An Improved Objective Method for Rating Picture Sharpness: CMT Acutance

R. G. Gendron

System Modulation Transfer (SMT) acutance has been calculated for photographic materials and reported with Modulation Transfer (MT) test results since its introduction in 1962. The reliability of this acutance index has recently been questioned. Two defects were found, neither of which was a serious problem when the SMT model was introduced. These defects become important in the presence of chemical adjacency effects. A proposed new model for acutance indices that avoids the defects in the SMT model has been evaluated. This Cascaded Modulation Transfer (CMT) acutance index correlates with visual experiments.

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Published
1973-12
Content type
Original Research
DOI
10.5594/J07642