Image processing apparatus and method

Patent metadata

Field	Value
Publication number	US-9894362-B2
Application number	US-201314402777-A
Country	US
Kind code	B2
Filing date	Jun 21, 2013
Priority date	Jun 29, 2012
Publication date	Feb 13, 2018
Grant date	Feb 13, 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. An image processing device comprising:
circuitry configured to:
quantize an orthogonal transform skip block of image data, in which orthogonal transform processing is skipped based on a value of a transform skip flag using a quantization matrix with coefficients having the same values when the value of the transform skip flag is set to true, and
encode a coefficient of the orthogonal transform skip block quantized.

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

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

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

5. The image processing device according to claim 1 , wherein the quantization matrix is a first quantization matrix, the circuitry is further configured to 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 image processing device according to claim 1 , wherein the circuitry is further configured to modulate coded data obtained by performing quantization and encoding the image data to transmit the coded data as a transmission signal.

7. The image processing device according to claim 1 , wherein the circuitry is further configured to multiplex coded data obtained by performing quantization and encoding the image data with audio coded data.

8. The image processing device according to claim 1 , wherein the circuitry is further configured to capture an image of an object to generate the image data, and quantize the orthogonal transform skip block of the image data generated.

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

10. The image processing device according to claim 1 , wherein the circuitry is further configured to record coded data obtained by performing quantization and encoding the image data on a storage medium.

11. An image processing method comprising:
quantizing, by the circuitry, an orthogonal transform skip block of the image data, in which orthogonal transform processing is skipped, based on a value of a transform skip flag using a quantization matrix with coefficients having the same values when the value of the transform skip flag is set to true; and
encoding, by the circuitry, a coefficient of the quantized orthogonal transform skip block.

Assignees

• Sony Corp

Inventors

• Sato Kazushi
• Morigami Yoshitaka
• Lu Shuo

Classifications

• H04N19/176

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

• H04N19/70

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

• 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

• H04N19/157

  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

• H04N19/124 Primary

  Quantisation · CPC title