1. An automated method of generating a set of image processing instructions that identifies a region of picture elements for processing, said method comprising: receiving a first set of image processing instructions for performing a transform operation; for the first set of image processing instructions, producing a second set of image processing instructions that identify a region of picture elements for processing from an input image; and associating the second set of image processing instructions with the first set of image processing instructions, said association allowing the execution of the second set of image processing instructions at run-time to facilitate the execution of the first set of image processing instructions.