Multiple color transformation apparatus, method of forming image, and a computer-readable recording medium storing computer program

• US 20050259110A1
• Filed: 04/28/2005
• Published: 11/24/2005
• Est. Priority Date: 04/30/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Changveong, Choe, Wonhee, Lee, Seongdeok, Ok, Hyunwook
• Application Number:
  US11/116,437
• Publication Number:
  US 20050259110A1
• Time in Patent Office: Days
• US Class Current: 345/591
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

A multiple color transformation apparatus and method for an image and a computer readable recording medium storing a computer program therefore are provided. The multiple color transformation apparatus includes a middle status chrominance component producer which linearly combines first through M^th (where M is a positive integer larger than “3”) input chrominance components to represent a color of each of pixels of the image to produce first through N^th (where N is greater than or equal to M) middle status chrominance components; and a chrominance component compensator which relatively differently adjusts luminance levels of the first through N^th middle status chrominance components according to degrees to which the first through N^th middle status chrominance components contribute to representing a single color and outputs the first through N^th middle status chrominance components having the adjusted luminance levels as color-compensated first through N^th middle status chrominance components. Therefore, using the multiple color transformation apparatus and method, a number of input chrominance components can be transformed into a variety of chrominance components while maximizing a luminance and color saturation of an image display device.

Claims

1. A multiple color transformation apparatus for an image comprising pixels, comprising:

a middle status chrominance component producer which linearly combines first through M^th (where M is a positive integer greater than or equal to “

3”

) input chrominance components to represent a color of each of the pixels to thereby produce first through N^th (where N is greater than or equal to M) middle status chrominance components; and

a chrominance component compensator which relatively differently adjusts luminance levels of the first through N^th middle status chrominance components according to degrees to which the first through N^th middle status chrominance components contribute to representing a single color of the image and outputs the first through N^th middle status chrominance components having the adjusted luminance levels as color-compensated first through N^th middle status chrominance components.

2. The multiple color transformation apparatus of claim 1, wherein the middle status chrominance component producer produces first through M^th middle status chrominance components by linearly combining the first through M^th input chrominance components and produces the first through N^th middle status chrominance components by linearly combining the first through M^th middle status chrominance components.

3. The multiple color transformation apparatus of claim 2, wherein the middle status chrominance component producer comprises:

a coefficient group determiner which determines a coefficient group; and

a middle status chrominance component generator which generates the first through N^th middle status chrominance components from the first through M^th input chrominance components using the determined coefficient group.

4. The multiple color transformation apparatus of claim 3, wherein the middle status chrominance component generator generates the first through M^th middle status chrominance components among the first through N^th middle status chrominance components according to:

$\left[\begin{array}{c}{\mathrm{CM}}_1\\ {\mathrm{CM}}_2\\ \mathrm{⋮<br><br>}\\ {\mathrm{CM}}_M\end{array}\right]={\mathrm{COEFF}}_1<br><br>\left[\begin{array}{c}{\mathrm{CI}}_1\\ {\mathrm{CI}}_2\\ \mathrm{⋮<br><br>}\\ {\mathrm{CI}}_M\end{array}\right]$

wherein Cl₁, Cl₂, . . . , and Cl_M denote the first through M^th input chrominance components, respectively, CM₁, CM₂, . . . , and CM_M denote the first through M^th middle status chrominance components, respectively, and COEFF₁ denotes a first one of the coefficient groups determined in the coefficient group determiner.

5. The multiple color transformation apparatus of claim 4, wherein the middle status chrominance component generator generates the (M+1)^th through N^th middle status chrominance components among the first through N^th middle status chrominance components according to:

$\left[\begin{array}{c}{\mathrm{CM}}_{M+1}\\ {\mathrm{CM}}_{M+2}\\ \mathrm{⋮<br><br>}\\ {\mathrm{CM}}_N\end{array}\right]={\mathrm{COEFF}}_2<br><br>\left[\begin{array}{c}{\mathrm{CI}}_1\\ {\mathrm{CI}}_2\\ \mathrm{⋮<br><br>}\\ {\mathrm{CI}}_M\end{array}\right]$

wherein CM_M+1, CM_M+2, . . . , and CM_N denote the (M+l)th through N^th middle status chrominance components, respectively, and COEFF₂ denotes a second one of the coefficient groups determined in the coefficient group determiner.

6. The multiple color transformation apparatus of claim 3, wherein the middle status chrominance component producer further comprises:

a scaling necessity checker which checks whether a user has requested scaling of at least one of the first through N^th middle status chrominance components and generates a check result;

a scaling ratio determiner which determines a scaling ratio in response to the generated check result of the scaling necessity checker; and

a scaler which scales at least one of the first through N^th middle status chrominance components using the determined scaling ratio in response to the check result of the scaling necessity checker.

7. The multiple color transformation apparatus of claim 6, wherein the scaling ratio determiner determines the scaling ratio to be complementary to a grayness of the first through M^th input chrominance components in response to the check result of the scaling necessity checker.

8. The multiple color transformation apparatus of claim 3, wherein the middle status chrominance component producer further comprises:

a scaling necessity checker which checks whether a user has requested scaling of at least one of the first through N^th middle status chrominance components and generates a check result; and

a scaling ratio determiner which determines a scaling ratio in response to the generated check result of the scaling necessity checker,

wherein the coefficient group determiner uses the scaling ratio in response to the check result of the scaling necessity checker to determine the coefficient group.

9. The multiple color transformation apparatus of claim 6, wherein the middle status chrominance component producer further comprises:

a threshold luminance level checker which checks whether at least one of luminance levels of the scaled first through N^th middle status chrominance components is outside of a substantial threshold luminance level; and

a threshold luminance level adjuster which adjusts the luminance levels of the scaled first through N^th middle status chrominance components, which are outside of the substantial threshold luminance level, to be within the threshold luminance level, in response to the check result from the threshold luminance level checker.

10. The multiple color transformation apparatus of claim 2, wherein the chrominance component compensator comprises:

a first luminance level checker which checks whether a luminance level of a selected one of the contribution chrominance components is lower than a first predetermined level and a luminance level of the single color is greater than the first predetermined level and generates a check result; and

a first luminance level adjuster which adjusts the luminance level of the selected contribution chrominance component in response to the check result of the first luminance level checker, the adjusted luminance level to adjust a luminance level of unselected ones of the contribution chrominance components,

wherein the selected contribution chrominance component corresponds to a one of the first through N^th middle status chrominance components which most greatly contributes to representing the single color and the unselected contribution chrominance components correspond to the first through N^th middle status chrominance components which are not the selected contribution chrominance component.

11. The multiple color transformation apparatus of claim 10, wherein the first predetermined level corresponds to a maximum luminance level of the selected contribution chrominance component.

12. The multiple color transformation apparatus of claim 10, wherein the chrominance component compensator further comprises:

a level generator which generates the first predetermined level using the luminance level of the selected contribution chrominance component, the luminance level of the single color, and a weight and outputs the generated first predetermined level to the first luminance level checker,

wherein the weight is a degree to which each of the first through N^th middle status chrominance components contributes to representing the single color.

13. The multiple color transformation apparatus of claim 12, wherein the level generator generates the first predetermined level according to:

$x_{\mathrm{th}}=\mathrm{Region}<br><br>\text{\hspace{1em}<br><br>}<br><br>\frac{D_{\mathrm{Yx}}}{D_{\mathrm{Yt}}}$

wherein x_th denotes the first predetermined level, Region denotes the weight, D_Yx denotes the luminance level of the selected contribution chrominance component, and D_Yt denotes the luminance level of the single color.

14. The multiple color transformation apparatus of claim 10, wherein the first luminance level adjuster comprises:

a greater chrominance component compensator which, if determined from the check result of the first luminance level checker that the luminance level of the selected contribution chrominance component is lower than the first predetermined level and the luminance level of the single color is greater than the first predetermined level, increases the luminance level of the selected contribution chrominance component to be equal to the first predetermined level and reduces the luminance level of the unselected contribution chrominance components by an amount of increase of the luminance level of the selected contribution chrominance component; and

a smaller chrominance component compensator which, if determined from the check result of the first luminance level checker that the luminance level of the selected contribution chrominance component is lower than the first predetermined level and the luminance level of the single color is less than or equal to the first predetermined level, increases or reduces the luminance level of the selected contribution chrominance component to be equal to the luminance level of the single color, and reduces or increases the luminance levels of the unselected contribution chrominance components by an amount of increase or decrease of the luminance level of the selected contribution chrominance component.

15. The multiple color transformation apparatus of claim 12, wherein the first luminance level adjuster adjusts the luminance levels of the unselected contribution chrominance components according to priorities of degrees to which the unselected contribution chrominance components contribute to representing the single color.

16. The multiple color transformation apparatus of claim 14, wherein when the luminance level of the selected contribution chrominance component is lower than the first predetermined level and the luminance level of the single color is greater than the first predetermined level, the greater chrominance component compensator adjusts the luminance levels of the selected and unselected contribution chrominance components according to:

$\mathrm{x2}=\mathrm{x1}+\left(\max -\mathrm{x1}\right)<br><br>\mathrm{Region}$ $\mathrm{y2}=\frac{\mathrm{y1}-\max \times <br><br>x_{\mathrm{th}}\times <br><br>\mathrm{Region}}{1-x_{\mathrm{th}}\times <br><br>\mathrm{Region}}$

wherein x2 denotes the adjusted luminance level of the selected contribution chrominance component, x1 denotes the unadjusted luminance level of the selected contribution chrominance component, y2 denotes the adjusted luminance levels of the unselected contribution chrominance components, y1 denotes unadjusted luminance levels of the unselected contribution chrominance components, x_th denotes the first predetermined level which is expressed as

$x_{\mathrm{th}}=\mathrm{Region}<br><br>\text{\hspace{1em}<br><br>}<br><br>\frac{D_{\mathrm{Yx}}}{D_{\mathrm{Yt}}}$

where D_Yx denotes the luminance level of the selected contribution chrominance component and D_Yt denotes the luminance level of the single color, max denotes a maximum luminance level of the middle status chrominance components and Region denotes a weight.

17. The multiple color transformation apparatus of claim 14, wherein when the luminance level of the selected contribution chrominance component is lower than the first predetermined level and the luminance level of the single color is less than or equal to the first predetermined level, the smaller chrominance component compensator adjusts the luminance levels of the selected and unselected contribution chrominance components according to:

$\mathrm{x2}=\frac{\mathrm{x1}+\mathrm{x1}\times <br><br>\left(1-x_{\mathrm{th}}\right)\times <br><br>\mathrm{Region}}{x_{\mathrm{th}}}$ $\mathrm{y2}=\mathrm{y1}-x_{\mathrm{th}}\times <br><br>x_2\times <br><br>\mathrm{Region}$

wherein x2 denotes the adjusted luminance level of the selected contribution chrominance component, x1 denotes the unadjusted luminance level of the selected contribution chrominance component, y2 denotes the adjusted luminance levels of the unselected contribution chrominance components, y1 denotes the unadjusted luminance levels of the unselected contribution chrominance components, x_th denotes the first predetermined level which is expressed as;

$x_{\mathrm{th}}=\mathrm{Region}<br><br>\text{\hspace{1em}<br><br>}<br><br>\frac{D_{\mathrm{Yx}}}{D_{\mathrm{Yt}}},$

where D_Yx denotes the luminance level of the selected contribution chrominance component and D_Yt denotes the luminance level of the single color, and Region denotes a weight.

18. The multiple color transformation apparatus of claim 2, further comprising:

a luminance component compensator which compensates the luminance levels of the color-compensated first through N^th middle status chrominance components by a difference between a luminance level of the single color to be represented by the color-compensated first through N^th middle status chrominance components and a compensation level.

19. The multiple color transformation apparatus of claim 18, wherein the luminance component compensator comprises:

a luminance level checker which checks whether the difference between the luminance level of the single color to be represented by the color-compensated first through N^th middle status chrominance components and the compensation level exists; and

a luminance level adjuster which adjusts the luminance levels of the color-compensated first through N^th middle status chrominance components in response to the checking of the luminance level checker.

20. The multiple color transformation apparatus of claim 19, wherein the compensation level corresponds to a luminance level of a color that is to be represented by the first through M^th input chrominance components.

21. The multiple color transformation apparatus of claim 19, wherein the compensation level is a luminance level that is pre-determined and is desired by a user.

22. The multiple color transformation apparatus of claim 19, wherein the luminance level checker checks, for each of the first through M^th input chrominance components, whether the difference between the luminance level of the single color and the compensation level exists according to:

dY _—

x[i]=sx[i]−

dy[i]

wherein, dy[i] denotes luminance levels of color-compensated middle status chrominance components corresponding to an i^th (1≦

i≦

M) input chrominance component of the color-compensated first through N^th middle status chrominance components, sx[i] denotes a luminance level of the i^th input chrominance component, and dY_x[i] denotes differences between the luminance level of the i^th input chrominance component and the luminance levels of the color-compensated middle status chrominance components corresponding to the i^th input chrominance component.

23. A multiple color transformation method for an image, comprising:

producing first through N^th middle status chrominance components by linearly combining first through M^th (where M is a positive integer greater than or equal to 3 and N is greater than or equal to M) input chrominance components for representing a color of each of pixels of the image; and

relatively differently adjusting luminance levels of the first through N^th middle status chrominance components according to degrees to which the first through N^th middle status chrominance components contribute to representing a single color of the image and determining the first through N^th middle status chrominance components having the adjusted luminance levels as color-compensated first through N^th middle status chrominance components.

24. The multiple color transformation method of claim 23, wherein the producing of the first through N^th middle status chrominance components comprises producing first through M^th middle status chrominance components by linearly combining the first through M^th input chrominance components and providing the first through N^th middle status chrominance components by linearly combining the first through M^th middle status chrominance components.

25. The multiple color transformation method of claim 24, further comprising:

compensating luminance levels of the color-compensated first through N^th middle status chrominance components by a difference between a luminance level of the single color to be represented by the color-compensated first through N^th middle status chrominance components and a compensation level.

26. A multiple color transformation apparatus for an image, comprising:

a middle status chrominance component producer which linearly combines first through M^th (where M is a positive integer greater than or equal to “

3”

) input chrominance components to represent a color of each of pixels of the image to produce first through N^th (where N is greater than or equal to M) middle status chrominance components; and

a luminance component compensator which compensates luminance levels of the first through N^th middle status chrominance components by a difference between a luminance level of a single color to be represented by the first through N^th middle status chrominance components and a compensation level.

27. The multiple color transformation apparatus of claim 26, further comprising a chrominance component compensator that relatively differently adjusts the compensated luminance levels of the first through N^th middle status chrominance components according to the degrees to which the luminance-compensated first through N^th middle status chrominance components contribute to representing the single color.

28. The multiple color transformation apparatus of claim 27, wherein the luminance component compensator comprises:

a luminance level checker which checks whether the difference between the luminance level of the single color to be represented by the first through N^th middle status chrominance components and the compensation level exists; and

a luminance level adjuster which adjusts the luminance levels of the first through N^th middle status chrominance components in response to the checking of the luminance level checker.

29. The multiple color transformation apparatus of claim 28, wherein the compensation level corresponds to a luminance level of a color which is to be represented by the first through M^th input chrominance components.

30. The multiple color transformation apparatus of claim 28, wherein the compensation level is a luminance level which is pre-determined and is desired by a user.

31. The multiple color transformation apparatus of claim 28, wherein the luminance level checker checks, for each of the first through M^th input chrominance components, whether the difference between the luminance level of the single color and the compensation level exists according to:

dY _—

x′

[i]=sx[i]−

dy′

[i

wherein, dy′

[i] denotes luminance levels of middle status chrominance components corresponding to an i^th (1≦

i≦

M) input chrominance component of the first through N^th middle status chrominance components, sx[i] denotes a luminance level of the i^th input chrominance component, and dY_x′

[i] denotes differences between the luminance level of the i^th input chrominance component and the luminance levels of the middle status chrominance components corresponding to the i^th input chrominance component.

32. A multiple color transformation method for an image, comprising:

linearly combining first through M^th (where M is a positive integer greater than or equal to “

3”

) input chrominance components for representing a color of each of pixels of the image to produce first through N^th (where N is greater than or equal to M) middle status chrominance components; and

compensating luminance levels of the first through N^th middle status chrominance components by a difference between a luminance level of a single color to be represented by the first through N^th middle status chrominance components and a compensation level.

33. The multiple color transformation method of claim 32, further comprising relatively differently adjusting the compensated luminance levels of the first through N^th middle status chrominance components according to degrees to which the luminance-compensated first through N^th middle status chrominance components contribute to representing the single color.

34. A computer readable recording medium having embodied thereon a computer program for a multiple color transformation method for an image, the method comprising:

producing first through N^th middle status chrominance components by linearly combining first through M^th (where M is a positive integer greater than or equal to 3 and N is greater than or equal to M) input chrominance components for representing a color of each of pixels of the image; and

relatively differently adjusting luminance levels of the first through N^th middle status chrominance components according to degrees to which the first through N^th middle status chrominance components contribute to representing a single color of the image and determining the first through N^th middle status chrominance components having the adjusted luminance levels as color-compensated first through N^th middle status chrominance components.

35. The computer readable recording medium of claim 34, wherein the producing of the first through N^th middle status chrominance components comprises producing first through M^th middle status chrominance components by linearly combining the first through M^th input chrominance components and providing the first through N^th middle status chrominance components by linearly combining the first through M^th middle status chrominance components.

36. The computer readable recording medium of claim 35, further comprising compensating luminance levels of the color-compensated first through N^th middle status chrominance components by a difference between a luminance level of the single color to be represented by the color-compensated first through N^th middle status chrominance components and a predetermined compensation level.

37. A computer readable recording medium having embodied thereon a computer program for a multiple color transformation method for an image, the method comprising:

linearly combining first through M^th (where M is a positive integer greater than or equal to “

3”

) input chrominance components for representing a color of each of pixels of the image to produce first through N^th (where N is greater than or equal to M) middle status chrominance components; and

compensating luminance levels of the first through N^th middle status chrominance components by a difference between a luminance level of a single color to be represented by the first through N^th middle status chrominance components and a compensation level.

38. The computer readable recording medium of claim 37, wherein the method further comprises relatively differently adjusting the compensated luminance levels of the first through N^th middle status chrominance components according to degrees to which the luminance-compensated first through N^th middle status chrominance components contribute to representing the single color.