发明名称 |
System and method for inserting information in DCT coefficient domain |
摘要 |
A system for inserting an increased amount of information into DCT coefficients generated in blocks from image data is disclosed. Additional information is first inserted into input DCT coefficients in a block by changing at least one DCT coefficient of the input DCT coefficients to produce changed DCT coefficients. A level of one DCT coefficient selected from the changed DCT coefficients in the block is corrected to produce corrected DCT coefficients. The one DCT coefficient is selected so that a total code length of codes generated from the corrected DCT coefficients is equal to an original total code length of codes generated from the input DCT coefficients in the block.
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申请公布号 |
US2004179746(A1) |
申请公布日期 |
2004.09.16 |
申请号 |
US20040808754 |
申请日期 |
2004.03.25 |
申请人 |
NEC CORPORATION |
发明人 |
HASHIMOTO MASAHIRO |
分类号 |
G06T1/00;H03M7/30;H04N1/387;H04N7/08;H04N7/081;H04N7/26;H04N7/30;(IPC1-7):G06K9/36 |
主分类号 |
G06T1/00 |
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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