JP2002314825A - Color adjustment device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To convert an existing image into an image of color harmony by reflecting the colors of an original image automatically. SOLUTION: RGB data on manuscripts are inputted (S201) and stored in a buffer (S202). A color harmony processing region is selected (S203) and subjected to a representative color extracting process, and two representative colors are determined (204). RGB data on the two representative colors are converted into XYZ data (S207), and the XYZ data are converted into CWD data of an Oswald representative color system (S208). The obtained CWB data of two representative colors are subjected to a coordinate analysis process on the basis of a coordinate analysis database (S209). A color harmony method is selected in representative color coordinate analysis data (S210) and decided (S211). The decided color harmony method data are made to determine on the amount of histogram or the designated weight of each of two representative colors. A selection region undergoes a color harmony processing in accordance with the decided adjustment method data and the weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color adjustment device and a color adjustment method for converting color data in an image into another color data for adjustment.

[0002]

2. Description of the Related Art When a designer decides a color scheme for a graphic created on a computer, the designer determines what color is determined for a certain part as a color for another part. Japanese Patent Application Laid-Open No. 01-809187 discloses a color arrangement system having a function of notifying a graphic editor whether harmony can be achieved by combining the two.

Further, a designer designates a representative point from color image data taken in by a scanner, and a color adjustment based on a correction amount for converting a representative color obtained thereby into a target color designated by the designer. Japanese Patent Application Laid-Open No. 05-119752 discloses a color image color adjustment apparatus and a color adjustment method in which image data of a target area is converted so as not to lose original naturalness.

[0004]

However, in the invention described in Japanese Patent Application Laid-Open No. 01-809187,
When a designer decides a color scheme on a graphic editor, it is a color scheme that informs the user of what color should be combined next for a harmonious color. It is not possible to convert an image that already exists, such as an image captured by.

In the invention described in Japanese Patent Application Laid-Open No. 05-119752, the designer specifies the color after conversion, and performs color harmony by automatically reflecting the color of the original image. I couldn't do that.

The present invention has been made in view of such a situation, and converts various existing images into color-harmonic images by automatically reflecting the colors of the original images. It is an object of the present invention to provide a color adjustment device and a color adjustment method that can perform the color adjustment.

[0007]

According to the present invention, there is provided a color adjusting apparatus for converting color data in a color image into another color data and adjusting the color data, and extracting a plurality of representative colors from a region to be adjusted. Extraction means, storage means for storing color harmony reference data, and a harmony criterion which can be harmonized with minimum correction from the color harmony reference data stored in the storage means, based on the extracted representative color data. And a color correction means for correcting the color of the adjustment target area in accordance with the selected harmony criterion.

Further, the representative color extracting means of the present invention comprises:
A histogram in the color space of the adjustment target area of the color image is obtained, and a color having a large number of pixels is set as a representative color.

Further, the color correcting means of the present invention is configured to allocate a correction amount using an average of the representative colors.

Further, the color correcting means of the present invention allocates the correction amount of the representative color according to a weight based on the size (the number of pixels) of the adjustment target area.

Further, according to the present invention, the weight for allocating the correction amount of the representative color can be set according to the color considered to be important by the user.

Further, the color harmony reference data of the present invention comprises coordinate conversion data to a color space adapted to the color harmony theory and a judgment criterion, and the color harmony criterion selecting means uses these data. The coordinate conversion process and the determination process are performed.

Further, according to the present invention, the color harmony reference data is data in a CWB space adapted to Ostwald's theory of color harmony.

The present invention further comprises a step of extracting a plurality of regions to be adjusted from a color image and representative colors thereof, and a step of obtaining coordinates of the representative colors in a color space adapted to color harmony theory. The present invention relates to a color adjustment method including a step of selecting a harmony criterion that can achieve a combination of representative colors with a minimum correction, and a step of correcting a color of an extracted region based on the selected harmony criterion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a color adjusting apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a color adjusting apparatus according to the present invention. Each unit in the bold frame is a function realizing unit configured in the PC. 101 is a manuscript, 10
2 is a scanner, 103 is an RGB data buffer, 104 is representative color extraction processing means, 105 is a color system conversion processing (RGB → XYZ) means, 106 is a coordinate analysis database, 107 is a color specification System conversion processing (XYZ → R
GB) means 108, coordinate analysis means 109, color harmony method determination means 110, color harmony method determination database 110, representative color correction amount weight determination means 1
12 is a color harmony processing means, 113 is a color system conversion processing (CWB → RGB) means, 114 is a display memory,
Reference numeral 15 denotes a color monitor.

FIG. 2 is a flowchart showing a processing procedure of the color adjusting apparatus shown in FIG. 3A and 3B show an example of a color original to be subjected to color harmony processing. FIG. 3A shows an image before processing, and FIG. 3B shows an image after processing.

The processing of the color adjusting apparatus according to the present invention will be described with reference to the flowchart of FIG. 2 and the block diagram of FIG. First, the color original 101 is scanned by the scanner 1.
02, the obtained RGB data is input and displayed on the color monitor 115 (step S201).
Then, the RGB data is transferred to the data buffer 10 in the PC.
3 (step S202).

The user selects, from the image displayed on the color monitor 115, an area where color harmony processing is to be performed (in FIG. 3A, an area A1 + A2 with a pattern) (step S203). Therefore, the representative color extracting unit 104 performs a representative color extraction process in the selected region where the color harmony process is to be performed, and determines two representative colors (step S20).
4).

In the representative color extraction processing, a histogram is taken in the color space of the color harmony processing target area of the color image, and in the color space of the histogram, the top two colors are set as representative colors in descending order of the number of pixels. The user looks at the result of the two representative colors,
It is determined whether or not this is acceptable (step S205). If not, the process proceeds to step S206, and it is possible to change the setting.

Next, in step S205, the RGB data of the two representative colors finally determined is converted into XYZ data (step S207), and further converted into CWB data which is an Ostwald color system (step S207). S2
08).

First, the RGB data is converted into XY data based on the coordinate analysis database 106.
To convert to Z data, a color system conversion process (RGB →
XYZ) means 105 converts the RGB data into XYZ data, and further, a color system conversion processing (XYZ → CWB) means 107 for converting the RGB data into CWB data.
Processing is performed by converting YZ data into CWB data. That is, the color system conversion processing (RGB → XYZ) means 105 and the color system conversion processing (XYZ → CWB) means 10
Reference numeral 7 denotes a processing unit that performs coordinate conversion using the color harmony reference data.

Next, coordinate analysis processing is performed on the two representative colors of CWB data obtained in step S208 (step S209).

The coordinate analysis of the CWB data is performed by the CW
The analysis is performed based on the coordinate analysis database 106 in order to perform the coordinate analysis of the B data. A color harmony method is selected (step S210) and determined (step S211) based on the coordinate analysis data of the two representative colors obtained in step S209.

The color harmony method selection / decision processing is performed by the color harmony method determination (harmony criterion selection) means 109 and the coordinate analysis data obtained from the coordinate analysis means 108 and the color harmony method for determining the color harmony method. Based on the determination (color harmony criterion) database 110, a harmony method that satisfies Ostwald's color harmony theory and that minimizes the amount of conversion (requires less coordinate movement) is selected and determined. The criterion is stored in the color harmony method determining database 110, and is determined by the color harmony method determining means 109.

Further, the color adjustment method data determined in step S211 is added to the histogram amounts of the two representative colors obtained in step S204 or specified by the user (in step S206, the user changes the representative color. In this case, the weight is determined (step S212). The weight determining process is performed by the representative color correction weight determining unit 111. Step S2
In step 13, the user determines the color adjustment method data determined in step S211 and the weight determined in step S212, and if a change is required, the user proceeds to step S21.
It is also possible to return to 1 and to determine again.

Then, according to the color adjustment method data determined in step S213 and the weight, the color harmony process of the area selected by the user is executed (step S2).
14). This processing is performed by the color harmony processing means 112.
The user sees the result of the color harmony process performed in step S214, and determines whether or not this is appropriate (step S215). If not, the user can return to step S210 and order reprocessing.

Next, the CWB data is converted into RGB data by CWB / RGB conversion, stored in the display memory 114, and output to the color monitor 115 (step S21).
6). The conversion process of CWB data to RGB data is R
Coordinate analysis database 1 for converting to GB data
06 based on color system conversion processing (CWB → RGB)
13 converts the CWB data into RGB data, stores it in the display memory 114, and outputs it to the color monitor 115.

FIG. 3B shows an image subjected to the color harmony process as described above. FIG. 3B is an image example when the value of the weight amount is increased for the color of A2.

Next, more detailed processing contents of each function realizing means in the block diagram of FIG. 1 will be described. Processing of color system conversion processing (RGB → XYZ) means 105 The conversion from RGB data to XYZ data is a well-known fact based on the principle of color television, but is obtained by the following method. X = 0.6067R + 0.1736G + 0.2001B Y = 0.298R + 0.5868G + 0.1144B Z = 0.0661G + 1.1150B

The value of this numeral changes depending on the target display device. Processing by the color system conversion processing (XYZ → CWB) means 107 Conversion from XYZ data to CWB data is obtained by the following method. X = W × Xw + C × Xc Y = W × Yw + C × Yc Z = W × Zw + C × Zc W + B + C = 100

Here, Xw, Yw, and Zw are tristimulus values for white, Xc, Yc, and Zc are tristimulus values for pure colors. W, B, and C are white, black, and pure color amounts. Pure color X
YZ has 24 hues in the Ostwald color system. Processing of coordinate analysis means 108 The coordinates obtained by the representative color extraction processing means 104 are analyzed.

The analysis items are as follows. 1. Determine whether it is chromatic or achromatic. 2. It is determined whether the hues are the same or not. 3. It is determined whether the color wheel is an equivalent color wheel or not. -Processing of the color harmony method determining means 109 Based on the data shown in the coordinate analysis database 106,
A harmony method that requires the least coordinate transformation (for example, harmony in an achromatic color, harmony in an equal hue triangle, harmony in an equivalent color wheel, etc.) is determined.

FIG. 4 is a diagram for explaining a harmony method in an equivalent color wheel. As shown in the figure, if any of the parameters of the CWB match, color harmony can be achieved. If the result of analysis by the coordinate analysis means 108 is the same hue, for example, the first representative color "a" is 85.5C, 3.5W, 11B,
The second representative color “b” is 47.1C, 8.9W, 44B
And The absolute value | ab− of the difference between “a” and “b” is
Since 38.4C, 5.4W, and 33B are obtained, and 5.4W is the smallest value, in order to harmonize the two representative colors "a" and "b", W of "a" and "b" is used. Is the method of minimizing the movement of the coordinates.

If the weighting amounts indicated by the representative color correction amount weight determining means are the same for the two representative colors, the average of the W coordinates of the representative color "a" and the representative color "b" is calculated. W6.
Let it be 2. Further, since the value of W of the representative color “a” was changed to 6.2 from W + C + B = 100, the proportional constant “k” was applied to the values of C and B, and k × 85.5C + 6.2W +
Assuming that k × 11B = 100, “k” is calculated and obtained, and the representative color “a” is changed to 83.1C, 6.2W, and 10.7B. Similarly, the value of W of the representative color “b” is obtained as 6.2, and is changed to 48.5C + 6.2W + 45.3B. As described above, the equal white series harmony in the equal hue triangle can be formed. (If hue is different)

FIG. 5 is a diagram showing the color circle of Ostwald. The Ostwald hue circle is composed of 24 hues as shown in the figure. Now, the hue of the first representative color “a” is 1Y, and the CWB is 85.6C, 3.5W, 11B.
And the hue of the second representative color “b” is 3P and CW
If B is 47.1C, 8.9W, 44B, and the weighting amounts are the same for the two representative colors, the two are averaged, and the CWB is calculated as 66.3C, 6.2W, 27.5B. By doing so, harmony in the equivalent color wheel can be achieved. In the case of a printer, the original image file is subjected to the conversion process by the above-described method and printed.

[0036]

According to the color adjusting apparatus of the present invention, a plurality of colors having a large number of pixels are set as representative colors from a region to be adjusted, and a color harmony reference is selected from the data of the plurality of representative colors. Correcting the color of the area according to the color harmony criterion obtained, and, when selecting the color harmony criterion, by selecting a color harmony criterion that minimizes the sum of the correction amounts of the plurality of representative colors, As a whole, the effect of the color correction can be minimized, and the image can be converted into a color-harmonic image with the colors of the original image automatically reflected.

Further, according to the color adjusting apparatus of the present invention, the representative color of the adjustment target area can be represented well, and the influence of the correction of the color of the target area can be reduced.

Further, according to the color adjusting apparatus of the present invention, it is possible to minimize the influence of the correction of the color of the adjustment target area as a whole and to achieve the harmonization of the color arrangement.

Further, according to the color adjusting apparatus of the present invention, the change from the original color is reduced in a region occupying a larger area, so that the tone of the entire image is maintained as much as possible and the harmony of the color arrangement is maintained. Can be planned.

Further, according to the color adjusting apparatus of the present invention, it is possible to adjust the color arrangement while retaining the colors considered important by the user.

Further, according to the color adjusting apparatus of the present invention, by performing coordinate conversion to a color space adapted to the theory of color harmony, it is simple to determine which harmony standard should be selected.

Further, according to the color adjusting apparatus of the present invention, it is simple to determine which harmony sequence should be used for harmony.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a color adjusting apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing procedure of the color adjustment device illustrated in FIG. 1;

FIG. 3 is a diagram illustrating an example of a color original to be subjected to color harmony processing by the color adjustment device of the present invention.

FIG. 4 is a diagram for explaining a harmony method in an equivalent color wheel by the color adjustment device of the present invention.

FIG. 5 is a diagram showing a color circle of Ostwald.

[Explanation of symbols]

101: Document, 102: Scanner, 103: RGB Data Buffer, 104: Representative Color Extraction Processing Unit, 105:
Color system conversion processing (RGB → XYZ) means, 106: database for coordinate analysis, 107: color system conversion processing (XYZ)
→ RGB) means, 108: coordinate analysis means, 109: color harmony method determination means, 110: color harmony method determination database, 111: weight determination means for representative color correction amount, 112
... Color harmony processing means 113 ... Color system conversion processing (CWB
→ RGB) means, 114: display memory, 115: color monitor.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) H04N 1/46 H04N 1/46 Z (72) Inventor Masanori Minami 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation F-term (reference) PP32 PP35 PP58 PQ19 PQ22 SS07 5C079 HB01 HB05 HB06 HB11 LA02 LA06 LA10 LB12 MA01 NA06 5L096 AA02 AA06 DA01 FA15 FA35 GA41 JA24 MA03

Claims (9)

[Claims] 1. A color adjustment device for converting color data in a color image into another color data and adjusting the color data, wherein a representative color extracting means for extracting a plurality of representative colors from a region to be adjusted, and color harmony reference data. And a harmony criterion selecting means for selecting a harmony criterion that can be harmonized with the minimum correction from among the color harmony criterion data stored in the storage means, based on the extracted representative color data. And a color correction unit that corrects the color of the adjustment target area in accordance with the selected harmony criterion. 2. The color adjusting device according to claim 1, wherein
The representative color extraction unit takes a histogram in the color space of the adjustment target area of the color image, and extracts a color having a large number of pixels,
A color adjusting device, wherein the representative color is used. 3. A color adjusting apparatus according to claim 1, wherein said color correcting means allocates a correction amount using an average of said representative colors. 4. The color adjustment device according to claim 1, wherein the color correction unit allocates the correction amount of the representative color according to a weight based on a size (the number of pixels) of the adjustment target area. A color adjustment device, characterized in that: 5. The color adjustment device according to claim 1, wherein a weight for allocating the correction amount of the representative color can be set according to a color considered to be important by a user. Color adjustment device. 6. The color adjustment device according to claim 1, wherein the color harmony reference data includes coordinate conversion data to a color space conforming to color harmony theory, and a determination criterion, The color adjustment apparatus according to claim 1, wherein the color harmony reference selection unit performs a coordinate conversion process and a determination process using the data. 7. The color adjusting device according to claim 6, wherein
The color adjustment device according to claim 1, wherein the color harmony reference data is in a CWB space adapted to Ostwald's theory of color harmony. 8. A combination of a plurality of regions to be adjusted and a representative color thereof from a color image, a step of obtaining coordinates of the representative colors in a color space adapted to color harmony theory, a combination of the representative colors Selecting a harmony criterion that can be achieved with minimum correction, and correcting the color of the extracted area based on the selected harmony criterion. 9. A computer-readable recording medium in which a program for causing a computer to function as the color adjustment device according to claim 1 is recorded.