System for improving display resolution

• US 7,110,012 B2
• Filed: 05/27/2003
• Issued: 09/19/2006
• Est. Priority Date: 06/12/2000
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Daly, Scott J., Messing, Dean
• Primary Examiner(s): Osorio, Ricardo
• Application Number:
  US10/447,186
• Publication Number:
  US 20040061710A1
• Time in Patent Office: 1,211 Days
• Field of Search: 345/690, 345/698, 345/603, 345/604, 345/611, 345/616, 382/263, 382/275, 382/254, 348/450
• US Class Current: 345/698
• CPC Class Codes: G06T 3/4015 Image demosaicing, e.g. colour filter arrays [CFA] or Bayer patterns
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 3/2059 using error diffusion
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/28 for enhancement of character form, e.g. smoothing

Abstract

A system for improving the display resolution by the reduction of chromatic aliasing.

Claims

1. A method for re-sampling an image having at least three color channels having chromatic information and luminance information comprising the steps of:

(a) re-sampling said luminance information using a first re-sampling process and attenuating at least a portion of lower frequency chromatic information with respect to at least a portion of higher frequency chromatic information resulting from said re-sampling of said luminance information;

(b) re-sampling said chromatic information of said image using a second re-sampling process, at least one of;

(i) re-sampling of said luminance information is different than said re-sampling of said chromatic information; and

(ii) said second process processes pixels of said image in a manner different than said first process;

(c) combining said re-sampled luminance information, said re-sampled chromatic information, and at least a portion of said higher frequency chromatic information into a re-sampled image.

2. The method of claim 1 wherein said re-sampling of said luminance includes re-sampling.

3. The method of claim 1 wherein said attenuating is using a high pass filter.

4. The method of claim 1 wherein said re-sampling of said luminance information results in two chromatic channels, where each of said chromatic channels is attenuated in a different manner.

5. The method of claim 1 wherein said re-sampling of said luminance information is in accordance with a model based upon the human visual system.

6. The method of claim 1 wherein said re-sampling of said chromatic information includes re-sampling.

7. The method of claim 1 wherein said re-sampling of said luminance information of said image is performed in such a manner that chromatic aliasing is reduced from what it would have been had said re-sampling of said luminance information been re-sampled in the same manner as said re-sampling of said chromatic information.

8. The method of claim 1 wherein said re-sampling of said luminance information is performed on a luminance portion of said image free from substantial re-sampling of chromatic information of said image, while said re-sampling of said chromatic information is performed on a chromatic portion of said image free from substantial re-sampling of luminance information of said image.

9. A method for re-sampling an image having at least three color channels comprising the steps of:

(a) re-sampling luminance information of said image, wherein said luminance information is at least 60% of the luminance of said image; and

(b) attenuating at least a portion of lower frequency chromatic information with respect to at least a portion of higher frequency chromatic information resulting from said re-sampling of said luminance information.

10. The method of claim 9 wherein said re-sampling of said luminance includes pixel re-sampling.

11. The method of claim 9 wherein said attenuating is using a high pass filter.

12. The method of claim 9 wherein said re-sampling of said luminance information results in two chromatic channels, where each of said chromatic channels is attenuated in a different manner.

13. A method for re-sampling an image comprising a plurality of at least three channels, wherein a first one of said channels has a luminance component comprising at least 60% of the luminance of said image, wherein at least one of a second and third one of said channels has a color component;

(a) re-sampling said first channel of said image;

(b) attenuating at least a portion of lower frequency chromatic information with respect to at least a portion of higher frequency chromatic information resulting from said re-sampling of said first channel of said image; and

(c) re-sampling said second channel of said image.

14. The method of claim 13 wherein said luminance component comprises at least 70% of the luminance of said image.

15. The method of claim 13 wherein said luminance component comprises at least 80% of the luminance of said image.

16. The method of claim 13 wherein said luminance component comprises at least 90% of the luminance of said image.

17. The method of claim 13 wherein said plurality of channels are color difference channels.

18. A method for re-sampling an image having at least three color channels having chromatic information and luminance information comprising the steps of:

(a) re-sampling said luminance information using a first re-sampling process;

(b) re-sampling said chromatic information of said image using a second re-sampling process, at least one of;

(i) re-sampling of said luminance information is different than said re-sampling of said chromatic information; and

(ii) said second process processes pixels of said image in a manner different than said first process;

(c) attenuating at least a portion of lower frequency chromatic information with respect to at least a portion of higher frequency chromatic information that results from said re-sampling of said luminance information;

(d) combining said re-sampled luminance information, said re-sampled chromatic information, and at least a portion of said higher frequency chromatic information into a re-sampled image.

19. The method of claim 18 wherein said re-sampling of said luminance information is performed prior to said re-sampling of said chromatic information.

20. The method of claim 18 wherein said attenuating is using a high pass filter.

21. The method of claim 18 wherein said re-sampling of said luminance information results in two chromatic channels, where each of said chromatic channels is attenuated in a different manner.

22. The method of claim 18 wherein said re-sampling of said chromatic information includes pixel re-sampling.

23. The method of claim 18 wherein said re-sampling of said luminance information of said image is performed in such a manner that chromatic aliasing is reduced from what it would have been had said re-sampling of said luminance information been re-sampled in the same manner as said re-sampling of said chromatic information.

24. The method of claim 18 wherein said re-sampling of said luminance information is performed on a luminance portion of said image free from substantial re-sampling of chromatic information of said image, while said re-sampling of said chromatic information is performed on a chromatic portion of said image free from substantial re-sampling of luminance information of said image.

25. A method for re-sampling an image having at least three color channels comprising the steps of:

(a) re-sampling said image in a manner that the luminous information has a non-uniform sampling rate;

(b) filtering said re-sampled image in a manner that takes into account said non-uniform sampling rate in such a manner that reduces the chromatic artifacts of said image to less than it would have been had said non-uniform sampling been taken into account.

26. The method of claim 25 wherein said image has a luminance non-uniform sampling rate in the horizontal direction.

27. The method of claim 25 wherein said image has a luminance non-uniform sampling rate in the vertical direction.

28. The method of claim 25 wherein said image has a luminance non-uniform sampling rate in a diagonal direction.

29. The method of claim 25 wherein said filtering include a high pass filter of chromatic information.