Image analysis – Image compression or coding – Interframe coding
Reexamination Certificate
2008-06-04
2010-06-15
Ahmed, Samir A (Department: 2624)
Image analysis
Image compression or coding
Interframe coding
C382S232000, C382S233000, C382S250000, C382S251000, C375S240120
Reexamination Certificate
active
07738715
ABSTRACT:
An image distribution apparatus divides image data of a single frame into a plurality of blocks, orthogonally transforms the blocks and calculates transformation coefficients, quantizes the calculated transformation coefficients, codes the quantized transformation coefficients, and distributes the coded image data. The image distribution apparatus acquires the quantized transformation coefficients, stores the acquired transformation coefficients in a storage unit, calculates differences between the transformation coefficients of a first frame and the transformation coefficients of a second frame stored in the storage unit in a unit of block, counts blocks whose difference values calculated above are equal to or greater than a predetermined value as changing blocks of the first frame, and determines that the first frame has changed when the counted number of blocks is equal to or greater than a predetermined value.
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Iizuka Yoshio
Kawai Tomoaki
Ahmed Samir A
Bayat Ali
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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