signal;
The luminance signal correction amount calculation unit adjusts the correction amount based on a value of at least one pixel and a result of filtering by the at least one filter on the pixel block including the pixel.
Image processing method. An image display method for displaying an image based on an image signal,
The image display unit displays an image based on the image signal corrected by the image processing method according to claim 8.
Image display method.

Images