Title:
画像符号化装置及び方法、並びに画像復号装置及び方法
Document Type and Number:
Japanese Patent JP3743384
Kind Code:
B2
Abstract:
According to the present invention, not only still images but also moving images can be compressed with high quality. In an image coding apparatus, a wavelet transform unit low-pass filters and high-pass filters an input image signal in the vertical and horizontal directions to hierarchically transform a low frequency component repetitively. In the case of an interlaced image, the wavelet transform unit further decomposes a subband including, for example, a horizontal low frequency component and a vertical high frequency component in consideration of the characteristics of the image signal. A code-block generation unit divides quantized coefficients into code-blocks each having a predetermined size. The code-block serves as a unit subjected to entropy coding. In the case of the interlaced image, each code-block is set to, for example, 32x32 so as to be smaller than each code-block of a progressive image.
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Inventors:
Takahiro Fukuhara
Kimura Seiji
Junya Araki
Kimura Seiji
Junya Araki
Application Number:
JP2002118516A
Publication Date:
February 08, 2006
Filing Date:
April 19, 2002
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H04N1/41; H04N11/04; G06T9/00; H03M7/30; H03M7/40; H04N19/117; H04N19/119; H04N19/122; H04N19/126; H04N19/132; H04N19/136; H04N19/146; H04N19/157; H04N19/172; H04N19/18; H04N19/186; H04N19/187; H04N19/196; H04N19/33; H04N19/34; H04N19/60; H04N19/635; H04N19/91
Domestic Patent References:
| JP10271504A | ||||
| JP6178280A | ||||
| JP2002034043A |
Attorney, Agent or Firm:
Akira Koike
Eiichi Tamura
Seiji Iga
Eiichi Tamura
Seiji Iga