Animated electronic image segmentation process according to the movement of image blocks, using a contour detection process

摘要

The field of the invention is that of the analysis and coding of electronic image sequences. The objective is to furnish such a process which determines the speed of displacement of the contour, in an image, and especially contours with translational displacement, intended to be inserted in an image-segmentation process allowing a compression of the image signal without psychovisual degradation of the reconstructed image. This objective is in particular achieved with the aid of a process of image segmentation into blocks with single speed of displacement vector, characterised in that it comprises a process (13) for detecting a contour in each of the said image blocks, and in that the said speed-representing vector allocated (17) to a block possessing a single predominant contour is the speed of displacement vector of the said contour. Advantageously, the speed representing vector is chosen from a set of n vectors, previously chosen (15) as being the most representative of the current image. A preferential application is to be found in TVHD image compression for transmission through MAC channel. IMAGE