APPARATUS AND METHOD TO LOCATE AN OBJECT

摘要

Method and arrangement to locate an object with a predetermined number of marks, the arrangement comprising a light source, a sensor and a processor, by means of the following steps:- illuminating the object with the light source ;- receiving an image of the object and generate image pixel data including ima ge pixel locations and image pixel intensities for each image pixel location wi th said sensor;- receiving the image pixel data and storing them in a memory;- comparing said image pixel intensities with a predetermined threshold;- determining object position based on said comparing;- using a digital match mask that corresponds with said object with said marks;- finding a best matc h between said digital match mask and said object on said object position;- determining mark positions within said object position from said best match.