发明名称 |
Image processing apparatus |
摘要 |
A quantizer scale value is detected with high accuracy. The number of effective samples of results of which DCT coefficients are quantized with each of quantizer scale values Q=1 to 31 is counted. In addition, fractional parts of quantized values are cumulated. When the number of effective samples of a cumulated value does not satisfy a predetermined value, the cumulated value is not used. When a dip point of a considered normalized cumulated value [q] quantized with the number of effective samples corresponding to each of the quantizer scale values Q clearly exists, using the relation between the normalized cumulated value [q] and normalized cumulated values [q-1] and [q+1] whose quantizer scale codes are immediately preceded and immediately followed by the quantizer scale code of the normalized cumulated value [q], it is determined whether or not the quantizer scale value Q corresponding to the normalized cumulated value [q] is a quantizer scale value Q used in the preceding encoding process.
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申请公布号 |
US2005163215(A1) |
申请公布日期 |
2005.07.28 |
申请号 |
US20050085345 |
申请日期 |
2005.03.21 |
申请人 |
SUGIYAMA AKIRA;KURAMURA IZUMI |
发明人 |
SUGIYAMA AKIRA;KURAMURA IZUMI |
分类号 |
H04N7/24;H04N7/26;H04N7/50;(IPC1-7):H04N7/12 |
主分类号 |
H04N7/24 |
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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