End Procedure Translate

With few exceptions, geometric transforms must be programmed to work "backward." Rather than converting original image coordinates into new image coordinates, you must set up the equations to find old-image coordinates for each new image pixel. The computed coordinates must be checked to insure that they lie inside the boundaries of the old image; and finally, the pixel value of the new image must be interpolated from the four pixels surrounding the non-integer old-image coordinates.

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