Color correction apparatus and method

• US 20070139739A1
• Filed: 11/02/2006
• Published: 06/21/2007
• Est. Priority Date: 12/19/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Sung-su, Kim, Chang-yeong, Park, Du-sik
• Granted Patent: US 7,720,280 B2
• Time in Patent Office: Days
• US Class Current: 358/518
• CPC Class Codes: H04N 1/62 Retouching, i.e. modification of isolated colours only or in isolated picture areas only

Abstract

A color correction apparatus and method are provided. The color correction apparatus includes: a chromatic region determination module determining a first chromatic region to which an input pixel constituting an input image belongs and a second chromatic region neighboring the first chromatic region on a basis of specified chromatic region division information; a polynomial regression operation module performing polynomial regression on the first chromatic region and the second chromatic region; and a blending module providing corrected pixel information for the input pixel by giving weight values to results of the polynomial regression on the first chromatic region and the second chromatic region. The color correction method includes: determining the first and second chromatic regions; performing polynomial regression on the first and second chromatic regions; and providing corrected pixel information for the input pixel by giving weight values to results of the polynomial regression on the first and second chromatic regions.

Claims

1. A color correction apparatus comprising:

a chromatic region determination module which determines a first chromatic region to which an input pixel constituting an input image belongs and a second chromatic region neighboring the first chromatic region based on specified chromatic region division information;

a polynomial regression operation module which performs polynomial regression on the first chromatic region and the second chromatic region; and

a blending module which provides corrected pixel information for the input pixel by giving weight values to results of the polynomial regression on the first chromatic region and the second chromatic region.

2. The color correction apparatus of claim 1, wherein the second chromatic region comprises a chromatic region located at a shortest distance from the input pixel.

3. The color correction apparatus of claim 1, wherein the blending module:

determines a specified blending region;

calculates the weight values according to a position of the input pixel in the blending region, if the input pixel exists in the blending region; and

applies the calculated weight values to the results of the polynomial regression to provide corrected pixel information for the input pixel.

4. The color correction apparatus of claim 3, wherein the blending region is determined by a blending factor.

5. The color correction apparatus of claim 4, wherein the blending factor is expressed by “

b/a”

, in which “

a”

denotes a distance from a boundary line between the first chromatic region and the second chromatic region to the other boundary line of the first chromatic region, and

wherein “

b”

denotes a distance from the boundary line between the first chromatic region and the second chromatic region to a boundary line of the blending region within the first chromatic region.

6. The color correction apparatus of claim 4, wherein the blending factor comprises a ratio of the blending region to the first chromatic region.

7. The color correction apparatus of claim 1, wherein the blending module:

determines a specified blending region; and

applies the results of the polynomial regression on the first chromatic region to the input pixel, if the input pixel does not exist in the blending region, to provide corrected pixel information for the input pixel.

8. The color correction apparatus of claim 1, wherein the weight values are determined on a basis of a first distance from the input pixel to a blending line of the first chromatic region and a second distance from the input pixel to a blending line of the second chromatic region.

9. The color correction apparatus of claim 8, wherein the first and second distances are measured perpendicular to a boundary line between the first and second chromatic regions.

10. The color correction apparatus of claim 8, wherein the first distance is measure perpendicular to the blending line of the first chromatic region, and

wherein the second distance is measured perpendicular to the blending line of the second chromatic region.

11. The color correction apparatus of claim 1, further comprising:

a storage module storing the chromatic region division information.

12. A color correction method comprising:

determining a first chromatic region to which an input pixel constituting an input image belongs and a second chromatic region neighboring the first chromatic region based on specified chromatic region division information;

performing polynomial regression on the first chromatic region and the second chromatic region; and

providing corrected pixel information for the input pixel by giving weight values to results of the polynomial regression on the first chromatic region and the second chromatic region.

13. The color correction method of claim 12, wherein the second chromatic region comprises a chromatic region located at a shortest distance from the input pixel.

14. The color correction method of claim 12, wherein the providing the corrected pixel information comprises:

determining a specified blending region;

calculating the weight values according to a position of the input pixel in the blending region, if the input pixel exists in the blending region; and

applying the calculated weight values to the results of the polynomial regression to provide corrected pixel information for the input pixel.

15. The color correction method of claim 14, wherein the blending region is determined by a blending factor.

16. The color correction method of claim 15, wherein the blending factor is expressed by “

b/a”

, in which “

a”

denotes a distance from a boundary line between the first chromatic region and the second chromatic region to the other boundary line of the first chromatic region, and

wherein “

b”

denotes a distance from the boundary line between the first chromatic region and the second chromatic region to a boundary line of the blending region within the first chromatic region.

17. The color correction method of claim 15, wherein the blending factor comprises a ratio of the blending region to the first chromatic region.

18. The color correction method of claim 12, wherein the providing the corrected pixel information comprises:

applying the results of the polynomial regression on the first chromatic region to the input pixel after determining a specified blending region, if the input pixel does not exist in the blending region, to provide corrected pixel information for the input pixel.

19. The color correction method of claim 12, wherein the weight values are determined on a basis of a first distance from the input pixel to a blending line of the first chromatic region and a second distance from the input pixel to a blending line of the second chromatic region.

20. The color correction method of claim 19, wherein the first and second distances are measured perpendicular to a boundary line between the first and second chromatic regions.

21. The color correction method of claim 19, wherein the first distance is measured perpendicular to the blending line of the first chromatic region, and

wherein the second distance is measured perpendicular to the blending line of the second chromatic region.