Digitale Bildinterpolationsvorrichtung mit einer Vielzahl von Interpolationskernen

摘要

An apparatus and method for performing two-dimensional interpolation of an input digital image (particularly X-ray images) includes a memory containing a set of exact coefficients which define at least one kernel for vertical interpolation and one kernel for horizontal interpolation. A set of exact coefficients is determined at each output pixel location based on: i) vertical spacing and horizontal spacing between rows of input pixel values ii) the predetermined vertical increment and horizontal increment between rows of output pixel locations iii) a desired method of vertical interpolation at each output pixel location, and iv) a desired method of horizontal interpolation at each output pixel location. The input digital image pixel values are interpolated by applying the exact coefficients to the series of spaced pixel values. The plurality of kernel types includes kernels for performing cubic convolution, linear, decimation and replication interpolation.