Rectification is useful to remove spatial distortions. Variations in illumination and viewing geometry between images can be corrected on images with no spatial reference. Distortion can be corrected and feature recognition enhanced by this process. Before you can compare differences between images you have to make sure that they properly align to each other. Rectification will allow this proper alignment to occur.
Pitfalls include the poor resolution if control points are not placed accurately. It is sometimes difficult to recognize features to properly place the control points. The distortion can be made worse if not applied correctly.
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