M+Rodriguez

[|Maira Rodriguez]

\warp"ing\, n.
 * warping**
 * //1.//** the act or process of one who, or that which, warps.
 * //2.//** the art or occupation of preparing warp or webs for the weaver. raig.

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Warping takes the //original image// (a two-dimensional array) and generates a //warped image// (another two-dimensional array). This is done by looping through each pixel in the warped image and asking: What is the proper pixel value that should be placed here? Given the particular row and column being calculated in the warped image, there is a corresponding row and column in the original image. The pixel value from the original image is transferred to the warped image to carry out the algorithm. In the jargon of image processing, the row and column that the pixel //comes from// in the original image is called the comes-from address. Transferring each pixel from the original to the warped image is the easy part. The hard part is calculating the //comes-from address// associated with each pixel in the warped image. This is usually a pure math problem, and can become quite involved. Simply stretching the image in the horizontal or vertical direction is easier, involving only a multiplication of the row and/or column number to find the comes-from address.

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