Method of encoding video data, video encoder performing the same and electronic system including the same

• US 10,448,027 B2
• Filed: 10/19/2016
• Issued: 10/15/2019
• Est. Priority Date: 11/16/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jun, Sung-Ho
• Primary Examiner(s): Atala, Jamie J
• Assistant Examiner(s): Nguyen, Kathleen V
• Application Number:
  US15/297,732
• Publication Number:
  US 20170142424A1
• Time in Patent Office: 1,091 Days
• Field of Search: 37524014
• CPC Class Codes: H04N 19/103 Selection of coding mode or of prediction mode
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/167 Position within a video image, e.g. region of interest [ROI]
• CPC Class Codes: H04N 19/17 the unit being an image region, e.g. an object
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/184 the unit being bits, e.g. of the compressed video stream

Abstract

In a method of encoding video data, an input picture is divided into a first picture corresponding to a region of interest (ROI) and a second picture corresponding to a non-region of interest (non-ROI). A third picture is generated by down-scaling the second picture. A quantization parameter for the ROI is determined based on the first picture. A quantization parameter for the non-ROI is determined based on the third picture. A compressed picture is generated by encoding the input picture based on the quantization parameter for the ROI and the quantization parameter for the non-ROI.

Claims

1. A method of encoding video data, the method comprising:

dividing an input picture into a first picture corresponding to a region of interest (ROI) and a second picture corresponding to a non-region of interest (non-ROI);

generating a third picture by down-scaling the second picture;

setting a quantization parameter for the ROI by subtracting an offset parameter from a reference parameter;

setting a quantization parameter for the non-ROI by adding the offset parameter to the reference parameter; and

generating a compressed picture by encoding the input picture based on the quantization parameter for the ROI and the quantization parameter for the non-ROI,

wherein a bit-depth of the third picture is lower than a bit-depth of the first picture, and the bit-depth of the third picture is lower than a bit-depth of the second picture,

wherein the non-ROI comprises a first non-ROI, and a second non-ROI having a degree-of-interest lower than a degree-of-interest of the first non-ROI,

wherein the generating the third picture comprises;

generating a first portion of the third picture by down-scaling a first portion of the second picture corresponding to the first non-ROI; and

generating a second portion of the third picture by down-scaling a second portion of the second picture corresponding to the second non-ROI, and

wherein a bit-depth of the second portion of the third picture is lower than a bit-depth of the first portion of the third picture.

2. The method of claim 1, wherein the quantization parameter for the ROI is smaller than the quantization parameter for the non-ROI.

3. The method of claim 2, wherein the ROI comprises a first ROI, and a second ROI having a degree-of-interest higher than a degree-of-interest of the first ROI,

wherein the determining the quantization parameter for the ROI comprises:

setting a quantization parameter for the first ROI by subtracting a first offset parameter from the reference parameter; and

setting a quantization parameter for the second ROI by subtracting a second offset parameter from the reference parameter, the second offset parameter being greater than the first offset parameter.

4. The method of claim 2, wherein

the determining the quantization parameter for the non-ROI comprises:

setting a quantization parameter for the first non-ROI by adding a first offset parameter to the reference parameter; and

setting a quantization parameter for the second non-ROI by adding a second offset parameter to the reference parameter, the second offset parameter being greater than the first offset parameter.

5. The method of claim 1, wherein the generating the compressed picture comprises:

generating a first transformed picture by performing a transformation based on the first picture;

generating a second transformed picture by performing the transformation based on the second picture;

quantizing the first transformed picture based on the quantization parameter for the ROI; and

quantizing the second transformed picture based on the quantization parameter for the non-ROI.

6. The method of claim 1, wherein the dividing the input picture into the first picture and the second picture comprises:

dividing the input picture into a plurality of picture blocks;

categorizing, based on ROI information, the plurality of picture blocks as first picture blocks corresponding to the ROI or second picture blocks corresponding to the non-ROI;

setting the first picture blocks as the first picture; and

setting the second picture blocks as the second picture.

7. A method of encoding video data, the method comprising:

dividing an input picture into a first picture corresponding to a region of interest (ROI) and a second picture corresponding to a non-region of interest (non-ROI);

generating a third picture by down-scaling the second picture;

generating a first reference picture by performing a prediction based on the first picture;

generating a second reference picture by performing the prediction based on the third picture; and

generating a compressed picture by encoding the input picture based on the first reference picture and the second reference picture,

wherein the non-ROI comprises a first non-ROI and a second non-ROI having a degree-of-interest lower than that of the first non-ROI,

wherein the generating the third picture comprises;

generating a first portion of the third picture by down-scaling a first portion of the second picture corresponding to the first non-ROI; and

generating a second portion of the third picture by down-scaling a second portion of the second picture corresponding to the second non-ROI,

wherein a bit-depth of the first portion of the third picture is higher than a bit-depth of the second portion of the third picture.

8. The method of claim 7, a bit-depth of the first picture is higher than a bit-depth of the third picture, and a bit-depth of the second picture is higher than the bit-depth of the third picture.

9. The method of claim 7, wherein the generating the first reference picture comprises:

performing at least one of an intra prediction and an inter prediction for the first picture; and

generating the first reference picture that corresponds to a result of the at least one of the intra prediction and the inter prediction for the first picture.

10. The method of claim 9, wherein the generating the second reference picture comprises:

performing at least one of the intra prediction and the inter prediction for the third picture; and

generating the second reference picture that corresponds to a result of the at least one of the intra prediction and the inter prediction for the third picture.

11. The method of claim 7, wherein the generating the compressed picture comprises:

generating a first residual picture by subtracting the first reference picture from the first picture;

generating a second residual picture by subtracting the second reference picture from the second picture;

transforming the first residual picture and the second residual picture into a first transformed picture and a second transformed picture, respectively; and

quantizing the first transformed picture and the second transformed picture.

12. The method of claim 11, wherein a quantization parameter for the first transformed picture is smaller than a quantization parameter for the second transformed picture.

13. A method of encoding video data, the method comprising:

dividing an input picture into a plurality of pictures comprising a first picture corresponding to a region of interest (ROI) and a second picture corresponding to a non-region of interest (non-ROI);

generating a third picture based on the second picture, the third picture having a bit-depth that is less than a bit-depth of the second picture; and

encoding the input picture based on the first picture and the third picture,

wherein the encoding the input picture comprises;

setting a first quantization parameter by subtracting an offset parameter from a reference parameter;

setting a second quantization parameter by adding the offset parameter to the reference parameter; and

generating a compressed picture by encoding the input picture based on the first quantization parameter and the second quantization parameter,

wherein a bit-depth of the third picture is lower than a bit-depth of the first picture, and the bit-depth of the third picture is lower than a bit-depth of the second picture,

wherein the non-ROI comprises a first non-ROI, and a second non-ROI having a degree-of-interest lower than a degree-of-interest of the first non-ROI,

wherein the generating the third picture comprises;

generating a first portion of the third picture by down-scaling a first portion of the second picture corresponding to the first non-ROI; and

generating a second portion of the third picture by down-scaling a second portion of the second picture corresponding to the second non-ROI, and

wherein a bit-depth of the second portion of the third picture is lower than a bit-depth of the first portion of the third picture.

14. The method of claim 13, wherein the encoding the input picture comprises

generating a first reference picture by performing a prediction based on the first picture;

generating a second reference picture by performing the prediction based on the third picture; and

generating the compressed picture by encoding the input picture based on the first reference picture and the second reference picture.