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COL783: Digital Image Processing

Prem Kalra

[email protected]

h4p://www.cse.iitd.ac.in/~pkalra/col783

Department of Computer Science and Engineering

Indian InsEtute of Technology Delhi

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation: Recap

Boundary Features Detec0on Point, Fixed Oriented Lines

Edge: Gradient, LoG, DoG, Canny Hough Transform

Lines DetecEon Circle

Generalized Hough Transform

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Generalized Hough Transform

(GHT) DH Ballard, ‘Generalizing the Hough Transform to Detect Arbitrary Shapes’ Pa4ern RecogniEon, Vol 13, No 2, p 111, 1981.

(Source: Notes by Prof George Bebis)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Thresholding

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Thresholding

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Op0mal Thresholding

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Otsu Method

Based on minimizing the within class variance or maximizing between class variance.

Does not require knowledge of probability distribuEons

Works on bimodal histogram

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Otsu Method

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Region Based

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Region Growing

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Region SpliAng

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Image Segmentation

Region SpliAng

(Source: Gonzalez and Woods)

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Digital Image Processing http://www.cse.iitd.ac.in/~pkalra/col783

Color Image Processing

(Source: Gonzalez and Woods)

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Digital Image Processing

(Source: Gonzalez and Woods)

http://www.cse.iitd.ac.in/~pkalra/col783

Color Image Processing

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Digital Image Processing

(Source: Gonzalez and Woods)

http://www.cse.iitd.ac.in/~pkalra/col783

Color Image Processing

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Digital Image Processing

(Source: Gonzalez and Woods)

http://www.cse.iitd.ac.in/~pkalra/col783

Color Image Processing

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Digital Image Processing

(Source: Gonzalez and Woods)

http://www.cse.iitd.ac.in/~pkalra/col783

Color Image Processing

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Digital Image Processing

(Source: Gonzalez and Woods)

http://www.cse.iitd.ac.in/~pkalra/col783

Color Image Processing

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