Line Finding With Subpixel Precision
P. J. MacVicar-Whelan, Thomas O. Binford · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1981
An intermediate level vision system that utilises grey scale levels (typically 8 bits or 256 levels in our case) has been implemented which locates and links intensity discontinuities in a digitized image to subpixel precision. The discontinuities are located and localised by utilizing the zero crossings in the laterally inhibited image of the digitized picture.