Patent ID: 6721461
Filing Date: 2004-04-13
Classification: G06K,G06T

Abstract:
A machine vision apparatus implementing thresholding in a vision system application involving comparison of a first image and a second image, comprising:an image acquisition device capturing said first image comprising a plurality of first image pixels and said second image comprising a plurality of second image pixels; a memory receiving from said image acquisition device first image information defining said plurality of first image pixels as a respective gray level value for each of said plurality of first image pixels, and receiving second image information defining said plurality of second image pixels as a respective gray level value for each of said plurality of second image pixels; and a processor generating a dynamic threshold image as a function of said gray level value of said first image pixels and said gray level values of said second image pixels, said processor subtracting gray level values of said second image pixels from gray level values of said first image pixels to provide a subtracted image having a plurality of subtracted image pixel values, and said processor implementing thresholding by subtracting said subtracted image from said dynamic threshold image.