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Edge detection Convert a 2D image into a set of curves Extracts salient features of the scene More compact than pixels Origin of edges Edges are caused by a variety of factors Images as functions Edges look like steep cliffs Characterizing edges An edge is a place of rapid change in the image intensity function Image derivatives How can we differentiate a digital image $F[x,y]$ Option 1: reconst..

1. What is an image? A grid (matrix) of intensity values (common to use one byte per value: 0 = black, 255 = white) Can think of a (grayscale) image as a function $f$ from $R^2$ to $R$ $f(x,y)$ gives the intensity at position (x,y) A digital image is a discrete (sampled, quantized) version of this function Image transformations As with any function, we can apply perators to an image Today we'll ..

What is computer vision? Why study computer vision? Course overview Images & Image filtering [time permitting] 1. What is computer vision? Goal of computer vision: percieve the story behind the picture Compute properties of the world 3D shape Names of people or objects What happened? Can computers match human perception? Yes and No (maninly no) computers can be better at 'easy' things humans are..