A block transform-based digital media codec has a signaling scheme and bitstream syntax to flexibly signal that truncation of less significant information bits of transform coefficients coded as an optional layer of the bitstream has been performed adaptively per region or tile of the image....http://www.google.com/patents/US8184710?utm_source=gb-gplus-sharePatent US8184710 - Adaptive truncation of transform coefficient data in a transform-based digital media codec
