Image processing apparatus and method

Patent metadata

Field	Value
Publication number	US-10142634-B2
Application number	US-201715857291-A
Country	US
Kind code	B2
Filing date	Dec 28, 2017
Priority date	Jun 29, 2012
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

The present disclosure relates to an image processing device and a method capable of suppressing the reduction of an image quality due to encoding/decoding. The image processing device includes: a quantization unit that when orthogonal transform processing is skipped with respect to a current block, quantizes all components of the current block using one weighting coefficient and when the orthogonal transform processing is performed on the current block, quantizes each component of the current block using a quantization matrix; an encoding unit that encodes the coefficient of the current block which is quantized by the quantization unit; and a transmission unit that transmits the coded data of the current block which is obtained by being encoded by the encoding unit. The present disclosure can be applied to, for example, an image processing device.

First claim

The invention claimed is:

1. A device for decoding encoded data of an image, the device comprising:
circuitry configured to:
receive encoded data including a plurality of coefficients constituting a quantization matrix;
decode the received encoded data; and
inversely quantize an orthogonal transform skip block of the decoded data in which orthogonal transform processing is skipped, using a matrix with coefficients having the same values which are different from the quantization matrix constituted by the plurality of coefficients.

2. The device according to claim 1 , wherein the quantization matrix is 4×4.

3. The device according to claim 1 , wherein the circuitry is further configured to inversely quantize an orthogonal transform skip block having a block size of 4×4 using a weighting coefficient.

4. The device according to claim 1 , wherein the circuitry is further configured to receive skip enable information indicating whether or not to enable the skip of the orthogonal transform processing as a picture parameter set.

5. The device according to claim 1 , wherein the quantization matrix is a first quantization matrix, the circuitry is further configured to inversely quantize a non-orthogonal transform skip block in which orthogonal transform processing is performed, using a second quantization matrix different from the first quantization matrix.

6. The device according to claim 1 , wherein the circuitry is further configured to demodulate data obtained by performing inverse quantization and decoding the received encoded data.

7. The device according to claim 1 , wherein the circuitry is further configured to demultiplex data obtained by performing inverse quantization and decoding the data encoded with audio data.

8. The device according to claim 1 , wherein the circuitry is further configured to display an image of an object derived by decoding and inversely quantizing the orthogonal transform skip block of the decoded data.

9. The device according to claim 1 , wherein the circuitry is further configured to decode audio data.

10. The device according to claim 1 , wherein the circuitry is further configured to read out data on a storage medium, which is used to record data obtained by performing quantization and encoding.

11. An image processing method for decoding encoded data of an image, the image processing method comprising:
receiving encoded data including a plurality of coefficients constituting a quantization matrix;
decoding the received encoded data; and
inversely quantizing an orthogonal transform skip block of the decoded data in which orthogonal transform processing is skipped, using a matrix with coefficients having the same values which are different from the quantization matrix constituted by the plurality of coefficients.

12. The image processing method according to claim 11 , wherein the quantization matrix is 4×4.

13. The image processing method according to claim 11 , further comprising:
inversely quantizing an orthogonal transform skip block having a block size of 4×4 using a weighting coefficient.

14. The image processing method according to claim 11 , further comprising:
receiving skip enable information indicating whether or not to enable the skip of the orthogonal transform processing as a picture parameter set.

15. The image processing method according to claim 11 , wherein the quantization matrix is a first quantization matrix, further comprising:
inversely quantizing a non-orthogonal transform skip block in which orthogonal transform processing is performed, using a second quantization matrix different from the first quantization matrix.

16. The image processing method according to claim 11 , further comprising:
demodulating data obtained by performing inverse quantization and decoding the received encoded data.

17. The image processing method according to claim 11 , further comprising:
demultiplexing data obtained by performing inverse quantization and decoding the data encoded with audio data.

18. The image processing method according to claim 11 , further comprising:
displaying an image of an object derived by decoding and inversely quantizing the orthogonal transform skip block of the decoded data.

19. The image processing method according to claim 11 , further comprising:
decoding audio data.

20. The image processing method according to claim 11 , further comprising:
reading out data on a storage medium, which is used to record data obtained by performing quantization and encoding.

Assignees

• Sony Corp

Inventors

• Sato Kazushi
• Morigami Yoshitaka
• Lu Shuo

Classifications

• H04N19/12

  Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264 · CPC title

• H04N19/124 Primary

  Quantisation · CPC title

• H04N19/157

  Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter · CPC title

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title