Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-02-12
1989-01-10
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, H04N 704
Patent
active
047977426
ABSTRACT:
In an image transmitting system such that an image frame is divided into plural blocks and video signals are transformed block by block in accordance with an orthogonal transform method before coding and transmission of the transform coefficients, transform coefficients are coded, only when differences in transform coefficient between the preceding frame and the current frame are significant, to reduce the coding speed and therefore the video signal transmission speed. In addition, transform coefficients are weighted under consideration of human visual characteristics (the weighting is increased with decreasing order of transform coefficient). Further, when only differences in transform coefficient are coded and transmitted, it is possible to further reduce the transmission speed.
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Dachiku Kenshi
Sugiyama Fumio
Groody James J.
Kabushiki Kaisha Toshiba
Parker Michael D.
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