Title:
HADAMARD TRANSFORMATION PROCESSING METHOD AND DEVICE
Document Type and Number:
Japanese Patent JP3902990
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a Hadamard transformation processing method and device with highly precise transformation coefficients.
SOLUTION: This Hadamard transformation processing method comprises a rounding processing part for rounding-up each least significant bit of the odd-numbered data among four transformed data outputted by carrying out transformation processing by a Hadamard transformation matrix to each input signal by four four-point Hadamard transformation processing parts, and for rounding-down each least significant bit of the residual odd-numbered data, and for integrating those data into integers. Also, this Hadamard transformation processing method comprises a rounding processing part for transforming the odd-numbered input signals by inputting signals obtained by rounding-up the outputs of loss-less four-point Hadamard transformation processing part which is the same number as the odd-numbered input signals, and for transforming the residual odd-numbered input signals by inputting signals obtained by rounding-down the residual outputs of the loss-less four-point Hadamard transformation processing part to each four-point Hadamard transformation processing part, and for rounding-up each least significant bit of the odd-numbered outputted transformed data, and for rounding-down each least significant bit of the residual odd-numbered data, and for integrating those data into integers.
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Inventors:
Tadayoshi Nakayama
Application Number:
JP2002193298A
Publication Date:
April 11, 2007
Filing Date:
July 02, 2002
Export Citation:
Assignee:
Canon Inc
International Classes:
G06F17/14; H03M7/30; H04N1/41; H04N19/60; (IPC1-7): G06F17/14; H03M7/30; H04N1/41; H04N7/30
Domestic Patent References:
| JP2003258645A | ||||
| JP2001128174A | ||||
| JP2002262293A | ||||
| JP1135266A |
Other References:
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ロスレスアダマール変換を応用したロスレス8点高速離散コサイン変換,信学技報,1999年
可逆離散コサイン変換とその画像情報圧縮への応用,映像情報メディア学会技報,1997年
Attorney, Agent or Firm:
Yasunori Otsuka
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura
Shiro Takayanagi
Yasuhiro Otsuka
Shuji Kimura