System and apparatus for inserting electronic watermark data

Details System and apparatus for inserting electronic watermark data System and apparatus for inserting electronic watermark data

2005-07-05

2005-07-05

Johns, Andrew W. (Department: 2621)

Image analysis

Applications

Reexamination Certificate

active

06915000

ABSTRACT:
The DCT converter103extracts block data102of a 8×8 pixel size from the original image101and then subjects it to DCT conversion. The quantizer104quantizes the DCT coefficient. The movement decision unit106obtains the difference between the number V(t) of DCT coefficients obtained by the DCT converter103and the number V(t−1) of DCT coefficients of the previous frame previously held. The movement decision unit106decides the movement as a large value if the difference exceeds a certain threshold value and decides the movement as a small value if the difference is less than the threshold value. The electronic watermark data inserter105extracts electronic watermark data W(j) which matches the location where 8×8 block data is extracted from the electronic watermark data table109, the picture type and the movement and then inserts it into the data after quantization output from the quantizer104.

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