IMAGE CODING METHOD AND IMAGE DECODING METHOD

WIPO Patent Application WO/2011/108240

A1

An image decoding method that is capable of alleviating declines in coding efficiency and subjective image quality, selects, by switching types of inverse orthogonal conversion according to a coded image, an inverse orthogonal conversion, between a first and a second inverse orthogonal conversion (S20), which is applied to the coded image; inverse quantizes the coded image (S21); carries out the inverse orthogonal conversion, selected by the switching, upon the inverse quantized coded image (S22); and generates a decoded image by adding a differential image generated by the inverse orthogonal conversion and a predict image corresponding to the coded image (S23). The subjective image quality of the decoded image generated using the first inverse orthogonal conversion is greater than the subjective image quality of the decoded image generated using the second inverse orthogonal conversion, and the second inverse orthogonal conversion has a higher conversion efficiency than the first inverse orthogonal conversion.

JP2000354169	IMAGE PROCESSING UNIT AND IMAGE PROCESSING METHOD
JP2820807	[Title of Invention] Image data coding method
JP3872119	IMAGE SIGNAL CODER AND IMAGE SIGNAL DECODER

SHIBAHARA YOUJI
TANIKAWA KYOKO
SASAI HISAO
NISHI TAKAHIRO

PCT/JP2011/001104

September 09, 2011

February 25, 2011

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PANASONIC CORP (JP)
SHIBAHARA YOUJI
TANIKAWA KYOKO
SASAI HISAO
NISHI TAKAHIRO

H04N7/30

WO2008157360A2	2008-12-24
WO2008131042A1	2008-10-30

JPH0217777A	1990-01-22
JP2003204550A	2003-07-18
JP2009272727A	2009-11-19
JP2002314428A	2002-10-25
JPH09200762A	1997-07-31

NII, Hiromori (JP)
New house Extensive 守 (JP)

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