METHOD FOR VIDEO ENHANCEMENT AND COMPUTER DEVICE USING THE METHOD

• US 20100067815A1
• Filed: 03/11/2009
• Published: 03/18/2010
• Est. Priority Date: 09/18/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lee, Kual-Zheng
• Granted Patent: US 8,300,970 B2
• Time in Patent Office: Days
• US Class Current: 382/254
• CPC Class Codes: H04N 5/144 Movement detection for video coding H04N19/503; analysis of motion in general G06T7/20
• CPC Class Codes: H04N 9/646 for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Abstract

A video enhancement method is disclosed. An input image is retrieved and it is determined whether an enhancement mode is implemented to the input image. If so, motion detection is implemented to the input image that only enhancement coefficients of varied pixels of the input image are recalculated and the enhancement coefficients are updated to an enhancement coefficient table. Based on the enhancement coefficient table, pixel colors of the input image are adjusted and the adjusted image is output.

Claims

1. A method for video enhancement, comprising:

retrieving an input image;

determining whether a full enhancement mode or a fast enhancement mode is implemented to the input image;

implementing motion detection to the input image, if the fast enhancement mode is implemented, that only enhancement coefficients of varied pixels of the input image are recalculated and updating the enhancement coefficients to an enhancement coefficient table; and

adjusting pixel colors of the input image based on the enhancement coefficient table and outputting the adjusted image.

2. The method for video enhancement as claimed in claim 1, further comprising:

calculating the enhancement coefficients of all pixels of the input image if the full enhancement mode is performed; and

updating the enhancement coefficients to the enhancement coefficient table.

3. The method for video enhancement as claimed in claim 2, further comprising implementing a downscaling operation to the input image.

4. The method for video enhancement as claimed in claim 3, wherein the downscaling operation is performed by averaging, nearest neighboring, or interpolating.

5. The method for video enhancement as claimed in claim 1, wherein the determination of the enhancement mode further comprises:

setting a period parameter;

determining whether a count value for a counter is greater than or equal to the period parameter;

switching to the fast enhancement mode, if the count value is less than the period parameter, and accumulating the counter; and

outputting the enhancement mode.

6. The method for video enhancement as claimed in claim 5, wherein the full enhancement mode is performed whenever an image number corresponding to the period parameter is reached.

7. The method for video enhancement as claimed in claim 1, wherein stable pixels of the input image are determined using the motion detection to reduce calculation frequency of the enhancement coefficients.

8. The method for video enhancement as claimed in claim 7, wherein the motion detection further comprises:

detecting varied states of each pixel of the input image;

re-calculating and updating the enhancement coefficients of the varied pixels to the enhancement coefficient table;

continuing using the enhancement coefficients which are previously calculated of the stable pixels; and

periodically re-calculating the enhancement coefficients of each pixel of the input image.

9. A computer device, comprising:

a video capture module, retrieving an input image;

a determination module, determining whether a full enhancement mode or a fast enhancement mode is implemented to the input image;

a calculation module, implementing motion detection to the input image, if the fast enhancement mode is implemented, that only enhancement coefficients of varied pixels of the input image are recalculated and updating the enhancement coefficients to an enhancement coefficient table; and

an adjustment module, adjusting pixel colors of the input image based on the enhancement coefficient table and outputting the adjusted image.

10. The computer device as claimed in claim 9, wherein the calculation module calculates the enhancement coefficients of the whole pixels of the input image if the full enhancement mode is performed and updates the enhancement coefficients to the enhancement coefficient table.

11. The computer device as claimed in claim 10, further comprising a downscaling module, implementing a downscaling operation to the input image.

12. The computer device as claimed in claim 11, wherein the downscaling operation is performed by averaging, nearest neighboring, or interpolating.

13. The computer device as claimed in claim 9, wherein the determination module setting a period parameter, determining whether a count value for a counter is greater than or equal to the period parameter, switching to the fast enhancement mode, if the count value is less than the period parameter, and accumulating the counter, and outputting the enhancement mode.

14. The computer device as claimed in claim 13, wherein the determination module determines to perform the full enhancement mode whenever an image number corresponding to the period parameter is reached.

15. The computer device as claimed in claim 9, wherein the determination module determines stable pixels of the input image using the motion detection to reduce calculation frequency of the enhancement coefficients.

16. The computer device as claimed in claim 15, wherein the calculation module further detects varied states of each pixel of the input image, re-calculates and updating the enhancement coefficients of the varied pixels to the enhancement coefficient table, continues using the enhancement coefficients which are previously calculated of the stable pixels, and periodically re-calculates the enhancement coefficients of each pixel of the input image.

17. A computer-readable medium encoded with computer executable instructions for performing a method for video enhancement, the computer executable instructions comprising:

retrieved an input image;

determining whether a full enhancement mode or a fast enhancement is implemented to the input image;

implementing motion detection to the input image, if the fast enhancement mode is implemented, that only enhancement coefficients of varied pixels of the input image are recalculated and updating the enhancement coefficients to an enhancement coefficient table; and

adjusting pixel colors of the input image based on the enhancement coefficient table and outputting the adjusted image.

18. The computer-readable medium as claimed in claim 17, further comprising:

calculating the enhancement coefficients of all pixels of the input image if the full enhancement mode is performed; and

updating the enhancement coefficients to the enhancement coefficient table.

19. The computer-readable medium as claimed in claim 18, further comprising implementing a downscaling operation to the input image.

20. The computer-readable medium as claimed in claim 19, wherein the downscaling operation is performed by averaging, nearest neighboring, or interpolating.

21. The computer-readable medium as claimed in claim 17, wherein the determination of the enhancement mode further comprises:

setting a period parameter;

determining whether a count value for a counter is greater than or equal to the period parameter;

switching to the fast enhancement mode, if the count value is less than the period parameter, and accumulating the counter; and

outputting the enhancement mode.

22. The computer-readable medium as claimed in claim 21, wherein the full enhancement mode is performed whenever an image number corresponding to the period parameter is reached.

23. The computer-readable medium as claimed in claim 17, wherein stable pixels of the input image are determined using the motion detection to reduce calculation frequency of the enhancement coefficients.

24. The computer-readable medium as claimed in claim 23, wherein the motion detection further comprises:

detecting varied states of each pixel of the input image;

re-calculating and updating the enhancement coefficients of the varied pixels to the enhancement coefficient table;

continuing using the enhancement coefficients which are previously calculated of the stable pixels; and

periodically re-calculating the enhancement coefficients of each pixel of the input image.