Abstract: The process is characterized in that it performs: counting of the number of motion vectors, at least one component of which is greater than a predetermined value less than the maximum value, comparision of this number with at least one predetermined threshold, and in that the motion vector field is declared saturating if this number is greater than the predetermined threshold. Application relates to image interpolation.

Abstract: A method of detecting the reliability of a field of movement vectors of one image in a sequence of video images. The method includes a stage of calculating a stability parameter, Det_Stab(t), for the field. The parameter is based on a comparison (4), over two successive images, of the number of occurrences of the majority vectors of the movement-vectors fields of each of these images. A field is defined as stable if the variation in the number of occurrences lies within a predefined bracket. Reliability (7) is decided on the basis of this stability parameter.

Abstract: The invention relates to a device for pre-processing before encoding of a sequence of images including: means of storing the current frame and at least two preceding frames, means of defining a vicinity for each point of the current frame and for each corresponding point in the two preceding frames, means of measuring the motion of the current point relative to its position in the two preceding frames so as to detect whether the current point is in motion or in a static zone. According to the invention, the device includes: means of performing a spatial smoothing on the current point if the current point is in motion, means of performing a space-time smoothing if the current point is located in a static zone.

Abstract: The present invention relates to a device and a process for motion-compensated recursive filtering and a corresponding coding system. The device comprises in particular a blockwise motion estimation module [(2)], means [(3)] for determining a recursivity noise level (?rec), a module (4) for calculating a prediction error (?), a module [(5)] for calculating a recursivity coefficient (?) as a function of the recursivity noise level and of the prediction error, means [(6)] for calculating a motion-compensated image and means of filtering [(7, 8)] producing a weighting, by the recursivity coefficient, of the current input image and of a filtered and motion-compensated image stored previously.

Abstract: The process is characterized in that it performs:

Abstract: The present invention relates to a device and a process for motion-compensated recursive filtering and a corresponding coding system.

Abstract: The method includes a stage of calculating a stability parameter Det_Stab(t) for the field, on the basis of a comparison (4), over two successive images, of the number of occurrences of the majority vectors of the movement-vectors fields of each of these images, a field being defined as stable if the variation in the number of occurrences lies within a predefined bracket, and a stage of deciding on reliability (7) on the basis of this stability parameter.