An estimate of the number of bits required to encode a block of transform coefficients at a specified quantization (Q) level is generated without performing the actual encoding. The transform coefficients and the specified Q level are used to generate indices to lookup tables that map to the number of...http://www.google.com/patents/US5926222?utm_source=gb-gplus-sharePatent US5926222 - Bitrate estimator for selecting quantization levels for image encoding
