Video compression for limited bandwidth video data communication

摘要

In a time domain video compression and decompression system, difference frames obtained by subtracting pairs of consecutive frames in a time sequence of video frames are quantized to reduce the number of bits by coding the signals are transmitted. Offsets are added or subtracted from the signals in the difference frames for reducing truncation errors as a result of quantization. The dynamic range of the difference signals is reduced by clamping the maximum amplitudes of the difference signals to below certain predetermined values. Incomplete frames as well as complete frames are transmitted from the encoder to the decoder and the decoder ascertains the degree of completeness of the frames and decides whether to display or discard the incomplete frames based on how complete they are.