02_histogramx

02_histogramx - Histogram Processing COMP344 COMP344...

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Unformatted text preview: Histogram Processing COMP344 COMP344 Histogram Processing Image Histogram Digital image with gray level [0 , L- 1] n k = number of pixels with k th gray level ( k = 0 , 1 , 2 , . . . , L- 1) N : total number of pixels r k : k th gray level p ( r k ) = n k / N : probability of occurrence of gray level r k COMP344 Histogram Processing Available in Almost Every Digital Camera COMP344 Histogram Processing Examples Dark image Bright image COMP344 Histogram Processing Examples... COMP344 Histogram Processing Examples... Low-contrast image High-contrast image COMP344 Histogram Processing Image Histogram Histograms are not unique No spatial information is captured COMP344 Histogram Processing Contrast Stretching Low-contrast image COMP344 Histogram Processing Contrast Compressing High-contrast image COMP344 Histogram Processing Histogram Equalization We want an image with equally many pixels at every gray level the output intensity approximately follows uniform distribution A flat histogram r m : number of gray levels N : number of pixels in the image...
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02_histogramx - Histogram Processing COMP344 COMP344...

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