Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-07-20
1990-01-30
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358106, 358336, H04N 594, H04N 713
Patent
active
048977241
ABSTRACT:
A device for reproducing digitally presented video pictures includes a restoration circuit for restoring erroneous picture elements. To this end a reference sub-picture is composed of erroneous and correct picture elements, the erroneous picture elements being entirely enclosed by the correct picture elements. Before restoring the erroneous picture elements, a correction function is determined, starting from the correct picture elements of the reference sub-picture, and by means of this correction function a correction value can be determined for each correct picture element in the reference sub-picture such that the difference picture elements obtained by subtracting the associated correction value from each correct picture element represent a signal whose mean value is zero. A known method of restoring erroneous picture elements can now be used for these difference picture elements.
REFERENCES:
patent: 4785349 (1988-11-01), Keith
patent: 4792851 (1988-12-01), Mochizuki
Scene Adaptive Coder, Wen-Hsiung Chen et al., IEEE Transaction on Communications, vol. Com-32, No. 3, Mar. 1984, pp. 225-232.
Chin Tommy P.
Marion Michael E.
U.S. Philips Corporation
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