| C. R. Carlson and R. W. Cohen, "Visibility af displayed information," Off. Naval Res., Tech. Rep., Contr. N000l4-74-C-0184, 1978. |
....reflects the sensitivity of the human observer to contrast errors within the spatial frequency bands represented at that level. Humans are fairly sensitive t o contrast perturbations at low and medium spatial frequencies, but relatively insensitive to such perturbations at high spatial frequencies [3] , 4] 7] This increased observer sensitivity along with the increased data variance noted above means that more quantization levels must be used at high pyramid levels than at low levels. Fortunately, these pixels contribute little to the overall bit rate for the image, due to their low ....
C. R. Carlson and R. W. Cohen, "Visibility af displayed information," Off. Naval Res., Tech. Rep., Contr. N000l4-74-C-0184, 1978.
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