发明名称 |
CODING RATE CONVERSION APPARATUS, CODING RATE CONVERSION METHOD, AND INTEGRATED CIRCUIT |
摘要 |
A plurality of macroblocks constituting coded data are inverse quantized using a first quantization matrix that is used when coding a picture, to obtain a plurality of sets of coefficient data. The first quantization matrix is converted to a second quantization matrix using a first conversion value and a second conversion value, where the first conversion value is for converting a low frequency coefficient corresponding to a frequency lower than a predetermined frequency among a plurality of coefficients shown by the first quantization matrix, and the second conversion value is for converting a high frequency coefficient among the plurality of coefficients and is larger than the first conversion value (Step S408). When the second quantization matrix is a matrix for increasing a coding rate of the coded data, a converted scale is calculated by multiplying a quantization scale corresponding to at least one macroblock byβ1 (≧1). At least one part of the plurality of sets of coefficient data is quantized using the second quantization matrix and a calculated converted scale that corresponds to a macroblock corresponding to the at least one part of the plurality of sets of coefficient data.
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申请公布号 |
US2010091842(A1) |
申请公布日期 |
2010.04.15 |
申请号 |
US20080519604 |
申请日期 |
2008.10.16 |
申请人 |
IKEDA HIROSHI;WADA YOSHIYUKI |
发明人 |
IKEDA HIROSHI;WADA YOSHIYUKI |
分类号 |
H04N7/26 |
主分类号 |
H04N7/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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