Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-05-14
1987-03-17
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358136, H04N 713, H04N 1104
Patent
active
046511938
ABSTRACT:
The coding device for a television transmitter includes an addressing and coding circuit for coding the values of the luminance and/or chrominance signals of each image point in accordance with a first code when the corresponding points are located in moving zones and in accordance with a second code when the corresponding points are located in widened zones, the widened zones including non-moving points which are within a predetermined distance of moving points. A concatenation circuit forms a concatenated series of codes obtained in order to transmit said codes over the transmission channel by means of transmission circuits. A bridging circuit initiates coding of the luminance and/or chrominance values in accordance with the first and second codes. A moving detector is coupled through a first input to the output of an image memory and receives on a second input each current luminance and/or chrominance signal to be coded. The moving detector compares the value of each current signal with the value of the corresponding signal of the current point of the previous image stored in the image memory and initiates, by means of the bridging circuit and as a function of the comparison results obtained, the production of the first and second code sequence by the addressing and coding circuit.
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Wendt, "Schmalband-Codierung", Nachrichtentechniche Zeitschrift, vol. 30, No. 3, Mar. 1977, pp. 245-250.
Bostelmann, "Ein Codec fur Bildfernsprechsignale mit Subjektiv Optimiertem Bewegungsdetektor", Frequenz, vol. 33, No. 1, Jan. 1979, pp. 3-8.
Dennis, "Quantiser Selection for Interframe Differential Pulse Code Modulation of Television Pictures", Electronics Letters, vol. 15, No. 5, Mar. 1979, pp. 142-144.
Shepperd John W.
Thomson - CSF
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