Lecture-8 - Lecture-8 Haralicks Edge Detector Haralicks...

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1 Lecture-8 Haralick’s Edge Detector Haralick’s Edge Detector • Fit a bi-quadratic polynomial to a small neighborhood of a pixel. • Compute analytically second and third directional derivatives in the direction of gradient. • If the second derivative is equal to zero, and the third derivative is negative, then that point is an edge point.
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2 Gradient angle, defined with positive x-axis: Homework Directional derivative Haralick’s Edge Detector Bi-cubic polynomial: Gradient angle, defined with positive y-axis: Haralick’s Edge Detector
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3 Haralick’s Edge Detector Homework Haralick’s Edge Detector
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4 Haralick’s Edge Detector First order polynomial 9 points give 9 eqs Haralick’s Edge Detector
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5 Computing coefficients using convolution
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6 Haralick’s Edge Detector Comparison of Three Edge Detectors • Marr-Hildreth – Gaussian filter – Zerocrossings in Laplacian • Canny – Gaussian filter – Maxima in gradient magnitude • Haralick – Smoothing through bi-cubic polynomial – Zerocrossings in the second directional derivative, and negative third derivative
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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-8 - Lecture-8 Haralicks Edge Detector Haralicks...

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