Lecture-7 - 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
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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 x y x g x g + - - - = = 2 2 2 2 ) ( 2 2 2 2 2 ) 1 ( 1 ) , ( o o o y x yy 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 y x y x g y y x g x y x g + - + - - - - - = + = 2 2
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This note was uploaded on 06/12/2011 for the course CAP 5415 taught by Professor Staff during the Fall '08 term at University of Central Florida.

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

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