Image warping
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Image Warping is the process of digitally manipulating an image such that any shapes portrayed in the image have been significantly distorted.
These distortions can come from a variety of methods. The following list is not meant to be a partitioning of all available methods into categories.
- Images may be distorted through simulation of optical distortions (see also Image distortion or Aberration in optical systems)
- Images may be viewed as if they had been projected onto a curved or mirrored surface. (this can bee seen in renderings from the program POV-ray).
- Images may be viewed under a "particulate transformation" (either forward or reverse)
- Images can be partitioned into polygons and each polygon distorted.
- Images can be distorted using field morphing techniques.
There are at least two ways to generate an image using whatever chosen methods to distort.
- (forward-mapping) pixels (or their values) from the source image are projected to some destination no the destination image (This calculates the destination image by looking at each pixel of the source image).
- (reverse-mapping) each pixel of the destination image is caclulated by looking for some pixels in the source image. Instead of looking at every source image pixel, we look at every destination image pixel)
To estimate what kind of warping has taken place between consecutive images, one can use optical flow estimation techniques.
[edit] References
Feature-Based Image Metamorphosis. Siggraph '92. Thaddeus Beier
