Image processing method and image processing system

• US 8,374,427 B2
• Filed: 06/09/2010
• Issued: 02/12/2013
• Est. Priority Date: 06/12/2009
• Status: Active Grant

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: Tsai, Chi Yi
• Primary Examiner(s): Park, Chan S
• Assistant Examiner(s): MOTSINGER, SEAN T
• Application Number:
  US12/797,158
• Publication Number:
  US 20100316289A1
• Time in Patent Office: 979 Days
• Field of Search: None
• US Class Current: 382/167
• CPC Class Codes: H04N 1/6005 with luminance or chrominance signals, e.g. LC1C2, HSL or YUV
• CPC Class Codes: H04N 1/6027 Correction or control of colour gradation or colour contrast H04N1/6058 takes precedence

Abstract

An image processing method and an image processing system adapted to processing image information with multiple process pixels are disclosed. The image processing method includes steps of: setting a group of parameters; establishing a luminance lookup table; establishing a chrominance-luminance lookup table; retrieving the image information; determining a format of the image information; and if the format of the image is a first format, utilizing the chrominance-luminance lookup table to generate an adjusted chrominance and a first adjusted luminance corresponding to one of the process pixels; if the format of the image is a second format, utilizing the chrominance-luminance lookup table and the luminance lookup table to generate an adjusted chrominance, a first adjusted luminance, and a second adjusted luminance corresponding to one of the process pixels.

Claims

1. An image processing method adapted to processing image information with multiple process pixels, the image processing method comprising the steps of:

setting a group of parameters and establishing a luminance lookup table (LUT);

establishing a chrominance-luminance LUT according to the parameters and the luminance LUT;

retrieving and determining a format of the image information; and

generating an adjusted chrominance and a first adjusted luminance corresponding to one of the process pixels using the chrominance-luminance lookup table if the format of the image is a first format, and generating an adjusted chrominance, a first adjusted luminance and a second adjusted luminance corresponding to one of the process pixels using the chrominance-luminance lookup table and the luminance lookup table if the format of the image is a second format.

2. The image processing method according to claim 1, wherein each process pixel having the first format includes a chrominance and a first luminance, and if the format of the image is the first format, the step of generating the adjusted chrominance and the first adjusted luminance using the chrominance-luminance lookup table comprises:

looking up the chrominance-luminance lookup table according to the chrominance and the first luminance corresponding to one of the process pixels; and

obtaining the adjusted chrominance corresponding to the chrominance and the first adjusted luminance corresponding to the first luminance in the chrominance-luminance lookup table.

3. The image processing method according to claim 2, wherein in the process pixels having the first format, two process pixels forms a macro pixel, and each macro pixel corresponds to two adjacent pixels of the image information.

4. The image processing method according to claim 2, wherein the first format is an YCbCr format of the color space and an YCbCr sampling ratio is 4:

2;

2.

5. The image processing method according to claim 1, wherein if the format of the image is the first format, the method further comprises the step of:

generating the adjusted chrominance and the first adjusted luminance corresponding to each process pixel via the chrominance-luminance lookup table until multiple process pixels of the image information are adjusted.

6. The image processing method according to claim 1, wherein each process pixel having the second format includes a chrominance, a first luminance and a second luminance, and the step of generating the adjusted chrominance, the first adjusted luminance and the second adjusted luminance using the chrominance-luminance lookup table and the luminance lookup table if the format of the image is the second format comprises:

looking up the chrominance-luminance lookup table according to the chrominance and the first luminance corresponding to one of the process pixels;

obtaining the adjusted chrominance corresponding to the chrominance and the first adjusted luminance corresponding to the first luminance in the chrominance-luminance lookup table;

looking up the luminance lookup table according to the second luminance corresponding to one of the process pixels; and

obtaining the second adjusted luminance corresponding to the second luminance from the luminance lookup table.

7. The image processing method according to claim 6, wherein in the process pixels having the second format, two process pixels form a macro pixel, and each of the macro pixels corresponds to four adjacent pixels of the image information.

8. The image processing method according to claim 6, wherein the second format is the YCbCr format of the color space and the YCbCr sampling ratio is 4:

2;

0 or 4;

1;

1.

9. The image processing method according to claim 1, wherein if the format of the image is the second format, the method further comprises the step of

generating the adjusted chrominance, the first adjusted luminance and the second adjusted luminance corresponding to each process pixel using the chrominance-luminance lookup table and the luminance lookup table until multiple process pixels of the image information are adjusted.

10. The image processing method according to claim 1, further comprising the steps of:

resetting the parameters;

reestablishing the luminance lookup table and the chrominance-luminance lookup table according to the reset parameters; and

adjusting the image information according to the reestablished luminance lookup table and the reestablished chrominance-luminance lookup table.

11. An image processing system comprising:

a memory module storing an image information, wherein the image information with multiple process pixels;

a calculating module electrically connected to the memory module, wherein the calculating module establishes a luminance lookup table according to a group of parameters, establishes a chrominance-luminance lookup table according to the parameters and the luminance lookup table and stores the luminance lookup table and the chrominance-luminance lookup table in the memory module; and

a processing module electrically connected to the memory module, wherein the processing module retrieves the image information from the memory module and determines the format of the image information, if the format of the image is a first format, the processing module uses the chrominance-luminance lookup table stored in the memory module to generate an adjusted chrominance and a first adjusted luminance corresponding to one of the process pixels, and if the format of the image is a second format, the processing module uses the chrominance-luminance lookup table and the luminance lookup table stored in the memory module to generated an adjusted chrominance, a first adjusted luminance and a second adjusted luminance corresponding to one of the process pixels.

12. The image processing system according to claim 11, wherein each process pixel having the first format includes a chrominance and a first luminance, the processing module looks up the chrominance-luminance lookup table according to the chrominance and the first luminance corresponding to one of the process pixels to obtain the adjusted chrominance corresponding to the chrominance and the first adjusted luminance corresponding to the first luminance in the chrominance-luminance lookup table.

13. The image processing system according to claim 12, wherein the first format is a YCbCr format of the color space and a sampling ratio is 4:

2;

2.

14. The image processing system according to claim 12, wherein the processing module uses the chrominance-luminance lookup table to generate the adjusted chrominance and the first adjusted luminance corresponding to each process pixel until the process pixels in the image information are adjusted by the processing module.

15. The image processing system according to claim 11, wherein each process pixel having the second format includes a chrominance, a first luminance and a second luminance, the processing module looks up the chrominance-luminance lookup table according to the chrominance and the first luminance corresponding to one of the process pixels, and obtains the adjusted chrominance corresponding to the chrominance, and the first adjusted luminance corresponding to the first luminance in the chrominance-luminance lookup table, and the processing module looks up the luminance lookup table according to the second luminance corresponding to one of the process pixels to obtain the second adjusted luminance corresponds to the second luminance in the luminance lookup table.

16. The image processing system according to claim 15, wherein the second format is a YCbCr format of the color space and a YCbCr sampling ratio is 4:

2;

0 or 4;

1;

1.

17. The image processing system according to claim 15, wherein the processing module uses the chrominance-luminance lookup table and the luminance lookup table to generate the adjusted chrominance, the first adjusted luminance and the second adjusted luminance corresponding to each of the process pixels until the process pixels of the image information are adjusted by the processing module.

18. The image processing system according to claim 11, further comprises:

an input module electrically connected to the calculating module, wherein the input module sets the parameters according to the operation of a user.

19. The image processing system according to claim 11, when the parameters are reset, the calculating module reestablishes the luminance lookup table and the chrominance-luminance lookup table according to the reset parameters and stores the luminance lookup table and the chrominance-luminance lookup table in the memory module, and the processing module uses the reestablished luminance lookup table and the reestablished chrominance-luminance lookup table to adjust the image information.