The (run, level) pairs in an original series are inspected to determine whether or not modification of the (run, level) pairs would produce a desirable decrease in a number of bits required for variable-length encoding of the series of (run, level) pairs, despite introduction of noise. If so, the (run,...http://www.google.co.uk/patents/US6968091?utm_source=gb-gplus-sharePatent US6968091 - Insertion of noise for reduction in the number of bits for variable-length coding of (run, level) pairs
