sampling

sampling - CS148: Introduction to Computer Graphics and...

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Page 1 CS148: Introduction to Computer Graphics and Imaging Sampling and Aliasing CS148 Lecture 15 Pat Hanrahan, Winter 2009 Key Concepts Sampling Aliasing Nyquist frequency Filters and convolution Antialiasing
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Page 2 Sampling CS148 Lecture 15 Pat Hanrahan, Winter 2009 Image Generation = Sampling Rasterization is performed by testing whether a point is inside a triangle More generally, evaluate a function at a point for( int x = 0; x < xmax; x++ ) for( int y = 0; y < ymax; y++ ) I[x][y] = f( float(x), float(y)); Take a continuous function f and convert to set of samples I, a discrete representation of the func.
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Page 3 CS148 Lecture 15 Pat Hanrahan, Winter 2009 Zone Plate CS148 Lecture 15 Pat Hanrahan, Winter 2009 Zone Plate
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Page 4 Aliasing
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Page 11 Wagon Wheel Effect http://www.michaelbach.de/ot/mot_wagonWheel/ CS148 Lecture 15 Pat Hanrahan, Winter 2009 “Aliases” Two frequencies are indistinguishable
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Page 12 CS148 Lecture 15 Pat Hanrahan, Winter 2009 Nyquist Frequency
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This document was uploaded on 01/12/2010.

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sampling - CS148: Introduction to Computer Graphics and...

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