PCB photoelectric image obtaining and pre-treating method

A PCB photoelectric image obtaining and pre-treating method including the steps of allowing a conveyor belt to rotate at a uniform speed when driven by a high-precision step servo motor system, the conveyor belt driving a PCB to conduct high-precision uniform-speed linear motion under the friction force effect, distributing a one-dimensional linear array CCD formed by a plurality of CCDs along the width direction of the PCB, fixing a high brightness linear light source above the PCB along the width direction to irradiate partial PCB right below the CCD, and an image acquisition card in a PC acquiring partial PCB photoelectric images taken by the linear array CCD to obtain a PCB photoelectric image of a complete area. Since an algorithm combing removing gray redundance (RGR) and gray transformation (GT) is employed, the non-redundant gray level of an image is maintained, and the details of the image are clear and distinct. The method is suitable for companies producing or researching large area printed circuit