Acutance And Granulance

Edward M. Crane

doi:10.1117/12.932859

28 December 1981 Acutance And Granulance

Edward M. Crane

Proceedings Volume 0310, Image Quality; (1981) https://doi.org/10.1117/12.932859
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

Abstract

"Acutance," an established concept, is an objective prediction of picture sharpness, which is subjective. "AMT acutance" is 100 + 66 log R, where R is the ratio of the area under the modulation transfer curve of a complete imaging system including a human eye to that under the eye curve alone, which is Gaussian with standard deviation 13 cycles per degree. AMT acutance 100 is excellent, 90 is good, 80 fair, and 70 just passable. We propose a new measure of acceptability so far as noise is concerned, on the same scale, to be called "granulance." It is based on the rms deviation, in 240-μm circular samples, from mean lightness in areas meant to be uniform. A tentative formula for granulance of a paper print is: minimum value of 100 - 40 log [650 x rmsL(film) x scene lightness x slope of the curve of paper lightness vs. scene lightness].

Citation Download Citation

Edward M. Crane "Acutance And Granulance", Proc. SPIE 0310, Image Quality, (28 December 1981); https://doi.org/10.1117/12.932859

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