im_stretch3 - stretch horizontally by 3%, displace sub-pixel mask
int im_stretch3( in, out, xdisp, ydisp )
IMAGE *in, *out;
double xdisp, ydisp;
im_stretch3() stretches the input image by 3% horizontally, and
displaces it by xdisp/ydisp. It uses bi-cubic interpolation, but runs
quickly. It works only for unsigned short images.
This function is part of the MARC acquisition software, but is
generally useful for squaring up the pixels in images from the Kontron
ProgRes camera range.
The function returns 0 on success and -1 on error.
The National Gallery, 1997
Sep 18 1997