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Image sampling of a continuous region by a discrete grid

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John
John 2014-5-8
I have a an image of an ellipse in the region [-3,3]X[-3,3] which was generated from a closed form function. I need to sample this image with a 256x256 or 257x257 grid, obtaining the values of the region [-3,3]X[-3,3] at each grid point. How to do this?

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