Apparatus and method for adjusting primary color component of image, and computer-readable recording media for storing computer program

• US 7,646,393 B2
• Filed: 05/02/2005
• Issued: 01/12/2010
• Est. Priority Date: 05/06/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choe, Wonhee, Park, Dusik, Kim, Changyeong
• Primary Examiner(s): GOOD JOHNSON, MOTILEWA
• Application Number:
  US11/118,482
• Publication Number:
  US 20050248581A1
• Time in Patent Office: 1,716 Days
• Field of Search: 345/600
• US Class Current: 345/604
• CPC Class Codes: H04N 1/6075 Corrections to the hue
• CPC Class Codes: H04N 1/62 Retouching, i.e. modification of isolated colours only or in isolated picture areas only

Abstract

An apparatus for and a method of adjusting a primary color component of an image and a computer-readable recording medium for storing a computer program for controlling the apparatus. The apparatus includes: a weight determiner which determines a weight corresponding to a hue difference between a hue of each of plural object hue components and a hue of adjustment primary color; and a component adjuster which adjusts at least one of object hue and saturation components using at least one of saturation and hue adjustment amounts of the adjustment primary color and the weight. The object hue and saturation components are components of hue and saturation components of an input image belonging to an adjustment range, the adjustment range belongs to a region of a color space in which color interference between the adjustment primary color and a neighboring primary color occurs, the adjustment primary color corresponds to a primary color to be adjusted, and the neighboring primary color corresponds to a primary color neighboring the adjustment primary color.

Claims

1. An apparatus for adjusting a primary color component of an image, comprising:

a weight determiner which determines a weight based on a determined hue difference between a hue of each of plural object hue components and a hue of an adjustment primary color; and

a component adjuster which adjusts at least one of the object hue components and a saturation component using at least one of a saturation adjustment amount and a hue adjustment amount of the adjustment primary color and the weight,

wherein the object hue and saturation components are hue and saturation components of an input image belonging to an adjustment range, the adjustment range belongs to a region of a color space in which color interference between the adjustment primary color and a neighboring primary color occurs, the adjustment primary color corresponds to a primary color to be adjusted, and the neighboring primary color corresponds to a primary color neighboring the adjustment primary color,

wherein, in the determining of the weight, a determined weight based on an absolute value of a first hue difference is determined to affect adjustment of the at least one object hue components and the saturation component more than an adjustment affect of a determined weight based on an absolute value of a second hue difference when the absolute value of the first hue difference is less than the absolute value of the second hue difference.

2. The apparatus of claim 1, wherein the adjustment range is predetermined by a user or adjusted later on, and the number of the adjustment range is 1 or over.

3. The apparatus of claim 1, wherein the primary color is one of red (R), green (G), blue (B), cyan (C), magenta (M), or yellow (Y) or a combination of any of R, G, B, C, M, and Y.

4. The apparatus of claim 1, wherein the component adjuster adjusts the object saturation component up to a maximum saturation and the object hue component up to one of the adjustment primary color or the neighboring primary color.

5. The apparatus of claim 1, further comprising:

a component determiner which extracts the hue and saturation components from color information of the input image and selects the object hue and saturation components from the extracted hue and saturation components.

6. The apparatus of claim 5, wherein the component determiner includes:

a color space converter which converts a specified color space in which the color information is represented into another type of color space;

a component extractor which extracts the hue and saturation components from the color information which has been represented in the converted specified color space; and

a component selector which selects the object hue and saturation components belonging to the adjustment range from the extracted hue and saturation components and outputs the selected object hue and saturation components.

7. The apparatus of claim 6, wherein the another type of color space is a color space in which the saturation and hue are extracted from the input image.

8. The apparatus of claim 6, wherein the specified color space is one of an RGB color space, a hue, saturation, and lightness (HSV) color space, or a luminance and chrominance (YCbCr) color space and the another type of color space is another of the RGB color space, the HSV color space, or the YCbCr color space.

9. The apparatus of claim 1, wherein the weight determiner determines that the smaller an absolute value of the hue difference becomes, the larger the weight becomes or the larger the absolute value of the hue difference becomes, the smaller the weight becomes.

10. The apparatus of claim 9, wherein the weight determiner determines weights using one of the following equations:

$\begin{array}{c}{W}_1=k-l<br><br><br><br>2<br><br>\mathrm{kx}<br><br>\left(\frac{h_I+\mathrm{\theta <br><br>}}{2<br><br>\mathrm{\theta <br><br>}}-\mathrm{round}<br><br>\left(\frac{h_I+\mathrm{\theta <br><br>}}{2<br><br>\mathrm{\theta <br><br>}}\right)\right)-\mathrm{kl};<br><br>\mathrm{or}\\ \begin{array}{cc}{W}_2=k-l<br><br><br><br>2<br><br>\mathrm{kx}<br><br>\left(\frac{h_I}{2<br><br>\mathrm{\theta <br><br>}}-\mathrm{round}<br><br>\left(\frac{h_I}{2<br><br>\mathrm{\theta <br><br>}}\right)\right)-\mathrm{kl},& \end{array}\end{array}$

wherein W₁ denotes a weight determined when the adjustment primary color is one of R, G, and B, W₂ denotes a weight determined when the at least one adjustment primary color is one of C, M, and Y, k denotes a maximum value of the weights, 2θ

denotes an angle of the adjustment range, h_I denotes a hue of the object hue component to be adjusted, and round(x) denotes a value obtained by removing a value less than a decimal point from x.

11. The apparatus of claim 10, wherein the component adjuster includes:

an adjustment value calculator which calculates at least one of saturation and hue adjustment values using at least one of the saturation and hue adjustment amounts and the weight; and

a component output unit which adjusts at least one of the object hue and saturation components using at least one of the saturation and hue adjustment values.

12. The apparatus of claim 11, wherein the adjustment value calculator calculates the saturation and hue adjustment values using the one of the following equations:

DELTA_S=Δ

s₁xW₁+Δ

s₂xW₂; and

DELTA_h=Δ

h₁xW₁+Δ

h₂xW₂,

wherein DELTA_s denotes the saturation adjustment value, DELTA_h denotes the hue adjustment value, and, when the adjustment primary color is one of R, G, and B, Δ

s₁ denotes the saturation adjustment amount of the adjustment primary color, Δ

h₁ denotes the hue adjustment amount of the adjustment primary color, and W₁ denotes the determined weight, or when the adjustment primary color is one of C, M, and Y, Δ

s₂ denotes the saturation adjustment amount of the adjustment primary color, Δ

h₂ denotes the hue adjustment amount of the adjustment primary color, and W₂ denotes the determined weight.

13. The apparatus of claim 12, wherein the component output unit adjusts at least one of the object hue and saturation components using the following equations:

s_o=s_I+DELTA_sx(1−

s_l)

h_o=DELTA_hxθ

+h_I

wherein s_O denotes the object saturation component that has been adjusted, s_I denotes the object saturation component to be adjusted, h_O denotes the object hue component that has been adjusted, and h_I denotes the object hue component to be adjusted.

14. The apparatus of claim 11, wherein the component output unit adjusts a saturation of the object saturation component depending on whether the object saturation component belongs to a low saturation region or a high saturation region.

15. The apparatus of claim 14, wherein the component output unit adjusts the object saturation component depending on whether the object saturation component belongs to the low or high saturation region, using the following equations:

$\begin{array}{c}{s}_o=s_1+{\mathrm{DELTA}}_s<br><br>x<br><br>\left(1-s_I\right),\mathrm{if}<br><br><br><br>s_I<<br><br>\mathrm{sGP};<br><br>\mathrm{or}\\ s_o=s_1+{\mathrm{DELTA}}_s<br><br>x<br><br>\left(1-s_I\right)<br><br>x<br><br>\left(\frac{s_I}{\mathrm{sGP}}\right),\mathrm{if}<br><br><br><br>s_I\ge <br><br>\mathrm{sGP}\end{array}$

wherein s_O denotes the object saturation component that has been adjusted, s_I denotes the object saturation component to be adjusted, DELTA_s denotes the saturation adjustment value, and sGP denotes a predetermined threshold value, where s_I<

sGP in the low saturation region or s_I≧

sGP in the high saturation region.

16. The apparatus of claim 15, wherein the saturation adjustment value DELTA_s is represented as by the following equation:

DELTA_s=Δ

s₁xW₁+Δ

s₂xW₂,

wherein, when the adjustment primary color is one of R, G, and B, Δ

s₁ denotes the saturation adjustment amount and W₁ denotes the determined weight, or when the adjustment primary color is one of C, M, and Y, Δ

s₂ denotes the saturation adjustment amount and W₂ denotes the determined weight.

17. A method of adjusting a primary color of an image, comprising:

determining a weight based on a determined hue difference between a hue of each of plural object hue components and a hue of adjustment primary color; and

adjusting, using at least one processing device, at least one of object hue and saturation components using at least one of saturation and hue adjustment amounts of the adjustment primary color and the weight,

wherein the object hue and saturation components are hue and saturation components of an input image belonging to an adjustment range, the adjustment range belongs to a region of a color space in which color interference between the adjustment primary color and a neighboring primary color occurs, the adjustment primary color corresponds to a primary color to be adjusted, and the neighboring primary color corresponds to a primary color neighboring the adjustment primary color,

wherein, in the determining of the weight, a determined weight based on an absolute value of a first hue difference is determined to affect adjustment of the at least one object hue and saturation components more than an adjustment affect of a determined weight based on an absolute value of a second hue difference when the absolute value of the first hue difference is less than the absolute value of the second hue difference.

18. The method of claim 17, further comprising:

extracting the hue and saturation components from color information of an input image and selecting the object hue and saturation components from the extracted hue and saturation components.

19. A computer-readable recording medium storing a computer program for controlling an apparatus to perform a method of adjusting saturation and hue components of an input image, the method comprising:

determining a weight based on a determined hue difference between a hue of each of plural object hue components and a hue of adjustment primary color; and

adjusting at least one of object hue and saturation components using at least one of saturation and hue adjustment amounts of the adjustment primary color and the weight,

wherein the object hue and saturation components are hue and saturation components of an input image belonging to an adjustment range, the adjustment range belongs to a region of a color space in which color interference between the adjustment primary color and a neighboring primary color occurs, the adjustment primary color corresponds to a primary color to be adjusted, and the neighboring primary color corresponds to a primary color neighboring the adjustment primary color,

wherein, in the determining of the weight, a determined weight based on an absolute value of a first hue difference is determined to affect adjustment of the at least one object hue and saturation components more than an adjustment affect of a determined weight based on an absolute value of a second hue difference when the absolute value of the first hue difference is less than the absolute value of the second hue difference.

20. The computer-readable recording medium of claim 19, wherein method further includes:

extracting the hue and saturation components from color information of the input image and selecting the object hue and saturation components from the extracted hue and saturation components.

21. An apparatus for preventing color representation error when an object saturation of an input image is achromatic or has a neighboring value, comprising:

a weight determiner which determines a weight based on a determined hue difference between a hue of each of plural object hue components and a hue of an adjustment primary color; and

a component adjuster which adjusts at least one of the object hue components and a saturation component using at least one of a saturation adjustment amount and a hue adjustment amount of the at least one adjustment primary color and the weight,

wherein the object hue and saturation components are hue and saturation components of an input image belonging to an adjustment range of a region of a color space in which color interference between the adjustment primary color and a neighboring primary color occurs, the adjustment primary color corresponds to a primary color to be adjusted, and the neighboring primary color corresponds to a primary color neighboring the adjustment primary color,

wherein, in the determining of the weight, a determined weight based on an absolute value of a first hue difference is determined to affect adjustment of the at least one object hue components and the saturation component more than an adjustment affect of a determined weight based on an absolute value of a second hue difference when the absolute value of the first hue difference is less than the absolute value of the second hue difference.