Title:
符号化及び復号化装置ならびに符号化方法及び復号方法
Document Type and Number:
Japanese Patent JP4424522
Kind Code:
B2
Abstract:
To provide an encoding device capable of achieving a sufficient compression ratio even when using a prefix code such as a Huffman code as the entropy encoding method in the wavelet conversion encoding. All the components of LH, HL, HH sub-band coefficients of the same hierarchy and the same space coordinate are extracted as a set from a wavelet sub-band space. Furthermore, it is judged whether each component of each coefficient is zero and as 1-bit judgment result, the respective judgment results are combined to obtain multibit flag information. Upon encoding, firstly, the Huffman information is subjected to variable-length encoding by the Huffman encoding code. After this, only the coefficient values which are not zero are similarly subjected to the variable-length encoding by the Huffman code or the like and outputted.
Inventors:
Tour Takada
Application Number:
JP2008524848A
Publication Date:
March 03, 2010
Filing Date:
July 13, 2007
Export Citation:
Assignee:
NEC
International Classes:
H04N1/41; H03M7/30; H04N19/194; H04N19/60; H04N19/63; H04N19/91
Domestic Patent References:
| JP2004503964A | ||||
| JP5284368A | ||||
| JP1146372A |
Attorney, Agent or Firm:
Katsumi Utaka