Process for increasing the resolution and the visual quality of video streams exchanged between users of a video conference service

Process for increasing the resolution and the visual quality of video streams (1, 1 a, 1b, 1 c) that are exchanged between users connected through their terminals (2, 2a, 2b, 2c) to a video conference service, each user sending through his terminal (2, 2a, 2b, 2c) a video stream (1, 1 a, 1 b, 1 c) and receiving on his terminal (2a, 2b, 2c) video streams (5a, 5b, 5c) of at least one other user connected to said video conference service, a user further sending to a dictionary (8, 8b) through his terminal (2, 2c) at a given rate reference frames corresponding to snapshots of his video stream (1, 1 c) that are encoded with a resolution and a high visual quality, the resolution and the visual quality of said video stream being increased by means of a Super Resolution algorithm adapted to extract and use information from said reference frames to build an enhanced video stream (5, 5a, 5b, 5c) to be sent to other users connected to said service, said process providing for updating the rate for sending reference frames of a video stream (1, 1 c) upon detection of a variation in said video stream.