Title:
DATA PROCESSING UNIT AND METHOD, MOVING IMAGE CODER AND METHOD AND MOVING IMAGE DECODER AND METHOD
Document Type and Number:
Japanese Patent JP3518717
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce quantization error without increasing data amount by allowing an inverse quantization means to apply inverse quantization to data in a quantization step of a size different from the case at quantization.
SOLUTION: An area 1 indicates a range that quantization error is smaller for inverse quantization by inverse quantization processing in a smaller quantization step, and an area 2 denotes a range that quantization error is smaller for inverse quantization by conventional inverse quantization processing conversely. When input data are almost smaller than data Q like a conversion coefficient with respect to a difference image, it is possible to reduce the quantization error as a whole by the inverse quantization processing in a smaller quantization step. That is, with respect to data where distribution is concentrated to smaller levels, data are decoded by using the smaller quantization step so as to reduce a quantization error without increasing a generated bit number.
Inventors:
Ogata, Masami
Application Number:
JP8625397A
Publication Date:
April 12, 2004
Filing Date:
April 04, 1997
Export Citation:
Assignee:
SONY CORP
International Classes:
H04N11/04; G06T9/00; H04N1/41; H04N9/804; H04N19/117; H04N19/126; H04N19/136; H04N19/176; H04N19/186; H04N19/196; H04N19/50; H04N19/503; H04N19/51; H04N19/60; H04N19/61; H04N19/625; H04N19/63; H04N19/86; H04N5/85; (IPC1-7): H04N11/04; H04N1/41; H04N7/30; H04N7/32
Attorney, Agent or Firm:
稲本 義雄
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