histogram.slides.printing.6

histogram.slides.printing.6 - Level Operations (Part 2)...

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Level Operations (Part 2) Level Operations (Part 2) CS 450: Introduction to Digital Signal and Image Processing Level Operations (Part 2) Histograms Histograms A histogram H ( r ) counts how many times each quantized value occurs. Example: Level Operations (Part 2) Histograms Histograms and Image Area Changing the size of the image shrinks or stretches the histogram vertically . Total area under the histogram = Total area of the image Level Operations (Part 2) Effect of Level Operations on Histograms Histograms and Brightness/Constrast I Adjusting brightness shifts the histogram horizontally . I Adjusting constrast causes the histogram to stretch or shrink horizontally : I Stretching = more contrast I Shrinking = less contrast Level Operations (Part 2) Effect of Level Operations on Histograms What’s Wrong with This Picture? Could you do this automatically? Level Operations (Part 2) Histogram Equalization Histogram Equalization I Can adjust contrast using linear operations or nonlinear
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histogram.slides.printing.6 - Level Operations (Part 2)...

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