lecture09 - 1 CAP5415 Computer Vision Spring 2003 Khurram...

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Unformatted text preview: 1 CAP5415 Computer Vision Spring 2003 Khurram Hassan-Shafique Edge Detection in Images & Finding the contour of objects in a scene 2 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. 3 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. 4 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 ; it’s not a very good way to do things, as we shall see) ( 29 ( 29 & ¡ ¢ £ ¤ ¥- + = ∂ ∂ → ε ε ε 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 & ¡ ¢ £ ¤ ¥- + = ∂ ∂ → ε ε ε y x...
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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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lecture09 - 1 CAP5415 Computer Vision Spring 2003 Khurram...

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