lecture10 - 1 CAP5415 Computer Vision Spring 2003 Khurram...

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Unformatted text preview: 1 CAP5415 Computer Vision Spring 2003 Khurram Hassan-Shafique & Sobel Edge Detector Detecting Edges in Image Image I & & & --- 1 1 2 2 1 1 & & & --- 1 2 1 1 2 1 * * I dx d I dy d 2 2 + I dy d I dx d Threshold Edges 2 Sobel Edge Detector I dx d I dy d I Sobel Edge Detector I 2 2 & & + & = I dy d I dx d 100 = Threshold 3 Marr and Hildreth Edge Operator & Smooth by Gaussian & Use Laplacian to find derivatives I G S * = 2 2 2 2 2 1 y x e G +- = S y S x S 2 2 2 2 2 + = Marr and Hildreth Edge Operator ( 29 I G I G S * * 2 2 2 = = 2 2 2 2 2 2 2 3 2 2 2 1 y x e y x G +- & & +-- = 4 Marr and Hildreth Edge Operator 2 2 2 2 2 2 2 3 2 2 2 1 y x e y x G +- & & +-- = 0.0008 0.0066 0.0215 0.031 0.0215 0.0066 0.0008 0.0066 0.0438 0.0982 0.108 0.0982 0.0438 0.0066 0.0215 0.0982-0.242 0.0982 0.0215 0.031 0.108-0.242-0.7979-0.242 0.108 0.031 0.0215 0.0982-0.242-0....
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lecture10 - 1 CAP5415 Computer Vision Spring 2003 Khurram...

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