This section describes the low-level high-optimized functions for image resampling. They can be used for resizing of images with arbitrary rational resizing factor. The functions use anti-aliasing filters in effective polyphase implementation.(The similar implementation is used in signal-processing multi-rate filters.)
For the perfect unshifted block-by-block or parallelized image data processing, the source and destination images are defined with respect to the high-resolution reference grid (see Figure Row-Oriented Resampling of an Image). Required borders around the source image may either be created manually by the user or automatically by the special flavor of the resampling function.
