Centre National D'etudes Des Telecommunications

Marie-Jean Colaitis

Philippe Bernard

A method and installation are provided for broadcasting high definition television programs, particularly for broadcasting HD-MAC programs on a narrow channel, while reducing degradation of the picture when received by a first generation MAC receiver. The signal obtained by analysis of the source picture is subjected to spatio-temporal subsampling and to non-linear motion compensation filtering, leading to transmitting the points representative of the same source frame over at least two successive transmission frames (t1, t2) and transmitting, at the same time, assistance data defining a motion vector field. To improve the compatible frame delivered by a first generation receiver, the second analysis field corresponding to the same source frame is subjected to time attenuation in the direction of motion. Such attenuation depends on the movement vector and leads to assigning to each point of said parts an intermediate position between its position in the analyzed source frame and its anticipated position in the direction of movement.

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Cesson Sevigne, France

Marie-Jean Colaitis