Lanczos resampling - Wikipedia, the free encyclopedia
Lanczos resampling (aka Lanczos2 and Lanczos3) is the use of a windowed sinc function as a convolution kernel for image resampling. Currently it is one of the best digital image resizing kernels.
Optimizing Image Processing With vImage
vImage is Apple’s image processing framework. It includes high-level functions for image manipulation—convolutions, geometric transformations, histogram operations, morphological transformations, and alpha compositing—as well as utility functions for format conversions and other operations.