JPH03279996A - Method and device for character and pattern processing - Google Patents

Abstract

PURPOSE:To see characters and patterns in the same color by correcting the colors of characters and patterns when the characters and patterns of the same color are arranged on a background of a different color. CONSTITUTION:A lightness difference correction part 14 finds the correcting quantity for the lightness of the character color from the difference in lightness between the background color and character color by using a lightness correction table and corrects the lightness of the character color and a hue difference correction part 15 finds the correcting quantity for the hue of the character color from the hue difference between the background color and character color by using a hue correction table and corrects the hue of the character color. Then a chroma difference correction part 16 finds the correcting quantity for the chroma of the character color from the chroma difference between the background color and character color by using a chroma correction table and corrects the chroma of the character color. Those processes are carried out for characters 1b - 3b to correct the lightness, hue, and chroma of each character, and the characters 1b - 3b and backgrounds 1a - 3a are outputted in the form of a soft copy on a display device, etc., or hard copies such as various prints according to character color information after the correction. Consequently, the respective characters 1b - 3b are seen in the same color.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a text/figure processing method and device for adjusting the color of text/figures so that the text/figures appear as specified regardless of the background color. It is something.

[Prior Art] The color of characters and figures is affected by the color of the surrounding background and appears to be a different color. For example, as shown in FIG. 2, even if the characters 1b to 3b are of the same color, if the background colors are different like 1a to 3a, the colors of the characters 1b to 3b will appear different.

The phenomenon in which the color and brightness of a certain character or figure appear to change depending on the color and brightness of the surrounding background is called color contrast, and the degree of this change is called contrast effect. Color contrast has the following characteristics.

■0 The colors of characters and figures appear to move away from the background color on the color wheel. Regarding brightness, bright objects appear brighter and dark objects appear darker depending on the background color. Regarding vividness, colors with higher saturation than the background color appear higher, and colors with lower saturation appear lower.

■0 The smaller the character or figure, the greater the contrast effect.

[3] The larger the area of the background color, the greater the contrast effect.

[4] The more the background color area and the character or figure area are in contact, the greater the contrast effect.

■The smaller the contrast between the brightness of a single character or figure and the background color, the greater the color contrast effect.

[6] If the brightness is the same, increasing the saturation of the background color will also increase the contrast effect.

[7] When complementary colors are used, the hue does not change and the saturation appears to have increased.

[Problem to be solved by the invention] When designing a package or a magazine cover using computer graphics etc. to achieve the color contrast as described above, it is necessary to designate colors by considering the color contrast. Without it, there was a problem that the colors would not look the same.

[Means for Solving the Problems] The present invention has been made based on the above points, and provides a character/figure that adjusts the color of each character/figure so that each character/figure appears to have the same color regardless of the background color. The purpose is to provide a processing method and device, and its features are:
In the text/figure processing method that corrects the text/figure color based on the background color, the brightness, hue, and saturation of one character/figure are corrected based on the brightness difference, hue difference, saturation difference, and area ratio between the background color and the text/figure color. This is what I did.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of a character/graphics processing device of the present invention. Each block is as follows.

4a: Background color brightness register. The brightness information of the color of the background portion (hereinafter referred to as background color) is stored.

4b; Text color brightness register. The brightness information of the color of the character/graphic portion (hereinafter referred to as character color) is stored.

5; Brightness difference calculation unit. The difference in brightness between the background color and character color stored in the background color brightness register 4a and the character color brightness register 4b is calculated.

6a; Background color hue register. Stores the hue information of the background color.

6b: Character color hue register. Stores the hue information of the text color.

7; Hue difference calculation unit. The hue difference between the background color and text color stored in the background color/hue register 6a and the text color/hue register 6b is calculated.

8a; Background color saturation register. Memorizes the saturation information of the background color.

8b; Character color saturation register. Stores text color saturation information.

The chroma saturation difference calculating section calculates the saturation difference between the background color and the character color stored in the background chroma saturation register 8a and the literary chroma saturation register 8b.

10a; Background color area calculation unit. Calculate the area of the background part.

10b; Character color area calculation unit. Calculate the area of the character shape part.

Each area is calculated by, for example, counting the number of pixels of the background color and text color.

11; Area ratio calculation unit. The area ratio between the area of the background portion and the area of the character graphic portion calculated by the background color calculation unit 10a and the character color area calculation unit 10b is calculated. If the calculated area ratio exceeds a certain value, the area ratio determination signal is turned on.

12; Brightness difference determination unit. Based on the brightness difference between the background color and the character color calculated by the brightness difference calculation unit 5, it is determined whether the brightnesses of both are close to each other, and if the two are sufficiently close, the equal brightness determination signal is turned on.

13; Hue difference determination unit 0 Based on the hue difference between the background color and character color calculated by the hue difference calculation unit 7, it is determined whether the two are in a complementary color relationship, and if they are complementary colors, the complementary color determination signal is turned on.

14; Brightness difference correction section. It has a brightness correction table that associates the brightness difference with the brightness correction amount, calculates the brightness correction amount of the text color from the brightness difference between the background color and the text color, and corrects the brightness of the text color. When the area ratio determination signal is on, the correction amount is multiplied by the correction coefficient.

However, when the complementary color determination signal is on, the brightness of the character color is not corrected.

15; Hue difference correction section. It has a hue correction table that associates the hue difference with the hue correction amount, calculates the correction amount of the hue of the text color from the hue difference between the background color and the text color, and corrects the hue of the text color. When the area ratio determination signal is on, the correction amount is multiplied by the correction coefficient 916; chroma difference correction section. It has a saturation correction table that associates the saturation difference with the saturation correction amount, and calculates the text color saturation correction amount from the saturation difference between the background color and the text color.
Correct the saturation of text color. When the area ratio determination signal is on, the correction amount is multiplied by the correction coefficient.

Further, the correction coefficient is also multiplied when the complementary color determination signal is on and when the equal lightness signal is on.

17; Text color brightness correction register. Stores the brightness information of the corrected text color.

18; Text color hue correction register. Stores the hue information of the corrected text color.

19; Character color saturation correction register. Stores the saturation information of the corrected text color.

Next, the operation of the present invention will be explained using the case of FIG. 2 as an example.

First, information on the background color and text color is input to the text/graphics processing device of this embodiment. Specifically, information on the background color and character color of the back PC 1a and the characters 1b shown in FIG. 2 is input. The information on the background color and text color is preferably expressed in a color system that specifies colors in terms of brightness, hue, and saturation, such as the Munsell color system.

Information on the brightness, hue, and saturation of the input background color and text color is stored in the background color lightness register 4a, text color lightness register 4b, background color hue register 6a, text color hue register 6b, and background color saturation register 8a, respectively. , are stored in the character chroma register 8b.

Next, the brightness difference calculation unit 5 uses the background color brightness information stored in the background color brightness register 4a and the character color brightness register 4.
The brightness difference is calculated from the brightness information of the character color stored in b.

Similarly, the hue difference calculation unit 7 calculates a hue difference from the hue information of the background color stored in the background color hue register 6a and the hue information of the character color stored in the character color hue register 6b.

Similarly, the saturation difference calculation unit 9 calculates the saturation difference from the background color saturation information stored in the background chroma saturation register 8a and the character color saturation information stored in the character chroma saturation register 8b. do.

On the other hand, the background color area calculation unit 10a and the character color area calculation unit 10
b is the background of FIG. 2 respectively] Calculate the areas of a and character 1b. As described above, each area is calculated by, for example, counting the number of pixels of the background color and text color.

Then, the area ratio calculation section 11 calculates the area ratio between the areas of the background portion and the text/graphic portion calculated by the background color calculation section 10a and the text color area calculation section 10b. If the calculated area ratio exceeds a certain value, the area ratio determination signal is turned on.

Next, the brightness difference determining unit 12 determines whether the brightness of the background color and the character color are close based on the brightness difference between the background color and the character color calculated by the brightness difference calculating unit 5, and if the two are sufficiently close, the equal brightness determination signal is turned on. Make it.

Further, the hue difference determination section 13 determines whether or not the background color and text color have a complementary color relationship based on the hue difference between the background color and the character color calculated by the hue difference calculation section 7, and if they are complementary colors, a complementary color determination signal is turned on.

Next, the brightness difference correction unit 14 calculates the amount of correction for the brightness of the text color from the brightness difference between the background color and the text color from the brightness correction table.
When the 0 area ratio determination signal for correcting the brightness of the character color is on, the correction amount obtained from the brightness correction table is multiplied by the correction coefficient.

The brightness information after the text color correction is sent to the text color brightness correction register 17 and stored therein.

Next, the hue difference correction unit 15 calculates the amount of correction for the hue of the text color from the hue difference between the background color and the text color from the hue correction table.
When the 6 area ratio determination signal for correcting the hue of the character color is on, the correction amount obtained from the hue correction table is multiplied by the correction coefficient. However, when the complementary color determination signal is on, the hue of the character color is not corrected.

The hue information after the correction of the text color is sent to the text color/hue correction register 18 and stored therein.

Next, the saturation difference correction unit 16 calculates the amount of correction for the saturation of the text color from the saturation difference between the background color and the text color from the saturation correction table.
Correct the saturation of text color. When the area ratio determination signal is on, the correction amount obtained from the saturation correction table is multiplied by the correction coefficient. Further, the correction coefficient is also multiplied when the complementary color determination signal is on and when the equal lightness signal is on.

The corrected text color saturation information is sent to the text color saturation correction register 19 and stored therein.

When the above processing is completed, the character color brightness correction register 17
, the character color/hue correction register 181 and the character chroma saturation correction register 19 output brightness information, hue information, and saturation information after correction of the character color, respectively.

The above process is also performed for characters 2b and 3b in Figure 2,
The brightness, hue, and saturation of each character color are corrected, and based on the corrected character color information, each character 1b to 3b and background 18 to 3 are
If a is output in the form of a soft copy such as a display device or in the form of a hard copy such as various types of printing, each character 1b to 3b
appear to be the same color.

[Effects of the Invention] As described above, according to the present invention, when characters or figures of the same color are arranged on backgrounds of different colors, the colors are corrected so that each character or figure appears to be the same color. When designing packages or magazine covers using graphics, for example, even if you specify a color without considering color contrast, the colors will be corrected so that the text and figures appear to be the same color. This brings about this effect.

[Brief explanation of drawings]

A block diagram showing an embodiment of the character/graphic processing device of the present invention,
FIG. 2 is a diagram explaining color contrast. 4a...Background color lightness register 4b...Text color lightness register 5...Brightness difference calculation unit 6a...Background color hue register 6b...Text color hue register 7... Hue difference calculation unit 8a... Background chroma saturation register 8b... Character chroma saturation register 9... Saturation difference calculation unit 10a... Background color area calculation unit 10b... Text color area calculation unit 11...Area ratio calculation unit 12...Brightness difference determining unit 13...Hue difference determining unit 14...Brightness difference correcting unit 15...・Hue difference correction section 16...Saturation difference correction section

Claims (2)

[Claims] (1) In a text/figure processing method that corrects the text/figure color based on the background color, the lightness, hue, and saturation of the text/figure are determined based on the lightness difference, hue difference, saturation difference, and area ratio between the background color and the text/figure color. A character/figure processing method characterized by correcting. (2) A character and graphic processing device that corrects a character and graphic color based on a background color, characterized by comprising the following components. [1] A brightness difference calculation unit that calculates the brightness difference between the background color and the character/figure color. [2] A hue difference calculation unit that calculates the hue difference between the background color and the character/figure color. [3] A saturation difference calculation unit that calculates the saturation difference between the background color and the character/figure color. [4] An area ratio calculation unit that calculates the area ratio between the areas of the background portion and the character/figure portion, and turns on an area ratio determination signal when the calculated area ratio exceeds a certain value. [5] Based on the brightness difference between the background color and the character/figure color calculated by the brightness difference calculating section, it is determined whether the brightness of both is close, and if both are sufficiently close, the brightness of turning on the equal brightness determination signal. Difference judgment part. [6] Based on the hue difference between the background color and the character/figure color calculated by the hue difference calculation unit, it is determined whether or not the two are in a complementary color relationship, and if they are complementary colors, a hue difference determination signal is turned on to turn on a complementary color determination signal. Department. [7] It has a brightness correction table that associates the brightness difference with the brightness correction amount, calculates the brightness correction amount of the text and graphic color from the brightness difference between the background color and the character and graphic color, and corrects the brightness of the character and graphic color. The brightness difference correction unit, however, multiplies the brightness correction amount by a correction coefficient when the area ratio determination signal is on. [8] It has a hue correction table that associates the hue difference with the amount of hue correction, calculates the amount of correction for the hue of the text and graphics color from the hue difference between the background color and the text and graphics color, and corrects the hue of the text and graphics color. The hue difference correction section, however, multiplies the hue correction amount by a correction coefficient when the area ratio determination signal is on, and does not perform hue correction when the complementary color determination signal is on. [9] has a saturation correction table that associates the saturation difference with the saturation correction amount, and calculates the correction amount of the saturation of the text and graphics color from the saturation difference between the background color and the text and graphics color, and calculates the saturation correction amount of the text and graphics color. A saturation difference correction unit that corrects the saturation of the color saturation. However, when the area ratio judgment signal is on, when the complementary color judgment signal is on, and when the equal lightness signal is on, each correction coefficient is applied to the saturation correction amount. Multiply.