Title:
METHOD AND APPARATUS FOR DE-QUANTIZATION OF TRANSFORM COEFFICIENTS, AND DECODING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/075810
Kind Code:
A1
Abstract:
A method for de-quantization of transform coefficients, comprising: determining, using classification information, the size of a unit to be processed corresponding to a first transform coefficient set, and then determining a quantization adjustment factor of the first transform coefficient set according to the size of the unit to be processed and a first preset algorithm, wherein the first preset algorithm enables the quantization adjustment factor to decrease as the size of the unit to be processed decreases; and performing de-quantization processing on transform coefficients in the first transform coefficient set using the quantization adjustment factor according to a second preset algorithm. On the basis of the method for de-quantization of transform coefficients, a decoding device adaptively determines a quantization adjustment factor of a first transform coefficient set according to the size of a unit to be processed, and then performs de-quantization processing on transform coefficients in the first transform coefficient set using the determined quantization adjustment factor. The encoding efficiency can be improved because no quantization step size adjustment information needs to be carried in the code stream transmitted by an encoding device. Also disclosed are a corresponding apparatus and a decoding device.
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Inventors:
ZHAO YIN (CN)
YANG HAITAO (CN)
YANG HAITAO (CN)
Application Number:
PCT/CN2015/094008
Publication Date:
May 11, 2017
Filing Date:
November 06, 2015
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04N19/124
Domestic Patent References:
| WO2013064109A1 | 2013-05-10 |
Foreign References:
| CN104702962A | 2015-06-10 | |||
| CN103517069A | 2014-01-15 | |||
| CN103975592A | 2014-08-06 |
Other References:
RICHARDSON, I.E.G.;: "Alternate Quantiser", H.264 AND MPEG-4 VIDEO COMPRESSION VIDEO CODING FOR NEXT-GENERATION MULTIMEDIA, 31 December 2003 (2003-12-31), pages 118, XP009504352
See also references of EP 3334160A4
See also references of EP 3334160A4
Attorney, Agent or Firm:
SHENPAT INTELLECTUAL PROPERTY AGENCY (CN)
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