Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-08-31
1992-06-16
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, H04N 713
Patent
active
051228777
ABSTRACT:
For the transmission of a digital video signal via a transmission medium (11) consecutive pictures of N.times.M picture elements are subsivided into sub-pictures, a sub-picture being asembled from n.times.m picture elements. The maximum value and the minimum value (U.sub.max, U.sub.min) of a video signal component associated with the picture elements in a sub-picture are determined. In addition, the amplitudes of a video signal component associated with the picture elements in the sub-picture are quantized with a given number of p bits, by means of subdividing the dynamic range (DR) of the video signal component within this sub-picture, into 2.sup.p equal sub-ranges. At the receiver end dequantization is effected in the following manner. On dequantization, a value which is equal to the said maximum value (U.sub.max) is assigned, for at least one of the picture elements in the sub-picture for which the signal component has the highest quantized amplitude (U.sub.Qmax), to this (those) picture element(s), but in the event that there are two more of those picture elements, not to all those picture elements. For at least one of the picture elements in the sub-picture for which the video signal has the lowest quantized amplitude (U.sub.Qmin), a value which is equal to the minimum value (U.sub.min) is assigned to this (those) picture element(s) on dequantization, but not to all those picture elements in the event that there are two or more of those picture elements.
REFERENCES:
patent: 4703352 (1987-10-01), Kondo
patent: 4710811 (1987-12-01), Kondo
patent: 4729021 (1988-03-01), Kondo
patent: 4802006 (1989-06-01), Kondo
patent: 4903124 (1991-02-01), Hoshi et al.
Goodman Edward W.
Oh Minsun
Shepperd John W.
U.S. Philips Corporation
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