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Activity function for DCT coded images

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2 Author(s)
McLaren, D.L. ; Dept. of Electr. Eng. & Comput. Sci., Tasmania Univ., Hobart, Tas., Australia ; Nguyen, D.T.

By combining a measure of activity in transform-coded image blocks with frequency sensitivity data, suitable psychovisual coefficient quantisation step sizes can be calculated. A number of possible definitions for an activity function AF are proposed. The most suitable of these is determined by comparing results on a subjective basis.

Published in:

Electronics Letters  (Volume:25 ,  Issue: 25 )