METHOD OF PROCESSING VIDEO SIGNALS

• US 20150055702A1
• Filed: 03/06/2013
• Published: 02/26/2015
• Est. Priority Date: 03/06/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Heo, Jin, Jung, Jiwook, Yea, Sehoon, Koo, Moonmo, Kim, Taesup, Sung, Jaewon, Son, Eunyong
• Granted Patent: US 9,924,169 B2
• Time in Patent Office: Days
• US Class Current: 375/240.12
• CPC Class Codes: H04N 19/117 Filters, e.g. for pre-processing or post-processing sub-band filter banks H04N19/635
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/82 involving filtering within a prediction loop
• CPC Class Codes: H04N 21/816 involving special video data, e.g 3D video

Abstract

According to the present invention, a method of processing a video signal includes the steps of: receiving the depth data corresponding to a given block containing present pixels; determining a variation of the depth data; comparing the variation of the depth data with a predetermined value; if the variation is less than the predetermined value, coding the present pixels by using a first partial filter, and if the variation is greater than the predetermined value, coding the present pixels by using a second partial filter; wherein the second partial filter is applied to a wider range than the first partial filter. Accordingly the image quality of improved; the complexity according to the filter application is reduced; and at the same time variable filtering may improve the coding efficiency.

Claims

1. A method for processing a video signal, comprising:

receiving depth data corresponding to a predetermined block including a current pixel;

determining a variance of the depth data;

comparing the variance of the depth data with a predetermined value;

coding the current pixel using a first separable filter when the variance is less than the predetermined value; and

coding the current pixel using a second separable filter when the variance is greater than the predetermined value,

wherein the number of pixels used by the second separable filter differs from the number of pixels used by the first separable filter.

2. The method according to claim 1, wherein the first separable filter is applied to a predetermined number of pixels located on a horizontal line and a predetermined number of pixels located on a vertical line on the basis of the current pixel in the depth data.

3. The method according to claim 1, wherein the second separable filter is applied to a predetermined number of pixels located on a horizontal line, a predetermined number of pixels located on a vertical line and a predetermined number of pixels located in diagonal directions on the basis of the current pixel in the depth data.

4. The method according to claim 1, wherein a kernel size of the second separable filter is larger than a kernel size of the first separable filter.

5. The method according to claim 1, wherein the first separable filter and the second separable filter correspond to a bilateral filter and the numbers of pixels used by the first separable filter and the second separable filter are less than the number of pixels used by the bilateral filter.

9. The method according to claim 2, wherein the second separable filter is applied to a predetermined number of pixels located on a horizontal line, a predetermined number of pixels located on a vertical line and a predetermined number of pixels located in diagonal directions on the basis of the current pixel in the depth data.

10. The method according to claim 2, wherein a kernel size of the second separable filter is larger than a kernel size of the first separable filter.

11. The method according to claim 2, wherein the first separable filter and the second separable filter correspond to a bilateral filter and the numbers of pixels used by the first separable filter and the second separable filter are less than the number of pixels used by the bilateral filter.

6. A method for processing a video signal, comprising:

receiving depth data corresponding to a predetermined block including a current pixel;

determining a coding mode of the block;

determining a variance of the depth data;

comparing the variance of the depth data with a predetermined value;

determining a filtering method of the current pixel on the basis of the coding mode and a comparison result; and

filtering the current pixel on the basis of the determined filtering method.

7. The method according to claim 6, wherein the filtering method includes a first method of skipping filtering, a second method of applying a first separable filter, a third method of applying a second separable filter and a fourth method of applying an all-filter,

wherein the all-filter uses all pixels corresponding to a kernel size of the corresponding filter, the first separable filter and the second separable filter use only some of all pixels corresponding to the kernel size, and the number of pixels used for the second separable filter is greater than the number of pixels used for the first separable filter.

8. The method according to claim 7, wherein the all-filter corresponds to a bilateral filter and the first separable filter and the second separable filter use only some of pixels corresponding to the bilateral filter.