Title:
IMAGE CODING DEVICE, IMAGE DECODING DEVICE, IMAGE CODING PROGRAM AND IMAGE DECODING PROGRAM
Document Type and Number:
WIPO Patent Application WO/2018/055712
Kind Code:
A1
Abstract:
A coefficient transform unit (111) performs a coefficient transform in each image region, thereby obtaining a transform coefficient in each image region. A brightness distribution extraction unit (121) generates brightness distribution information indicating the brightness of each image region. A correction coefficient determination unit (122) determines, in each image region, a correction coefficient on the basis of the brightness distribution information. A quantization width correction unit (123) corrects, in each image region, a quantization width using the correction coefficient of the image region, thereby obtaining a corrected quantization width in each image region. A scalar quantization unit (112) quantizes, in each image region, the transform coefficient of the image region using the corrected quantization width, thereby obtaining a quantized transform coefficient in each image region. An entropy coding unit (113) performs entropy coding on the quantized transform coefficient in each image region, thereby obtaining a coded transform coefficient in each image region.
Inventors:
HIRAKURI SHINYA (JP)
Application Number:
PCT/JP2016/077911
Publication Date:
March 29, 2018
Filing Date:
September 21, 2016
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H04N1/41
Foreign References:
| JPH0746596A | 1995-02-14 | |||
| JP2009010612A | 2009-01-15 | |||
| JP2010068269A | 2010-03-25 | |||
| JPH07115664A | 1995-05-02 | |||
| JP2014135551A | 2014-07-24 | |||
| JP2003319393A | 2003-11-07 |
Attorney, Agent or Firm:
MIZOI, Shoji et al. (JP)
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