On the basis of natural suture algorithm of fade in and fade out,a novel image automatic mosaic algorithm based on hardware is presented in order to capture whole and massive printed circuit board (PCB) photoelectric image,and its basic principle is analyzed. Noise in the PCB photoelectric image is filtered through median filtering. Because of the character of unitary obscuration of the image captured and its gray redundance in image histogram,a novel algorithm of image enhancement that combines removing gray redundance and using gray transform is presented,and its basic principle is analyzed. The whole and massive PCB photoelectric image is captured by the image mosaic algorithm proposed in the experiment. After image preprocessing,the enhancement result of the small part of the whole and massive PCB photoelectric image with our enhancement algorithm is better than that by other enhancement algorithms on the aspects of subjectivity and objectivity.