lecture09 - CAP5415 Computer Vision Spring 2003 Khurram...

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Unformatted text preview: CAP5415 Computer Vision Spring 2003 Khurram Hassan-Shafique Edge Detection in Images Finding the contour of objects in a scene Edge Detection in Images What is an object? It is one of the goals of computer vision to identify objects in scenes. Edge Detection in Images Edges have different sources. What is an Edge Lets define an edge to be a discontinuity in image intensity function. Edge Models Step Edge Ramp Edge Roof Edge Spike Edge Detecting Discontinuities Discontinuities in signal can be detected by computing the derivative of the signal. Differentiation and convolution Recall Now this is linear and shift invariant, so must be the result of a convolution. We could approximate this as (which is obviously a convolution with Kernel ; its not a very good way to do things, as we shall see) ( 29 ( 29 - + = x f x f x f lim ( 29 ( 29 x x f x f x f n - + 1 [ ] 1 1- Finite Difference in 2D ( 29 ( 29 ( 29 - + = y x f y x f x y x f , , lim ,...
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lecture09 - CAP5415 Computer Vision Spring 2003 Khurram...

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