Midterm review: Cameras Pinhole cameras Vanishing points, horizon line Perspective projection equation, weak perspective Lenses Human eye Sample question:

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Presentation transcript:

Midterm review: Cameras Pinhole cameras Vanishing points, horizon line Perspective projection equation, weak perspective Lenses Human eye Sample question: “What property must 3D lines have so that they converge to the same vanishing point in an image? Assume standard perspective projection.”

Midterm review: Filters Convolution Box filters, Gaussian filters, derivatives Separable filters Aliasing, Gaussian pyramids, template matching Sample question: “What does the following 3x3 linear filter compute when applied to an image?”

Midterm review: Edges and Corners Derivative of Gaussian, image gradients Edges at different scales Canny edge detector Harris corner detector Sample question: “Why is non-maximum suppression applied in the Canny edge detector?”

Midterm review: Texture Texture representation Laplacian pyramid, oriented pyramid Texture matching Texture synthesis (details of homework) Sample question: “Why does the top-most image in a Laplacian pyramid differ from the others?”

Midterm review: Stereo Vision Epipolar constraint, image rectification Ordering and brightness constancy constraints Normalization of image patches Window size Dynamic programming approach Sample question: “Under what conditions is the ordering constraint violated in stereo matching?”

Midterm review: Segmentation Gestalt properties Agglomerative clustering, dendrogram K-Means clustering (EM details not required) Background subtraction Sample question: “The simplest method for background subtraction is to just subtract the pixels in one frame from the previous one. Why do many systems instead try to build a model of the background from extended image sequences?”

Midterm review: Fitting a Model Hough transform RANSAC Inliers vs. outliers, iterative fitting Sample question: “Explain the factors that determine what size of bin to use in the Hough transform?”