Method and installation for broadcasting compatible high-definition programmes

摘要

The method is usable in particular for the broadcasting of HD-MAC programmes. The source-image analysis signal is subjected to a space- time undersampling and to a nonlinear motion compensation filtering, leading to transmission over at least two successive transmission frames (t1, t2) of the points representing a same source image, and to transmission, at the same time as the image, of auxiliary data defining a motion vector field. To improve the compatible image furnished by a first generation receiver, the second analysis frame corresponding to a same source image is subjected to a temporal attenuation in the direction of the motion. This attenuation depends on the motion vector and leads to allocating to each point of the said parts a position (C) intermediate between its position (A) in the analysed source image and its anticipated position (B) in the direction of the motion. …IMAGE…