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13. Uniform color spaces - 2011

13. Uniform color spaces - 2011 - ECE 638 Principles of...

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ECE 638: Principles of Digital Color Imaging Systems Lecture 13: Uniform Color Spaces
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Synopsis
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Overall HVS model thus far is linear Psychometric function Question: Does Bag in right hand weigh more than Bag in left hand? Yes or No? 0.5 Threshold level stimulus Slope measure of sensitivity # of nickels in right hand when # of nickels in left hand is fixed Probit Analysis
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Weber’s Law Weber’s Law: Vision Source: D.E. Pearson, Transmission of Pictorial Information Stimulus Increment Total Stimulus constant Threshold for a difference is ~ Subject adjusts until they see a difference Luminance:
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Weber’s Law Application Quantization – space quantization levels non-uniformly as a function of luminance What does Weber’s law suggest: Integrating, we get Suggests that we should quantize L so that levels are farther apart as L increases Just perceivable difference in brightness constant Equal increments in brightness B correspond to logarithmically spaced increments in luminance L
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Weber’s Law Application (cont.)
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