JPH06348447A - Picture processor - Google Patents

Abstract

PURPOSE:To provide a picture processing system capable of converting picture data including plural window areas having respectively different display modes to be used into a pixel value having an optional display mode, reducing the load of picture data processing especially in AP and obtaining picture data similar to a displayed picture. CONSTITUTION:This picture processor provided with a multiwindow display function capable of changing the contents of video lookup tables (LUTs) for converting the number of valid bits of one picture element in a frame memory 16 for storing picture data consisting of plural bits in each picture element and the picture element value of each picture element into RGB values in each window is also provided with a picture element value converting means 121 for converting a picture element value in an window to which the 1st display mode using the 1st valid bit number and the 1st LUT 15 is applied into a picture element value capable of showing the same or similar color as a color expressed by the former picture element value in the 2nd display mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus having a multi-window function, and more particularly to an information processing apparatus capable of using different frame memory pixel bit numbers and different video lookup tables for each window.

[0002]

2. Description of the Related Art Displaying on a display is one form of outputting graphics and images. In a raster scan type display device used as a display device, generally, when outputting graphics to a display, the drawing system has a video lookup table (hereinafter abbreviated as LUT). The LUT converts the color expression (pixel value, that is, pixel value) corresponding to the image created by the image generation processing and stored in the frame memory into the control signal of the red, green, and blue CRT beams according to the contents of the table. And display it. That is, the pixel value at any position on the frame memory is used as an index for accessing the LUT, instead of being directly sent to the digital-analog converter. For example, if the pixel value is 120, then the content at location 120 of the LUT is accessed and that content is used to control the signal of the CRT beam.

Further, in the raster scan type display device, the number of colors that can be simultaneously displayed is determined by the number of bits of one pixel forming the frame memory. For example, when a frame memory of 24 bits per pixel is used, approximately 16 million colors can be displayed simultaneously. When a frame memory of 8 bits per pixel and an LUT in which one entry is 24 bits are used, 256 colors out of about 16 million colors can be displayed simultaneously.

With the recent decrease in the price of semiconductor memories,
The number of personal computers and workstations with a 24-bit / 1-pixel frame memory is increasing. Furthermore, in a system using a multi-window system, an application program (hereinafter referred to as A
Since the required display color often differs depending on P, the LUT to be used and the number of bits of one pixel (hereinafter, these display states are displayed even in a display device having a frame memory of 24 bits / 1 pixel). Mode) is switchable in window units, and different display modes can be displayed simultaneously in window units.

The basic structure of the above display device is as follows.
"Computer Graphics," J. D. FOLE
Y / A. VAN DAN, translated by Atsumi Imamiya, published by Japan Computer Association, P135-P141.

Similarly, in an output device other than the display, the LUT is used to expand the data into RGB and output it. At present, in the data of the frame memory of 8 bits or 24 bits / 1 pixel, the output to the printer of the screen using one LUT is already provided as a product. Regarding image data processing for a printer, a technique relating to the case where an image is composed of a plurality of planes has been proposed in Japanese Patent Laid-Open No. 4-281666 "Image Processing Device".

[0007]

Image data is usually
It is represented by the pixel value of the LUT corresponding to the display mode used. Therefore, when different display modes can be specified for each window, pixel data for a plurality of LUTs are mixed in the image data for image data in which a plurality of window areas having different display modes are mixed. Will be done. That is, even with the same pixel value, different LUTs used result in different colors.

The number of bits of one pixel and its configuration are LU
Although the method of accessing T is specified, there are multiple methods of accessing this. Even for the same pixel value using the LUT having the same number of colors, the pointed color is different if the access method is different. RG is a typical access method
There are a direct method in which each value of B is specified by a separate index value, and an index method in which an entry of a table in which RGB values are set is specified by one index value.

The effective number of bits of one pixel of the frame memory,
Correspondence between these two methods (direct method and index method) is shown in FIG.

FIG. 2 (1) uses the direct method for a frame memory of 1 pixel 8 bits. This is because 8 bits of the frame memory 21 are divided into 3, 3 and 2 bits for indexing to RGB and used as 3 index values, and R is set according to each index value.
This is a method of referring to the LUT 211 (R: 8 entries, G: 8 entries, B: 4 entries) for each GB and obtaining RGB values (8 bits each, 24 bits in total) 212. As a result, 256 colors out of full color (about 16 million colors)
It can be used as a registered color for UT.

FIG. 2 (2) uses an index method for a frame memory of 1 pixel 8 bits. With 8 bits of the frame memory 22 as one index value, the LUT 221 (256 entries) is referred to, and RGB is used.
A value (8 bits each, 24 bits in total) 222 is obtained. By this method, 256 colors out of about 16 million colors are LU
It can be used as a registered color of T. However, which color is 2
Whether to select 56 colors depends on the creator.

FIG. 2 (3) uses a direct method for a frame memory of 24 bits per pixel, and the 24 bits of the frame memory 23 are each divided into 8 bits to obtain three index values (8 bits each). RGB Refer to LUT 231 (256 entries) separately for RGB
This is a method of obtaining the value 232 (24 bits). As a result, all about 16 million colors can be used as the registered color of the LUT.

FIG. 2 (4) uses an index method for a frame memory of 24 bits per pixel, and refers to LUT 241 (about 16 million entries) with 24 bits of the frame memory 24 as one index value.
The RGB value 242 (24 bits) is calculated. Also in this method, all about 16 million colors can be used as the registered colors of the LUT.

For example, as a display mode, window 1 uses a direct method using a frame memory of 1 pixel 8 bits, window 2 uses an index method using a frame memory of 1 pixel 8 bits, and window 3 uses an index method using a frame memory of 1 pixel 24 bits. Let's take the method. Assuming that the same pixel value “0xcc0000” (0x at the beginning represents a hexadecimal number) is the same as the image data of these three windows, the window 1 in FIG.
Taking the correspondence shown in (1), (R, G, B) = (0xd
f, 0x7f, 0x3f) and the color is orange. In the window 2, the correspondence shown in FIG. 2B is taken, and if the registered value of the entry of the LUT has, for example, the same value (0xcc) as the index value for each RGB,
(R, G, B) = (0xcc, 0xcc, 0xcc), and the color is a gray-based color. In window 3
Taking the correspondence shown in (4), in the illustrated example, (R, G,
B) = (0xcc, 0x00, 0x00) and the color is red.

If the system physically has more than one LUT, it is possible to apply multiple display modes to multiple windows simultaneously, but again,
The image data including two or more windows using these LUTs is itself composed of simple pixel values that do not correspond to the display modes, and therefore different colors correspond to the same pixel values. This means that some pixels are mixed. However, the difference cannot be identified from the conventional image data. A method of adding display mode information to the image data with the image processing AP is also conceivable, but if a private LUT having the contents set by an arbitrary AP is used, the LUT that has not been installed is referred from another AP. It cannot be processed and cannot be processed. Display mode information can be added on a system program that can refer to all LUTs, but with this method, the image data format provided to the AP is different from the conventional format.

It is an object of the present invention to provide image data including a plurality of window areas having different display modes in a system in which a plurality of display modes defined by the number of bits of one pixel of a frame memory and a look-up table exist at the same time. An object of the present invention is to provide an image processing device capable of obtaining image data converted into pixel values in any one display mode.

[0017]

In order to achieve the above object, an image processing apparatus according to the present invention has an effective bit number of one pixel of a frame memory for storing image data of a plurality of bits in each pixel unit and each pixel. In an image processing apparatus having a multi-window display function capable of changing the contents of a video lookup table (LUT) for converting pixel values into RGB values for each window, a first effective bit number and a first effective bit number are provided. Pixel value conversion means for converting a pixel value in a window to which the first display mode using the LUT is applied into a pixel value which gives the same or an approximate color as the color represented by the pixel value in the second display mode. Be prepared.

[0018]

In response to an image data acquisition request for an arbitrary image area, information about the window display mode in the specified image acquisition area and the area information thereof are obtained. Next, which display mode the pixel value is converted to, that is, the conversion destination display mode is automatically determined based on the user's instruction or according to the state of the window. For example, the display mode of a window with a high priority is detected according to the priority relationship between the windows. Pixel values in display modes other than the detected display mode (conversion destination display mode) are converted into corresponding pixel values in the conversion destination display mode. The converted image data is sent to a printer process, an AP, or managed using a storage unit.

According to the present invention, it is possible to obtain the image data of the unified display mode for the image data of a plurality of windows having different display modes.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows the structure of an image processing-related part of an information processing apparatus to which the present invention is applied. With this configuration, an image processing unit 11 that performs image processing in response to a request from a central processing unit (CPU), an image conversion unit 12 that converts image data according to a display mode, and an output of the image conversion unit 12 The printer control unit 13 that receives the received image data and controls the printer 14, the frame memory 16 in which the image data is written by the image processing unit 11, the plurality of LUTs 15 and 151, and these L
The display controller 17 displays the image data of the frame memory 16 on the display 18 with reference to the UT. The application (AP) 19 can receive the output of the image conversion unit 12.

When the image processing unit 11 receives a request for image processing and the content of the request is output to the printer 14, such as a hard copy, the conversion processing unit 121 of the image conversion unit 12 converts the image data. , A single type of LUT (eg LU
The image data 122 of the display mode using T15) is generated, and the image data is output to the printer 14 via the printer control unit 13. If the content of the request is image data acquisition from the AP, the image conversion unit 121 similarly converts the image data to generate the image data 122 in the display mode using a single type of LUT, and the image data is converted to the AP 19
Return to.

If the content of the request is output to the display, the image data is written in the frame memory 16 and is displayed on the display 18 by referring to the LUTs 15 and 151 via the display controller 17, as in the conventional case.

In the present embodiment, one pixel of the frame memory 16 is of two types of 8 bits / 24 bits, and the access method is of two types: direct and index. Also,
The area for storing the information of the frame memory secures an area for 24 bits so that both 8/24 bits can be managed, and 8-bit data has a value in the upper 8 bits of the 24 bits.

The specific operation of the LUT when different colors are set for pixel values will be described with reference to FIG.

As shown in FIG. 21 (1), there are three LUs.
An example of T registration is shown. LUT1, LUT2, and LUT3 set colors independently for pixels 1, 2, 3, 4 ,. Therefore, different LUTs may represent different colors for the same pixel value. Note that the LUT in FIG. 1A is a logical LUT and a physical L
It works by registering with the UT. Hereinafter, when simply referred to as an LUT, it means a logical LUT. LUT1 to LUTn shown in FIG. 1 are logical LUTs.
Or a physical LUT.

FIG. 2B shows such a logical LUT.
The case where there is one physical LUT capable of registering is shown. The number of physical LUTs determines the number of logical LUTs that can be used simultaneously in the system. Now, when the pixel values 1, 2, 3, and 4 are represented by red, black, green, and white by LUT1, and the LUT is changed to LUT2,
These colors change to blue, purple, white and brown respectively. Therefore, when different LUTs are specified by windows, the display is performed according to the display mode (LUT) of the window (active window) stacked on the top, so that the display colors in the windows of other display modes are displayed. Will be displayed in a color different from the actually specified color.

FIG. 21 (3) shows a case where two physical LUTs can be used, and LUT1 and LUT3 are used at the same time. Similar to the case of FIG. 21 (2), the pixel value is changed by changing the LUT. You can see that the corresponding colors change.

FIG. 6 shows an example of image data before and after the conversion process using the present invention is executed. Each pixel value is represented by a 6-digit hexadecimal number (24 bits).
Now, let us consider an example in which the image data of the upper left hatched area of the frame memory 16 is extracted. The image data 651 of the window 61 of the image data 65 before the conversion processing of the conversion target area is the pixel value of the LUT 64 obtained by using the direct mode display mode 1 of 1 pixel 8 bits, and the image of the window 62 The data 652 has one pixel 24
LUT using bit direct display mode 2
Let it be a pixel value of 63. Under this condition,
In the conversion process from one display mode to the other display mode, the RGB value corresponding to the pixel value 0xcc0000 of the image data of the window 61 is (df, 7f, 3f) according to each LUT, and the orange color, window Assuming that the RGB value corresponding to the pixel value 0xcc0000 of the image data 62 is (cc, 00,00) and the color is red, the same color needs to be expressed in principle even in the unified display mode. The image data 66 after the image conversion processing of the present invention is image data obtained by converting the pixel values of the LUT 63 into the pixel values of the LUT 64.
In this example, the pixel value of the window 61 is 0x
By changing cc0000 to 0xc00000, the same color as the color obtained by LUT63 is changed to LU.
The state obtained by T64 is shown.

FIG. 7 is a flow chart showing the flow of image processing including conversion to which the present invention is applied. First, information on which window area is to be imaged is obtained from the AP or the input processing (71), and an area list of the image of that window (consisting of coordinate data of a rectangular area) and information on the display mode are obtained ( 72), managing the area list for each display mode. The image data at this time is obtained without overlapping information even if a plurality of planes are used. Next, the display mode to be converted (conversion destination display mode) is detected (73). Next, for each display mode other than the detected display mode (74), it is determined whether or not a conversion table (details described later) used for converting the pixel value from the display mode to the conversion destination display mode already exists. It is checked (75), and if it does not exist, the conversion table is created (77). Then, data conversion is performed based on the conversion table (78). In this data conversion, only the pixel value that is the conversion target needs to be converted. The correspondence relationship of the pixel values between the two display modes obtained by this conversion is stored in the correspondence table (79), and when the same conversion process occurs thereafter, the quick conversion of data is performed by referring to this correspondence table. Can be done. In the figure, process 7
8 and the process 79 are shown in time series, the process 78 can be executed in parallel with the process 79. In the process 78, if the conversion is not performed only for the pixel value that is the conversion target, but the conversion is performed for all the pixel values, it takes a lot of processing time, but there is an advantage that one correspondence table is completed. is there. The data obtained by the data conversion is collectively managed as pixel value data corresponding to one display mode, and stored in a file or a specific memory as necessary (710).

FIG. 10 shows a specific example of the conversion table described in the process 77 of FIG. This conversion table 240 is
It is prepared for each of two different LUTs m and n. Each conversion table 240 is designated by a pointer 249. Each conversion table 240 has a pointer 241 to the LUTm, the number of effective bits 2 of the frame memory in this display mode.
42, LUT access method 24 in this display mode
3, pointer 244 to LUTn, effective bit number 245 of frame memory in this display mode, LUT access method 246 in this display mode, and RGB of both LUTs in both display modes for each pixel value.
It consists of the value 247. Note that the number of pixel values in both display modes may differ depending on the number of effective bits (for example, 256 in the case of 8 bits and approximately 16 million in the case of 24 bits). Therefore, when the number of effective bits in one display mode is 8 bits and the other is 24 bits, a number that means that the RGB value after the pixel value “256” of 8 bits is invalid, for example, “−1” is set. Store it.

FIG. 17 shows an example of the pixel value correspondence table between the display modes described in the processing 79 of FIG. In the correspondence table 170 of this example, for convenience, the number of pixel values in the display mode 1 is set to 16, and these pixel values correspond to each other.
Pixel values in display mode 2 are associated with each other. The numbers in the figure indicate decimal numbers. According to this correspondence table 170,
For example, it is immediately apparent that the pixel value "8" in display mode 1 corresponds to the pixel value "12" in display mode 2.

Next, a concrete data conversion method of the process 78 of FIG. 7 will be described with reference to FIG. The display mode using a pixel value of 24 bits per pixel is the full color display mode. Usually, an arbitrary color (RGB value) is always found among the colors represented by in the full color display mode. Therefore, when the conversion destination display mode is the full color display mode, the corresponding color (RGB
Value) and find the pixel value corresponding to that color as the target pixel value. On the other hand, when the display mode of the conversion destination is the non-full color display mode (for example, 1 pixel 8 bits, 4 bits, etc.), the corresponding color does not always exist. In that case, a pixel value that gives an approximate color is obtained.

In FIG. 18, data conversion from the display mode using LUT1 to the display mode using LUT2 will now be considered. First, the ratio of RGB values corresponding to each pixel value of LUT1 and LUT2 is obtained (181). Both LUTs
Each pixel value of can be calculated from the conversion table 240 of FIG. The RGB values of LUT1 and LUT2 and their ratios are as shown in FIG. 11, for example. Here, the ratio of the numerical values obtained by adding “1” to each value of RGB is taken. Although the first decimal place is used, it may be an integer. The value of this ratio, together with the conversion table 240,
Or store it separately. Then, the RGB value of LUT1 and the ratio thereof to the pixel value to be converted are obtained (18
2). This process is repeated until there are no more pixel values to be converted (183). The pattern of the R: G: B ratio of the RGB values corresponding to the pixel value obtained in step 182 is identified (184). This pattern will be described later. The RGB value of the same pattern as this ratio is the LUT
It is checked whether it exists in 2 (185). If not, L
The pattern of UT1 is transformed (186), and the comparison is performed again (185). The modification of the ratio will also be described later. If there are patterns with the same pattern, comparison processing such as ratio comparison and ratio difference comparison is performed (187). As a result of this comparison process, if there is an approximate value of RGB values (including perfect identity),
The pixel value of LUT2 is stored in the correspondence table of LUT1 and LUT2, the process returns to step 182, and the above process is performed for the next pixel value. If there is no approximate value, the pattern is transformed (189) and the process returns to step 185.

In the comparison processing of step 187, first, R
Look for those with the same ratio of GB values. RGB with the same ratio
The values are considered to represent the same type of color, even though they have different intensities. As shown in FIG. 12, when a plurality of RGB values having the same ratio as the RGB value ratio of LUT1 (3.3: 5.0: 1.0 in the illustrated example) exist in LUT2, LUT1
The RGB value 1 having the value 123 closest to the value 122 of the primary color (G in this case) having the largest ratio of the RGB value 121 of
24 are selected. Note that, as shown in FIG. 13, even if there are those having the same ratio, if the difference between the primary colors having the maximum ratio value is a predetermined value 133 or more, it is considered that the color difference is large, and this same It is also possible to exclude those having a similar ratio and select one having a similar value for the primary color having the maximum ratio among the similar ratios.

When the pixel value of the RGB value approximated by the method of FIGS. 12 and 13 cannot be obtained, as shown in FIG.
Among the RGB values of a plurality of similar ratios (the pattern 141 is the same) of the LUT 2, the difference in the ratio of the RGB values (RG, GB,
B-R) choose ones that approximate those of the RGB values of LUT1. In the example of the figure, RGB of pixel value x of LUT1
The difference between the pixel value and the pixel value y, z of the LUT2 is compared, and the pixel value z is approximated.

FIG. 15 shows a pattern of RGB value ratios. When the RGB value of the LUT in the conversion destination display mode does not have the RGB value of the desired pattern, a predetermined transformation is applied to the RGB value pattern of the LUT in the conversion source display mode in order to find a suboptimal approximate RGB value. . At this time, since the primary color having the maximum ratio of RGB values is the emphasized color, the values of the other primary colors are changed. An example thereof is shown as a modification pattern 151. Furthermore, even if the approximate RGB values are not specified, the pattern may be modified to allow a plurality of primary colors having the maximum value to exist. This modified pattern is particularly shown as an extended pattern 152.

FIG. 16 shows how each pixel value of LUT1 is finally associated with the pixel value of LUT2. The result is the above-mentioned correspondence table (FIG. 17).

FIG. 3 is a diagram showing the priority relationship between windows when determining which display mode the image data relating to a plurality of display modes is to be converted, as described in the process 73 of FIG. is there.

As shown in FIG. 3A, when another window 32 is opened inside a certain window 31, both windows 31 and 32 have a parent-child relationship. Among the windows having such a parent-child relationship, the child window 32 inherits the display mode of the parent window 31 by default. Therefore, the parent window 31 uses the LUT 311, and the child window 32 uses L.
When the UT 321 is used, the image data is unified and converted into the display mode (LUT 311) of the parent window (window 31 in this example).

As shown in FIG. 3 (b), the windows 33 and 34 in a sibling relationship use the display mode of the window (window 33 in this case) stacked on top. This is because it is highly likely that the image is at the highest level and that the display control is performed using that display mode.

As shown in FIG. 3 (c), when siblings and parent-child windows are mixed, the parent window 35 and the sibling window 36 are first set.
, And the window (window 35 in this example) stacked at the top of these windows is obtained and the display mode is unified. In this case, the windows 35, 311 and 36 have different LUTs 3, respectively.
11, 321, 332 are used.

As shown in FIG. 3D, regarding the image of the window 37 hidden by the sibling windows 39 and 310, the window groups 37 and 38 in which all the areas are included in the area to be imaged are obtained, and The display mode of the window having the highest priority (window 37 in this example) is unified and converted according to the relationship between the sibling / parent-child windows. In this case, the windows 37 and 310 are L
The UT 311 is commonly used, and the window 38 is the LUT 32.
1 and the window 39 uses the LUT 391.

FIG. 8 is a flow chart of a process for detecting the conversion destination display mode described in the process 73 of FIG. 7, that is, which display mode the pixel value of a certain display mode is converted to. Here, the specifications are such that conversion is performed only according to the priority relationship between the windows to be imaged, regardless of the LUT used on the display screen. Other specifications are possible, as described below.

In FIG. 8, first, a window existing in the area to be imaged, and in which all the areas of the window are included in the imaged area is obtained (81). Next, the window stacked at the top of the windows is obtained (82). It is checked whether there is any window in the imaged area that is the ancestor of the obtained window (83). If not, the display mode of the obtained window is defined as the conversion destination display mode (84). If there is something in the imaged area, it is defined as a display mode for converting the display mode of the window of its ancestor (85).

The conversion destination display mode thus determined is stored as management information as shown in FIG. That is, the management information 230 includes a pointer 321 to the LUT used in the conversion destination display mode, an effective bit number (depth) 232 of the frame memory, and an access method 233 of the LUT.

In addition to this, there may be a method of detecting the conversion destination display mode by providing a means that can be instructed from the AP and not in accordance with the priority of the relation between windows and in accordance with the instruction. For example, a display mode that can be processed by the AP or a LUT configured with colors supported by the printer when output to the printer is generated, a display mode using the LUT can be designated, and conversion can be performed according to the value.

Another example of the method of detecting the conversion destination display mode will be described with reference to FIG. First, the input content from the user is analyzed (191), and if it is an image data output request, the conversion destination display mode information is obtained from it (192). If there is a display mode designation, the designated display mode is set as the conversion destination display mode (194). If the display mode is not specified, it is checked whether the window identifier is specified (196). If there is, the display mode of the designated window is set as the conversion destination display mode (197). If not, a window that is wholly included in the designated image area is detected (198). The number of detected windows is checked (199), and if it is 1, the display mode of the window is set as the conversion destination display mode (191).
2). If it is 0, a window including all designated areas is detected (1910), and the display mode of this window is set as the conversion destination display mode (1911). Process 19
If the number of windows is two or more in 8, the display mode of the window with the higher priority is set as the conversion destination display mode (1913). As the priority, in addition to those described with reference to FIGS. 3 and 8, any existing priority can be adopted.

The range of the image data to be acquired can be designated on the CRT screen 201, for example, by using a pointing device or the like on the diagonal coordinates of the acquisition range 208, as shown by the diagonal lines in FIG. The target image management information 220 as shown in FIG. 4 is stored for the acquisition range 208 thus obtained. This information includes, for each different display mode, a pointer 221 to the LUT to be used, a region list 222 of the image displayed by this LUT, and the effective bit number (depth) 22 of the frame memory of this region.
3, the access method 224 of this LUT. This information 220 can be accessed by the image acquisition information pointer 225.

As described above, according to the present invention, image data that can be processed in any one display mode can be generated. Therefore, for example, in a process of generating data for hard copy, an image of another window is displayed in an arbitrary window. It can be applied to the process of capturing data. Further, when an image data acquisition request is issued from the AP, it can be returned to the AP with a color value similar to the color set by the creator without changing the conventional image data format.

When there are a plurality of LUTs physically installed as described with reference to FIG. 21C, the image data 91 is generated when the display screen is generated as shown in the example of FIG.
Are processing according to their respective display modes using either LUT 92 or 93. That is, the image data 91 includes a group 94 that uses the LUT 92 and an LU.
It is divided into a group 95 using T93. In this embodiment, for example, the image data of the group 95 is converted into the pixel value data of the arbitrary display mode of the LUT 92 of the group 94, and all the image data are processed in one display mode of the group 94. You can also

[0052]

According to the present invention, it is possible to generate image data which can be processed in any one display mode, even if there are many display modes and windows having different display modes are mixed. . For example, if it is applied to a process of generating data for hard copy or a process of capturing image data of another window into an arbitrary window, a color value similar to the color set by the creator is used as the image data of one type of display mode. Obtainable. Further, since the conventional image data format is not changed, this image data can be used for image processing similar to the conventional one.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an image processing-related portion of an information processing apparatus to which the present invention has been applied.

FIG. 2 is an explanatory diagram of an RGB value acquisition method for each display mode.

FIG. 3 is an explanatory diagram of the priority of display mode conversion according to the relationship between windows in the embodiment.

FIG. 4 is an explanatory diagram of target image information used in the embodiment.

FIG. 5 is an explanatory diagram of display mode management information used in the embodiment.

FIG. 6 is an explanatory diagram of a change example of image data.

FIG. 7 is a flowchart of image processing according to the embodiment.

FIG. 8 is a flowchart of processing of a conversion destination display mode detection step of FIG.

FIG. 9 is an explanatory diagram of a display mode conversion example when there are two physical LUTs.

FIG. 10 is an explanatory diagram of an example of a conversion table used in the embodiment.

FIG. 11 is an explanatory diagram of a ratio of RGB values in the example.

FIG. 12 is an explanatory diagram of a data conversion method according to the embodiment.

FIG. 13 is an explanatory diagram of a data conversion method according to the embodiment.

FIG. 14 is an explanatory diagram of a data conversion method according to the embodiment.

FIG. 15 is an explanatory diagram of a pattern of a ratio of RGB values in the example.

FIG. 16 is an explanatory diagram of associating pixel values of two LUTs in the example.

FIG. 17 is an explanatory diagram of a correspondence table of pixel values between display modes according to the embodiment.

FIG. 18 is a flowchart of a process of an example of the data conversion step of FIG. 7.

FIG. 19 is a flowchart of another process of detecting the conversion destination display mode.

FIG. 20 is an explanatory diagram of an example of specifying a range of image data to be acquired in the embodiment.

FIG. 21 is an explanatory diagram of an example of LUT switching in display.

[Explanation of symbols]

11 ... System, 12 ... Image conversion unit, 121 ... Conversion processing unit, 122 ... Image data after conversion, 13 ... Printer control unit, 14 ... Printer, 15 ... Video lookup table provided for image display , 16 ... Frame memory, 17 ... Display control unit, 18 ... Display, 19 ...
APs 21 to 24 ... Frame memories used by each window, 211, 221, 231, 241 ... Video lookup tables 31 to 3 used by each window
7 ... Window

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Shinji Kimura Inventor Shinji Kimura 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Hitachi, Ltd. System Development Laboratory (72) Inventor Shoji Nakamura 1099 Ozenji, Aso-ku, Kawasaki-shi, Kanagawa Hitachi, Ltd. Manufacturing Systems Development Laboratory (72) Inventor Eriko Koda 1099 Ozenji, Aso-ku, Kawasaki, Kanagawa Stock Company Hitachi Systems Development Laboratory (72) Masanori Honda 1099 Ozenji, Aso-ku, Kawasaki, Kanagawa Hitachi Ltd. (72) Inventor Hideto Iio 52-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Process Computer Engineering Co., Ltd.

Claims (9)

[Claims] 1. The number of effective bits of one pixel of a frame memory for storing image data of a plurality of bits for each pixel and the contents of a video lookup table (LUT) for converting the pixel value of each pixel into an RGB value are displayed in a window. In an image processing apparatus having a multi-window display function that can be changed for each pixel, a pixel value in a window to which the first display mode using the first effective bit number and the first LUT is applied is The second color is the same as or close to the color represented by the pixel value.
An image processing apparatus comprising: a pixel value conversion means for converting a pixel value given in the display mode. 2. The image processing apparatus according to claim 1, wherein the first and second display modes differ in at least the number of effective bits of one pixel of the frame memory or the content of the LUT. 3. The image processing apparatus according to claim 1, further comprising an image area designating means for designating an image area on which a pixel value is converted by the pixel value converting means on a display screen. 4. The image processing apparatus according to claim 1, further comprising conversion destination display mode setting means for setting the second display mode based on input information. 5. The image processing apparatus according to claim 4, wherein the input information is information that directly specifies a display mode. 6. The input information is window designation information, and the conversion destination display mode setting means determines the second display mode based on the window designation information. The image processing device described. 7. The image processing apparatus according to claim 4, wherein the conversion destination display mode setting means has means for providing a priority relationship between the windows, and automatically sets in accordance with the priority relationship. 8. The pixel value conversion means is an RGB value R corresponding to a pixel value to be converted in the first display mode:
By comparing the G: B ratio with the RGB values R: G: B ratio corresponding to any pixel value of the second display mode,
The image processing apparatus according to claim 1, wherein pixel values of the same or similar colors are obtained. 9. The pixel value converting means holds a correspondence relationship of pixel values between the first and second display modes, which has been obtained once, as a correspondence table, and the corresponding conversion is performed next time when the same conversion is performed. 9. The image processing apparatus according to claim 1, wherein the pixel value conversion is performed by referring to the table.