DATA COMPRESSION SYSTEM HAVING PERCEPTUALLY WEIGHTED MOTION VECTORS

A data compression system responsive to a preprocessed digitally encoded high definition video signal includes a discrete cosine transform, a frequency weighting filter, and an inverse discrete cosine transform circuit to provide a digitally encoded video signal within which the high frequency terms of the discrete cosine transform have been reduced. A motion compensated predictive coding data compression system organizes the current frame and a previous frame into a plurality of pixel blocks. The pixel blocks are compared by an error calculating and matching circuit under the influence of a timing control to provide an error value output. A spatial weighting factor is applied to each error value output to provide spatially weighted error values which are used to produce a corresponding plurality of motion vectors. The motion vector corresponding to the lowest weighted error value is selected by a motion vector selector for application to a channel buffer/encoder and eventual transmission.