JPS595280A - Display system for color image display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a color image display device, and relates to a color image display device that displays a plurality of images in color by controlling and modulating the hue, saturation, and brightness of a plurality of images. The present invention relates to a display method of a display device.

[Conventional technology and problems]

Figure $1 is a diagram showing a display method of a conventional color image display device. In Fig. 1, 1 to 3 are images;
4 indicates a color image display.

In conventional color image display devices, given 3
The images 1 to 3 are assigned to red (R), green (G), and blue (B), respectively, and are displayed in color on the color image display 4. However, in this display method, for example, when creating a color image on a computer (in the field of computer animation, etc.), how much R, G, and B should be mixed to achieve visual results (i.e., hue H, saturation S, brightness)? I)
It is not clear what color it will be displayed in.

The composite color display of three types of image data A or 3 obtained by tit remote sensing, etc. is performed by assigning the shading of each image to R, G%B, and displaying it on the color image display 4 (false... Color Display Method) 0 As a method for displaying such a color display image in combination with another gradation image, a method of modulating and displaying either R or G%B color with a gradation image can be considered.

However, with this method, the hue, saturation, and brightness of the original color display image also change, making it impossible to clearly identify the combined grayscale image.

[Purpose of the invention]

The present invention solves the above problems.

Data for color display in a color image display device can be given as hue H, saturation S, and brightness I. For example, by changing only the brightness I with a grayscale image and displaying a composite color image, the color display image can also be displayed. It is an object of the present invention to provide a display method for a color image display device that can distinguish even grayscale images.

[Structure of the invention]

For this purpose, the display method of the color image display device of the present invention is a color image display device that displays a color image by mixing three pixels of red, green, and evening, and an eight-image display device that provides an image to the red pixel of the color image display device. , a 0 image that provides an image to the green pixel of the color image display device, an 8 image that provides an image to the blue pixel of the color image display device, a 1st image that provides the image to the color image display device for color display. Image and second
The relationship between the three attributes of the hue, saturation, and lightness of the color produced by mixing the three primary colors is made to correspond to the image, the third image, and the density of the three primary colors of red, green, and blue, and the mutual relationship is calculated. The image converting means converts the first image, the second image, and the third image into the three primary colors and the three attributes. The present invention is characterized in that the color image display device displays the 8th image, the 0th image, and the 8th image.

[Embodiments of the Invention] An embodiment of the present invention will be described below with reference to the drawings. Figure 2 is a diagram showing one embodiment of the present invention, Figure 3 is a diagram showing the RGB coordinate system, Figure 4 is a diagram showing the definition of brightness, Figure 5 is a diagram showing the definition of hue, and Figure 6 is a diagram showing the definition of hue. Figure 7 shows the definition of saturation.
The figures show the RGB-H8I display synthesis method according to the present invention, FIG. 8 shows the H8IfRGB display synthesis method, and FIG. 9 shows the H8IfRGB display synthesis method.
The figure shows one embodiment of the H8I modulation display synthesis method. S image, 9 is the surface image, 10 is RGB
Conversion unit, 11 is 8 images, 12 is 0 images, 13 is 8 images,
14 to 16 are adders, 17 is H' image, 18 is 87
19 indicates 17 images, and 20 indicates modulation graphic data.

As shown in FIG. 2, the present invention converts three images 1 to 3 in an H8I conversion & RGB conversion section 5 based on the H8I conversion method or RGB conversion method described later, and displays the composite image on a color image display. By displaying the image displayed on the color image display, the hue H
1, saturation S1 and brightness I can be easily modulated and synthesized. That is, H8I conversion & RGB conversion section 5
Here, 8 images (red) showing the density of each of the three primary colors of light, 0
image (green), RGB image consisting of 8 images ('#), H image (hue) and S image (
When converting between H8I images consisting of chroma (saturation) and surface images (brightness), or compositing multiple pieces of image information, select one of hue, saturation, and brightness in the H8I image. or modulate in combination to generate new H8I
Generate an image. Application examples of each conversion method in the H8I conversion & RGB conversion section 5 are shown in FIGS. 7 to 9.

Next, the H8I conversion method for converting an RGB image into an H8I image will be explained with reference to FIGS. 3 to 6. The H8I image has R, G, and each pixel on the RGB image.
and H of that color from the color produced by mixing B.
, S, and ■. The color of each pixel on an RGB image is determined by the point P(b%1, r) in a coordinate system in which the three axes of red (R), green (G), and blue (B) are orthogonal, as shown in Figure 3. Defined by Note that since the maximum density level of R, G, and B that each pixel of an RGB image can have is finite (255 each for an 8-bit image), the colors of each pixel are all within the cube shown by the dotted line in Figure 3. include.

The lightness l is determined by the origin (0, 0, 0) of the cube mentioned earlier and the vertices (B, G, R) opposite to it, as shown in Figure 4.
Defined on the straight line connecting the That is, this straight line is colorless, and the brightness changes from dark to bright from the origin to the opposite point. Note that, for convenience, this straight line is referred to as the lightness axis. It is assumed that a color P (6, g, r) is given. The lightness of this color is defined by a plane that includes point P and is orthogonal to the lightness axis, and the lightness value is measured from the origin to the intersection W of the plane and the lightness axis.
It is expressed as the distance between That is, the brightness value is determined by the following formula.

I=y'+(r0g+6) If the given color is P (b, y*r), the hue H is the plane shown in Figure 5 that includes the point P and is perpendicular to the lightness axis. defined above. That is, the hue H is the angle formed between a point P and an arbitrary color with the intersection point W between the above-mentioned plane and the lightness axis as the center, as shown in FIG.

It is expressed as Here, blue (g)] is set to θ°, green is set to 120°, and red is set to 24 (ly: l). Therefore, the color P (6, σ, r) and blue (B) The angle formed between the
: number of pits in the image).

Next, the saturation S is a plane containing the point P (6, σ% r) and the point W perpendicular to the lightness axis, and as shown in Fig. Defined on a triangular plane. Saturation S is determined by the distance WP from the brightness axis to point P and the obtained hue angle H from the brightness axis to one side of the triangle? It is expressed as a ratio of distance WE. That is, the saturation S is determined by the following formula.

Next, an RGB conversion method for converting an H8I image into an RGB image will be explained. In the conversion to an RGB image, the R, G, and B density levels necessary to generate the same color as that produced in the field are determined by the hue, saturation, and brightness of each pixel of the H8I image.

The color on the H8I image is defined by the point P (4%8, a). From this point P (A, a, i), r* D,
In order to obtain b, the vector from the brightness axis to point P is decomposed into d and 9.6. First, triangular planes B and G are created by light work.

Since R is determined, on this plane, based on the definitions of hue H and saturation S, the brightness axis and point p (A, #, i), and the hue H and the distance WP from the brightness axis to point P are elements of polar coordinates. Therefore, these are converted into elements of a rectangular coordinate system (with the brightness axis as the origin) on the triangular plane. Accordingly, the following equation is obtained: 0K=WP□□□(H) t=wp picture (H) Next, in order to find the b element of point P, K is projected onto the B axis. The r%Q element can be found by projecting t onto the -1 plane formed by the R and G axes, and by performing these transformations, r*(lsb can be found by the following formula.

r=(thickness-)・stone ψ α6 γ Here, γ=tm-' (0-x) ψ=45°-γ As explained above, display synthesis of color images is performed using the 7L'H8I conversion method and the RGB conversion method. The method for doing this will be explained next. FIG. 7 is a diagram employing the RGB-H8I display composition method. In H8I display synthesis, three images 1 to 3 assigned to RGB are converted into three images 7 to 9 of three color attributes of hue H1 saturation S and brightness ■ in the ll5I conversion unit 6 and displayed. This is a method to do so. In addition,
As explained earlier, the relationship between RGB and H8I is expressed as 1 1 -q (r 1 y 1 b). This more accurate H8I display composition method is particularly effective for RGB images with poor color. RGB
By emphasizing the contrast of the nine-hue image (H) obtained from the image, it is possible to incorporate richer colors. However, since new colors are generated in this method, the displayed image becomes a pseudo-color image. Figure 8 shows the next image using the H8I-RGB display composition method. In this method, image 1 is a hue image H, image 2 is a saturation image S, and image 3 is a hue image H for three images.
is regarded as a brightness image processing unit 10; therefore, the R image 11. This is a method of converting and displaying three images, a G image 12 and a B image 13.

This method is very effective when creating black images in fields such as computer animation because it is easy to visually understand what colors will be displayed. Figure 9 shows the H8I modulation display composition method. The oH8I modulation display synthesis method, which will be explained in the next section, is an effective method when displaying graphic data with surface information such as a geological map or a land use map superimposed on three images.

In this method, image data is expressed in H8I (hue, saturation, brightness) and graphic data is emphasized by adjusting H, S, or depth.
It consists of three processes: conversion to 8I, modulation of H8I image, and conversion to RGB.

A method for modulating a brightness image will be described below, but the same applies to modulating a hue or saturation image. First, each pixel of three images 1 to 3 assigned to the three primary colors of red, green, and black is converted by the H8I conversion unit 6 to form an H image 7.
, S image 8% and I image 9 are determined. Next, the adder 16 adds modulation graphic data 20 (W) to the modulation image 9.
Add and modulate. By this modulation, (1) the brightness increases in the portion where the image 9 and the modulation graphic data 20 overlap, and the graphic data is emphasized. Note that the modulation coefficient α should be set according to the degree of emphasis of the graphic data. At this time, the brightness 1'=the brightness of the I image 9 is 10a-W.

As a result of the above, H' image 17. S' image 18, I' image 1
9 are obtained, and from these images, the RGB conversion unit 10 converts R images 11. G image 12 and B image 13 are obtained by processing more than envy.R image 11%G image 1
Since the three images consisting of the B image 13 and the B image 13 are displayed in color on the color image display 4, images that can be distinguished by color can be obtained for both the color display image and the gray scale display image.

〔Effect of the invention〕

As is clear from the above explanation, F
Although only three types of image information can be displayed, according to the present invention, four or more types of information can be displayed simultaneously, for example, by combining and displaying three types of satellite spectral band images and a land use map. It is possible to partially control the brightness depending on how the ti gradation image is created. Furthermore, it is very effective when creating color images in fields such as computer animation. For example, the hue is given as a hue (H) image and the saturation (S) image, and the brightness (shadow etc.) is given as a brightness (I) image.
By providing an image, the desired color image can be easily created. In addition, in the field of remote sensing, new knowledge that is different from conventional display methods can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the display method of a conventional color image display device, Fig. 2 is a diagram showing an embodiment of the present invention, Fig. 3 is a diagram showing the RGB coordinate system, and Fig. 4 is a diagram showing the definition of brightness. 5 is a diagram showing the definition of hue, FIG. 6 is a diagram showing the definition of saturation, FIG. 7 is a diagram showing the RGB-H8I display composition method according to the present invention, and FIG. 8 is a diagram showing the H8I-RGB FIG. 3 is a diagram showing a display composition method. FIG. 9 is a diagram showing one embodiment of the H8I modulation display synthesis method. 1 to 3...Image, 4...Color image display, 5...H8I&RGB conversion section%6...H8I conversion section%7...H image, 8...S image, 9... 1 image, IO...RGB conversion unit, 11...R image,
12...0 images, 13...3 images, 14 to 16
...Adder, 17...H' image, 18...81
Both images, 19... 17 images, 20... Graphic data for modulation. Patent Applicant Fujitsu Ltd. Representative Patent Attorney Kyo Tani Yobeka 1 Figures 2 Figures 7 Figures - Xδ Figures

Claims (1)

[Scope of Claims] (1) A color image display device that displays a color image by mixing three pixels of red, green, and blue, eight images that give a large image to the red pixels of the color image display device, and the color image described above. 0 image giving an image to the green pixel of the display device, 3 images giving the image to the blue pixel of the color image display device, a first image and a second image given to the color image display device for color display. A third image, and an image in which mutual conversion is performed by matching the density of the three primary colors red, green, and blue to the relationship between the three attributes of the hue, saturation, and brightness of the color created by mixing the three primary colors. The image converting means converts the first image, the second image, and the third image between the three primary colors and the three attributes, and converts each image into the eight images and the three attributes. A display system for a two-image display device, characterized in that the color image display device displays the zero image and the three images. (2) The image conversion means regards the first image as a hue image, the second image as a saturation image, and the third image as a brightness image, and converts the first image into a red image, a green image, and Convert to blue image,
Claim 1 characterized in that the red image is displayed on the color image display device as the 8 images, the green image as the 0 image, and the back image as the 3 images. A display type of the color image display device described in 1. (3) The image conversion means converts the first image of the scribe into a red image;
The second image is regarded as a green image, and the third image is regarded as a blue image, and converted into a hue image, a saturation image, and a brightness image, and the respective images are converted into the R image, the G image, 2. A display system for a color image display device according to claim 1, wherein three images are displayed on the color image display device. (4) The image conversion means has a one-image modulation means, and assumes that the first image is a red image, the second image is a green image, and the third image is a blue image; Convert to a saturation image and a brightness image, and convert any one of the converted tL7'c hue image, saturation image, and brightness image
modulating the image or a plurality of images using the image modulation means,
Convert the hue image, saturation image, and brightness image after modulation to red image, green image, and blue image,
Claim 1 characterized in that the red image is displayed on the color image display device as the 8 images, the green image as the 0 image, and the blue image as the 8 image. The display method of the color image display device described in 2.