IMAGE CODING DEVICE, IMAGE DECODING DEVICE, CONTROL METHODS THEREFOR, AND PROGRAM

WIPO Patent Application WO/2020/003740

A1

The present invention makes it possible to perform efficient coding using multiple kinds of rectangular quantization matrices and suppress the code quantities of the quantization matrices themselves. To this end, an image coding device for coding an image comprises: a division unit which divides an image to be coded into any of preset multiple kinds of rectangular blocks; a generation unit which generates multiple kinds of quantization matrices respectively corresponding to the multiple kinds of rectangular blocks; a first coding unit which codes each of the quantization matrices generated by the generation unit in a scan order corresponding to the shape thereof; a quantization unit which frequency-converts an image of a noticed rectangular block obtained by the division unit, and quantizes an obtained conversion coefficient using a quantization matrix corresponding to the shape of the noticed rectangular block; a second coding unit which codes the quantized conversion coefficient obtained by the quantization unit; and an integration unit which integrates coded data obtained by the first coding unit and coded data obtained by the second coding unit.

JP6891325	Image coding method
JP2018532319	Limiting Escape Pixel Signaling Values in Palette Mode Video Coding
JP2820807	[Title of Invention] Image data coding method

SHIMA MASATO (JP)

PCT/JP2019/018257

January 02, 2020

May 07, 2019

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CANON KK (JP)

H04N19/126; H04N19/157; H04N19/176; H04N19/463

WO2012160890A1	2012-11-29
WO2005072312A2	2005-08-11
WO2013157825A1	2013-10-24
WO2013065259A1	2013-05-10
WO2013005386A1	2013-01-10

JP2013038758A

2013-02-21

OHTSUKA, Yasunori et al. (JP)

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