21_thresholdx

21_thresholdx - Thresholding COMP344 COMP344 Thresholding...

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Unformatted text preview: Thresholding COMP344 COMP344 Thresholding Introduction Intensity histogram h ( i ): occurrences of pixel intensity value i e.g., h ( i = 3) = 100: there are 100 pixels having intensity value i = 3 For an image f ( x , y ) having light object and dark background , the histogram consists of two dominant modes (two groups on intensity values) Example ( T = 127) the object is extracted by selecting a threshold T that clearly separates these modes COMP344 Thresholding Example COMP344 Thresholding Multi-Level Thresholding (Multi-Class Labeling) multiple thresholds classify a point ( x , y ) as belonging to one object class if T 1 ≤ h ( x , y ) ≤ T 2 , ... COMP344 Thresholding Global vs Local/Adaptive Thresholding Global thresholding threshold does not depend on image locations or local features / neighboring pixel properties Local thresholding threshold depends on image locations or local features / neighboring pixel properties COMP344 Thresholding Global Thresholding Idea Partitioning the histogram into distinct regions by using a...
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This note was uploaded on 09/24/2010 for the course COMP 344 taught by Professor Albertk.wong during the Fall '09 term at HKUST.

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21_thresholdx - Thresholding COMP344 COMP344 Thresholding...

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