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Lecture-8-h

# Lecture-8-h - 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
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
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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Lecture-8-h - Lecture-8 Haralicks Edge Detector Haralicks...

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