JP2001069373A - Digital picture data correcting method, information device and video telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a correcting method capable of reducing noise to naturalize and smoothen the variation of colors without necessitating a fast and large- capacity memory and correcting brightness at need for improvement of picture by adding and correcting higher-harmonic components to original digital image data. SOLUTION: Higher-harmonic components having at least two different luminance correcting values are added to original digital image data by each color component for correction. In an information device, e.g. a video correcting part 3 executes processing by the unit of pixels and writes data to be displayed in a displaying memory 5. Then, the part 3 adds the higher-harmonic components to the respective color components (luminance value) of RGB constituting pixels to periodically vary them. At the time of deciding a parameter for this correction, information from a distance sensor 1 can be utilized, and the degree of varying the luminance value of the respective color components of RGB of the pixels and the degree of varying a period are decided based on this.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting digital image data which can improve the image quality of a digital image obtained by digitizing a video signal from a television or a VTR or a digital image taken by a digital camera. The present invention relates to an information device and a videophone system.

[0002]

2. Description of the Related Art Images such as video signals from televisions and VTRs, photo images, etc., taken by cameras are not artificially colored by humans or computers as in animations. Such digital images of analog video have various problems such as blurred edges, blurred colors, darkness of the entire screen, and noise. In particular, in the case of a liquid crystal display device, pixels are often rectangular, and the edges are clearer than that of a CRT. Therefore, in addition to the above problems, the color change method is not smooth, and the display quality is poor. There is also the problem of falling. This problem in the liquid crystal display device is considered to be caused by display methods such as the number of colors, color space, dot pitch, arrangement of dots, and reaction speed.
Has also been pointed out.

[0003] As a method of improving the image quality for them,
In general, a combination of brightness correction such as gamma correction, correction for eliminating blur and color bleed based on peripheral pixels, band control using a frequency filter, and the like is often used.

However, when such processing is performed on a digital image of an analog video signal, a memory area such as a line buffer or a conversion table is required.
Further, in order to obtain a plurality of image quality improvement effects on an image, it is necessary to use the above-mentioned conventional techniques in combination, and if these are performed one by one in order, there is a problem that the processing speed becomes slow.

On the other hand, as an example of performing a plurality of processes at the same time, Japanese Patent Application Laid-Open No. 5-252420 discloses an image feature by band limitation in order to remove noise which is emphasized at the time of contour enhancement. A technique of performing image processing after performing extraction processing is disclosed.

[0006]

However, Japanese Patent Laid-Open Publication No.
The technique disclosed in Japanese Patent No. 52420 is not particularly limited to a liquid crystal display device, and cannot always solve the deterioration of display image quality caused by a sharp edge in the liquid crystal display device. In other methods, as described above, a line buffer, a conversion table, and the like are required, and the memory area is consumed. Further, when performing image feature extraction as preprocessing, processing for reducing the processing speed is added.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and reduces noise, makes color change natural and smooth without requiring a large amount of memory at high speed, , A digital image data correction method that can correct brightness and improve image quality as needed,
It is an object to provide an information device and a videophone system.

[0008]

According to the digital image data correcting method of the present invention, high frequency components having at least two or more different luminance correction values are added to original digital image data for each color component. Correction, thereby achieving the above objectives.

The high-frequency components may be arranged so that each luminance correction value has a periodic regularity in at least one of the horizontal direction and the vertical direction of the original digital image data.

The high-frequency component may have a uniform cycle length for each luminance correction value.

[0011] The high-frequency component is different in the start position of the arrangement of the luminance correction values between the adjacent color components.
It may be the same for every color component.

The high-frequency component may be added only when the luminance value of the original digital image data is within a certain range.

The distance from the imaging section to the subject may be measured, and the luminance correction value to be added and corrected to the original digital image data may be changed according to the measured distance.

The distance from the observer to the screen may be measured, and the luminance correction value to be added and corrected to the original digital image data may be changed according to the measured distance.

The information device of the present invention corrects the original digital image data using the digital image data correction method of the present invention, and displays the corrected image data.
Thereby, the above object is achieved.

An information device according to the present invention corrects original digital image data using the digital image data correcting method of the present invention, stores the corrected image data,
Thereby, the above object is achieved.

A video telephone system according to the present invention measures a distance from an image pickup unit to a subject, and transmits first digital image data of a photographed image and a measured distance, and the first information device. Receiving the original digital image data and the measurement distance transmitted from the device,
The corrected digital image data is corrected by changing the luminance correction value to be added and corrected according to the measured distance by the digital image data correction method according to any one of claims 1 to 5. Second to display data
And the above-described object is achieved.

A video telephone system according to the present invention measures a distance between a viewer and a screen from a first information device for transmitting original digital image data, and transmits the data from the first information device. Receiving the original digital image data, and changing the luminance correction value to be added and corrected according to the measured distance by the digital image data correction method according to any one of claims 1 to 5. A second information device device that corrects the digital image data of and displays the corrected image data,
Thereby, the above object is achieved.

The operation of the present invention will be described below.

According to the present invention, the original digital image data has (1) at least two or more different luminance correction values, and (2) each luminance correction value is in the horizontal direction of the original digital image data. And (3) high-frequency components for which the cycle length is uniform for each luminance correction value, for each color component. Add and correct. This makes it possible to improve the S / N ratio and correct the brightness by smoothing the appearance of the color change by the human visual characteristics.

Generally, the number of color components is one or three, and it is considered to be the same now and in the future. When the number of color components is one, there are no adjacent color components, but the number of color components is three.
In the case of (R, G, B), since the number of color components is an odd number, if the start position of the arrangement of the luminance correction values is different for each adjacent component and the same for every other color component, the adjacent dots The UP / DOWN regularity is given to the correction processing (for each light emitting element). Therefore, not only the color components but also the brightness (brightness) of the adjacent dots can make the change look smoother. Note that the brightness correction value is preferable since the correction cycle is the shortest when the brightness correction value is binary.
In this case, the arrangement of the luminance correction values for adjacent color components may be reversed.

When the luminance value is close to the MAX value or when the luminance value is 0
When the high frequency component is added and corrected, it appears to the human eye that some color appears in a portion close to black or white. In order to prevent this, the high-frequency component may be added only when the luminance value of the original digital image data is within a certain range.

In a digital camera, a videophone system, or the like, the image quality of original image data (photographed data) deteriorates as the distance from the imaging unit to the subject increases. In a videophone system or a display device, an image looks more vague as the distance from the observer to the screen is longer. Therefore, when these distances are long, in order to perform higher luminance correction processing, the distances are measured, and the luminance correction value to be added and corrected to the original digital image data is changed according to the measured distance. You may. In the videophone system, the transmission side can perform correction processing on the imaging distance, but the reception side can perform correction processing on both the imaging distance and the observation distance in a unified manner.
The speed can be further increased because it only needs to be performed once.

[0024]

Embodiments of the present invention will be described below.

In the present invention, correction is performed by adding a high-frequency component to the original digital image data for each color component. Note that “high” in the high-frequency component indicates that the cycle width is very narrow, and is at most about several dots (one digit pixel). The cycle width depends on the number of pixels and the size of the display device, but is preferably about 1 to 2 pixels that are difficult for human eyes to determine.

For example, in a liquid crystal display device, one pixel (one dot) is composed of three (R, G, B) color components as shown in FIG. 1A and its enlarged view, FIG. 1B. It is composed of The size of each color component indicates brightness, and is generally called a luminance value. Note that this pixel arrangement is an example, and the RGB arrangement may be a delta arrangement or a stripe arrangement.

FIG. 2 shows one line of an image.
7 is a diagram illustrating luminance values of an R component (red component).
The present invention uses the following high-frequency components when performing a luminance value correction process on individual dots of such digital image data.

(1) A high-frequency component having at least two or more different luminance correction values is added for each color component. For example, in FIG. 3A, Pa and Pb are different luminance correction values.
Each brightness correction value may be any of a positive value, a negative value, and a zero value as long as the values are different.

(2) Each luminance correction value may be arranged with a periodic regularity in at least one of the horizontal and vertical directions of the original digital image data. For example, when the luminance correction values are binary as shown in FIG. Further, Pa1, Pa2, Pb in FIG.
2. When the brightness correction value is 3 or more as in Pb1, the brightness values are arranged with a periodic regularity and appear in that order.

(3) The period length may be uniform for each luminance correction value. For example, as shown in FIG.
If the value of b is uniform, the correction unit (dot) may not be 1, but the smaller the cycle length, the more preferable it is because the color change can be smoothed. Therefore, 1
It is preferable that the number of pixels is about two or two pixels.

Furthermore, if the starting position of the arrangement of the luminance correction values is made different for adjacent color components and the same for every other color component, the UP / DOWN regularity can be given to the correction processing of the adjacent dots. More effective. For example,
FIG. 4 shows a high-frequency component example 1 shown in FIG. Here, the R component and the B component (blue component) start from Pa as shown in FIGS. 4A and 4C, and the G component (green component) starts from Pb as shown in FIG. 4B.
, And the arrangement of the luminance correction values in the adjacent color components is reversed.

For example, when the addition correction is performed on the original digital image data shown in FIG. 2 by the high frequency component example 1 shown in FIG. 3A, the result is as shown in FIG. In this manner, a fixed amount (Pa = −Pb, P
a> 0), the luminance becomes P with a probability of 1/2.
a is corrected to the increased or decreased digital image data. This makes it possible for image data taken with a low-precision camera, image data taken from a distant background, or image data subjected to enlargement processing to be such that “the same color is continuous as a whole” or “neighboring colors are almost the same. The image quality can be improved when the display state is such as "the image becomes dark" or "the whole image looks dark" or "there is no sharp change in color".

In the original digital image data shown in FIG. 2, the portion A is almost in a state where the luminance value = 0.
In general, the color is dark (black) depending on other G component and B component. In addition, the brightness value of the B portion =
It is in a state close to the MAX value and has a very bright color (white, R
The components are in a bright red state.
For the original digital image data, FIG.
When addition correction is performed according to the high-frequency component example 1 shown in FIG. 7A, the luminance of the part A increases by Pa with a probability of 1/2, and the luminance of the part B decreases by Pa with a probability of 1/2. Will be corrected. In this case, UP / DO is performed in one dot cycle.
Since the WN regularity is given, a part of the part A, which was almost black when viewed by the human eyes, has some shadow (color), and a part of the part B, which is almost white, has some shadow (color). Looks like. Therefore, in practice, it is preferable to preliminarily define a range (Pmax, Pmin) to which the high-frequency component is added, and to perform correction only on the luminance value within the range.

Hereinafter, this correction processing will be described with reference to an example.

FIG. 6A is a part of the luminance value of the R component for one horizontal line of an image. In this figure, the horizontal axis is the x coordinate with the right being positive, and the vertical axis is the luminance value with the upper being positive. In this figure, in the portion shown in (1), the color change is not smooth, and the change in luminance value is abrupt.

Therefore, for this luminance value A, B in FIG.
A high frequency component as shown in FIG. This high frequency component B
Has the cycle in the x direction set to twice the minimum unit (d in FIG. 6) constituting a pixel of the display screen.

The sum of the luminance value A of the R component and the high frequency component B in FIG. 6 is as shown by the thin line in FIG. Note that the bold line in FIG. 7 is a direct copy of A in FIG. 6 for easy understanding of the figure. In FIG. 7, in a portion (1) where a minus pattern is added at a point where the brightness changes, and a portion (2) where a plus pattern is added, the brightness change when viewed microscopically is large.

Also, when viewed macroscopically, the state in which the luminance values of the R component are averaged is as shown by the bold line in FIG. 8, and the luminance change of the R component appears to be smooth. FIG.
The thin line represents the thin line portion of FIG. 7 as it is for easy understanding of the figure, and represents A + B in FIG.
In FIG. 8, in a portion (1) where a minus pattern is added at a point where the brightness changes, and a portion (2) where a plus pattern is added, the brightness change is smooth when viewed macroscopically. .

From the above results, it can be seen that the same effect can be obtained irrespective of the location where the luminance value changes and the phase of the high frequency component. When the original image is an analog image such as a video signal from a television or VTR photographed by a camera or a photo image, only one of R, G, and B protrudes extremely in the image, Is not reduced, and it is confirmed that the R, G, and B color components in the pixel are related to each other. Therefore, in FIG. 6, even when the minimum unit is not only the R component but also each component of RGB, the same effect can be obtained, and it can be said that the same effect can be obtained for the entire image. In order to add a similar high-frequency component in the y direction, the phases may be shifted between the even-numbered lines and the odd-numbered lines.

Hereinafter, embodiments of the present invention will be described in more detail.

(Embodiment 1) In this embodiment, an example in which the present invention is applied to an image photographed by a digital camera will be described.

FIG. 9 is a block diagram showing the configuration of the information equipment of the first embodiment. The information device includes a distance sensor 1 for measuring a distance to a subject, an image processing unit 2 for receiving an image (image data) from a camera and performing various processes, an image correction unit 3, and a storage device for recording the captured image. 4, a display memory 5 and a display device 6.

This information device operates as follows. First, the distance to the subject is measured by the distance sensor 1, and the data is sent to the image processing unit 2 and the video correction unit 3 via the image processing unit 2. The image processing unit 2 appropriately processes the video from the camera according to the data from the distance sensor 1 and the external state, and outputs digital image data composed of RGB to the video correction unit 3. The general processing performed by the image processing unit 2 includes, for example, luminance correction, contour correction, color tone correction, noise reduction, and the like.

The image correction unit 3 performs processing on a pixel-by-pixel basis.
The data to be displayed (display data) is written to the display memory 5. The display device 6 performs display based on the display data. When recording a video by the storage device 4, there are a case where the data processed by the image processing unit 2 is directly recorded and a case where the data corrected by the video correction unit 3 is recorded. . In the latter case, the storage device 4 receives data from the display memory 5 and stores it.

The processing in the video correction unit 3 will be described below.

On a liquid crystal display screen, especially when an image obtained by digitizing an analog video signal is displayed, the image is often recognized as an image without a smooth color change and sharpness. In order to improve such image quality,
In order to simultaneously reduce the noise and correct the brightness as necessary, the image correction unit 3 uses the RGB
A high-frequency component is added to each color component (luminance value) to change the color component periodically.

In determining parameters for this correction, information from the distance sensor 1 can be used.
Based on this, it is determined how much the luminance value of each of the RGB color components of the pixel is displaced, and at what cycle.

FIG. 10A is an image diagram assuming a screen of 640 pixels in width × 480 pixels in height. Here, a coordinate system is used in which the upper left is (0, 0), the x coordinate is positive on the right, and the y coordinate is positive on the lower. As shown in FIG. 10B in which four pixels around the origin (0, 0) in FIG. 10A are enlarged, one pixel is composed of RGB color components. In this figure, 101, 102, 103, and 104 each correspond to one pixel on the display screen, and each of the pixels 101, 102, 103, 1
04 R components 101R, 102R, 103R, 104
R, and G components 101G, 102G, 103G, 10
4G, and the B component is 101B, 102B, 103B, 1
04B.

The range of the luminance value of the RGB component is from 0 to 255.
The following parameters Pa and Pb (−255) are used to determine how much the luminance value of each of the RGB color components is displaced.
(Up to 255). These values are stored in advance in registers, and can be appropriately changed according to various conditions of the distance sensor 1 or the like, or can be used in combination, and can be three or more values.

As shown in FIG. 11, for each color component of RGB, Pa for 101R, Pb for 101G, 101
Pa for B, Pb for 102R, Pa for 102G, 1
Pb for 02B, Pb for 103R, P for 103G
a, Pb is added to 103B, Pa is added to 104R, Pb is added to 104G, and Pa is added to 104B. Then, when the added value exceeds 255, 255 is output, and when it is smaller than 0, 0 is output. Note that, in this figure, the hatched portion is a portion where Pa is added to the brightness value, and the portion without the hatched portion is a portion where Pb is added to the brightness value. In this way, different values (Pa and Pb) are alternately added for each column for each color component of RGB, and different values are alternately added for each row, so that different luminance values are added to adjacent color components. .

For example, when Pa> 0 and Pa = −Pb, the luminance values of the RGB components of all the pixels are
In the range of −Pa, the total sum of the luminance values of the RGB color components is guaranteed for the entire specified range, and the total sum of the luminance values of the corrected digital image data and the original digital image data becomes the same. . Actually, since the luminance values of the RGB components of all the pixels are not always in the range from Pa to 255-Pa, the total luminance value of the corrected digital image data and the original digital image data is calculated. In order to make the sum the same, it is desirable to previously determine the range (Pmax, Pmin) of the luminance value to be corrected. When Pa and Pb in the above conditions are changed to Pa> 0 and Pb = 0, it is possible to increase the luminance value by half of Pa on average when looking at each of the upper, lower, left, and right two pixels. Since it is possible, the brightness can be corrected.

Hereinafter, the processing in the video correction unit will be described with reference to the flowchart in FIG. Here, the range (the number of pixels) for performing the image correction is {x: 0 to 640},
Consider the case of {y: 0-480}.

First, in step 20, Pa, P
Set the values of b, Pmin and Pmax. The values of Pa and Pb are as described above, and the values stored in the registers in advance are substituted. Pmin and Pmax
Indicates the range of each of the RGB color components to be corrected, and the following correction processing is not performed on the luminance values outside this range.

Next, in step 21, flg _- y
And y are initialized so that flg _- y = 1 and y = 0. Note that flg _- x and flg _- y are flags indicating whether the column x and the row y are odd or even, and only one of 1 and -1 is substituted.

Next, in step 22, it is determined whether or not y has reached 480. If y has reached 480, the process is terminated. If y has not reached 480, the process proceeds to step 23. In step 23, the sign of flg _- y is inverted, and its value is substituted for flg _- x, so that x = 0.

Next, it is determined in step 24 whether x has reached 640, and if it has reached 640, y is incremented by one in step 25 and the process returns to step 22. If it has not reached 640, the process proceeds to step 26. In step 26, the values of the RGB components are substituted into the variables R, G, and B from the pixel data at the coordinates (x, y).

Next, at step 27, flg _- x
It is determined whether or not the value of -1 is -1. If it is -1, the process proceeds to step 28; otherwise, the process proceeds to step 29.

In step 28, Pmin and Pmax
Within the following range, the value of R is R + Pa, and the value of G is G + P
The values of b and B are B + Pa, and the values of R, G and B are 255
If the value becomes larger than 255, each value is set to 255, and if the value becomes smaller than 0, 0 is set to each value. Also, in step 29, Pmin or more and Pmax
Within the following range, the value of R is R + Pb, and the value of G is G + P
Let the values of a and B be B + Pb and the values of R, G and B be 255
If the value becomes larger than 255, each value is set to 255, and if the value becomes smaller than 0, 0 is set to each value.

Next, in step 30, the coordinates (x,
Replace each value of y) with the R, G, B values updated in step 28 or step 29. Next, step 31
Then, -flg _- x is substituted for flg _- x, x is incremented by one, and the process returns to step 24.

By such a correction process, in a display device in which the components of the pixels are arranged in the order of RGB and all pixels have the same arrangement in the vertical and horizontal directions, the luminance is finely changed in units of RGB components finer than the pixels. Therefore, it is possible to make the apparent color change smoother than an analog image before digitization, to make noise (noise) less noticeable, and to correct brightness as needed. Become. This image correction is particularly effective for a liquid crystal display device in which the manner of color change is not smooth due to digitization of an analog image. In a CRT, the change in color does not change because it is originally smooth.
The effect is obtained with respect to brightness and noise reduction.

In the case of performing the enlarged display, first, the image is simply enlarged, and then the image correction processing is performed to improve the S / N ratio with higher accuracy to make the color change natural. And the processing speed can be further increased.

(Embodiment 2) In this embodiment, an example of a videophone system will be described.

FIG. 13 is a block diagram showing a configuration of a videophone according to the second embodiment. This videophone system includes a distance sensor 1 for measuring a distance to an imaging target, an image processing unit 2 for taking in an image (image data) from a camera and performing various processes, an image correction unit 3, a display memory 5, a display device. 6 and a camera 7. Distance sensor 1
Is installed so that the distance from the user who views the display image to the display device 6 can be measured.

Hereinafter, an example of transmitting data from A to B using the videophone will be described with reference to FIG.

On the transmitting side, first, the distance to the imaging target A is measured by the distance sensor 1, and the data is sent to the image processing unit 2. The image processing unit 2 appropriately processes the data from the camera 7 according to various information including the data from the distance sensor 1 and transmits the processed data including the distance data to the other party.

On the receiving side, first, the data transmitted by the image processing unit 2 'is received and sent to the video correction unit 3'. Further, the distance to the imaging target B is measured by the distance sensor 1 ', and the data is sent to the image correction unit 3'. The image correction unit 3 'corrects the received data and the data measured by the distance sensor 1' to an optimal image and sends the image to the display memory 5 '. The display device 6 'performs display based on the corrected image data.

As described above, at the time of transmission, the data captured by the camera 7 is transmitted without passing through the video correction unit 3, and at the time of reception, the video correction unit 3 'is determined by the distance between the display device 6' and the user B who sees it. , An appropriate correction can be made.
In the videophone system, transmission and reception are switched between A and B in a short time, and the same processing is performed even if transmission and reception are switched.

In this embodiment, the correction value is changed depending on the distance between the observer and the display device on the receiving side. Therefore, the ambiguity of the image data increases as the viewing distance increases. Larger correction processing is required. Basically, the luminance correction values Pa and Pb of the high frequency component are increased, but the period may be changed.

Also in the present embodiment, it is meaningful to change the luminance correction value (high-frequency component) according to the distance to the subject (transmitting side), as in the digital camera. This is because the ambiguity of captured and digitized image data increases as the distance from the imaging target increases. However, in the videophone system,
It is preferable to transmit both information of the imaging distance data and the captured image data and perform the correction processing on the receiving side, rather than performing correction on the imaging distance before transmission. The reason is that both the correction processing for the distance to the imaging target and the correction processing for the viewing distance can be unified and processed on the receiving side. Further, on the receiving side, processing can be performed using a table for determining a correction value based on, for example, “distance of imaging target + viewing distance”. Can be simplified on the receiving side based on the viewing distance, and the speed performance of the entire system can be improved. Note that a specific correction process in the video correction unit 3 'can be performed in the same manner as in the first embodiment.

[0070]

As described in detail above, according to the present invention,
By adding and correcting high-frequency components to original digital image data such as video from TV or video, video captured by a camera, etc., smoothing the appearance of color changes in real time and reducing noise, The image quality can be improved by correcting the brightness as needed. In addition, the image quality can be improved by performing a correction process on the image data once stored in the external recording device by ordinary means.

Further, by appropriately selecting the luminance correction value (Pa, Pb, etc.), it is possible to achieve high image quality without changing the luminance as a whole, or to achieve high image quality while correcting the luminance. is there.

Further, the image correction processing is performed for each pixel,
Moreover, the calculation can be performed without considering the influence of the surrounding pixels, and the processing is simple. Accordingly, high-speed processing can be performed without consuming memory unlike the related art.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of the arrangement of pixels in a liquid crystal display device.

FIG. 2 is a diagram illustrating an example of a luminance value for an R component of video data.

FIG. 3 is a diagram showing an example of a high-frequency component used in the present invention.

FIG. 4 is a diagram showing an example of a high-frequency component used in the present invention.

FIG. 5 is a diagram illustrating an example in which a high-frequency component is added and corrected to the luminance value of FIG. 2;

FIG. 6 is a diagram illustrating an example of a change in luminance value for an R component on a y-line on a screen.

7 is a diagram illustrating an example in which a high-frequency component is added and corrected to the luminance value in FIG. 6;

8 is a diagram showing a transition of an average value with respect to the luminance value of FIG. 7;

FIG. 9 is a block diagram illustrating a configuration of the information device according to the first exemplary embodiment.

FIG. 10 is a diagram showing pixels of a liquid crystal display screen and components thereof.

FIG. 11 is a diagram for explaining high-frequency components added to RGB color components in a pixel in the first embodiment.

FIG. 12 is a flowchart illustrating a correction process in a video correction unit.

FIG. 13 is a block diagram illustrating a configuration of a videophone according to a second embodiment.

FIG. 14 is a diagram for explaining a data flow in the videophone system according to the second embodiment.

[Explanation of symbols]

 1, 1 'Distance sensor 2, 2' Image processing unit 3, 3 'Image correction unit 4 Storage device 5 Display memory 6, 6' Display device 7, 7 'Camera

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 9/30 H04N 9/30 5C080 9/68 103 9/68 103Z (72) Inventor Yukio Okano Osaka, Osaka 22-22, Nagaike-cho, Abeno-ku, Sharp Corporation (72) Inventor Sadahiko Higami 22-22, Nagaike-cho, Abeno-ku, Osaka, Osaka Inside Sharp Corporation (72) Inventor Rui Sakuta Nagaike-cho, Abeno-ku, Osaka, Osaka No.22-22 Sharp Corporation F term (reference) 2H089 QA16 TA07 5C006 AA01 AA22 AF46 AF61 BB11 BF02 BF38 FA18 FA44 FA56 5C021 PA17 PA53 PA58 PA66 PA83 RA08 RB03 XB02 XB06 5C060 BA03 BA04 BB02 BC01 JA03 A066 CA06 CA07 CA17 EA07 EC02 EC11 EC12 EE01 GA01 GA24 GB01 HA02 JA03 KA08 KA12 KD04 KD06 KE02 KE16 KM13 LA02 5C080 AA10 BB05 CC03 DD05 DD 22 EE30 JJ02 JJ04 JJ05 JJ07

Claims (11)

[Claims] 1. A method for correcting digital image data in which high frequency components having at least two or more different luminance correction values are added to original digital image data for each color component for correction. 2. The high frequency component according to claim 1, wherein each of the luminance correction values is arranged with a periodic regularity in at least one of the horizontal direction and the vertical direction of the original digital image data. A method for correcting digital image data. 3. The digital image data correction method according to claim 1, wherein the high-frequency component has a uniform cycle length for each luminance correction value. 4. The high-frequency component is different between adjacent color components in the starting position of the arrangement of the luminance correction values between adjacent color components.
4. The same for every other color component.
The method for correcting digital image data according to any one of the above. 5. The digital image data correction method according to claim 1, wherein the high-frequency component is added only when the luminance value of the original digital image data is within a certain range. 6. A method for measuring a distance from an imaging unit to a subject,
6. The digital image data correction method according to claim 1, wherein a luminance correction value to be added and corrected to the original digital image data is changed according to the measured distance. 7. The method according to claim 1, wherein a distance from an observer to a screen is measured, and a luminance correction value to be added and corrected to the original digital image data is changed according to the measured distance. A method for correcting digital image data. 8. An information device for correcting original digital image data using the digital image data correction method according to claim 1, and displaying the corrected image data. 9. An information device which corrects original digital image data by using the digital image data correction method according to claim 1, and stores the corrected image data. 10. A first information device for measuring a distance from an imaging section to a subject and transmitting original digital image data and a measured distance, and a first information device transmitted from the first information device. The original digital image data and the measured distance are received, and the luminance correction value to be added and corrected is changed according to the measured distance by the digital image data correction method according to any one of claims 1 to 5. A second information device that corrects the original digital image data and displays the corrected image data. 11. A first information device for transmitting photographed original digital image data, and a distance from an observer to a screen is measured, and an original digital image transmitted from the first information device is measured. Receiving the data and correcting the original digital image data by changing the luminance correction value to be added and corrected according to the measured distance by the digital image data correction method according to any one of claims 1 to 5. And a second information device for displaying the corrected image data.