Video flow active control by means of adaptive shifted foveal geometries

摘要

This paper presents a control mechanism for video transmission that relies on transmitting non-uniform resolution images dependeing on the delay of the communication channel. These images are built in an active way to keep the areas of interest of the image at the ighest resolution available. In order to shift the area of high resolution over the image and to achieve a data structure easy to process by using conventional algorithms, a shifted fovea multiresolution geometry of adaptive size is used. Besides, if delays are nevertheless too high, the different areas of resolution of the image can be transmitted at different rates. A functional system has been developed for corriodr surveillance with static cameras. Thests with real video images have proven that the method allows an amost constant rate of images per second as long as the channel is not collapsed.