Patent ID: 6760471
Filing Date: 2004-07-06
Classification: G01N,G06T

Abstract:
A system for compensating pixel values in a printed circuit board inspection machine, the system comprising:an image acquisition system for digitizing a pixel representing at least a part of the printed circuit board to provide a digitized pixel value at an output of the image acquisition system; a compensation circuit coupled to the output of said image acquisition system and comprising a compensation memory having compensation values stored therein, and a compensating circuit, said compensating circuit comprising an offset correction circuit and a scale correction circuit coupled to said offset correction circuit, said compensating circuit having a first port coupled to said image acquisition system having a second port coupled to said compensation memory and having an output port coupled to said means for transferring, said compensating circuit for combining the digitized pixel value received from said image acquisition circuit at the first port with at least one compensation value received from said compensation memory at the second port to provide a compensated digitized pixel value at the output port; a memory for storing the compensated digitized pixel value; and means for transferring the compensated digitized pixel value between said compensation circuit and said memory.