H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33
H04N 7/137 (1990.01)
Patent
CA 1323093
ABSTRACT OF THE DISCLOSURE 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 error energy can be achieved by low-pass filtering, the data regarding the additional processing of the motion compensated reconstructed image is transmitted to the receiver. In those instances, at the receiver, the method and apparatus determine from the filter selection data that filtering of a portion of a previously received image provides a lower error energy for the resulting prediction of the image. If a lower error energy is not achieved by low-pass filtering, the data from the communications path regarding the motion displacement enables the receiver to reconstruct at least a block portion of the image frame.
556037
Picturetel Corporation
Riches Mckenzie & Herbert Llp
LandOfFree
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