System and method for inserting information in dct...

Details System and method for inserting information in dct... System and method for inserting information in dct...

G - Physics

06

T

G06T 9/00 (2006.01) H04N 1/41 (2006.01) H04N 5/30 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01)

Patent

CA 2312138

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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