Title:
IMAGE PROCESSING DEVICE AND METHOD AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2001/045385
Kind Code:
A1
Abstract:
An image processing device comprising a quantizing range calculating unit (33) for determining a range of difference values with occurrence frequencies larger than a specified one, a quantizing unit (35) for quantizing difference values within the range, an entropy encoding unit (37) for reversibly encoding at least quantized difference values and a compressed data creating unit (3c) for creating compressed data including encoded difference value data corresponding to encoded difference values, wherein difference values falling within the quantizing range only are quantized and at least quantized difference values are entropy-encoded and reversibly compressed. Since the above limited quantizing and encoding do not subject difference values outside the quantizing range to quantizing errors, compressed data are available that can restore still images far less in visual degradation than conventional ones while maintaining a comparatively high compression ratio.
Inventors:
TANAKA YASUHIRO (JP)
KOJIMA TADASHIGE (JP)
KOJIMA TADASHIGE (JP)
Application Number:
PCT/JP1999/007129
Publication Date:
June 21, 2001
Filing Date:
December 17, 1999
Export Citation:
Assignee:
INTERMEDIA INC (JP)
TANAKA YASUHIRO (JP)
KOJIMA TADASHIGE (JP)
TANAKA YASUHIRO (JP)
KOJIMA TADASHIGE (JP)
International Classes:
H04N1/41; H04N19/00; H04N19/124; H04N19/136; H04N19/137; H04N19/154; H04N19/176; H04N19/19; H04N19/196; H04N19/90; H04N19/91; (IPC1-7): H04N1/41; H03M7/30; H04N7/32
Foreign References:
| JPH1051775A | 1998-02-20 | |||
| JPH08275153A | 1996-10-18 | |||
| JPH05130433A | 1993-05-25 | |||
| JPH047989A | 1992-01-13 | |||
| JPH0326081A | 1991-02-04 | |||
| JPS6021899A | 1985-02-04 | |||
| JPS6096079A | 1985-05-29 | |||
| JPS62199171A | 1987-09-02 | |||
| JPH11331617A | 1999-11-30 |
Attorney, Agent or Firm:
Sugitani, Tsutomu (Nishitenma 1-chome Kita-ku Osaka-shi Osaka, JP)
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