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Lecture-7-h

Lecture-7-h - Lecture-7 Edge Detection LG Canny Edge...

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1 Lecture-7 Edge Detection: LG, Canny Edge Detection

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2 Edge Detectors Gradient operators: Sobel, Prewit, Robert Laplacian of Gaussian (Marr-Hildreth) Gradient of Gaussian (Canny) Facet Model Based Edge Detector (Haralick) Laplacian of Gaussian Edge Detector Generate a mask for LG for a given Apply mask to the image Detect zerocrossings – Scan along each row, record an edge point at the location of zerocrossing. – Repeat above step along each column s
3 Laplacian of Gaussian 2 2 2 2 ) ( ) , ( o y x e y x g + - = 2 2 2 2 ) ( 2 ) ( ) , ( o o y x e x y x g x + - - = 2 2 2 2 2 2 2 ) ( 2 2 ) ( 2 2 2 2 ) 1 ( ) )( ( ) , ( o o o o o y x y x e e x x y x g x + - + - - + - - = 2 2 2 2 ) ( 2 2 2 2 2 ) 1 ( 1 ) , ( o o o y x x y x g x + - - - = Laplacian of Gaussian 2 2 2 2 ) ( 2 2 2 2 2 ) 1 ( 1 ) , ( o o o y x xx e x y x g x g + - - - = = 2 2 2 2 ) ( 2 2 2 2 2 ) 1 ( 1 ) , ( o o o y x yy e y y x g y g + - - - = = 2 2 2 2 2 2 2 ) ( 2 2 2 2 ) ( 2 2 2 2 2 2 2 2 ) 1 ( 1 ) 1 ( 1 ) , ( ) , ( ) , ( o o o o o o y x y x e y e x y x g y y x g x y x g + - + - - - - - = + = D 2 2 2 2 ) ( 2 2 2 2 2 ) 2 ( 1 ) , ( o o o y x e y x y x g + - + - - = D

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4 Zerocrossings
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Lecture-7-h - Lecture-7 Edge Detection LG Canny Edge...

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