Method and apparatus for bridging closely spaced moving zones in a television image and for differentially coding the bridging zones and the moving zones

摘要

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.