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Note for Digital Image Processing - DIP By Vj singh

  • Digital Image Processing - DIP
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Vj Singh
Vj Singh
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Histogram Processing Histogram: It is a plot of frequency of occurrence of an event. freq. of occurrence 0 1 2 3 event

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Histogram Processing  Histogram of images provide a global description of their appearance.  Enormous information is obtained.  It is a spatial domain technique.  Histogram of an image represents relative frequency of occurrence of various gray levels.  Histogram can be plotted in two ways:

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Histogram Processing  First Method:  X-axis has gray levels & Y-axis has No. of pixels in each gray levels. Gray Level 0 1 2 3 4 5 6 No. of Pixels (nk) 40 20 10 15 10 3 2 nk 40 30 20 10 0 1 2 3 Gray Levels 4 5 6

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Histogram Processing  Second Method:  X-axis has gray levels & Y-axis has probability of occurrence of gray levels. P(µk) = nk / n; where, µk – gray level nk – no. of pixels in kth gray level n – total number of pixels in an image Prob. Of Occurrence 1 Gray Level No. of Pixels (nk) 0 40 1 20 2 10 3 15 4 10 5 3 6 2 n = 100 P(µk) 0.4 0.2 0.1 0.15 0.1 0.03 0.02 1 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1 2 3 4 5 6 µk

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