The current spray effect of the whole vehicle, because of the body, paint cleanliness, the use of technology: temperature, drying time, mechanical equipment, environmental changes and other factors, make the whole vehicle spraying workshop dust, dirt, orange peel, scratches and other defects. Manual detection of defects labor, low detection efficiency, and the existence of missed detection, false detection and other conditions, the hidden cost of rework is high, not easy to intelligent management.