Two-Level Quantizer Design Using Genetic Algorithm
W. J. Chen, Shen‐Chuan Tai, Po-Jen Cheng · 1999
Introduction ConventionalBn ck Truncation Coding (Bgy [1] is a two-level non-parametric quantizer whose output levels are obtained bypreserving the first-order and secondorder moments of the input samples. An image is partitioned into many nxn blocks, and each block is encoded individually. For each pixel x i in the block, where i =1 to m(= nxn), the two output levels a and b from the quantizer for each block are computed b : a =x - # # q m- q (1) b =x +# # m- q q (2) where x: mean of the block, #: deviation of the block, q: the number of the pixels whose values are greater than or equal to x, and m: the total number of