Patent ID: 7558322

Claim:
A method for further compressing a compressed data stream using a temporal wavelet compression unit, the method comprising: in a decompression unit, receiving a data stream that has been compressed using a first compression protocol; in the decompression unit, partially decompressing the data stream using the first compression protocol to obtain wavelet coefficients; in an exclusive-OR comparison unit, reducing temporal redundancy in the data stream using an exclusive-OR comparison protocol on the wavelet coefficients, where the exclusive-OR comparison protocol includes for each frame in the data stream that is not a key frame: determining whether to initialize a frequency band compression threshold, wherein the threshold is to indicate at what point wavelet frequency bands should be skipped, where the skipped frequency bands have already been compressed enough using the first compression protocol; and determining whether a first wavelet frequency band is within the threshold, and if so, performing a mathematical exclusive-OR operation on the wavelet data at a quantized wavelet coefficient layer across the first wavelet frequency band; and in a recompression unit, recompressing the data stream using the first compression protocol.