A gray scale reduction method or apparatus reduces required memory capacity for storing gray scale as compared with conventional gray scale reduction methods. The gray scale reduction apparatus performs quantization error scattering of input gray level data of an input image. Data produced by the quantization...http://www.google.com.au/patents/US6133902?utm_source=gb-gplus-sharePatent US6133902 - Gray scale level reduction method, apparatus and integrated circuit, and computer readable medium storing gray scale reduction program
