JPH07225575A - Multi-window device - Google Patents

Abstract

PURPOSE:To provide a multi-window device beforehand converting the luminance of the image data and outputting a synthesis image with brightness in which respective images are extremely easy to see for the eyes of a human to a picture. CONSTITUTION:The image data are stored in a video memory 14, and image attributes showing whether or not respective image data are required for enlarging a luminance range are stored in an attribute storage means 15. An image data digital signal 1a outputted from the video memory 14 and an image attribute signal 1b outputted from the attribute storage means 15 are inputted to an image data conversion means 16. The image data conversion means 16 makes larger a luminance value of an outputting display data analog signal 1c when the image attribute signal 1b instructs the enlargement of the luminance range compared with the time when it instructs no enlargement of the luminance range to output to a display device 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-window device for displaying video moving images, photographs and character images on the same screen, and more particularly to a window for displaying video moving images and photographs. The present invention relates to a multi-window device that realizes an image with a high sense of reality by expanding the display brightness range and displays an image that is easy to see in a window that displays a character image or the like.

[0002]

2. Description of the Related Art A multi-window device is a device for displaying a plurality of images on one screen. A specific example of the configuration is shown in FIG. Reference numeral 201 is a central processing unit, 202 is a main memory, 203 is a graphics control unit, 204 is a video memory, 205 is an image data conversion unit, and 206 is a display device.

The central processing unit 201 has a main memory 20.
By reading out the program from 2 and executing the program, an instruction of image data input / output to the graphics control means 203, control of the image data conversion means 205, and other system control are performed.

The main memory 202 is the central processing unit 20.
The program and the image data processed in 1 are stored. The video memory 204 stores a plurality of image data, and this image data is stored in the image data digital signal 20.
Output as a.

The graphics control means 203 receives an input / output command of image data from the central processing unit 201 and controls the video memory 204.

The image data converting means 205 is an image data digital signal 20 output from the video memory 204.
For a, color conversion or conversion into a data format suitable for the display device 206 is performed. Further, the conversion contents are instructed from the central processing unit 201.

FIG. 22 shows the image data conversion means 205.
Shows the configuration of. The image data conversion unit 205 is composed of a color conversion unit 211 and a D / A conversion unit 212. The color conversion unit 211 inputs the image data digital signal 20a, converts the color, outputs the color-converted image data digital signal 21a, and outputs the D / A conversion unit 212.
Outputs the display data analog signal 20b after inputting the color-converted image data digital signal 21a and performing D / A conversion.

Here, the image data digital signal 20a to be input to the image data conversion means 205 is red (hereinafter referred to as "R"), green (hereinafter referred to as "G"), and blue (hereinafter referred to as "B"). ), Each of the three primary colors is represented by 8 bits, for a total of 24 bits.

The color conversion means 211 has a color correspondence table showing the correspondence of color conversion for each color (R, G, B). Each color correspondence table has 256 (= 2 ⁸ ) entries, and color data after color conversion is set in each entry. Input image data digital signal 2
In accordance with the data for each color of 0a, the color data after color conversion is read from the entry of each color correspondence table, and is output as the color conversion image data digital signal 21a.
The contents of the color correspondence table are set by the table update signal 20c from the central processing unit 201.

There is also a multi-window device in which the color conversion means is provided with a plurality of color correspondence tables for each color to display different color tones for each window (Japanese Patent Laid-Open Nos. 60-209786 and 60-209786). Sho 62-13
6695).

The D / A converting means 212 D / A converts the color-converted image data digital signal 21a and outputs the conversion result as a display data analog signal 20b.

The image display is performed as follows. The image data is input to the video memory 204 by the graphics control unit 203 according to the instruction of the central processing unit 201. The image data stored in the video memory 204 is read out as an image data digital signal 20a under the control of the graphics control means 203 and input to the image data conversion means 205. Image data conversion means 2
After the data conversion in 05, the display data analog signal 20b is output to the display device 206 to display an image.

[0013]

However, the conventional multi-window device has the following problems.

Since the image data digital signal is represented by R, G, and B 8-bit data, its luminance is represented by values of 0 to 255 (= 2 ⁸ -1) for each of R, G, and B colors. . 0 represents the lowest brightness and 255 represents the highest brightness.

FIG. 23 shows the distribution of the number of pixels with respect to the luminance in each image data. The solid line is the distribution of the number of pixels in the image taken by the camera (hereinafter referred to as the camera image), and the broken line is the image created by the computer (hereinafter CG
It is the distribution of the number of pixels in an image. Camera images include pictures of landscapes and people, video images, etc.
The G image includes a character image and an image drawn by so-called computer graphics.

For example, in the case of a character image, a display in which the contrast between the character and the background is emphasized, such as writing a black character on a white background for easy viewing, is often performed. As shown by the broken line, the distribution is concentrated around the maximum luminance value (255) and around the minimum luminance value (0). On the other hand, in the camera image, since the objects of various brightness are used as image data as they are, the distribution is such that many pixels are gathered in the intermediate luminance as shown by the solid line in FIG.

When such a camera image and a CG image are displayed on the same screen, if the screen is displayed with a brightness that makes it easy to see the CG image, the camera image becomes relatively dark. On the other hand, if the brightness of the entire monitor screen is increased so that the camera image is easy to see, the contrast of the CG image becomes too strong, and it becomes rather difficult to see due to the glare. This is because the CG image and the camera image have different screen brightness that is clearly visible to human eyes.
In the camera image, the brightness at which the pixels of intermediate brightness are clearly visible is optimal, whereas in the CG image, the maximum brightness value (2
55) Brightness that can be clearly seen in the range where the pixels in the vicinity are not dazzling is just right for human eyes.

As described above, in the conventional multi-window device, when the camera image and the CG image are displayed on the same screen, the brightness of both the camera image and the CG image cannot be easily seen. Most users
Since the brightness of the monitor is adjusted according to the brightness of the characters, the camera image is dark and difficult to see.

The present invention is to solve the above-mentioned problems of the prior art, and an image data conversion device for converting each image data in advance to a brightness that is easy to see and outputting it to a monitor screen, and a multi-window device using the same. The purpose is to provide.

[0020]

In order to achieve the above-mentioned object, a solution means provided by the invention of claim 1 is to combine an image combining means for combining a plurality of images and an image combined by the image combining means. A multi-window device including a display device for displaying on a screen is targeted, and the image synthesizing unit includes a first image that needs to have a widened brightness range and a second image that does not need to have a widened brightness range. In this configuration, only the brightness range of the first image is distinguished and enlarged and combined.

According to a second aspect of the present invention, in the configuration of the first aspect, the first image is a video image captured by a camera, and the second image is an image created by a computer. Is added.

According to a third aspect of the present invention, in the structure of the first aspect, the image synthesizing means has a plurality of storage areas for respectively storing a plurality of image data, and the images stored in the respective storage areas. A video memory for outputting data as an image data digital signal and information as to whether or not it is necessary to expand the brightness range are stored as image attributes for each of the storage areas, and the image attribute needs to expand the brightness range. Attribute storage means that outputs an image attribute signal that indicates the expansion of the luminance range and that the image attribute does not indicate that it is necessary to expand the luminance range. And an image data digital signal output from the video memory and an image attribute signal output from the attribute storage means are input, and an image is displayed on the display device. Image data conversion means for creating a display data analog signal for outputting to the display device, wherein the brightness value of the display data analog signal is set only when the image attribute signal indicates expansion of the brightness range. A configuration including an image data conversion unit for enlarging is added.

According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the image data conversion means performs conversion for expanding the brightness range of the input image data digital signal, and outputs the conversion result to the brightness. A brightness conversion unit for outputting as a converted image data digital signal, the image data digital signal, the brightness converted image data digital signal, and the image attribute signal are input, and the image attribute signal instructs to expand the brightness range. When the image data digital signal after the luminance conversion is selected when the image attribute signal does not indicate the expansion of the luminance range, the data selection means that selects and outputs the image data digital signal.
D / A conversion means for performing D / A conversion on the image data digital signal output from the data selection means or the image data digital signal after luminance conversion and outputting the conversion result as the display data analog signal. The configuration is added.

According to a fifth aspect of the invention, in the configuration of the third aspect of the invention, the image data conversion means performs color conversion on the input image data digital signal, and the conversion result is a first color conversion. First color conversion means for outputting as a post-image data digital signal, and color conversion for the input image data digital signal and conversion for expanding the luminance range, and the conversion result is the second color conversion. Second color conversion means for outputting as a post-image data digital signal, the first color-converted image data digital signal, the second color-converted image data digital signal and the image attribute signal are input, and When the image attribute signal indicates expansion of the luminance range, the second color-converted image data digital signal is selected, while the image attribute signal indicates expansion of the luminance range. If not, the data selecting means for selecting and outputting the first color-converted image data digital signal, and the first color-converted image data digital signal or the second color-converted image data output from the data selecting means. D / A conversion is performed on the image data digital signal,
A configuration including a D / A conversion means for outputting the conversion result as the display data analog signal is added.

According to a sixth aspect of the invention, in the configuration of the third aspect of the invention, the image data conversion means performs D / A conversion on the input image data digital signal, and the conversion result is the first result. First output as image data analog signal
D / A conversion means and the input image data digital signal are subjected to D / A conversion having a maximum output signal level higher than that of the first D / A conversion means, and the conversion result is converted into the second conversion result. Second D output as image data analog signal
A / A conversion means, the first image data analog signal, the second image data analog signal, and the image attribute signal are input, and when the image attribute signal indicates expansion of the luminance range, While the second image data analog signal is selected, the first image data analog signal is selected when the image attribute signal does not instruct the expansion of the brightness range, and the selected signal is used as the display data analog signal. A configuration including a data selecting means for outputting is added.

According to a seventh aspect of the present invention, in the configuration of the third aspect of the invention, the image data conversion means performs D / A conversion on the input image data digital signal, and the conversion result is an image data analog signal. When the D / A conversion means for outputting as a signal, the image data analog signal and the image attribute signal are input, and the input image data analog signal indicates the expansion of the luminance range, While amplifying with a relatively high amplification factor, when the image attribute signal does not instruct the expansion of the brightness range, it is amplified with a relatively low amplification factor and outputs the amplification result as the display data analog signal. Is added.

According to an eighth aspect of the present invention, in addition to the information as to whether or not it is necessary to expand the brightness range, the attribute storage means also stores the expansion ratio of the brightness range. Each region is stored as an image attribute, and when the image attribute indicates that the brightness range needs to be expanded, the brightness range expansion is instructed and the brightness range expansion rate is also instructed. When it is indicated that it is not necessary to expand the brightness range, an image attribute signal that does not instruct expansion of the brightness range is output, and the image data conversion means expands the brightness range with respect to the input image data digital signal. A plurality of brightness conversion means for respectively performing conversion and outputting the conversion result as a brightness-converted image data digital signal; An image data digital signal and the image attribute signal are input, and data selecting means for selecting one digital signal from the image data digital signal and the plurality of luminance-converted image data digital signals according to an instruction of the image attribute signal. And D / A for the digital signal selected by the data selecting means.
A configuration including D / A conversion means for performing conversion and outputting the conversion result as the display data analog signal is added.

According to a ninth aspect of the present invention, in addition to the information on whether or not the brightness range needs to be expanded, the attribute storage means also stores the expansion ratio of the brightness range in the structure of the third aspect. Each region is stored as an image attribute, and when the image attribute indicates that the brightness range needs to be expanded, the brightness range expansion is instructed and the brightness range expansion rate is also instructed. When it is indicated that it is not necessary to expand the brightness range, an image attribute signal that does not instruct expansion of the brightness range is output, and the image data conversion means outputs the maximum output signal for each of the input image data digital signals. A plurality of D / A conversion means for performing D / A conversions having different levels and outputting the conversion results as image data analog signals, a plurality of the image data analog signals, and An image attribute signal is input, one analog signal is selected from a plurality of the image data analog signals according to an instruction of the image attribute signal, and the selected analog signal is output as the display data analog signal. Is added.

According to a tenth aspect of the present invention, in the structure of the first aspect, the image synthesizing means has a plurality of storage areas for respectively storing a plurality of image data, and the images stored in the respective storage areas. A main memory that outputs data as a digital signal before brightness adjustment and information as to whether or not it is necessary to expand the brightness range are stored as image attributes for each of the storage areas. An image attribute signal is output to indicate that the luminance range needs to be enlarged, and an image attribute signal that does not indicate to extend the luminance range is output when the image attribute indicates that the luminance range does not need to be enlarged. The attribute storage means, the pre-brightness-adjustment image data digital signal output from the main memory, and the image attribute signal output from the attribute storage means are input to First image data conversion means for outputting the adjusted image data digital signal to a video memory, and increasing the luminance value of the image data digital signal only when the image attribute signal indicates expansion of the luminance range. The first image data conversion unit and the brightness-adjusted image data digital signal output from the first image data conversion unit are temporarily stored as image data, and the stored image data is output as an image data digital signal. A configuration including a video memory and a second image data converting means for inputting the image data digital signal output from the video memory and creating and outputting a display data analog signal is added.

According to an eleventh aspect of the present invention, in the configuration of the tenth aspect of the invention, the first image data conversion means performs conversion for expanding a luminance range with respect to the input image data digital signal before luminance adjustment. And a brightness conversion unit that outputs the conversion result as a brightness-converted image data digital signal,
The image data digital signal before the brightness adjustment, the image data digital signal after the brightness conversion, and the image attribute signal are input, and the image data digital signal after the brightness conversion when the image attribute signal indicates the expansion of the brightness range. On the other hand, when the image attribute signal does not indicate the expansion of the brightness range, the pre-brightness adjustment image data digital signal is selected, and the selected signal is output as the post-brightness adjustment image data digital signal. A configuration including selection means is added.

According to a twelfth aspect of the present invention, in the configuration of the tenth aspect of the invention, the first image data conversion means performs color conversion on the input image data digital signal before luminance adjustment, and a conversion result. A first color conversion means for outputting as a first color-converted image data digital signal;
Performs color conversion and conversion to expand the brightness range,
Second color conversion means for outputting the conversion result as a second color-converted image data digital signal, the first color-converted image data digital signal, the second color-converted image data digital signal, and the image Attribute signal and is input,
The second color-converted image data digital signal is selected when the image attribute signal indicates the expansion of the luminance range, and the first when the image attribute signal does not indicate the expansion of the luminance range. A configuration is further provided, which comprises a data selecting means for selecting a color-converted image data digital signal and outputting the selected signal as the brightness-adjusted image data digital signal.

According to a thirteenth aspect of the present invention, in addition to the configuration of the tenth aspect of the invention, the attribute storage means stores the expansion ratio of the brightness range in addition to the information as to whether or not the brightness range needs to be expanded. Each region is stored as an image attribute, and when the image attribute indicates that the brightness range needs to be expanded, the brightness range expansion is instructed and the brightness range expansion rate is also instructed. When it is indicated that it is not necessary to expand the brightness range, an image attribute signal that does not instruct the expansion of the brightness range is output, and the first image data conversion means outputs the pre-adjustment image data digital signal. A plurality of brightness conversion means for respectively performing conversion for expanding the brightness range and outputting the conversion result as a brightness-converted image data digital signal; Signal, a plurality of the image data digital signals after the luminance conversion and the image attribute signal are input, and among the image data digital signal before the luminance adjustment and a plurality of the image data digital signals after the luminance conversion according to an instruction of the image attribute signal. And a data selecting means for selecting one digital signal from the above and outputting the selected digital signal as the brightness-adjusted image data digital signal.

Further, the means for solving the problems according to the fourteenth aspect of the present invention is to expand the luminance range and the image data digital signal output from the video memory storing a plurality of image data in each of a plurality of storage areas. Information about whether or not it is necessary is output from an attribute storage unit that stores image information for each storage area. When the image attribute indicates that the brightness range needs to be expanded, While instructing enlargement, when the image attribute indicates that it is not necessary to enlarge the luminance range, an image attribute signal not instructing enlargement of the luminance range is input, and display data for displaying an image on the display device. Targeting an image data conversion device that creates an analog signal and outputs it to the display device, and only when the input image attribute signal indicates expansion of the luminance range. It is an arrangement that increases the luminance value of the display data analog signals.

According to a fifteenth aspect of the present invention, in addition to the structure of the fourteenth aspect, the input image data digital signal is converted so as to expand the luminance range, and the conversion result is converted into a luminance-converted image data digital signal. The brightness conversion means for outputting, the image data digital signal, the brightness-converted image data digital signal, and the image attribute signal are input, and when the image attribute signal indicates expansion of the brightness range, the brightness conversion is performed. While selecting the image data digital signal, when the image attribute signal does not instruct the expansion of the luminance range, the data selecting means for selecting and outputting the image data digital signal, and the image data output from the data selecting means D / A conversion is performed on the digital signal or the image data digital signal after luminance conversion,
A configuration including a D / A conversion means for outputting the conversion result as the display data analog signal is added.

According to a sixteenth aspect of the present invention, in the structure of the fourteenth aspect, color conversion is performed on the input image data digital signal, and the conversion result is output as a first color-converted image data digital signal. First color conversion means for
Second color conversion means for performing color conversion on the input image data digital signal, conversion for expanding the luminance range, and outputting the conversion result as a second color-converted image data digital signal; The first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input, and when the image attribute signal indicates expansion of the luminance range, the first And a data selecting means for selecting and outputting the first color-converted image data digital signal when the image attribute signal does not instruct to expand the luminance range. , A D / A conversion with respect to the first color-converted image data digital signal or the second color-converted image data digital signal output from the data selecting means. It was carried out, but to add a structure and a D / A converting means for outputting a conversion result as the display data analog signals.

According to a seventeenth aspect of the present invention, in addition to the configuration of the fourteenth aspect, the input image data digital signal is subjected to D / A conversion, and the conversion result is output as a first image data analog signal. The first D / A conversion means and the input image data digital signal are subjected to D / A conversion having a maximum output signal level higher than that of the first D / A conversion means, and the conversion result is Second D / A conversion means for outputting as the second image data analog signal, the first image data analog signal, the second image data analog signal, and the image attribute signal are input, and the image attribute signal Is instructed to expand the brightness range, the second
Of the image data analog signal is selected, and when the image attribute signal does not instruct to expand the brightness range, the first
The image data analog signal is selected, and the selected signal is output as the display data analog signal.

According to an eighteenth aspect of the present invention, in the configuration of the fourteenth aspect of the invention, the D / A conversion is performed on the input image data digital signal, and the conversion result is output as an image data analog signal. The converting means, the image data analog signal and the image attribute signal are input, and the input image data analog signal is input with a relatively high amplification factor when the image attribute signal indicates expansion of the luminance range. On the other hand, when the image attribute signal does not instruct the expansion of the luminance range, the amplification is performed at a relatively low amplification factor, and the amplification result is output as the display data analog signal. To do.

[0038] Further, in the solution means provided by the nineteenth aspect of the invention, the image data digital signal output from the video memory storing the plurality of image data in each of the plurality of storage areas and the luminance range are expanded. In addition to the information as to whether or not it is necessary, the expansion ratio of the brightness range is also output from the attribute storage unit that stores the image attribute for each storage area,
When the image attribute indicates that the brightness range needs to be expanded, the brightness range expansion is instructed and the brightness range expansion rate is also instructed, while the image attribute does not need to be expanded. When the image attribute signal that does not instruct the expansion of the brightness range when input is input, the display data analog signal for displaying an image on the display device is created and the image data conversion device for outputting to the display device is targeted, Only when the input image attribute signal indicates the expansion of the luminance range, the luminance value of the display data analog signal is increased in accordance with the instruction of the image attribute signal.

According to a twentieth aspect of the present invention, in addition to the configuration of the nineteenth aspect of the invention, conversion for expanding the luminance range is performed on the input image data digital signal, and the conversion result is used as the luminance-converted image data digital signal. A plurality of brightness converting means for outputting, the image data digital signal, the plurality of brightness-converted image data digital signals and the image attribute signal are input, and the image data digital signal and the plurality of image data digital signals are input in accordance with an instruction of the image attribute signal. Data selecting means for selecting one digital signal from the image data digital signals after the luminance conversion, and D / A conversion for the digital signal selected by the data selecting means, and the conversion result is the display data analog. A configuration including a D / A conversion means for outputting as a signal is added.

According to a twenty-first aspect of the present invention, in addition to the configuration of the nineteenth aspect of the invention, D / A conversion with different maximum output signal levels is performed on the input image data digital signal, and the conversion result is the image data analog signal. A plurality of D / A conversion means for outputting the respective image data, the plurality of image data analog signals and the image attribute signal are input, and one analog signal is selected from the plurality of image data analog signals according to the instruction of the image attribute signal. And a data selecting means for selecting a signal and outputting the selected analog signal as the display data analog signal.

Further, the means for solving the problems according to the twenty-second aspect of the present invention is to provide a pre-brightness adjustment image data digital signal output from a main memory storing a plurality of image data in each of a plurality of storage areas, and a brightness range. Is output from an attribute storage unit that stores information as to whether or not it is necessary to enlarge each storage area as an image attribute, and when the image attribute indicates that the luminance range needs to be enlarged. While instructing expansion of the brightness range, when the image attribute indicates that it is not necessary to expand the brightness range, an image attribute signal not instructing expansion of the brightness range is input,
Targeting an image data conversion device that creates a digital signal after brightness adjustment and outputs it to a video memory, only when the input image attribute signal indicates expansion of the brightness range, the digital signal after the brightness adjustment The configuration is such that the brightness value is increased.

According to a twenty-third aspect of the present invention, in addition to the configuration of the twenty-second aspect, a conversion for expanding the luminance range is performed on the input image data signal before luminance adjustment, and the conversion result is image data digital after luminance conversion. When the brightness conversion means for outputting as a signal, the image data digital signal before the brightness adjustment, the image data digital signal after the brightness conversion and the image attribute signal are input, and the image attribute signal indicates the expansion of the brightness range. Selects the image data digital signal after the brightness conversion, while selects the image data digital signal before brightness adjustment when the image attribute signal does not instruct the expansion of the brightness range, and selects the selected signal as the brightness adjustment. A configuration including a data selecting means for outputting as a post image data digital signal is added.

According to a twenty-fourth aspect of the present invention, in the configuration of the twenty-second aspect, color conversion is performed on the input image data digital signal before luminance adjustment, and the conversion result is the first image data digital image after color conversion. The first color conversion means for outputting as a signal, and the input pre-adjustment image data digital signal for performing the color conversion and the conversion for expanding the brightness range, and the conversion result after the second color conversion. Second color conversion means for outputting as image data digital signal;
The first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input, and when the image attribute signal indicates expansion of the luminance range, the first While the second color-converted image data digital signal is selected, when the image attribute signal does not instruct the expansion of the luminance range, the first color-converted image data digital signal is selected and the selected signal is selected. A configuration including a data selecting means for outputting the image data digital signal after the brightness adjustment is added.

The means for solving the problems of the twenty-fifth aspect of the present invention is to provide a pre-brightness adjustment image data digital signal output from a main memory which stores a plurality of image data in a plurality of storage areas, respectively, and a brightness range. In addition to the information on whether or not it is necessary to expand the brightness range, the expansion ratio of the brightness range is also output from the attribute storage unit that stores the image attribute for each storage area. The image attribute needs to expand the brightness range. If the image attribute indicates that there is no need to expand the luminance range, the luminance range expansion ratio is also instructed, while if the image attribute indicates that the luminance range does not need to be expanded. The image data conversion device that receives the image attribute signal and creates the digital image data signal after adjusting the brightness and outputs it to the video memory. Only when the attribute signal indicates the expansion brightness range, it is an arrangement that increases the luminance value of the luminance adjusted image data digital signals in accordance with an instruction of the image attribute signal.

According to a twenty-sixth aspect of the present invention, in addition to the configuration of the twenty-fifth aspect, a conversion for expanding the luminance range is performed on the inputted image data digital signal before luminance adjustment, and the conversion result is the image data digital image after luminance conversion. A plurality of brightness conversion means each outputting as a signal, the pre-brightness adjustment image data digital signal, a plurality of the brightness conversion after-image data digital signal and the image attribute signal are input, and the brightness according to the instruction of the image attribute signal. Selecting one digital signal from the pre-adjustment image data digital signal and the plurality of luminance-converted image data digital signals;
A configuration including a data selection means for outputting the selected digital signal as the brightness-adjusted image data digital signal is added.

[0046]

According to the structure of claim 1, when a plurality of images input to the multi-window device are combined by the image combining means, it is not necessary to expand the brightness range and the image for which the brightness range needs to be expanded. The brightness range is expanded only for the image that needs to be expanded and is distinguished from the image. Therefore, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye.

According to the configuration of claim 2, when the plurality of images input to the multi-window device are combined by the image combining means, the images taken by the camera and the images created by the computer are distinguished from each other, and the images are separated by the camera. The brightness range is expanded only for the captured image. Therefore, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye.

According to the third aspect, the plurality of image data input to the image synthesizing means are stored in the video memory having a plurality of storage areas. At the same time, information on whether or not it is necessary to expand the brightness range is stored in the attribute storage means as an image attribute for each storage area. Image data digital signals are output from the video memory. From the attribute storage means, when the image attribute indicates that the luminance range needs to be expanded, the luminance range is instructed to be expanded, while when the image attribute indicates that the luminance range does not need to be expanded, the luminance An image attribute signal that does not instruct to expand the range is output. The image data digital signal and the image attribute signal are input to the image data conversion means, and the image data conversion means creates a display data analog signal for displaying an image based on these two signals and outputs it to the display device. At this time, the image data conversion means increases the brightness value of the display data analog signal only when the image attribute signal indicates the expansion of the brightness range. Therefore, the display data analog signal corresponding to the image data for which the expansion of the brightness range is instructed has a relatively large brightness value compared to the display data analog signal corresponding to the image data for which the expansion of the brightness range is not instructed. As a result, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye.

According to the structure of claim 4, the image data digital signal input to the image data conversion means is first converted by the brightness conversion means to expand the brightness range,
The converted image data is output as a digital signal. The image data digital signal, the luminance-converted image data digital signal, and the image attribute signal are input to the data selecting means. When the image attribute signal indicates expansion of the luminance range in the data selecting means, the luminance-converted image data digital signal. On the other hand, when the image attribute signal does not instruct the expansion of the brightness range, the image data digital signal is selected and output. The output image data digital signal or the luminance-converted image data digital signal is
D / A conversion is performed in the D / A conversion means and output as a display data analog signal. Therefore, in the image data conversion means, the brightness value of the display data analog signal can be increased only when the image attribute signal instructs the expansion of the brightness range.

According to the structure of claim 5, the image data digital signal input to the image data converting means is first subjected to color conversion in the first color converting means, and is converted into a first color-converted image data digital signal. Is output. Also,
The second color conversion means performs color conversion and conversion for expanding the luminance range, and outputs the second color-converted image data digital signal. The first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input to the data selection means, and the image attribute signal instructs the luminance selection to be expanded in the data selection means. The second color-converted image data digital signal is selected in this case, while the first color-converted image data digital signal is selected and output when the image attribute signal does not instruct to expand the luminance range. The outputted first color-converted image data digital signal or the second color-converted image data digital signal is D / A converted by the D / A conversion means and output as a display data analog signal. Therefore, in the image data conversion means, the brightness value of the display data analog signal can be increased only when the image attribute signal instructs the expansion of the brightness range.

According to the structure of claim 6, the image data digital signal input to the image data conversion means is first D / A converted in the first D / A conversion means, and
Image data is output as an analog signal. Further, the second D / A conversion means performs D / A conversion having a maximum output signal level higher than that of the first D / A conversion means.
Image data is output as an analog signal. The first image data analog signal, the second image data analog signal, and the image attribute signal are input to the data selection means, and when the image attribute signal indicates the expansion of the luminance range, the second image is input to the data selection means. While the data analog signal is selected, when the image attribute signal does not instruct to expand the brightness range, the first image data analog signal is selected, and the selected image data analog signal is used as the display data analog signal. Is output. Therefore, in the image data conversion means, the brightness value of the display data analog signal can be increased only when the image attribute signal instructs the expansion of the brightness range.

According to the structure of claim 7, the image data digital signal input to the image data conversion means is D / A converted in the D / A conversion means and output as an image data analog signal. The image data analog signal and the image attribute signal are input to the amplifying means, and the image data analog signal is amplified by a relatively high amplification factor when the image attribute signal indicates expansion of the luminance range, while the image attribute signal is amplified. When is not instructed to expand the brightness range, it is amplified with a relatively low amplification factor, and the amplification result is output as a display data analog signal. Therefore, in the image data conversion means, the brightness value of the display data analog signal can be increased only when the image attribute signal instructs the expansion of the brightness range.

According to the structure of claim 8, the attribute storage means is
In addition to the information on whether the brightness range needs to be expanded,
The expansion ratio of the brightness range is also stored as an image attribute for each storage area of the video memory. From the attribute storage means, when the image attribute indicates that the brightness range needs to be expanded, the brightness range is expanded and the expansion ratio of the brightness range is also specified, while the image attribute is required to be expanded. If there is not, the image attribute signal that does not instruct the expansion of the brightness range is output. The image data digital signal input to the image data conversion means is subjected to conversion for expanding the brightness range in a plurality of brightness conversion means which are given different expansion ratios of the brightness range, respectively, and the image data digital signal after the brightness conversion is carried out. Is output as. The image data digital signal and the plurality of luminance-converted image data digital signals and the image attribute signal are input to the data selection means, and the data selection means follows the instruction of the image attribute signal and the image data digital signal and the plurality of luminance-converted image data. One digital signal is selected from the digital signals. The selected digital signal is D / A converted by the D / A conversion means and output as a display data analog signal. Therefore, in the image data conversion means, the brightness value of the display data analog signal can be increased according to the given expansion ratio of the brightness range only when the image attribute signal instructs the expansion of the brightness range.

According to the structure of claim 9, the attribute storage means is
In addition to the information on whether the brightness range needs to be expanded,
The expansion ratio of the brightness range is also stored as an image attribute for each storage area of the video memory. From the attribute storage means, when the image attribute indicates that the brightness range needs to be expanded, the brightness range is expanded and the expansion ratio of the brightness range is also specified, while the image attribute is required to be expanded. If there is not, the image attribute signal that does not instruct the expansion of the brightness range is output. The image data digital signal input to the image data conversion means is a plurality of D / D signals.
D having different maximum output levels in the A conversion means
/ A conversion is performed, and each is output as an image data analog signal. The plurality of image data analog signals and the image attribute signals are input to the data selecting means, and the data selecting means selects and selects one analog signal from the plurality of image data analog signals in accordance with the instruction of the image attribute signals. The analog signal is output as a display data analog signal. Therefore, in the image data conversion means, the brightness value of the display data analog signal can be increased according to the given expansion ratio of the brightness range only when the image attribute signal instructs the expansion of the brightness range.

According to the tenth aspect, the plurality of image data input to the image synthesizing means are stored in the main memory having a plurality of storage areas. At the same time, information on whether or not it is necessary to expand the brightness range is stored in the attribute storage means as an image attribute for each storage area. An image data digital signal before brightness adjustment is output from the main memory. From the attribute storage means, when the image attribute indicates that the luminance range needs to be expanded, the luminance range is instructed to be expanded, while when the image attribute indicates that the luminance range does not need to be expanded, the luminance An image attribute signal that does not instruct to expand the range is output. The image data digital signal before brightness adjustment and the image attribute signal are input to the first image data conversion unit, and the image data digital signal after brightness adjustment is created and output by the first image data conversion unit based on these two signals. To be done. At this time, the first image data conversion means increases the brightness value of the brightness-adjusted image data digital signal only when the image attribute signal indicates expansion of the brightness range. The output brightness-adjusted image data digital signal is input to the video memory and temporarily stored as image data. The image data is again output from the video memory as an image data digital signal,
In the image data converting means, the display data is converted into an analog signal and output. Therefore, the display data analog signal corresponding to the image data for which the expansion of the brightness range is instructed has a relatively large brightness value compared to the display data analog signal corresponding to the image data for which the expansion of the brightness range is not instructed. As a result, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye.

According to the eleventh aspect of the invention, the image data digital signal before brightness adjustment input to the first image data conversion means is first subjected to conversion for expanding the brightness range in the brightness conversion means, and the image after brightness conversion is performed. It is output as a data digital signal. The image data digital signal before luminance adjustment, the image data after luminance conversion, and the image attribute digital signal are input to the data selecting means, and when the image attribute signal indicates the expansion of the luminance range, the image after luminance conversion is inputted in the data selecting means. While the data digital signal is selected, when the image attribute signal does not instruct the expansion of the brightness range, the pre-luminance conversion image data digital signal is selected and the selected digital signal is output as the brightness-adjusted image data digital signal. To be done. Therefore, in the first image data conversion means, the brightness value of the brightness-adjusted image data digital signal can be increased only when the image attribute signal indicates the expansion of the brightness range.

According to the twelfth aspect, the image data digital signal before brightness adjustment input to the first image data conversion means is first subjected to color conversion in the first color conversion means, and then the first color conversion is performed. After image data is output as a digital signal. In addition, the second color conversion unit performs color conversion and conversion for expanding the luminance range, and outputs the second color-converted image data digital signal. The first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input to the data selection means, and the image attribute signal instructs the luminance selection to be expanded in the data selection means. When the second color-converted image data digital signal is selected,
When the image attribute signal does not instruct to expand the luminance range, the first color-converted image data digital signal is selected.
The selected digital signal is output as an image data digital signal after brightness adjustment. Therefore, in the first image data conversion means, the brightness value of the brightness-adjusted image data digital signal can be increased only when the image attribute signal indicates the expansion of the brightness range.

According to the thirteenth aspect of the invention, the attribute storage means stores the enlargement ratio of the brightness range as an image attribute for each storage area of the main memory, in addition to the information as to whether or not the brightness range needs to be expanded. ing. From the attribute storage means, when the image attribute indicates that the brightness range needs to be expanded, the brightness range is expanded and the expansion ratio of the brightness range is also specified, while the image attribute is required to be expanded. If there is not, the image attribute signal that does not instruct the expansion of the brightness range is output. The pre-brightness adjustment image data digital signal input to the first image data conversion means is subjected to conversion for expanding the brightness range in a plurality of brightness conversion means which are given different expansion ratios of the brightness range, respectively. The converted image data is output as a digital signal. The image data digital signal before brightness adjustment, the plurality of image data digital signals after brightness conversion, and the image attribute signal are input to the data selecting means, and the data selecting means receives the image data digital signal before brightness adjustment and the plurality of image data digital signals according to the instruction of the image attribute signal. One digital signal is selected from the image data digital signals after the luminance conversion. The selected digital signal is output as an image data digital signal after brightness adjustment. Therefore, in the first image data conversion means, the brightness value of the brightness-adjusted image data digital signal is adjusted in accordance with the given expansion ratio of the brightness range only when the image attribute signal indicates the expansion of the brightness range. Can be large.

According to the fourteenth aspect, the image data digital signal output from the video memory storing the plurality of image data in each of the plurality of storage areas is input to the image data conversion device. Also, it is shown that the image attribute is output from the attribute storage unit that stores the information as to whether or not the brightness range needs to be expanded as the image attribute for each storage area, and that the brightness range needs to be expanded. When the image attribute indicates that the luminance range does not need to be expanded, an image attribute signal that does not instruct the expansion of the luminance range is input to the image data conversion device. In the image data conversion device, a display data analog signal for displaying an image on the display device is created and output to the display device. At this time, the brightness value of the display data analog signal is increased only when the input image attribute signal instructs expansion of the brightness range.
Therefore, the display data analog signal corresponding to the image data for which the expansion of the brightness range is instructed has a relatively large brightness value compared to the display data analog signal corresponding to the image data for which the expansion of the brightness range is not instructed. As a result, in the multi-window device using this device, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye.

According to the fifteenth aspect, the image data digital signal input to the image data conversion device is first
The brightness conversion means performs conversion for expanding the brightness range, and the converted image data is output as a digital signal after the brightness conversion. The image data digital signal, the luminance-converted image data digital signal, and the image attribute signal are input to the data selecting means. When the image attribute signal indicates expansion of the luminance range in the data selecting means, the luminance-converted image data digital signal. On the other hand, when the image attribute signal does not instruct the expansion of the brightness range, the image data digital signal is selected and output. The output image data digital signal or the luminance-converted image data digital signal is D / A converted by the D / A conversion means and output as a display data analog signal. Therefore, in the image data conversion device, it is possible to increase the brightness value of the display data analog signal only when the image attribute signal instructs the expansion of the brightness range.

According to the structure of claim 16, the image data digital signal input to the image data conversion device is
Color conversion is performed in the first color conversion means, and the first color-converted image data digital signal is output. In addition, the second color conversion unit performs color conversion and conversion for expanding the luminance range, and outputs the second color-converted image data digital signal. The first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input to the data selection means, and the image attribute signal instructs the luminance selection to be expanded in the data selection means. The second color-converted image data digital signal is selected in this case, while the first color-converted image data digital signal is selected and output when the image attribute signal does not instruct to expand the luminance range. The outputted first color-converted image data digital signal or the second color-converted image data digital signal is D / A converted by the D / A conversion means and output as a display data analog signal. Therefore, in the image data conversion device, it is possible to increase the brightness value of the display data analog signal only when the image attribute signal instructs the expansion of the brightness range.

According to the seventeenth aspect, the image data digital signal input to the image data conversion device is first
D / A conversion is performed in the first D / A conversion means, and output as a first image data analog signal. Also,
The second D / A conversion means performs D / A conversion having a maximum output signal level higher than that of the first D / A conversion means, and outputs the second image data analog signal. The first image data analog signal, the second image data analog signal, and the image attribute signal are input to the data selection means, and when the image attribute signal indicates the expansion of the luminance range, the second image is input to the data selection means. While the data analog signal is selected, when the image attribute signal does not instruct to expand the brightness range, the first image data analog signal is selected, and the selected image data analog signal is used as the display data analog signal. Is output. Therefore, in the image data conversion device, it is possible to increase the brightness value of the display data analog signal only when the image attribute signal instructs the expansion of the brightness range.

According to the eighteenth aspect, the image data digital signal input to the image data conversion device is D / A.
The conversion means performs D / A conversion and outputs the image data analog signal. The image data analog signal and the image attribute signal are input to the amplifying means, and the image data analog signal is amplified by a relatively high amplification factor when the image attribute signal indicates expansion of the luminance range, while the image attribute signal is amplified. When is not instructed to expand the brightness range, it is amplified with a relatively low amplification factor, and the amplification result is output as a display data analog signal. Therefore, in the image data conversion device, it is possible to increase the brightness value of the display data analog signal only when the image attribute signal instructs the expansion of the brightness range.

According to the nineteenth aspect of the invention, the image data digital signal output from the video memory storing the plurality of image data in each of the plurality of storage areas is input to the image data converter. Further, in addition to the information as to whether or not the brightness range needs to be expanded, the expansion ratio of the brightness range is also output from an attribute storage unit that stores the expansion ratio of the brightness range as the image attribute. If the image attribute indicates that the luminance range does not need to be expanded, the luminance range expansion rate is instructed as well as the luminance range expansion ratio is instructed. An image attribute signal that does not instruct enlargement is input to the image data conversion device. In the image data conversion device, a display data analog signal for displaying an image on the display device is created and output to the display device. At this time, the value of the display data analog signal is increased according to the enlargement ratio of the luminance range instructed by the image attribute signal, only when the input image attribute signal instructs the enlargement of the luminance range. Therefore, the display data analog signal corresponding to the image data for which the expansion of the brightness range is instructed has a relatively large brightness value compared to the display data analog signal corresponding to the image data for which the expansion of the brightness range is not instructed. As a result, in the multi-window device using this device, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye.

According to the twentieth aspect of the invention, the image data digital signal input to the image data conversion device is converted by a plurality of brightness conversion means to which expansion ratios of different brightness ranges are given. Are output as image data digital signals after luminance conversion. The image data digital signal and the plurality of luminance-converted image data digital signals and the image attribute signal are input to the data selection means, and the data selection means follows the instruction of the image attribute signal and the image data digital signal and the plurality of luminance-converted image data. One digital signal is selected from the digital signals. The selected digital signal is D / A converted by the D / A conversion means and output as a display data analog signal. Therefore, in the image data conversion device, the luminance value of the display data analog signal can be increased according to the given enlargement ratio of the luminance range only when the image attribute signal instructs the enlargement of the luminance range.

According to the twenty-first aspect, the image data digital signal input to the image data conversion device is subjected to D / A conversion with different maximum output levels in the plurality of D / A conversion means, and the image data analog signals are respectively converted. It is output as a signal. The plurality of image data analog signals and the image attribute signal are input to the data selecting means, and the data selecting means selects one analog signal from the plurality of image data analog signals according to the instruction of the image attribute signal. The selected analog signal is output as a display data analog signal. Therefore, in the image data conversion device, the luminance value of the display data analog signal can be increased according to the given enlargement ratio of the luminance range only when the image attribute signal instructs the enlargement of the luminance range.

According to the twenty-second aspect, the image data digital signal before brightness adjustment output from the main memory storing the plurality of image data in each of the plurality of storage areas is input to the image data converter. Also, it is shown that the image attribute is output from the attribute storage unit that stores the information as to whether or not the brightness range needs to be expanded as the image attribute for each storage area, and that the brightness range needs to be expanded. When the image attribute indicates that the luminance range does not need to be expanded, an image attribute signal that does not instruct the expansion of the luminance range is input to the image data conversion device. In the image data conversion device, a brightness-adjusted image data digital signal is created and output to the video memory. At this time, only when the input image attribute signal indicates expansion of the luminance range,
After the brightness adjustment, the brightness value of the image data digital signal is increased. Therefore, the brightness-adjusted image data digital signal corresponding to the image data for which the expansion of the brightness range is instructed is compared with the brightness-adjusted image data digital signal corresponding to the image data for which the expansion of the brightness range is not instructed. As a result, it has a relatively large brightness value, and as a result, in a multi-window device using this device, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye. To be done.

According to the twenty-third aspect, the image data digital signal before brightness adjustment inputted to the image data conversion device is first subjected to conversion for expanding the brightness range in the brightness conversion means, and the image data digital signal after brightness conversion. Is output as. The image data digital signal before brightness adjustment, the image data digital signal after brightness conversion, and the image attribute signal are input to the data selecting means, and in the data selecting means,
When the image attribute signal indicates expansion of the brightness range, the image data digital signal after brightness conversion is selected, while when the image attribute signal does not indicate expansion of the brightness range, image data digital signal before brightness adjustment is selected. The selected signal is output as a digital signal for image data after brightness adjustment. Therefore, in the image data conversion device, the brightness value of the brightness-adjusted image data digital signal can be increased only when the image attribute signal indicates the expansion of the brightness range.

According to the twenty-fourth aspect, the pre-luminance adjustment image data digital signal input to the image data conversion device is first subjected to color conversion in the first color conversion means,
The first color-converted image data is output as a digital signal. In addition, the second color conversion unit performs color conversion and conversion for expanding the luminance range, and outputs the second color-converted image data digital signal. The first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input to the data selection means, and the image attribute signal instructs the luminance selection to be expanded in the data selection means. When the second color-converted image data digital signal is selected, the first color-converted image data digital signal is selected and selected when the image attribute signal does not instruct to expand the luminance range. Is output as a digital signal of image data after brightness adjustment. Therefore, in the image data conversion device, the brightness value of the brightness-adjusted image data digital signal can be increased only when the image attribute signal indicates the expansion of the brightness range.

According to the twenty-fifth aspect, the image data digital signal before brightness adjustment output from the main memory storing the plurality of image data in each of the plurality of storage areas is input to the image data converter. Further, in addition to the information as to whether or not the brightness range needs to be expanded, the expansion ratio of the brightness range is also output from the attribute storage unit that stores the image range as the image attribute. When it indicates that it is necessary to enlarge, it instructs the enlargement of the brightness range and also indicates the enlargement ratio of the brightness range, while when the image attribute indicates that it is not necessary to enlarge the brightness range, it expands the brightness range. An image attribute signal that does not instruct is input to the image data conversion device. In the image data conversion device, a brightness-adjusted image data digital signal is created and output to the video memory. At this time, only when the input image attribute signal indicates expansion of the brightness range, the brightness value of the brightness-adjusted image data digital signal is increased according to the expansion ratio of the brightness range specified by the image attribute signal. Therefore, the brightness-adjusted image data digital signal corresponding to the image data for which the expansion of the brightness range is instructed is compared with the brightness-adjusted image data digital signal corresponding to the image data for which the expansion of the brightness range is not instructed. As a result, it has a relatively large brightness value, and as a result, in a multi-window device using this device, the combined image is displayed on one screen with the brightness at which each image is most visible to the human eye. To be done.

According to the twenty-sixth aspect, the pre-brightness-adjustment image data digital signal input to the image data conversion device expands the brightness range in a plurality of brightness conversion means that are given different expansion ratios of the brightness range. Conversion is performed, and the converted luminance data is output as a digital image data signal. The image data digital signal before brightness adjustment, the plurality of image data digital signals after brightness conversion, and the image attribute signal are input to the data selecting means, and the data selecting means receives the image data digital signal before brightness adjustment and the plurality of image data digital signals according to the instruction of the image attribute signal. One digital signal is selected from the image-converted image data digital signals. The selected digital signal is output as an image data digital signal after brightness adjustment. Therefore, in the image data conversion device, the brightness value of the brightness-adjusted image data digital signal can be increased according to the expansion ratio of the given brightness range only when the image attribute signal instructs the expansion of the brightness range. it can.

[0072]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the distribution of the number of pixels with respect to the luminance in each image data. The thin solid line is the distribution of the number of pixels of the image captured by the camera (camera image) before the brightness adjustment, the thick solid line is the distribution of the pixel number of the camera image after the brightness adjustment, and the broken line is the computer-generated image (CG
It is the distribution of the number of pixels in the (image).

As shown in FIG. 1, the distribution of the number of pixels in a camera image in which a large number of pixels exist in the intermediate luminance is shown by a thick solid line in which many pixels exist near the maximum luminance value (255). In order to obtain such a distribution, the point of the present invention is to perform conversion for expanding only the luminance range of the camera image before the screen display. When the camera image and the CG image are displayed on the same screen after such conversion, C
Since the brightness at which the G image is easy to see and the brightness at which the camera image is easy to see are almost the same, the CG image remains visible and the camera image is displayed brighter and clearer than before.

Of course, even if the luminance range of the CG image is reduced and then the luminance of the entire screen is increased, the same effect can be obtained and substantially the same effect can be obtained.

Specific embodiments will be described below with reference to the drawings.

(Embodiment 1) FIG. 2 shows a system configuration of a multi-window device according to this embodiment. In FIG. 2, 11 is a central processing unit, 12 is a main memory, 1
3 is a graphics control means, 14 is a video memory, 1
Reference numeral 5 is an attribute storage means, 16 is an image data conversion means, and 17 is a display device, and 11, 12, 13, 14, 15, and 16 constitute an image composition means.

The central processing unit 11 executes the program stored in the main memory 12, and the video memory 14
And the input / output of the attribute storage means 15 is instructed to the graphics control means 13, and the conversion contents of the image data conversion means 16 are set. Graphics control means 13
Receives an instruction from the central processing unit 11 and controls the video memory 14 and the attribute storage means 15 to execute input / output.

The video memory 14 stores image data to be displayed. In this embodiment, one image having a region of 1024 pixels in the horizontal direction and 800 lines in the vertical direction can be stored. Of course, the video memory 14 that can store a plurality of images can be configured, and the video memory 14 that stores different image data for each window can also be configured.

The attribute storage means 15 stores, as an image attribute, information corresponding to each area of the image data stored in the video memory 14 as to whether or not the area requires expansion of the luminance range. There is. In this embodiment, the attribute storage means 15
Is 1024 pixels x 80 corresponding to the pixels of the video memory
It is configured by a memory of 0 line × 1 bit, and each bit is set to “1” in an area requiring expansion of the luminance range and “0” in an unnecessary area.

The image data conversion means 16 inputs the image data digital signal 1a output from the video memory 14 and the image attribute signal 1b output from the attribute storage means 15, and outputs the display data analog signal 1c to the display device. To do. The display device 17 displays the image on the monitor screen by the display data analog signal 1c output from the image data conversion means 16.

Now, it is assumed that the video memory 14 stores images as shown in FIG. The three windows store character images, still images of landscapes, and moving images of rockets. This image is sequentially read in the horizontal direction from the upper left to the lower right, and is output as the image data digital signal 1a.

At this time, in the attribute storage means 15, as shown in FIG. 4, "1" is displayed in the area where the still image and the moving image are displayed.
"," And "0" are stored as image attributes in other areas. The stored image attributes are the video memory 14
The image attribute signal 1 which is sequentially read from the upper left to the lower right in the horizontal direction in synchronization with the output of the image data digital signal 1a from
It is output as b.

When the input image attribute signal 1b is "1" (brightness range expansion instruction), the image data converting means 16 expands the brightness range of the input image data digital signal 1a and displays the display data analog signal. 1c is created and output. When the input image attribute signal 1b is "0" (without a brightness range expansion instruction), the display data analog signal 1c is created and output without expanding the brightness range of the input image data digital signal 1a. By the display data analog signal 1c, the display device 17 outputs an image on the monitor screen.

In this way, since the luminance range of the moving image or still image is expanded, a more natural image with clear contrast is displayed. In addition, since a CG image such as a character image is displayed without expanding the luminance range, a conventional glaring and easy-to-read image can be obtained.

Next, the image data conversion means will be described in more detail.

FIG. 5 shows the configuration of the image data conversion means 16 according to this embodiment. In FIG. 5, 21 is a color conversion unit, 22 is a brightness conversion unit, 23 is a data selection unit,
Reference numeral 24 is a D / A conversion means.

Here, the image data digital signal 1a
Are red (hereinafter referred to as “R”), green (hereinafter referred to as “G”), and blue (hereinafter referred to as “B”) 8 bits each (total 2)
It is assumed to be a 4-bit digital signal. The image attribute signal 1b is assumed to be a digital signal having 1-bit data of "1" (instruction of brightness range expansion) or "0" (no instruction of brightness range expansion).

As shown in FIG. 6, the color conversion means 21 uses a color correspondence table showing the correspondence of color conversion for each color (R, G, B).
Have each. Each color correspondence table has 256
Has an entry of (= 2 ^8), the color data after color conversion (8 bits) is set in each entry. Color conversion is
An entry in each color correspondence table is selected according to the value of the input image data digital signal 1a, the color data set in the selected entry is read, and the read three color data are combined to perform color conversion. It is realized by being output as the post-image data digital signal 2a. The color data of each entry of the color correspondence table can be arbitrarily set by the central processing unit 11 by the table update signal 1d, and γ correction (correct the color of the entire image according to the characteristics of the display device). And color tone conversion can be performed.

The brightness converting means 22 is, as shown in FIG.
A brightness correspondence table showing correspondence of brightness conversion is displayed for each color (R,
G, B) have each. Each luminance correspondence table has 256 entries, and color data (9 bits) after luminance conversion is set in each entry. The color data of each entry of the brightness correspondence table can be arbitrarily set by the central processing unit 11 by the table update signal 1d.

In the brightness conversion, the entry of each brightness correspondence table is selected according to the value of the input color-converted image data digital signal 2a, and the color data set in the selected entry is read and read. It is realized by combining the other three color data and outputting the image data digital signal 2b after the luminance conversion. R,
By converting the 8-bit color-converted image data digital signal 2a for each of G and B into the 9-bit luminance-converted image data digital signal 2b for each of R, G, and B, the brightness range can be expanded up to twice. it can.

The data selecting means 23 inputs the color-converted image data digital signal 2a, the luminance-converted image data digital signal 2b and the image attribute signal 1b. When the value of the image attribute signal 1b is "1" (luminance range expansion instruction), the luminance-converted image data digital signal 2b is selected, while the value of the image attribute signal is "0" (no luminance range expansion instruction). In this case, the color-converted image data digital signal 2a is selected and output. Image data digital signal after color conversion 2
When a is selected, 0 is added to the most significant bit of each data of R, G, B and output as a 9-bit signal for each of R, G, B.

The signal output from the data selecting means 23 is D
Input to the A / A conversion means 24, D / A conversion is performed on each of R, G, B with 9-bit precision, and display data analog signal 1
It is output as c.

As described above, the image data converting means 16 according to the present embodiment can expand the brightness range of an image requiring expansion of the brightness range up to a maximum of 2 times. Further, since the color data set in the entry of the brightness correspondence table of the brightness conversion means 22 is not limited to 9 bits, a free brightness range expansion rate can be realized as needed.

Further, in the present embodiment, only the information as to whether or not the brightness range needs to be expanded is stored as the image attribute, but the expansion ratio of the brightness range required by each area of the video memory is also imaged. There is also an embodiment in which it is stored as an attribute and the brightness range is expanded by a plurality of expansion rates. Figure 8
The image data conversion means 16 according to an embodiment in this case is shown. It has a plurality of brightness conversion means 31 having different expansion ratios of the brightness range, and has the color-converted image data digital signal 2a.
Also, one signal is selected and output from the signals output by the plurality of luminance conversion means 31 in accordance with the instruction of the image attribute signal 1b.

(Embodiment 2) Here, an embodiment in which an image data conversion means having a configuration different from that of Embodiment 1 is used will be described. The system configuration and operation of the multi-window device are the same as those shown in the first embodiment.

FIG. 9 shows the configuration of the image data conversion means 16 according to this embodiment. In FIG. 9, 41 is the first
Is a color conversion means, 42 is a second color conversion means, 43 is a data selection means, and 24 is a D / A conversion means.

At this time, when the image data digital signal 1a output from the video memory 14 in which the images as shown in FIG. 3 are stored, when outputting a still image of a landscape and a moving image of a rocket, , R, G, B
These are 8-bit digital signals (24 bits in total), and when outputting character images and images in other areas, 8-bit data representing colors and dummy data 16
It is assumed that the digital signal is a bit (total of 24 bits). The former is called a full color signal and the latter is called a pseudo color signal. The image attribute signal 1b is a digital signal having 1-bit data of "1" (instruction of brightness range expansion) or "0" (no instruction of brightness range expansion).

As shown in FIG. 10, the first color conversion means 41 uses the color correspondence table showing the correspondence of color conversion for each color (R,
G, B) have each. The color correspondence table has 256 entries, and color data (8 bits) after color conversion is set in each entry by the table update signal 1d from the central processing unit 11. The color conversion is performed by selecting an entry in each color correspondence table using 8-bit data representing the color of the input image data digital signal 1a and reading the color data set in the selected entry. The generated three color data are combined to form a first color-converted image data digital signal 4
It is realized by outputting as a. The first color conversion unit 41 can convert the pseudo color signal into a full color signal together with the color conversion.

As shown in FIG. 11, the second color conversion means 42 uses a color correspondence table showing the correspondence of color conversion for each color (R,
G, B) have each. Each color correspondence table has 256 entries, and color data (9 bits) after color conversion is set in each entry by a table update signal 1d from the central processing unit 11. In the color conversion, an entry of each color correspondence table is selected according to the value of the input image data digital signal 1a, the color data set in the selected entry is read, and the read three color data are combined. By being output as the second color-converted image data digital signal 4b,
Will be realized. The second color conversion means 42 converts the 8-bit full color signal of each of R, G, B into the second color-converted image data digital signal 4b of each of R, G, B of 9 bits, thereby performing color conversion. The brightness range can be expanded up to 2 times.

The data selecting means 43 inputs the first color-converted image data digital signal 4a, the second color-converted image data digital signal 4b and the image attribute signal 1b. When the image attribute signal 1b is "1" (brightness range expansion instruction), the second color-converted image data digital signal 4b is selected, while the image attribute signal 1b is "0" (no brightness range expansion instruction). At this time, the first color-converted image data digital signal 4a is selected and output. When the first color-converted image data digital signal 4a is selected, R, G, B
By adding 0 to the most significant bit of each data, R, G,
B is output as a 9-bit signal.

The signals (R, G,
9 bits each for B) is input to the D / A conversion means 24,
Each of R, G and B is D / A converted with 9-bit precision and output as a display data analog signal 1c.

As described above, by performing color conversion separately for an image that requires expansion of the brightness range and an image that does not require expansion, brightness adjustment for displaying a screen that is easier to see is possible. Becomes

Further, in the present embodiment, the character image is represented by the pseudo color signal, but it may be represented by the full color signal like the camera image.

Example 3 In this example, Examples 1 and 2 are used.
An embodiment of the image data conversion means having a configuration different from that will be described. The system configuration and operation of the multi-window device are the same as those shown in the first embodiment.

FIG. 12 shows the configuration of the image data conversion means 16 according to this embodiment. In FIG. 12, 21 is a color conversion means, 51 is a first D / A conversion means, and 52 is a second.
D / A conversion means, and 53 is a data selection means.

Here, the image data digital signal 1a output from the video memory is 8 for each of R, G and B.
It is assumed that the digital signal is a bit (total of 24 bits). Further, the image attribute signal 1b is assumed to be a digital signal having 1-bit data of "1" (brightness range expansion instruction) or "0" (no brightness range expansion instruction).

The color conversion means 21 is the same as that described in the first embodiment, and has the structure shown in FIG. The result of color conversion is output as the color-converted image data digital signal 2a.

The first D / A conversion means 51 D / A converts each of the R, G, and B data of the color-converted image data digital signal 2a with 8-bit precision, and outputs the first image data analog signal 5a. Output as. Here, the first D
It is assumed that the maximum output level of the / A conversion means 51 is set to 1V. That is, when the value of the input color-converted image data digital signal 2a is 255, the maximum output of 1V is output as the first image data analog signal 5a.

The second D / A conversion means 52 D / A-converts the R, G, and B data of the color-converted image data digital signal 2a with 8-bit precision, and outputs the second image data analog signal 5b. Output as. Here, the second D
It is assumed that the maximum output level of the / A conversion means 52 is set to 2V. That is, when the value of the input color-converted image data digital signal 2a is 255, the maximum output of 2V is output as the second image data analog signal 5b.

Same color converted image data digital signal 2
Since the output of the second image data analog signal 5b is twice as large as that of the first image data analog signal 5a, the second image data analog signal 5b is larger than the first image data analog signal 5a. Therefore, a double luminance range can be expressed.

The data selecting means 53 includes a first image data analog signal 5a and a second image data analog signal 5
b and the image attribute signal 1b are input. The data selecting means 53 selects the second image data analog signal 5b when the image attribute signal 1b is "1" (brightness range expansion instruction), while the value of the image attribute signal 1b is "0" (brightness range expansion instruction). (No), the first image data analog signal 5a is selected and the selected analog signal is output as the display data analog signal 1c.

As described above, the brightness for expanding the brightness range in the second D / A conversion means 52 is increased only when the image requires the expansion of the brightness range. Adjustment is possible.

Further, by enlarging the luminance range by using the D / A conversion means, the quantization error which is unavoidable when enlarging the luminance range in the digital signal as in the first and second embodiments is unavoidable. Can be prevented.

Further, in the present embodiment, only the information as to whether or not the brightness range is expanded is stored as the image attribute, but the expansion ratio of the brightness range required by each area of the video memory is also stored as the image attribute. However, there is an example in which the brightness range is expanded by a plurality of expansion rates. FIG. 13 shows the image data conversion means 16 according to an embodiment in this case. Having a plurality of D / A converting means 61 having different brightness expansion rates, and selecting one signal from the analog signals output by the plurality of D / A converting means 61 according to the instruction of the image attribute signal 1b, Output as the display data analog signal 1c.

(Fourth Embodiment) Here, a description will be given of an embodiment using an image data converting means having a configuration different from those of the first, second and third embodiments. The system configuration and operation of the multi-window device are the same as those shown in the first embodiment.

FIG. 14 shows the configuration of the image data conversion means 16 according to this embodiment. In FIG. 14, 21 is a color conversion means, 24 is a D / A conversion means, and 71 is an amplification means.

Here, the image data digital signal 1a
Is an 8-bit digital signal for each of R, G, and B. Further, the image attribute signal 1b is 1 of "1" (instruction of brightness range expansion) or "0" (no instruction of brightness range expansion).
It is assumed that the digital signal has bit data.

The color conversion means 21 is the same as that described in the first embodiment, and has the structure shown in FIG. The result of color conversion is output as the color-converted image data digital signal 2a.

The D / A conversion means 24 D / A-converts each of R, G, and B data of the color-converted image data digital signal 2a with 8-bit precision and outputs it as an image data analog signal 7a. Here, it is assumed that the maximum output level of the D / A conversion means 24 is set to 1V. That is, the input color-converted image data digital signal 2a
, The maximum output of 1V is output as the image data analog signal 7a.

The amplifying means 71 receives the image data analog signal 7a and the image attribute signal 1b, amplifies the image data analog signal 7a and outputs it as the display data analog signal 1c. The amplification factor can be controlled by the value of the image attribute signal 1b. For example, the image attribute signal 1b is "1".
When "(brightness range expansion instruction) is given, the signal is amplified twice, and when the value of the image attribute signal 1b is" 0 "(no brightness range instruction is given), it is not amplified. By controlling, the brightness range of the image data can be expanded only when the image attribute signal 1b is "1".

As described above, after the color conversion and D / A conversion are uniformly performed on all the image data, only the image data for which the expansion of the luminance range is instructed is signaled by the amplifying means 71. By amplifying the level and expanding the brightness range, it is possible to adjust the brightness for displaying a screen that is easier to see.

Further, since the amplification range is expanded by using the amplifying means, the occurrence of the quantization error, which is unavoidable when the expansion process of the brightness range is performed on the digital signal as in the first and second embodiments, is prevented. be able to.

(Embodiment 5) The embodiment described above is
The brightness conversion is performed on the image data stored in the video memory when the image data is displayed on the screen. On the other hand, an example in which the brightness conversion is not performed when the image data is displayed on the screen, but the brightness conversion is performed when the image data is stored in the video memory, and the image data output from the video memory is directly displayed on the screen. There is also. Such an embodiment will be described below.

FIG. 15 shows the system configuration of the multi-window device according to this embodiment. In FIG.
Reference numeral 81 is a central processing unit, 82 is a main memory, 83 is a graphics control means, 84 is a first image data conversion means, 85 is an attribute storage means, 86 is a video memory, 87 is a second image data conversion means, 88 Is a display device, 8
1, 82, 83, 84, 85, 86 and 87 constitute an image synthesizing means.

The central processing unit 81 executes the programs stored in the main memory 82, and the video memory 86
Command to the graphics control means 83
The conversion content of the first image data conversion means 84 is set, the storage content of the attribute storage means 85 is set, and the output of the image attribute signal 8b is controlled.

In addition to programs, the main memory 82
The image data to be displayed is stored in the form of digital data of 8 bits (total 24 bits) for each of R, G and B. The graphics control means 83 is the central processing unit 81.
In response to the instruction from the CPU, the image data is read from the main memory 82, written to the video memory 86, and the image data is output from the video memory 86.

The attribute storage means 85 stores, as an image attribute, information corresponding to each area of the image data stored in the main memory 82, whether or not the area requires expansion of the luminance range. And outputs the image attribute corresponding to the image data output from the main memory 82.

The first image data conversion means 84 inputs the pre-brightness adjustment image data digital signal 8a output from the main memory 82 and the image attribute signal 8b output from the attribute storage means 85, and inputs them to the video memory 86. The brightness-adjusted image data digital signal 8c is output.

In the present embodiment, the video memory 86 is assumed to be able to store image data of 9 bits for each of R, G and B. Image data digital signals are output from the video memory 86.

The second image data conversion means 87 carries out D / A conversion of the image data digital signal output from the video memory 86 with a precision of 9 bits and outputs it as a display data analog signal. The display device 88 displays an image on the monitor screen by the display data analog signal output from the second image data conversion means 87.

Now, in the main memory 82, image data of a character image, a still image of a landscape, and a moving image of a rocket as shown in FIG. 3 are stored in an address arrangement as shown in FIG. Be present. As for this image data, the central processing unit 81 uses the graphics control means 83.
Is output as a digital signal 8a before image data for brightness adjustment.

At this time, in the attribute storage means 85, "1" is stored as an image attribute corresponding to the still image and the moving image, and "0" is stored as the image attribute corresponding to the other image. Of the stored image attributes, the image attribute corresponding to the image data currently output from the main memory 82 is output as the image attribute signal 8b.

When the input image attribute signal 8b is "1" (brightness range expansion instruction), the first image data converting means 84 expands the brightness range of the input pre-adjustment image data digital signal 8a. Then, the brightness-adjusted image data digital signal 8c is created and output. Image attribute signal 1b
Is "0" (without a brightness range expansion instruction), the brightness-adjusted image data digital signal 8c is created and output without expanding the brightness range of the brightness-unadjusted image data digital signal 8a. The video memory 86 receives and stores the brightness-adjusted image data digital signal 8c.

In this way, since the luminance range of the moving image or the still image is expanded, a more natural image with clear contrast is displayed. In addition, since the brightness range of a CG image such as a character image is not expanded, an easy-to-read image without glare as in the conventional case can be obtained.

Next, the first image data converting means will be described in more detail.

FIG. 17 shows the structure of the first image data converting means 84 according to this embodiment. In FIG.
Reference numeral 91 is a color conversion unit, 92 is a luminance conversion unit, and 93 is a data selection unit.

Here, it is assumed that the pre-luminance correction image data digital signal 8a is a digital signal having 8-bit data for each of R, G and B. Also, the image attribute signal 1b
Is a digital signal having 1-bit data of "1" (brightness range expansion instruction) or "0" (no brightness range expansion instruction).

The color conversion means 91 has a color correspondence table showing the correspondence of color conversion for each color (R, G, B), similarly to the color conversion means 21 shown in FIG. Each color correspondence table has 256 (= 2 ⁸ ) entries, and color data (8 bits) after color conversion is set in each entry. In color conversion, an entry of each color correspondence table is selected according to the value of the input image data digital signal 8a before brightness adjustment, the color data set in the selected entry is read, and the read three colors are read. This is realized by combining the data and outputting the image-converted image data digital signal 9a. The color data of each entry of the color correspondence table can be arbitrarily set by the table update signal 8d from the central processing unit 81, and γ correction (correct the color of the entire image according to the characteristics of the display device). And color tone conversion can be performed.

The brightness conversion means 92 has a brightness correspondence table showing the correspondence of the brightness conversion for each color (R, G, B) similarly to the brightness conversion means 22 shown in FIG. Each luminance correspondence table has 256 entries, and the color data (9 bits) after luminance conversion is set in each entry. The color data of each entry in the luminance correspondence table is
It can be arbitrarily set by the table updating signal 8d from the central processing unit 81.

In the brightness conversion, an entry of each brightness correspondence table is selected according to the value of the input color-converted image data digital signal 9a, and the color data set in the selected entry is read and read. It is realized by combining the other three color data and outputting as the image data digital signal 9b after the luminance conversion. R,
By converting the 8-bit color image-converted image data digital signal 9a for each of G and B into the brightness-converted image data digital signal 9b of 9-bit for each of R, G, B, it is possible to expand the luminance range up to twice. it can.

The image data digital signal 9a after color conversion, the image data digital signal 9b after luminance conversion, and the image attribute signal 8b are input to the data selecting means 93. When the value of the image attribute signal 8b is "1" (luminance range expansion instruction), the data selecting means 93 selects the image data digital signal 9b after luminance conversion, while the value of the image attribute signal 8b is "0" (luminance). When the range expansion instruction is not given), the color-converted image data digital signal 9a is selected and output. When selecting the color-converted image data digital signal 9a,
0 is added to the most significant bit of each of the R, G, and B data and output as a 9-bit signal for each of R, G, and B.

The signal output from the data selecting means 93 is input to the video memory 86 as the brightness-adjusted image data digital signal 8c.

As described above, the first image data conversion means 84 in this embodiment can expand the brightness range of an image requiring expansion of the brightness range up to a maximum of 2 times. Further, the color data set in the entry of the brightness correspondence table of the brightness conversion means 92 and the image data stored in the video memory are not limited to 9 bits, so that the brightness range expansion ratio can be freely set as necessary. Can be realized.

Further, in the present embodiment, only the information as to whether or not the brightness range needs to be expanded is stored as an image attribute, but the expansion ratio of the brightness range required by each area of the main memory is stored in the image. There is also an embodiment in which it is stored as an attribute and the brightness range is expanded by a plurality of expansion rates. Figure 1
Reference numeral 8 denotes the first image data conversion means 84 according to the embodiment in this case. Having a plurality of brightness conversion means 94 having different expansion ratios of the brightness range, one of the signals output from the color-converted image data digital signal 9a and the plurality of brightness conversion means 94 according to the instruction of the image attribute signal 8b. Is selected and output.

In the present embodiment, the attribute storage means 85 and the main memory 82 are described as separate components.
A configuration in which the image attributes are stored in the main memory 82 is also conceivable. FIG. 19 shows the attribute storage means 85 in this case. In FIG. 19, the attribute storage means 85 is composed of a part of the main memory 82 and an attribute output register 89, and the image data from the main memory 82 is stored in the first memory.
When output to the image data converting means 84, the image attribute corresponding to this image data is set in the attribute output register 89, and this image attribute is output to the first image data converting means 84 as the image attribute signal 8b. .

(Sixth Embodiment) Here, an embodiment using the first image data converting means having a different configuration from the fifth embodiment will be described. The system configuration and operation of the multi-window device are the same as those shown in the fifth embodiment.

FIG. 20 shows the structure of the first image data converting means 84 according to this embodiment. In FIG. 20,
101 is a first color conversion unit, 102 is a second color conversion unit, and 103 is a data selection unit.

At this time, when the image data digital signal 8a output from the main memory 82 storing the image shown in FIG. 3 is output when a still image of a landscape and a moving image of a rocket are output. , R, G, B are 8-bit digital signals (total of 24 bits), and when outputting character images and images in other areas, 8-bit representing color and 16 bits of dummy data (total of 24 bits) Of digital signals.
The former is called a full color signal and the latter is called a pseudo color signal.
In addition, the image attribute signal 8b is "1" (instruction for expanding brightness range).
Alternatively, it is assumed that it is a digital signal having 1-bit data of "0" (without a brightness range expansion instruction).

Similar to the first color converting means 41 in the second embodiment shown in FIG. 10, the first color converting means 101 creates a color correspondence table showing the correspondence of color conversion for each color (R, G, B). I have Each color correspondence table has 256 entries, and color data (8 bits) after color conversion is set in each entry by a table update signal 8d from the central processing unit 81. In color conversion, an entry of each color correspondence table is selected according to the value of the input image data digital signal 8a before luminance conversion, the color data set in the selected entry is read, and the read three colors are read. This is realized by combining the data and outputting it as the first color-converted image data digital signal 10a. Here, the pseudo color signal can be converted into a full color signal together with the color conversion.

The second color conversion means 102, similarly to the second color conversion means 42 in the second embodiment shown in FIG. 11, creates a color correspondence table showing correspondence of color conversion for each color (R, G, B). I have Each color correspondence table has 256 entries, and color data (9 bits) after color conversion is set in each entry by a table update signal 8d from the central processing unit 81. In color conversion, an entry of each color correspondence table is selected according to the value of the input image data digital signal 8a before brightness adjustment, the color data set in the selected entry is read, and the read three colors are read. It is realized by combining the data and outputting the image data digital signal 10b after the second color conversion. Here, by converting a full color signal of 8 bits each of R, G and B into a second color-converted image data digital signal 10b of 9 bits each of R, G and B,
The brightness range can be expanded up to twice as much as the color conversion.

The first color-converted image data digital signal 10a, the second color-converted image data digital signal 10b, and the image attribute signal 8b are input to the data selecting means 103. The data selection means 103 uses the image attribute signal 8
When "b" is "1" (instruction to expand the brightness range), the second color-converted image data digital signal 10b is selected, while the value of the image attribute signal 8b is "0" (no instruction to expand the brightness range).
In the case of, the first color-converted image data digital signal 10
Select a and output. When the first color-converted image data digital signal 10a is selected, 0 is added to the most significant bit of each of R, G, and B data and output as a 9-bit signal for each of R, G, and B.

The signal output by the data selecting means is input to the video memory 86 as the brightness-adjusted image data digital signal 8c.

As described above, by performing color conversion separately for an image that requires expansion of the brightness range and an image that does not require expansion, brightness adjustment for displaying a screen that is easier to see is possible. Becomes

Further, in the present embodiment, the character image is expressed by the pseudo color signal, but it may be expressed by the full color signal like the camera image.

In the above-mentioned six embodiments, the table conversion method is used as the color conversion means and the brightness conversion means, but the present invention is not limited to this, and other methods such as the use of multipliers are also possible. The brightness conversion means and the color conversion means can also be realized. Further, although the one in which a memory is used as the attribute storage means has been described, the present invention is not limited to this, and other methods such as a method of using a register for storing coordinates indicating an image area and image attributes It is also possible to realize the attribute storage means by.

[0157]

As described above, according to the multi-window device of the first aspect of the present invention, an image requiring a wide range of brightness is displayed on the screen with the brightness range enlarged.
Since an image that should be displayed in the normal brightness range is displayed on the screen without expanding the brightness range, it is possible to display a screen which is neither dark nor dazzling in all windows and which is very easy for the human eye to see.

According to the multi-window device of the second aspect of the invention, an image requiring a wide range of brightness such as a still image of a landscape or a video moving image is displayed on the screen with its brightness range expanded. Images that need to be displayed in the normal brightness range, such as character images, are displayed on the screen without expanding the brightness range, so they are not dark or dazzling in all windows, and are very visible to the human eye. The screen can be displayed.

According to the multi-window device of the present invention, the input image data is stored in the video memory, and at the same time, the information as to whether or not the luminance range needs to be expanded is used as the image attribute. It is stored in the attribute storage means. At this time, the image data conversion means determines the value of the display data analog signal corresponding to the image data requiring the expansion of the brightness range based on the stored image attributes, and the image data not requiring the expansion of the brightness range. Since it is larger than the display data analog signal corresponding to, it is possible to display a screen that is not dark or dazzling in all windows and is very easy for the human eye to see, regardless of the type of image data.

According to the multi-window device of the eighth and ninth aspects of the invention, the input image data is stored in the video memory, and at the same time, the luminance is added to the information indicating whether or not the luminance range needs to be expanded. The range expansion rate is stored in the attribute storage means as an image attribute. At this time, the image data conversion means determines the value of the display data analog signal corresponding to the image data requiring the expansion of the brightness range based on the stored image attributes, and the image data not requiring the expansion of the brightness range. Display data corresponding to the analog signal is increased according to the enlargement ratio of the given luminance range, so it is neither dark nor dazzling in all windows, regardless of the type of image data, and very easy for the human eye to see. The screen can be displayed.

According to the multi-window device of the present invention, the input image data is stored in the main memory, and at the same time, information as to whether or not the luminance range needs to be expanded is used as an image attribute. It is stored in the attribute storage means. At this time, the first image data conversion means requires the value of the image data digital signal corresponding to the image data requiring the expansion of the brightness range to be based on the stored image attribute, and requires the expansion of the brightness range. Since the image data corresponding to the image data is made larger than the digital signal,
Regardless of the type of image data, it is possible to display a screen that is not dark or dazzling in all windows and is very easy for the human eye to see.

According to the multi-window device of the thirteenth aspect of the present invention, the input image data is stored in the main memory, and at the same time, in addition to the information as to whether or not the brightness range needs to be expanded, The enlargement ratio is stored in the attribute storage means as an image attribute. At this time, the first image data conversion means requires the value of the image data digital signal corresponding to the image data requiring the expansion of the brightness range to be based on the stored image attribute, and requires the expansion of the brightness range. The image data corresponding to the image data is increased in accordance with the enlargement ratio of the given luminance range as compared with the digital signal, so it is neither dark nor dazzling in all windows regardless of the type of image data. A very easy-to-read screen can be displayed.

According to the image data conversion device of the fourteenth to eighteenth aspects, the image data digital signal output from the video memory and the image indicating whether or not to expand the luminance range output from the attribute storage means. Based on the attribute signal, the value of the display data analog signal corresponding to the image data instructed to expand the luminance range is larger than that of the display data analog signal corresponding to the image data not instructed to expand the luminance range. Since it is made large, the multi-window device using this device can display a screen that is not too dark or dazzling in all windows and is very easy for the human eye to see, regardless of the type of image data.

According to the image data conversion device of the present invention, the image data digital signal output from the video memory and the attribute storage means are output.
The value of the display data analog signal corresponding to the image data for which the expansion of the brightness range is instructed is based on the image attribute signal that indicates whether or not to expand the brightness range and also instructs the expansion ratio of the brightness range. Compared with the display data analog signal corresponding to the image data for which the expansion of the brightness range is not instructed, it is increased according to the expansion ratio of the brightness range. , It can display a screen that is not too dark or dazzling in all windows, which is very easy for the human eye to see.

According to the image data conversion device of the twenty-second to twenty-fourth aspects of the present invention, it is possible to determine whether or not the image data digital signal before brightness adjustment output from the main memory and the brightness range output from the attribute storage means are expanded. The value of the display data analog signal corresponding to the image data for which the expansion of the luminance range is instructed is the display data analog signal corresponding to the image data for which the expansion of the luminance range is not instructed based on the instructed image attribute signal. The multi-window device using this device can display a screen that is not too dark or dazzling in all windows and is very easy for the human eye to see, regardless of the type of image data.

According to the image data conversion apparatus of the twenty-fifth to twenty-sixth aspects, whether or not the brightness range before the brightness adjustment image data digital signal outputted from the main memory and the brightness range outputted from the attribute storage means are expanded or not. Based on the image attribute signal that also indicates the magnification ratio of the brightness range
The value of the display data analog signal corresponding to the image data for which the expansion of the brightness range is instructed depends on the expansion ratio of the brightness range compared to the display data analog signal for the image data for which the expansion of the brightness range is not instructed. Since it is made large, the multi-window device using this device can display a screen that is not too dark or dazzling in all windows and is very easy for the human eye to see, regardless of the type of image data.

[Brief description of drawings]

FIG. 1 is a graph showing a distribution of the number of pixels with respect to luminance in each image data according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram of a multi-window device according to Examples 1 to 4 of the present invention.

FIG. 3 is an example of image data displayed on a screen.

FIG. 4 is a diagram showing image attributes related to the image data of FIG.

FIG. 5 is a configuration diagram of image data conversion means according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram of a color conversion unit according to Examples 1, 3, 4 and 5 of the present invention.

FIG. 7 is a configuration diagram of luminance conversion means according to the first and fifth embodiments of the present invention.

FIG. 8 is a configuration diagram of an image data conversion unit according to the first embodiment of the present invention, the image data conversion unit having a plurality of brightness conversion units.

FIG. 9 is a configuration diagram of an image data conversion unit according to a second embodiment of the present invention.

FIG. 10 is a configuration diagram of a first color conversion unit according to Examples 2 and 6 of the present invention.

FIG. 11 is a configuration diagram of a second color conversion unit according to Examples 2 and 6 of the present invention.

FIG. 12 is a configuration diagram of an image data conversion unit according to a third embodiment of the present invention.

FIG. 13 is a configuration diagram of an image data conversion unit according to a third embodiment of the present invention, the image data conversion unit having a plurality of D / A conversion units.

FIG. 14 is a configuration diagram of image data conversion means according to a fourth embodiment of the present invention.

FIG. 15 is a system configuration diagram of a multi-window device according to fifth and sixth embodiments of the present invention.

FIG. 16 is an address space diagram of a main memory in a multi-window device according to embodiments 5 and 6 of the present invention.

FIG. 17 is a configuration diagram of a first image data conversion unit according to a fifth embodiment of the present invention.

FIG. 18 is a configuration diagram of a first image data conversion unit according to a fifth embodiment of the present invention, which is a first image data conversion unit having a plurality of brightness conversion units.

FIG. 19 is a configuration diagram of attribute storage means in a multi-window device according to fifth and sixth embodiments of the present invention.

FIG. 20 is a configuration diagram of a first image data conversion unit according to a sixth embodiment of the present invention.

FIG. 21 is a system configuration diagram of a multi-window device according to a conventional technique.

FIG. 22 is a configuration diagram of an image data conversion unit according to a conventional technique.

FIG. 23 is a graph showing a distribution of the number of pixels with respect to luminance in each image data according to the related art.

[Explanation of symbols]

 11 central processing unit 12 main memory 13 graphics control means 14 video memory 15 attribute storage means 16 image data conversion means 17 display device 1a image data digital signal 1b image attribute signal 1c display data analog signal 1d table update signal 21 color conversion means 22 Luminance conversion means 23 Data selection means 24 D / A conversion means 2a Image data digital signal after color conversion 2b Image data digital signal after luminance conversion 31 Plural brightness conversion means 32 Data selection means 41 First color conversion means 42 Second Color conversion means 43 Data selection means 4a First color-converted image data digital signal 4b Second color conversion degree image data digital signal 51 First D / A conversion means 52 Second D / A conversion means 53 Data selection Means 5a First image data analog Signal 5b Second image data analog signal 61 Plural D / A conversion means 62 Data selection means 71 Amplification means 7a Image data analog signal 81 Central processing unit 82 Main memory 83 Graphics control means 84 First image data conversion means 85 Attribute storage unit 86 Video memory 87 Image data conversion unit 88 Display device 89 Attribute output register 8a Image data digital signal before brightness correction 8b Image attribute signal 8c Image data digital signal after brightness adjustment 8d Table update signal 91 Color conversion unit 92 Brightness conversion unit 93 data selecting means 94 plural luminance converting means 95 data selecting means 9a color-converted image data digital signal 9b luminance-converted image data digital signal 101 first color converting means 102 second color converting means 103 data selecting means 1 a first image data digital signal after color conversion 10b second image data digital signal after color conversion 201 central processing unit 202 main memory 203 graphics control means 204 video memory 205 image data conversion means 206 display device 20a image data digital signal 20b Display data analog signal 20c Table update signal 211 Color conversion means 212 D / A conversion means 21a Color converted image data digital signal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G06T 11/00 G09G 5/14 Z 9471-5G 9365-5L G06F 15/72 K

Claims (26)

[Claims] 1. An image synthesizing means for synthesizing a plurality of images,
In a multi-window device including a display device for displaying an image synthesized by the image synthesizing unit on a screen, the image synthesizing unit needs to enlarge a luminance range and a first image and a luminance range. A multi-window device that distinguishes from a second image that does not have an image and expands and combines only the luminance range of the first image. 2. The multi-window device according to claim 1, wherein the first image is an image captured by a camera, and the second image is an image created by a computer. 3. The image synthesizing means has a plurality of storage areas for respectively storing a plurality of image data, and a video memory for outputting the image data stored in each storage area as an image data digital signal, and a luminance. Information on whether or not the range needs to be expanded is stored as an image attribute for each of the storage areas, and when the image attribute indicates that the brightness range needs to be expanded, an instruction to expand the brightness range is given. And an attribute storage unit that outputs an image attribute signal that does not instruct the expansion of the brightness range when the image attribute indicates that the brightness range does not need to be expanded; and an image data digital signal output from the video memory. An image attribute signal output from the attribute storage means is input, and a display data analog signal for displaying an image on the display device is created. Image data conversion means for outputting to the display device and increasing the brightness value of the display data analog signal only when the image attribute signal indicates expansion of the brightness range. The multi-window device according to claim 1, wherein 4. The brightness conversion means for performing a conversion for expanding the brightness range of the input image data digital signal, and outputting the conversion result as a brightness-converted image data digital signal. The image data digital signal, the luminance-converted image data digital signal and the image attribute signal are input,
When the image attribute signal indicates expansion of the brightness range, the image data digital signal after the brightness conversion is selected, while when the image attribute signal does not indicate expansion of the brightness range, the image data digital signal is selected. And a data selecting means for outputting the data, and D / A converting the image data digital signal output from the data selecting means or the image data digital signal after luminance conversion, and outputting the conversion result as the display data analog signal. The multi-window device according to claim 3, further comprising D / A conversion means. 5. The first color conversion means for performing color conversion on the input image data digital signal and outputting the conversion result as a first color-converted image data digital signal. Second color conversion means for performing color conversion and conversion for expanding the luminance range on the input image data digital signal, and outputting the conversion result as a second color-converted image data digital signal. When the first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input, and the image attribute signal indicates expansion of the luminance range, While the second color-converted image data digital signal is selected, when the image attribute signal does not instruct to expand the luminance range, the first color-converted image data is selected. Data selecting means for selecting and outputting a digital digital signal, and D / A conversion for the first color-converted image data digital signal or the second color-converted image data digital signal output from the data selecting means. 4. The multi-window device according to claim 3, further comprising a D / A conversion unit that performs the conversion result and outputs the conversion result as the display data analog signal. 6. The image data conversion means D / s the input image data digital signal.
A first D / A conversion means for performing A conversion and outputting the conversion result as a first image data analog signal, and the first D / A conversion means for the input image data digital signal. Also performs a D / A conversion with a high maximum output signal level, and outputs a conversion result as a second image data analog signal, the first image data analog signal and the second image data analog signal. When the image data analog signal and the image attribute signal are input and the image attribute signal indicates expansion of the brightness range, the second image data analog signal is selected, while the image attribute signal expands the brightness range. When not instructing, the first image data analog signal is selected, and the selected signal is output as the display data analog signal. Claim 3, wherein
The multi-window device described in. 7. The image data conversion means D / s the input image data digital signal.
A D / A conversion unit that performs A conversion and outputs the conversion result as an image data analog signal, and the image data analog signal and the image attribute signal are input, and the input image data analog signal is the image attribute signal. Amplifies with a relatively high amplification factor when indicates the expansion of the brightness range, and amplifies with a relatively low amplification factor when the image attribute signal does not instruct the expansion of the brightness range, and outputs the amplification result. The multi-window device according to claim 3, further comprising: an amplifying unit that outputs the display data analog signal. 8. The attribute storage means, in addition to information on whether or not it is necessary to expand the luminance range,
The expansion ratio of the brightness range is also stored as an image attribute for each storage area. When the image attribute indicates that the brightness range needs to be expanded, the expansion of the brightness range is instructed and the expansion ratio of the brightness range is also indicated. Also outputs the image attribute signal that does not instruct the expansion of the brightness range when the image attribute indicates that it is not necessary to expand the brightness range. A plurality of brightness conversion means for performing conversion for expanding the brightness range of the signal and outputting the conversion results as brightness-converted image data digital signals, respectively, the image data digital signal and the brightness-converted image data digital signals And the image attribute signal are input, and the image data digital signal and the composite signal are input in accordance with the instruction of the image attribute signal. Data selection means for selecting one digital signal from the luminance-converted image data digital signals and D / A conversion for the digital signal selected by the data selection means, and the conversion result is the display data. The multi-window device according to claim 3, further comprising a D / A conversion unit that outputs as an analog signal. 9. The attribute storage means, in addition to information on whether or not it is necessary to expand the luminance range,
The expansion ratio of the brightness range is also stored as an image attribute for each storage area. When the image attribute indicates that the brightness range needs to be expanded, the expansion of the brightness range is instructed and the expansion ratio of the brightness range is also indicated. Also outputs the image attribute signal that does not instruct the expansion of the brightness range when the image attribute indicates that it is not necessary to expand the brightness range. A plurality of D / A conversion means for respectively performing D / A conversion with different maximum output signal levels on the signals and outputting the conversion results as image data analog signals, a plurality of the image data analog signals and the image attribute signals Is input, and one analog signal is selected from a plurality of the image data analog signals according to the instruction of the image attribute signal. Multi-window apparatus according to the selected analog signal to claim 3, characterized in that it comprises a data selection means for outputting as said display data analog signals. 10. The main memory, wherein the image synthesizing means has a plurality of storage areas for respectively storing a plurality of image data, and outputs the image data stored in each storage area as a pre-brightness adjustment image data digital signal. And the information as to whether or not the brightness range needs to be expanded is stored as an image attribute for each of the storage areas, and when the image attribute indicates that the brightness range needs to be expanded, the brightness range An attribute storage unit that outputs an image attribute signal that does not instruct the expansion of the brightness range when the expansion is instructed and the image attribute indicates that the brightness range does not need to be expanded; and a brightness adjustment output from the main memory. The previous image data digital signal and the image attribute signal output from the attribute storage means are input, and the luminance adjusted image data digital signal is output. Which is a first image data conversion means
Output from the first image data conversion means for increasing the brightness value of the brightness-adjusted image data digital signal only when the image attribute signal indicates expansion of the brightness range, and output from the first image data conversion means. A video memory that temporarily stores the brightness-adjusted image data digital signal as image data, and outputs the stored image data as an image data digital signal; and an image data digital signal output from the video memory is input. The multi-window device according to claim 1, further comprising a second image data conversion unit that creates and outputs a display data analog signal. 11. The first image data conversion means performs conversion for expanding a brightness range on the input pre-brightness adjustment image data digital signal, and outputs the conversion result as a post-brightness conversion image data digital signal. Brightness conversion means for inputting the pre-brightness-adjustment image data digital signal, the post-brightness conversion image data digital signal, and the image attribute signal, and the brightness when the image attribute signal indicates expansion of the brightness range. While selecting the converted image data digital signal, when the image attribute signal does not instruct to expand the brightness range, the pre-brightness adjustment image data digital signal is selected, and the selected signal is the brightness-adjusted image data. 11. The multi-win according to claim 10, further comprising a data selection unit that outputs as a digital signal. C devices. 12. The first image data conversion means performs color conversion on the input pre-luminance adjustment image data digital signal and outputs the conversion result as a first post-color conversion image data digital signal. First color conversion means, and color conversion is performed on the input pre-luminance adjustment image data digital signal, conversion is performed to expand the luminance range, and the conversion result is the second color-converted image data digital signal. A second color conversion means for outputting the first color-converted image data digital signal, the second color-converted image data digital signal and the image attribute signal, and the image attribute signal When the range expansion is instructed, the second color-converted image data digital signal is selected, while the image attribute signal does not instruct the brightness range expansion. 11. The data selecting means for selecting the first color-converted image data digital signal and outputting the selected signal as the brightness-adjusted image data digital signal. The described multi-window device. 13. The attribute storage means, in addition to information on whether or not it is necessary to expand the luminance range,
The expansion ratio of the brightness range is also stored as an image attribute for each storage area. When the image attribute indicates that the brightness range needs to be expanded, the expansion of the brightness range is instructed and the expansion ratio of the brightness range is also indicated. And the image attribute indicates that the brightness range does not need to be expanded, an image attribute signal that does not instruct expansion of the brightness range is output, and the first image data conversion unit outputs the input brightness. A plurality of brightness conversion means for performing conversion for expanding the brightness range on the pre-adjustment image data digital signal and outputting the conversion results as the brightness-converted image data digital signal, respectively, and the pre-adjustment image data digital signal and the plurality of brightness conversion means. The image data digital signal after the luminance conversion and the image attribute signal are input, and the luminance is not adjusted according to the instruction of the image attribute signal. Data selecting means for selecting one digital signal from the image data digital signal and the plurality of luminance-converted image data digital signals and outputting the selected digital signal as the luminance-adjusted image data digital signal. Claim 1 characterized by the above.
The multi-window device according to 0. 14. An image data digital signal output from a video memory which stores a plurality of image data in each of a plurality of storage areas, and information indicating whether or not a luminance range needs to be expanded. Output from the attribute storage unit that stores the image attribute for each, and when the image attribute indicates that the luminance range needs to be expanded, the luminance range is instructed to be expanded, while the image attribute indicates the brightness range. When it indicates that it is not necessary to enlarge, an image attribute signal that does not instruct the expansion of the luminance range is input, and a display data analog signal for displaying an image on the display device is created and output to the display device. In the image data conversion device, the brightness value of the display data analog signal is increased only when the input image attribute signal instructs expansion of the brightness range. Image data conversion apparatus characterized by Kusuru. 15. A brightness conversion means for converting the input image data digital signal to expand the brightness range and outputting the conversion result as a brightness-converted image data digital signal, the image data digital signal and the brightness conversion means. The image data digital signal after luminance conversion and the image attribute signal are input,
When the image attribute signal indicates expansion of the brightness range, the image data digital signal after the brightness conversion is selected, while when the image attribute signal does not indicate expansion of the brightness range, the image data digital signal is selected. And a data selecting means for outputting the data, and D / A converting the image data digital signal output from the data selecting means or the image data digital signal after luminance conversion, and outputting the conversion result as the display data analog signal. The image data conversion apparatus according to claim 14, further comprising a D / A conversion unit. 16. First color conversion means for performing color conversion on the input image data digital signal and outputting the conversion result as a first color-converted image data digital signal, and the input image. Second color conversion means for performing color conversion on the data digital signal and conversion for expanding the luminance range, and outputting the conversion result as a second color-converted image data digital signal; The converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal are input, and when the image attribute signal indicates expansion of the luminance range, the second color converted While the image data digital signal is selected, when the image attribute signal does not instruct the expansion of the luminance range, the first color-converted image data digital signal is selected. The data selecting means for outputting, the D / A conversion is performed on the first color-converted image data digital signal or the second color-converted image data digital signal output from the data selecting means, and the conversion result is described above. 15. The image data conversion device according to claim 14, further comprising a D / A conversion means for outputting as a display data analog signal. 17. A first D / A conversion means for performing D / A conversion on the inputted image data digital signal and outputting the conversion result as a first image data analog signal, A second D / A converter which performs D / A conversion on the image data digital signal having a maximum output signal level higher than that of the first D / A conversion means and outputs the conversion result as a second image data analog signal. The A conversion means, the first image data analog signal, the second image data analog signal, and the image attribute signal are input, and when the image attribute signal instructs to expand the brightness range, the second While the image data analog signal is selected, the first image data analog signal is selected when the image attribute signal does not instruct to expand the brightness range, and the selected signal is displayed in the table. Claim, characterized in that a data selection means for outputting the data analog signal 1
4. The image data conversion device described in 4. 18. D / A conversion means for performing D / A conversion on the input image data digital signal and outputting the conversion result as an image data analog signal; the image data analog signal and the image attribute signal. And the input image data analog signal are amplified by a relatively high amplification factor when the image attribute signal indicates expansion of the luminance range, while the image attribute signal indicates expansion of the luminance range. The image data conversion apparatus according to claim 14, further comprising: an amplification unit that amplifies at a relatively low amplification rate when not performing the amplification and outputs the amplification result as the display data analog signal. 19. An image data digital signal output from a video memory storing a plurality of image data in each of a plurality of storage areas, and information indicating whether or not the luminance range needs to be expanded, and the luminance. The range expansion rate is also output from the attribute storage unit that stores the image attributes for each of the storage areas. When the image attributes indicate that the brightness range needs to be expanded, the expansion of the brightness range is instructed. At the same time, the magnification ratio of the brightness range is also instructed. On the other hand, when the image attribute indicates that it is not necessary to expand the brightness range, an image attribute signal that does not instruct the expansion of the brightness range is input, and the image is displayed on the display device. An image data conversion device for generating a display data analog signal for outputting the same to the display device, wherein an input image attribute signal indicates expansion of a luminance range. If it is only the image data converting apparatus characterized by increasing the luminance value of the display data analog signals in accordance with an instruction of the image attribute signal. 20. A plurality of brightness conversion means for converting the input image data digital signal to expand a brightness range and outputting the conversion result as a brightness-converted image data digital signal; And a plurality of the brightness-converted image data digital signals and the image attribute signal are input, and one digital signal is selected from the image data digital signal and the plurality of brightness-converted image data digital signals according to an instruction of the image attribute signal. A data selecting means for selecting a signal, and a D / A converting means for D / A converting the digital signal selected by the data selecting means and outputting the conversion result as the display data analog signal. 20. The image data conversion device according to claim 19, wherein 21. A plurality of D / A conversion means for performing D / A conversion with different maximum output signal levels on the input image data digital signals and outputting the conversion results as image data analog signals, respectively. The image data analog signal and the image attribute signal are input, one analog signal is selected from a plurality of the image data analog signals according to an instruction of the image attribute signal, and the selected analog signal is the display data analog. 20. The image data conversion apparatus according to claim 19, further comprising a data selection unit that outputs as a signal. 22. A pre-brightness-adjustment image data digital signal output from a main memory that stores a plurality of image data in each of a plurality of storage areas, and information indicating whether or not the brightness range needs to be expanded. When the image attribute output from the attribute storage unit that stores the image attribute for each storage area indicates that the luminance range needs to be expanded, the expansion of the luminance range is instructed while the image attribute is expanded. Indicates that it is not necessary to expand the brightness range, an image attribute signal that does not instruct expansion of the brightness range is input, and an image data conversion device that creates a brightness-adjusted image data digital signal and outputs it to the video memory. Therefore, the brightness value of the brightness-adjusted image data digital signal is increased only when the input image attribute signal indicates expansion of the brightness range. Image data conversion apparatus characterized by. 23. Brightness conversion means for performing a conversion for expanding a brightness range on the input pre-luminance adjustment image data signal and outputting the conversion result as a post-luminance conversion image data digital signal; A data digital signal, the luminance-converted image data digital signal and the image attribute signal are input, and when the image attribute signal indicates expansion of the luminance range, the luminance-converted image data digital signal is selected, When the image attribute signal does not instruct expansion of the brightness range, the pre-brightness adjustment image data digital signal is selected, and the selected signal is output as the post-brightness adjustment image data digital signal. 23. The image data conversion device according to claim 22, wherein 24. Color conversion is performed on the input image data digital signal before brightness adjustment, and the conversion result is first converted.
The first color conversion means for outputting as the color-converted image data digital signal, and the input pre-adjustment image data digital signal are subjected to color conversion and conversion for expanding the brightness range. To output as a second color-converted image data digital signal, the first color-converted image data digital signal, the second color-converted image data digital signal, and the image attribute signal. Is input and the image attribute signal indicates expansion of the luminance range, the second digital image data after color conversion is selected, while the image attribute signal does not indicate expansion of the luminance range. Is data for selecting the first color-converted image data digital signal and outputting the selected signal as the brightness-adjusted image data digital signal. Image data conversion apparatus according to claim 22, characterized in that it comprises a-option means. 25. A pre-brightness-adjustment image data digital signal output from a main memory that stores a plurality of image data in each of a plurality of storage areas, and information indicating whether or not the brightness range needs to be expanded. In addition, the expansion ratio of the brightness range is also output from the attribute storage unit that stores the image area for each storage area. When the image attribute indicates that the brightness range needs to be expanded, the expansion of the brightness range is performed. In addition to indicating the brightness range expansion rate, when the image attribute indicates that the brightness range need not be expanded, an image attribute signal that does not instruct the expansion of the brightness range is input, and after the brightness adjustment. An image data conversion device that creates a digital signal of image data and outputs it to a video memory, and when the input image attribute signal instructs to expand the luminance range. Only, the image data converting apparatus characterized by increasing the luminance value of the luminance adjusted image data digital signals in accordance with an instruction of the image attribute signal. 26. A plurality of brightness conversion means for performing conversion for expanding a brightness range on an input pre-adjustment image data digital signal and outputting the conversion result as a post-luminance conversion image data digital signal, respectively. The pre-adjustment image data digital signal, the plurality of the brightness-converted image data digital signals and the image attribute signal are input, and the brightness-unadjusted image data digital signal and the plurality of brightness-converted images are input in accordance with an instruction of the image attribute signal. 3. A data selecting means for selecting one digital signal from the data digital signals and outputting the selected digital signal as the brightness-adjusted image data digital signal.
5. The image data conversion device described in 5.