Patent ID: 7486731

Claim:
A system for video signal compression and decompression comprising: a compressor for receiving a video signal input at a bit resolution of P+Δ, where P and Δ are positive integers, subtracting a prediction signal, performing a transform on the result, the output of which transform being at a bit resolution of at least Q+Δ, where Q is the minimum number of bits required in the transform domain to represent a video signal at bit resolution P; quantizing the transformed signal to produce a quantized signal at a bit resolution of at least Q+Δ, utilizing the quantized signal to form the said prediction signal, and coding the quantized signal for delivery; a channel for delivering the coded signal; and a decompressor for receiving the coded signal, decoding the coded signal at a bit resolution of at least Q , inverse quantizing the decoded signal at a bit resolution of at least Q, performing the inverse of said transform on the inverse quantized signal, an output of the inverse transform being provided at a bit resolution of P+Δ.