METHOD AND APPARATUS FOR VIDEO DEINTERLACING AND FORMAT CONVERSION

• US 20080122975A1
• Filed: 02/04/2008
• Published: 05/29/2008
• Est. Priority Date: 12/23/2003
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: Linzer, Elliot N., Winger, Lowell L., Wells, Aaron G., Cote, Guy, Booth, Simon, Jia, Yunwei
• Granted Patent: US 7,659,939 B2
• Time in Patent Office: Days
• US Class Current: 348/448
• CPC Class Codes: H04N 7/012 Conversion between an interlaced and a progressive signal for graphics images G09G2310/0229

Abstract

A method for deinterlacing a picture is disclosed. The method generally includes the steps of (A) calculating a potential sample at a location interfaced with a first field of the picture by temporal filtering, (B) evaluating a protection condition in a current region around the location after inclusion of the potential sample and (C) calculating an interpolated sample at the location by vertical spatial filtering the first field in response to the protection condition indicating a significant increase in a vertical activity within the current region due to the potential sample.

Claims

1. A method for deinterlacing a picture, comprising the steps of:

(A) calculating a potential sample at a location interfaced with a first field of said picture by temporal filtering;

(B) evaluating a protection condition in a current region around said location after inclusion of said potential sample; and

(C) calculating an interpolated sample at said location by vertical spatial filtering said first field in response to said protection condition indicating a significant increase in a vertical activity within said current region due to said potential sample.

2. The method according to claim 1, further comprising the step of:

evaluating a similarity condition by comparing a plurality of first samples in said current region of said first field with a plurality of second samples in a co-located region in a second field of said picture.

3. The method according to claim 2, further comprising the step of:

calculating said interpolated sample at said location by said temporal filtering said first field with a third field of said picture where both (i) said similarity condition indicates that said current region approximately duplicates said co-located region and (ii) said protected condition indicates an insignificant change in said vertical activity within said current region.

4. The method according to claim 1, further comprising the step of:

evaluating said current region for a horizontal stationary edge.

5. The method according to claim 4, further comprising the step of:

calculating said interpolated sample at said location by said temporal filtering of said first field with a third field of said picture where said location is on a spatially stationary side of said horizontal stationary edge.

6. The method according to claim 4, wherein said interpolated sample is calculated by said vertical spatial filtering where said location is on a spatially dynamic side of said horizontal stationary edge.

7. The method according to claim 4, wherein said interpolated sample is calculated by said vertical spatial filtering where said horizontal stationary edge is not detected.

8. A method for deinterlacing a picture, comprising the steps of:

(A) calculating a potential sample at a location interfaced with a first field of said picture by temporal filtering;

(B) evaluating a protection condition in a current region around said location after inclusion of said potential sample; and

(C) calculating an interpolated sample at said location by blend filtering in response to said protection condition indicating a significant increase in a vertical activity within said current region due to said potential sample.

9. The method according to claim 8, further comprising the step of:

evaluating a similarity condition by comparing a plurality of first samples in said current region of said first field with a plurality of second samples in a co-located region in a second field of said picture.

10. The method according to claim 9, further comprising the step of:

calculating said interpolated sample at said location by said temporal filtering said first field with a third field of said picture where both (i) said similarity condition indicates that said current region approximately duplicates said co-located region and (ii) said protected condition indicates an insignificant change in said vertical activity within said current region.

11. The method according to claim 8, further comprising the step of:

evaluating said current region for a non-horizontal edge.

12. The method according to claim 11, further comprising the step of:

calculating said interpolated sample at said location by directional filtering said first field where said location is proximate said non-horizontal edge.

13. The method according to claim 11, further comprising the step of:

calculating said interpolated sample at said location by vertical spatial filtering said first field where said non-horizontal edge is not detected.

14. The method according to claim 13, wherein said blend filtering modifies said interpolated sample calculated by said vertical spatial filtering by blending with one of (i) a co-located sample and (ii) a motion compensated sample.

15. A method for deinterlacing a picture, comprising the steps of:

(A) calculating a potential sample at a location interfaced with a first field of said picture by temporal filtering;

(B) evaluating a protection condition in a current region around said location after inclusion of said potential sample; and

(C) calculating an interpolated sample at said location by directional filtering in response to said protection condition indicating a significant increase in a vertical activity within said current region due to said potential sample.

16. The method according to claim 15, further comprising the step of:

evaluating a similarity condition by comparing a plurality of first samples in said current region of said first field with a plurality of second samples in a co-located region in a second field of said picture.

17. The method according to claim 16, further comprising the step of:

calculating said interpolated sample at said location by said temporal filtering said first field with a third field of said picture where both (i) said similarity condition indicates that said current region approximately duplicates said co-located region and (ii) said protected condition indicates an insignificant change in said vertical activity within said current region.

18. The method according to claim 15, further comprising the step of:

evaluating said current region for a horizontal stationary edge.

19. The method according to claim 18, wherein said directional filtering is in further response to said horizontal edge not being detected.

20. The method according to claim 18, further comprising the step of:

evaluating said current region for a non-horizontal edge, wherein said directional filtering is performed along said non-horizontal edge.