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L6+Notes - Barrett - CS450 Winter 2011 Lecture 6 Histogram...

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Unformatted text preview: Barrett - CS450 Winter 2011 Lecture 6 Histogram Processing Objectives : To understand the effect on histograms of increasing/decreasing brightness/contrast, and the theory behind Histogram Equalization and Histogram Stretching. 1. Effect of Gain and Offset on a histogram Gain =1, Offset = 0 Gain =1, Offset = 64 Gain =1, Offset = -64 Gain =-1, Offset = 256 Note spike Barrett - CS450 Winter 2011 Gain =2, Offset = -128 Gain = , Offset = - Nonlinear Gain, Zero Offset Nonlinear Gain, Zero Offset Note spike Note spikes Not bad! No clipping! Note spikes Barrett - CS450 Winter 2011 Gain =2, Offset = -128 Gain = , Offset = - Nonlinear Gain, Zero Offset Nonlinear Gain, Zero Offset Note spike Note spikes Not bad! No clipping! Note spikes Barrett - CS450 Winter 2011 2. Histogram Equalization Histogram Equalization (H.E.) used the image histogram, H(D), to create a new mapping function that distributes the gray levels uniformly over the displayable dynamic range....
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L6+Notes - Barrett - CS450 Winter 2011 Lecture 6 Histogram...

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