Method and apparatus employing adaptive filtering for efficiently communicating image sequences

Abstract From the Canadian patent

A method and apparatus for encoding and transmitting and/or decoding and receiving a sequence of image frames employ selectively a measure of motion displacement for generating a motion compensated image and filter selection data. The motion compensated image together with an error signal, provides the receiver with full detail regarding the next frame of a sequence. In some instances, however, the motion displacement data is inaccurate for portions of the next image frame. In those instances, the method and apparatus of the transmitter determine whether filtering of a portion of the motion compensated image provides a lower error energy for the resulting prediction of the image. If a lower …