Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-03-22
1991-07-02
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358138, 358141, H04N 712
Patent
active
050289993
ABSTRACT:
The source encoder for video pictures described includes a preprocessing unit (PP) which supplies block-sequentially the data of a video picture. The video picture is then transferred to an encoding unit (C) via a controllable switch (S). The encoding unit includes inter alia a picture store and a controllable quantizer; it is followed by a buffer store (PS). A control unit (K) supervises the buffer store (PS) and controls in dependence on the filling level thereof the controllable switch (S), the encoding unit (C) and the quantizer included therein. In order to obtain a good picture quality, measures have been taken to ensure that the control unit (K) additionally controls the quantizer in dependence on the time elapsed after the maximum filling level of the buffer store (PS) has been reached and/or in dependence on the actual value of the quantization stepsize, such that during the entire operation the value of the quantization stepsize only passes through adjacent values.
REFERENCES:
patent: 4517596 (1915-04-01), Suzuki
patent: 4580162 (1986-04-01), Mori
patent: 4706260 (1987-11-01), Fedele et al.
patent: 4725885 (1988-02-01), Gonzales et al.
Groody James J.
Kostak Victor R.
Rich Marianne R.
U.S. Philips Corp.
LandOfFree
Source encoder for video pictures having a quantizer whose steps does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Source encoder for video pictures having a quantizer whose steps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Source encoder for video pictures having a quantizer whose steps will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1251435