METHOD OF MULTI-VIEW VIDEO SEQUENCE CODING/DECODING BASED ON ADAPTIVE LOCAL CORRECTION OF ILLUMINATION OF REFERENCE FRAMES WITHOUT TRANSMISSION OF ADDITIONAL PARAMETERS (VARIANTS)

• US 20140010305A1
• Filed: 07/02/2013
• Published: 01/09/2014
• Est. Priority Date: 07/03/2012
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Mironovich, Kovliga Igor, Mikhailovich, Fartukov Alexey, Naumovich, Mishourovsky Mikhail, Sergeevich, Dubkov Mikhail
• Application Number:
  US13/933,477
• Publication Number:
  US 20140010305A1
• Time in Patent Office: Days
• US Class Current: 375/240.16
• CPC Class Codes: H04N 19/105 Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/56 Motion estimation with initialisation of the vector search, e.g. estimating a good candidate to initiate a search
• CPC Class Codes: H04N 19/57 Motion estimation characterised by a search window with variable size or shape
• CPC Class Codes: H04N 19/597 specially adapted for multi-view video sequence encoding

Abstract

There is provided a digital signal processing method which includes a method of adaptive local correction of illumination change of reference frame for multi-view video sequence encoding, comprising following stages: calculating a parameter of correction of illumination using pixels neighboring a currently decoded block and pixels neighboring a reference block; performing correction of illumination for the reference block using the parameter of correction of illumination; decoding the currently decoded block using the illumination-corrected reference.

Claims

1. The method for multi-view video sequences decoding comprises:

calculating a parameter of correction of illumination using pixels neighboring a currently decoded block and pixels neighboring a reference block;

performing correction of illumination for the reference block using the parameter of correction of illumination; and

decoding the currently decoded block using the illumination-corrected reference block.

2. The method of claim 1, wherein the calculating the parameter of correction of illumination comprising:

determining numerical relations between values of the pixels neighboring the currently decoded block and values of the pixels neighboring the reference block; and

determining the parameter of correction of illumination based on the numerical relations.

3. The method of claim 2, wherein the determining the numerical relations comprising:

calculating a first estimation value estD as

4. The method of claim 2, wherein the determining the parameter of correction of illumination comprising:

calculating the parameter of correction of illumination α

as

5. The method of claim 1, wherein the performing correction of illumination for the reference block comprising:

multiplying a value of each pixel of the reference block on the parameter of correction of illumination.

6. The method of claim 5, wherein the multiplying the value of each pixel of the reference block comprising:

calculating the illumination-corrected reference block as predPartALC_i[x, y]=Min(255, (predPart_i[x, y]*α

+2^{log WDC-1})>

>

log WDC), where predPart_i[x, y] is a value of a pixel at coordinate (x, y) of the reference block, predPartALC_i[x, y] is a illumination-corrected value of the pixel at coordinate (x, y) of the reference block, α

is the parameter of correction of illumination, and log WDC is an effective number coefficient.

7. The method of claim 1, wherein the pixels neighboring the currently decoded block are pixels which had been previously decoded.

8. The method of claim 1, further comprising:

determining the reference block corresponding to the currently decoded block using a displacement vector.

9. The method of claim 1, further comprising:

determining whether to use a correction of illumination scheme based on a flag generated by an encoder.

10. A non-transitory computer-readable medium comprising a program for instructing a computer to perform the method of claim 1.

11. The method for multi-view video sequences encoding comprises:

determining a reference block that is used for generating a currently encoded block;

calculating a parameter of correction of illumination using pixels neighboring the currently encoded block and pixels neighboring the reference block;

performing correction of illumination for the reference block using the parameter of correction of illumination; and

encoding the currently encoded block using the illumination-corrected reference block.

12. The method of claim 11, wherein the calculating the parameter of correction of illumination comprising:

determining numerical relations between values of the pixels neighboring the currently encoded block and values of the pixels neighboring the reference block; and

determining the parameter of correction of illumination based on the numerical relations.

13. The method of claim 12, wherein the determining the numerical relations comprising:

calculating a first estimation value estD as

14. The method of claim 12, wherein the determining the parameter of correction of illumination comprising:

calculating the parameter of correction of illumination α

as

15. The method of claim 11, wherein the performing correction of illumination for the reference block comprising:

multiplying a value of each pixel of the reference block on the parameter of correction of illumination.

16. The method of claim 15, wherein the multiplying the value of each pixel of the reference block comprising:

calculating the illumination-corrected reference block as predPartALC_i[x, y]=Min(255, (predPart_i[x, y]*α

+2^{log WDC-1})>

>

log WDC), where predPart_i[x, y] is a value of a pixel at coordinate (x, y) of the reference block, predPartALC_i[x, y] is a illumination-corrected value of the pixel at coordinate (x, y) of the reference block, α

is the parameter of correction of illumination, and log WDC is an effective number coefficient.

17. The method of claim 11, wherein the determining the reference block comprising:

determining a displacement vector indicating the reference block corresponding the currently encoded block based on a discrepancy of luminance between the currently encoded block and the reference block.

18. The method of claim 11, wherein the determining the reference block comprising:

calculating mean-removed SAD (sum of absolute differences) between the currently encoded block and a reference block candidate, over sub-blocks included in the currently encoded block;

calculating a mean discrepancy of luminance between the currently encoded block and the reference block candidate; and

determining a displacement vector indicating the reference block corresponding the currently encoded block using the mean-removed SAD and the mean discrepancy of luminance.

19. The method of claim 11, further comprising:

generating a flag indicating whether to use a correction of illumination scheme when a decoder decodes the currently encoded block.

20. A non-transitory computer-readable medium comprising a program for instructing a computer to perform the method of claim 11.