Image distribution apparatus, communication terminal...

Details Image distribution apparatus, communication terminal... Image distribution apparatus, communication terminal...

2006-10-31

2006-10-31

Wu, Jingge (Department: 2624)

Image analysis

Image compression or coding

Interframe coding

C382S233000, C382S250000, C382S251000, C382S252000, C375S240120

Reexamination Certificate

active

07130472

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.

REFERENCES:
patent: 5253057 (1993-10-01), Terui et al.
patent: 5898457 (1999-04-01), Nagao et al.
patent: 6304606 (2001-10-01), Murashita et al.
patent: 2001/0043744 (2001-11-01), Hieda
patent: 2002/0131494 (2002-09-01), Fukuda et al.

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