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Edge Detection. CSEP 576 Ali Farhadi. Edge. Attneave's Cat (1954) . Origin of edges. surface normal discontinuity. depth discontinuity. surface color discontinuity. illumination discontinuity. Edges are caused by a variety of factors. intensity function (along horizontal scanline).
Edge detection. You can find edges in images by subtracting adjacent pixel values: edges show up where they are different. Whether this works depends on how sharp the edges are. Printed letters are very, very sharp. Most stains are not.
02/02/12. Edge Detection. Computer Vision (CS 543 / ECE 549) University of Illinois Derek Hoiem. Magritte, “Decalcomania”. Many slides from Lana Lazebnik, Steve Seitz, David Forsyth, David Lowe, Fei-Fei Li. Last class. How to use filters for Matching Compression
Edge Detection. Our goal is to extract a “line drawing” representation from an image Useful for recognition: edges contain shape information invariance. Derivatives. Edges are locations with high image gradient or derivative Estimate derivative using finite difference Problem?. Smoothing.
Edge Detection. Today ’ s reading Cipolla & Gee on edge detection (available online) Szeliski, Ch 4.1.2, 4.1.3. From Sandlot Science. . Levels of reasoning in vision. Scenes. Objects. Lines. Edges. Pixels. Images. [Slide by Neeraj Kumar]. Levels of reasoning in vision. Scenes.
Edge detection. f(x,y) viewed as a smooth function not that simple!!! a continuous view, a discrete view, higher order lattice, … Taylor expand in a neighborhood f(x,y) = f(x0,y0)+ first order gradients + second-order Hessian + … Gradients are a vector (g_x,g_y) Hessian is a 2*2 matrix …
Edge Detection. 27 th Nov ember 2012 /. Edge Detection in Images. Goal: Automatically find the contour of objects in a scene. What For: Edges are significant descriptors, useful for classification, compression…. Edge Detection in Images. What is an object?
Edge detection. Goal: Identify sudden changes (discontinuities) in an image Intuitively, most semantic and shape information from the image can be encoded in the edges More compact than pixels Ideal: artist’s line drawing (but artist is also using object-level knowledge). Source: D. Lowe.
EDGE DETECTION. Edge Template Gradient Generation. Edge gradients are computed in two orthogonal directions, usually along rows and columns, the edge direction is inferred by computing the vector sum of the gradients.
Edge Detection. Phil Mlsna, Ph.D. Dept. of Electrical Engineering Northern Arizona University. Some Important Topics in Image Processing. Contrast enhancement Filtering (both spatial and frequency domains) Restoration Segmentation Image Compression etc. EE 460/560 course, Fall 2003