Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-05-15
1993-10-12
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, H04N 713
Patent
active
052530590
ABSTRACT:
In accordance with the present invention, the number of bits used to code a frame of video is controlled by controlling the frame size. In a preprocessing stage (40) of a video coding circuit (10), each frame of video is processed by a low pass anti-aliasing filter (43,44) in the horizontal and vertical directions. The cutoff frequencies in the horizontal and vertical directions are determined by a desired frame reduction factor in the corresponding direction. Then to reduce the sampling rate in each dimension, each frame of video is processed horizontally and vertically by a shift varying filter (45,46). When the sampling rate in both the horizontal and vertical directions is reduced by M/N, the number of code bits decreases linearly with M/N.
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Ansari Rashid
Guillemot Christine M.
Bell Communications Research Inc.
Falk James W.
France Telecom and Telediffusion de France
Groody James J.
Harvey David E.
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