Graphics Gems III (IBM Version)

1.2

GENERAL FILTERED IMAGE RESCALING

Dale Schumacher,     St. Paul, Minnesota

Publisher Summary

A raster image can be considered a rectangular grid of samples of a continuous 2-D function f(x, y). Those samples are assumed to be the exact value of the continuous function at the given sample point. The ideal procedure for rescaling a raster image involves reconstructing the original continuous function and then resampling that function at a different rate. Sampling at a higher rate generates more samples and thus, a larger image. Sampling at a lower rate generates fewer samples and thus, a smaller image. The process of making an image larger is known by many names, including magnification, stretching, scaling up, interpolation, and upsampling. ...