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Undistorting Color Images.

All camera lenses have distortions from the pinhole model they are designed to emulate. Fortunately, lens distortion is well studied, and free software exists to determine parameters that aid in undistorting an image [23]. We acquired several dozen photographs and performed the analysis, using the determined parameters to resample the images into an undistorted form. This is necessary, as the distortion placed some pixels 30 pixels away from their ideal pinhole position.

Lars S. Nyland