Perceived image contrast and observer preference

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dc.contributor.advisor Montag, Ethan Calabria, Anthony 2012-05-23T15:21:16Z 2012-05-23T15:21:16Z 2000-07
dc.description.abstract A large-scale investigation into the perception of contrast in color images was performed. Experiments were performed to determine the influence of image lightness, chroma, and sharpness transforms on perceived image contrast and observer preference. The influence of lightness, chroma, and sharpness manipulations was investigated separately by independent soft-copy, paired-comparison tests of contrast perception and image preference. The perception of contrast between images of different transforms and different subject matter was also investigated as was the perception of image contrast relative to the most preferred image manipulation. In all, five experiments of contrast perception and four experiments of image preference were performed by at least thirtytwo observers each. Results of the lightness, chroma, and sharpness-contrast experiments indicate perceived image contrast is a function of multiple image characteristics as opposed to simply being a function of the dynamic range of image intensity. In the Lightness-Contrast Experiments, images of identical white and black points were scaled to have significant differences in contrast based on their manipulations from the original image. In the Chroma-Contrast Experiments, images of identical lightness channels were scaled to have significant differences in perceived contrast due to relative chroma amount. In the Sharpness-Contrast Experiments, images of identical white and black points were scaled to have significantly different levels of perceived contrast due to sharpness. In the Scale- Linking Experiment, it was found that images of the above manipulations could be scaled similarly for perceived contrast. All scales of perceived contrast and image preference were found to be image independent among pictorial images. Empirical modeling of perceived contrast indicates differences in perceived contrast can be quantified as a function of image colorimetry, independent of original scene information. en_US
dc.language.iso en_US en_US
dc.relation RIT Scholars content from RIT Digital Media Library has moved from to RIT Scholar Works, please update your feeds & links!
dc.subject Color contrast en_US
dc.subject Color imaging en_US
dc.subject Imaging science en_US
dc.subject Lightness en_US
dc.subject.lcc Z258 .C353 2002
dc.subject.lcsh Color printing--Quality control en_US
dc.subject.lcsh Image processing--Digital techniques en_US
dc.title Perceived image contrast and observer preference en_US
dc.type Thesis en_US College of Science en_US
dc.description.department Chester F. Carlson Center for Imaging Science en_US
dc.contributor.advisorChair Fairchild, Mark

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