DCT: Alternatives to quantization
From what I read there are certain quantisation matrices for different applications, Adobe Photoshop has like 15 or something. The idea is that although there are error based mathematical calculations for these matrices the best way to deduce a good quantisation matrix is by simply using a human eye (in the case of JPEGs)I haven't seen any quantisation matrices that don't follow the general trend of having heavy penalties(High number) on the lower right frequencies, although some images have a large high frequency coefficients the lower frequencies are generally larger.