Image quality metrics and optimum focus criteria for visual optical systems

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Title: Image quality metrics and optimum focus criteria for visual optical systems
Author: Cheng, Xiaoxue
Abstract: Image quality metrics for visual instruments were examined in terms of their through focus behavior in the presence of various aberrations, and their correlations with available subjective performance data. The contrast sensitivity measurements were performed using rotationally symmetric, variable contrast difference-of-gaussians (DOG) targets, viewed through specially designed telescopes that presented various amounts of monochromatic aberrations. Then the contrast sensitivity ratios were correlated with the image quality metrics of the telescopes. The results show that an appropriately defined integral of the instrument-observer MTF (called MTFa) correlates well with subjective performance in most cases and predicts the optimum focus best; the radius that encircles 84% of the energy of the point spread function (called Rg4) gives good correlation in some cases including the DOG experiment
Record URI: http://hdl.handle.net/1850/13549
Date: 1996-11

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