Image Segmentation Algorithms

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Presentation transcript:

Image Segmentation Algorithms Otsu (1979) Fisher (1936) Kittler and Illingworth (1986) Vincent and Soille (1991) Besag, Chen, Dubes (1986, 1991)

Image Lenna and Its Histogram

Illustration of Bayes vs. ML (2)

Application to Image Segmentation

ICM Segmentation Algorithm 1. Given an image Y, initialize a labeling X 2. For t=1:mxn X(t)←g0 if Pr(X(t)=g0|XN(t),Y) > Pr(X(t)=g|XN(t),Y) for g,g0 3. Repeat step 2 until “convergence” (6 runs) 4. X is the required labeling Chaur-Chin Chen and Richard C. Dubes Environmental Studies and ICM Segmentation Algorithm, Journal of Information Science and Engineering, Vol. 6, 325-337, 1990.

Gonzalez vs. Otsu Segmentation

Image Segmentation: ICM vs. Otsu

Image Segmentation: ICM vs. Otsu

Image Segmentation: ICM vs. Otsu

Matlab Code for Segmentation Gonzalez (2002) graythresh(f) (M-file) Otsu