KR101357164B1 - Digital image processing apparatus, display method of the apparatus, and recording medium storing program to implement the display method - Google Patents

Abstract

The present invention provides a digital image processing apparatus having improved image visibility by displaying an image displayed on a display unit brightly even in a bright environment, a display method thereof, and a recording medium storing a program for executing the same. A display luminance determiner for determining a display luminance of an image to be displayed from data, a gamma curve correction unit for correcting a gamma curve according to the display luminance determined by the display luminance determiner, and a gamma curve modified at the gamma curve correction unit. The present invention provides a digital image processing apparatus, a display method thereof, and a recording medium storing a program for executing the same.

Description

Digital image processing apparatus, display method and recording medium storing program for executing the same

The present invention relates to a digital image processing apparatus, a display method thereof, and a recording medium storing a program for executing the same. More particularly, the image displayed on the display unit is displayed brightly even in a bright environment, thereby improving image visibility. The present invention relates to a digital image processing apparatus, a display method thereof, and a recording medium storing a program for executing the same.

In general, a digital image processing apparatus has a display unit for displaying an image. If the digital image processing apparatus has an imaging unit for photographing a subject, the display unit may display an image from an electrical signal generated by the imaging unit. If the digital image processing apparatus does not have an imaging unit, the display unit may display a stored or input image.

The environment for checking an image by displaying the image on the display unit using the digital image processing apparatus may be indoors or outdoors. Therefore, when checking the image by using the digital image processing apparatus, the ambient brightness may not be constant and may vary. Therefore, when the image is checked using the digital image processing device in a bright environment, the brightness of the image displayed on the display unit is relatively low compared to the surrounding brightness, so that the user cannot accurately identify the image displayed on the display unit. there was. In particular, when the image to be displayed brightly is displayed at a normal brightness in a state where the ambient brightness is bright, there is a problem that it is more difficult to check.

SUMMARY OF THE INVENTION The present invention has been made to solve various problems, including the above problems, a digital image processing apparatus having improved image visibility by displaying the image displayed on the display unit even in a bright environment, the display method and the execution thereof It is an object of the present invention to provide a recording medium storing a program for the purpose of storing the program.

The present invention provides a display brightness determiner for determining a display brightness of an image to be displayed from data of an image to be displayed, a gamma curve corrector for correcting a gamma curve according to the display brightness determined by the display brightness determiner, and the number of gamma curves. It provides a digital image processing apparatus comprising a display unit for displaying an image according to the gamma curve modified by the government.

The present invention also relates to a display brightness determining unit for determining display brightness of an image to be displayed from data of an image to be displayed, a display unit which is a liquid crystal display device for displaying an image, and a display brightness determined by the display brightness determining unit. It provides a digital image processing apparatus comprising a backlight brightness adjustment unit for adjusting the backlight brightness of the display unit.

According to another aspect of the present invention, there is further provided a luminance data extraction unit for extracting the luminance data from the data of the image to be displayed, wherein the display luminance determination unit, the display luminance of the image to be displayed from the luminance data extracted by the luminance data extraction unit Can be determined.

According to another feature of the invention, the luminance data extractor extracts Y data from the data of the image to be displayed, the display luminance determiner, the number of pixels or subpixels having a Y value of the upper 10% and lower 10 The display luminance of the image to be displayed may be determined according to the difference in the number of pixels or subpixels having a Y value of%.

According to another aspect of the present invention, the display luminance determiner may be displayed as the number of pixels or subpixels having a Y value of the upper 10% is greater than the number of pixels or subpixels having a Y value of the lower 10%. It can be decided that the display brightness of an image is high.

According to another feature of the present invention, the luminance data extractor may extract Y data from data of an image to be displayed, and the display luminance determiner may determine display luminance of an image to be displayed according to an average Y value. have.

According to another feature of the present invention, the display luminance determiner may determine that the display luminance of the image to be displayed is higher as the average Y value is larger.

According to another feature of the invention, the luminance data extractor extracts Y data from the data of the image to be displayed, the display luminance determiner, the number data of pixels or subpixels having each Y value for each Y value It is possible to determine the display luminance of the image to be displayed according to the Y value of the most pixels or sub-pixels by generating the.

According to another feature of the present invention, the display luminance determiner may have a higher display luminance of an image to be displayed as the Y value of the largest number of pixels or subpixels is larger.

According to another feature of the present invention, the higher the display brightness determined by the display brightness determiner, the gamma curve correction unit may be to modify the gamma curve so that the image displayed on the display is displayed brighter.

According to another feature of the present invention, the higher the display brightness determined by the display brightness determining unit, the gamma curve correction unit may be to modify the gamma curve so that the gamma value is smaller.

According to another feature of the present invention, as the display brightness determined by the display brightness determining unit is higher, the backlight brightness adjusting unit may adjust the backlight brightness of the display unit so that the image displayed on the display unit is displayed brighter. .

According to another feature of the present invention, the image to be displayed is a moving image, and the display luminance determining unit may determine the display luminance of the moving image to be displayed from the data of the first frame of the moving image to be displayed.

The invention also includes determining a display brightness of an image to be displayed from data of an image to be displayed, correcting a gamma curve according to the determined display brightness, and displaying an image according to the modified gamma curve. A display method of a digital image processing apparatus is provided.

The present invention also includes determining display brightness of an image to be displayed from data of an image to be displayed, adjusting a backlight brightness of the display unit according to the determined display brightness, and displaying an image on the display unit. A display method of a digital image processing apparatus is provided.

According to another aspect of the present invention, the method may further include extracting luminance data from data of an image to be displayed, and determining the display luminance may include determining display luminance of an image to be displayed from the extracted luminance data. It can be done.

The present invention also provides a recording medium storing a program for executing the above method.

According to the digital image processing apparatus of the present invention, a display method thereof, and a recording medium storing a program for executing the same, the image displayed on the display is brightly displayed even in a bright environment, thereby improving image visibility. The digital image processing apparatus, a display method thereof, and a recording medium storing a program for executing the same can be implemented.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a digital image processing apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the digital image processing apparatus according to the present exemplary embodiment includes a display luminance determiner 64, a gamma curve corrector 66, and a display 90. Of course, FIG. 1 further shows a memory 70, a storage / reading control unit 82, a storage medium 80, a display control unit 94, a CPU 100, and an operation unit 200. The invention is not limited thereto.

The overall operation of the digital image processing apparatus is governed by the CPU 100. [ The digital image processing apparatus is provided with an operation unit 200 including a key for generating an electrical signal from the user. An electrical signal from the operation unit 200 is transmitted to the CPU 100 so that the CPU 100 can control the digital image processing apparatus in accordance with an electrical signal.

The storage / reading control unit 82 stores the image data in the storage medium 80 or automatically reads the image data from the image file stored in the storage medium 80 according to a signal from the user, and stores the image data in the memory 70. An image may be displayed on the display unit 90 by inputting to the display control unit 94 through the display unit 90. Of course, unlike FIG. 1, various modifications are possible, such as the transfer of data as described above without passing through the memory 70. The memory 70 is a concept including a ROM or a RAM.

The display luminance determining unit 64 determines the display luminance of the image to be displayed from the image data read by the storage / reading control unit 82. The image data has YUV data for each pixel (subpixel), which is three pieces of information: a luminance signal Y, a difference between the luminance signal and the red component U, and a difference between the luminance signal and the blue component V. The display luminance determiner 64 determines the display luminance of the image to be displayed from the Y data which is the luminance signal. The gamma curve correction unit 66 corrects the gamma curve as described later in accordance with the display luminance determined by the display luminance determiner 64. When the gamma curve is corrected, the display unit 90 displays an image according to the gamma curve corrected by the gamma curve corrector 66.

As described above, the environment for confirming by displaying an image on a display unit using a conventional digital image processing apparatus may be indoors or outdoors. Therefore, when checking the image by using the digital image processing apparatus, the ambient brightness may not be constant and may vary. Therefore, when checking an image using a digital image processing device in a state where the surrounding brightness is bright, the brightness of the image displayed on the display unit is relatively low compared to the surrounding brightness, so that the user cannot accurately check the image displayed on the display unit. There was this. In particular, when the image to be displayed brightly is displayed at a normal brightness in a state where the ambient brightness is bright, there is a problem that it is more difficult to check.

However, in the display method of the digital image processing apparatus according to the present embodiment and the digital image processing apparatus employing the method, the display luminance determining unit 64 determines the display luminance of the image to be displayed from the data of the image and thus gamma The curve corrector 66 modifies the gamma curve and displays the image on the display unit 90 according to the modified gamma curve, thereby displaying the image at the display luminance appropriately determined by the display luminance determiner 64. ), You can increase the visibility of the image even if the ambient brightness is bright. Specifically, the display luminance determiner 64 determines a display luminance higher for an image that needs to be displayed brighter than a normal image, and the gamma curve correction unit 66 determines the display determined by the display luminance determiner 64. As the luminance is higher, the gamma curve is corrected so that the image displayed on the display unit 90 is displayed brighter. Therefore, the image that needs to be displayed brightly even though the ambient brightness is bright is displayed brightly on the display unit 90, and thus, the image visibility of the user can be dramatically increased.

On the other hand, the digital image processing apparatus according to the present embodiment determines the display brightness of the image to be displayed, and accordingly modify the gamma curve to display the image on the display unit 90 along the modified gamma curve to brighten the usage environment. Even if it increases the visibility of the displayed image. In this case, if the image to be displayed is not a moving image, the display brightness may be determined for each image to be displayed, and the gamma curve may be corrected accordingly to display the image on the display unit 90 along the modified gamma curve. If the image to be displayed is a moving image, the display luminance determiner 64 determines the display luminance of the moving image to be displayed from the data of the first frame of the moving image to be displayed and modifies the gamma curve accordingly to follow the modified gamma curve. The moving image (not just the first frame) may be displayed on the display unit 90. This is because the display luminance determiner 64 may change the display luminance for each frame of the moving image, and thus the user may feel uncomfortable if the luminance of the displayed moving image continues to change. Of course, the present invention is not limited thereto, and the gamma curve may be modified by determining the display luminance every frame, or by determining the display luminance at a predetermined time interval (for example, 5 seconds or 10 seconds) or at a constant frame interval. Many variations are possible, including the ability to modify the gamma curve.

2 is a block diagram schematically showing a digital image processing apparatus according to another embodiment of the present invention.

The difference between the digital image processing apparatus according to the present embodiment and the digital image processing apparatus according to the embodiment described above with reference to FIG. 1 is that the digital image processing apparatus further includes a luminance data extracting unit 62. The luminance data extractor 62 extracts luminance data from the data of the image to be displayed, and the display luminance determiner 64 determines the display luminance of the image to be displayed from the luminance data extracted by the luminance data extractor 62. .

The image data may have YUV data for each pixel (subpixel), which is three pieces of information: a luminance signal Y, a difference between the luminance signal and a red component U, and a difference between the luminance signal and a blue component V. If the image data has such data, the luminance data extractor 62 extracts Y data, which is a luminance signal, from the data and outputs the Y data to the display luminance determiner 64. If the image data does not have YUV data and has RGB data, the YUV data can be obtained from the RGB data according to the following equations (1) to (3).

Y = 0.3R + 0.59G + 0.11B

U = (B-Y) × 0.493

V = (R-Y) × 0.877

If the image data has RGB data instead of YUV data, the luminance data extracting unit 62 extracts Y data which is data relating to luminance according to Equation 1, and outputs the Y data to the display luminance determining unit 64. Of course, the luminance data extractor 62 and the display luminance determiner 64 may be integrated.

3 and 4 are graphs for explaining determining display brightness of an image to be displayed according to an embodiment of the present invention.

If the image to be displayed is not a moving image, the graphs of FIGS. 3 and 4 are graphs in which the number of pixels or sub-pixels having the y-axis and the y-axis the Y-axis is Y, and if the image to be displayed is a moving image, The y-axis of the graphs of FIGS. 3 and 4 is a graph of the number of pixels or subpixels having respective Y values in one frame. That is, as the number of pixels having a large Y value in the graphs of FIGS. 3 and 4 increases, this means that the image needs to be displayed brighter.

In the graph as shown in FIG. 3, the display luminance determiner 64 determines a difference between the number of pixels or subpixels having a Y value of the upper 10% and the number of pixels or subpixels having a Y value of the lower 10%. Accordingly, the display brightness of the image to be displayed can be determined. The number of pixels or subpixels having the Y value of the upper 10% is the width of the portion indicated by A _u in the graph of FIG. 3, and the number of the pixels or subpixels having the Y value of the lower 10% is the graph of FIG. 3. The area of the area denoted by A _l in. That is, the number of pixels or subpixels having the Y value of the upper 10% is an integral value in the region of the Y value of the upper 10% in the graph of FIG. 3, and the pixels or subpixels having the Y value of the lower 10% The number is the integral value in the region of the lower 10% Y value in the graph of FIG. 3.

As described above, as the number of pixels having a large Y value in the graph as shown in FIG. 3 increases, this means that the image needs to be displayed brighter. Therefore, the larger the number of pixels or subpixels having the Y value of the upper 10% than the number of the pixels or subpixels having the Y value of the lower 10%, the more the image needs to be displayed brighter. Therefore, the display luminance determiner 64 has a higher display luminance of an image to be displayed as the number of pixels or subpixels having a Y value of the upper 10% is greater than the number of pixels or subpixels having a Y value of the lower 10%. Can be determined.

Meanwhile, the display luminance of the image to be displayed may be determined based on a Y value other than the upper 10% Y value and the lower 10% Y value. For example, the display luminance determiner 64 may determine the display luminance of the image to be displayed according to the Y value of the average (the value indicated by Y _m in FIGS. 3 and 4). That is, the display luminance determiner 64 may determine that the display luminance of the image to be displayed is higher as the Y value Y _m of the average is larger. Here, the Y value of the average may be an average value (middle value) of the smallest Y value and the largest Y value extracted from the image data, taking into account the number of pixels or subpixels having each Y value in the Y value. It can also be an average value. In the case of the average value considering the number of pixels or subpixels having each Y value in the Y value, as shown in the graph of FIG. 4, the width of the portion indicated by A _L on the left side and the portion indicated by A _R on the right side are It can be the Y value of the same boundary point. The area of the area indicated by A _L on the left is the integral value in the region from the smallest Y value to the mean value (Y _m ), and the area of the area indicated by A _R on the right is the average value (Y _m ) to the largest Y It can be an integral value in the area.

In addition, the display luminance determiner 64 generates number data of pixels or subpixels having a respective Y value for each Y value, so as to display the number of pixels or subpixels of the image to be displayed according to the Y value of the largest number of pixels or subpixels. It is also possible to determine the display brightness. The Y value of the largest number of pixels or subpixels is the Y value (the value indicated by Y _p in FIG. 4) corresponding to the largest peak in the graphs as shown in FIGS. 3 and 4. That is, the display luminance determiner 64 may determine that the display luminance of the image to be displayed is higher as the Y value Y _p corresponding to the largest peak is larger.

When the gamma curve is corrected by modifying the gamma value according to the numerical reference Y value, for example, the reference Y value is divided into less than 6LV, more than 6LV, less than 10LV, more than 10LV, less than 12LV, and more than 12LV, so that the reference Y value has low luminance. For 6LV, which needs to be displayed, the gamma value is 3.4, if the reference Y value is 6LV or more and less than 10LV, the gamma value is 3.0; if the reference Y value is more than 10LV and less than 12LV, the gamma value is 2.2 and the reference Y value is When it is necessary to display at a luminance higher than 12LV, by modifying the gamma curve by setting the gamma value to 2.0, it is possible to change the luminance of the image as needed to significantly improve the user's image visibility.

5 is a graph schematically showing an example of a gamma curve correction according to an embodiment of the present invention. First, the gamma curve will be described as follows.

The output value for the input value in the display unit is typically a linear, i.e., a linear, nonlinear, nonlinear (linear) function as shown in FIG. In FIG. 5, the x-axis is grayscale data of the image signal input to the display unit, and the y-axis is the luminance represented by the display unit. If the output value for the input value on the display is linear, this graph should appear as a straight line, but this is not the case because the output value for the input value is not linear. However, since the image data obtained by the imaging unit is related to an electrical signal that senses light and is proportional thereto, when the image data obtained by the imaging unit is displayed on the display unit as it is, an image having a different gradation from the actual gradation is displayed on the display unit. Therefore, prior to displaying on the display unit, if the image data is inversely distorted in consideration of the nonlinear gamma curve of the display unit as shown in FIG. The image is displayed on the display. This is called gamma correction.

In the digital image processing apparatus according to the present exemplary embodiment, the gamma curve correction unit 66 corrects the gamma curve according to the display luminance determined by the display luminance determiner 64 as described above. Specifically, as the display brightness determined by the display brightness determining unit 64 is higher, the gamma curve correction unit 66 modifies the gamma curve so that the gamma (γ) value is smaller. FIG. 5 shows gamma curves when gamma values are 2.0, 2.2, 3.0, and 3.4, respectively. Even though grayscale data of the same interval from α to β is input, the range of luminance output according to each gamma curve is A1, It can be seen that they are different from A2, A3 and A4. In particular, in this case, when grayscale data of the same section is input, it can be seen that as the gamma value increases, the output luminance decreases. On the contrary, when grayscale data of the same section is input, the output luminance increases as the gamma value decreases. Therefore, if the gamma curve correction unit modifies the gamma curve so that the gamma curve correction unit is smaller as the display luminance determined by the display luminance determiner 64 is higher, the luminance is displayed higher in the case of an image that needs to display a larger luminance, so that the user may be able to see a bright environment. Image visibility can be improved. On the contrary, in the case of an image that needs to be displayed with low luminance (in the case of an image that may be displayed with low luminance), the luminance is displayed low so that the current consumption can be reduced while maintaining proper visibility of the user.

6 is a block diagram schematically illustrating a digital image processing apparatus according to another embodiment of the present invention. The digital image processing apparatus according to the present embodiment differs from the digital image processing apparatus according to the image described above with reference to FIG. 1 in that the display unit 90 is a liquid crystal display device and the backlight brightness adjusting unit 92 is not a gamma curve correcting unit. It is provided with. In the digital image processing apparatus according to the present exemplary embodiment, the backlight brightness adjusting unit 92 adjusts the backlight brightness of the display unit 90 according to the display brightness determined by the display brightness determining unit 64. That is, when the display brightness determined by the display brightness determiner 64 is high, the backlight brightness adjuster 92 brightens the backlight brightness of the display 90, and when the display brightness determined by the display brightness determiner 64 is low, the backlight brightness is low. The adjuster 92 dims the backlight brightness of the display 90. Through this, in the case of an image that needs to display a large brightness, the brightness is displayed high, it is possible to increase the user's image visibility in a bright environment. On the contrary, in the case of an image that needs to be displayed with low brightness, the brightness is displayed low, thereby reducing current consumption while maintaining proper visibility of the user. The backlight brightness adjusting unit 92 may be variously modified, such as being integrally formed with the display control unit 94.

Of course, the backlight brightness adjusting unit and the gamma curve correction unit are both provided, and the gamma curve correction and the backlight brightness are simultaneously adjusted according to the surrounding brightness, thereby further improving the user's image visibility and lowering power consumption.

7 is a block diagram schematically illustrating a digital image processing apparatus according to another embodiment of the present invention. The difference between the digital image processing apparatus according to the present embodiment and the digital image processing apparatus according to the embodiment described above with reference to FIG. 6 is that the digital image processing apparatus further includes a luminance data extracting unit 62. The luminance data extractor 62 extracts luminance data from the data of the image to be displayed, and the display luminance determiner 64 determines the display luminance of the image to be displayed from the luminance data extracted by the luminance data extractor 62.

8 is a flowchart schematically illustrating a display method of a digital image processing apparatus according to another embodiment of the present invention.

Referring to FIG. 8, the display brightness of the image to be displayed is determined from the data of the image to be displayed (S100), and the gamma curve is corrected according to the determined display brightness (S200). The image is displayed according to the modified gamma curve (S400). Here, the method of determining the display brightness is as described above with reference to FIGS. 3 and 4, and the correction of the gamma curve is as described above with reference to FIG. 5.

9 is a flowchart schematically illustrating a display method of a digital image processing apparatus according to another embodiment of the present invention.

Referring to FIG. 9, the display brightness of the image to be displayed is determined from the data of the image to be displayed (S100), and the backlight brightness of the display unit is adjusted according to the determined display brightness (S300). The image is displayed on the display unit (S400). Of course, the steps denoted by S400 and the steps denoted by S300 may be variously modified, such that the order may be changed or may be simultaneously performed. Here, the method of determining the display brightness is as described above with reference to FIGS. 3 and 4, and the correction of the gamma curve is as described above with reference to FIG. 5.

A program for executing this display method described with reference to FIGS. 8 and 9 may be stored in a recording medium. The recording medium may be, for example, a storage medium or a memory. The storage medium may be a storage medium such as a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.) and an optical reading medium (e.g., CD-ROM, DVD (Digital Versatile Disc) . Of course, for example, it may be, or part of, a central processing unit (CPU) of the digital image processing apparatus.

The digital image processing apparatuses according to the above-described embodiments may be image processing apparatuses having display units such as PDAs, PMPs, and the like. Of course, the digital image processing apparatuses according to the above embodiments are described as having only a display unit, but the present invention is not limited thereto. That is, it can be applied to the case of a digital photographing apparatus or the like further including an imaging unit.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1 is a block diagram schematically illustrating a digital image processing apparatus according to an embodiment of the present invention.

2 is a block diagram schematically showing a digital image processing apparatus according to another embodiment of the present invention.

3 is a graph for explaining determining display brightness of an image to be displayed according to an embodiment of the present invention.

4 is a graph for explaining determining display luminance of an image to be displayed according to an embodiment of the present invention.

5 is a graph schematically showing an example of a gamma curve correction according to an embodiment of the present invention.

6 is a block diagram schematically illustrating a digital image processing apparatus according to another embodiment of the present invention.

7 is a block diagram schematically illustrating a digital image processing apparatus according to another embodiment of the present invention.

8 is a flowchart schematically illustrating a display method of a digital image processing apparatus according to another embodiment of the present invention.

9 is a flowchart schematically illustrating a display method of a digital image processing apparatus according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

62: luminance data extraction unit 64: display luminance determination unit

66: gamma curve correction unit 70: memory

82: storage / reading control unit 80: storage medium

92: backlight brightness controller 94: display controller

90: display unit 100: CPU

Claims (17)

A display luminance determiner for determining a display luminance of the image to be displayed, from data of the image to be displayed; A gamma curve corrector for correcting a gamma curve according to the display brightness determined by the display brightness determiner; And And a display unit for displaying an image according to the gamma curve corrected by the gamma curve corrector. The display brightness determiner, Determine whether the image to be displayed is a still image or a video image; If the image to be displayed is a still image, the display brightness is respectively determined for each still image to be displayed, And when the image to be displayed is a moving image, determining the display luminance of the moving image to be displayed from data of the first frame of the moving image to be displayed. A display luminance determiner for determining a display luminance of the image to be displayed, from data of the image to be displayed; A display unit which is a liquid crystal display device for displaying an image; And And a backlight brightness controller configured to adjust backlight brightness of the display unit according to the display brightness determined by the display brightness determiner. The display brightness determiner, Determine whether the image to be displayed is a still image or a video image; If the image to be displayed is a still image, the display brightness is respectively determined for each still image to be displayed, And when the image to be displayed is a moving image, determining the display luminance of the moving image to be displayed from data of the first frame of the moving image to be displayed. The method according to claim 1 or 2, And a luminance data extraction unit for extracting luminance data from data of the image to be displayed, And the display luminance determiner determines a display luminance of an image to be displayed from the luminance data extracted by the luminance data extractor. The method of claim 3, The luminance data extractor extracts Y data from data of an image to be displayed, The display luminance determiner determines a display luminance of an image to be displayed according to a difference between the number of pixels or subpixels having an upper Y value of 10% and the number of pixels or subpixels having a lower Y value of 10%. Digital image processing apparatus, characterized in that. 5. The method of claim 4, The display luminance determiner determines that the display luminance of the image to be displayed is higher as the number of pixels or subpixels having a Y value of the upper 10% is greater than the number of pixels or subpixels having a Y value of the lower 10%. Digital image processing apparatus, characterized in that. The method of claim 3, The luminance data extractor extracts Y data from data of an image to be displayed, And the display luminance determiner determines a display luminance of an image to be displayed according to the magnitude of an average Y value. The method according to claim 6, And the display luminance determiner determines that the display luminance of the image to be displayed is higher as the Y value of the average increases. The method of claim 3, The luminance data extractor extracts Y data from data of an image to be displayed, The display luminance determiner generates number data of pixels or subpixels having respective Y values for each Y value, and determines display luminance of an image to be displayed according to the Y value of the largest number of pixels or subpixels. Digital image processing apparatus, characterized in that. 9. The method of claim 8, And the display luminance determiner determines that the display luminance of the image to be displayed is higher as the Y value of the largest pixels or subpixels is increased. The method of claim 1, And the higher the display luminance determined by the display luminance determiner, the gamma curve corrector modifies the gamma curve so that an image displayed on the display is displayed brighter. The method of claim 1, And as the display luminance determined by the display luminance determiner is higher, the gamma curve correction unit modifies the gamma curve so that the gamma value is smaller. 3. The method of claim 2, And as the display brightness determined by the display brightness determining unit is higher, the backlight brightness adjusting unit adjusts the backlight brightness of the display unit so that an image displayed on the display unit is displayed brightly. delete Determining, from data of the image to be displayed, display brightness of the image to be displayed; Modifying a gamma curve according to the determined display brightness; And Displaying the image according to the modified gamma curve; The display brightness determination step, It is determined whether the image to be displayed is a still image or a moving image, and when the image to be displayed is a still image, the display luminance is determined for each still image to be displayed, and when the image to be displayed is a moving image, And determining the display luminance of the moving image image to be displayed from the data of the first frame of the moving image image to be displayed. Determining, from data of the image to be displayed, display brightness of the image to be displayed; Adjusting backlight brightness of the display unit according to the determined display brightness; And Displaying an image on a display unit; The brightness determination step, It is determined whether the image to be displayed is a still image or a moving image, and when the image to be displayed is a still image, the display luminance is determined for each still image to be displayed, and when the image to be displayed is a moving image, And determining the display luminance of the moving image image to be displayed from the data of the first frame of the moving image image to be displayed. The method according to claim 14 or 15, And extracting luminance data from the data of the image to be displayed, wherein determining the display luminance comprises determining display luminance of the image to be displayed from the extracted luminance data. Display method. A recording medium storing a program for executing the method of claim 14 or 15.

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