Hand-drawn picture preprocessing method and device

The invention discloses a hand-drawn picture preprocessing method and device. According to an analysis result of a hand-drawn picture recognition model on the component layout of hand-drawn pictures drawn by a tablet personal computer and a personal computer and paper hand-drawn pictures, automatic configuration of types and positions of visual page components is realized. Due to the application of the picture preprocessing technology, the precision of the hand-drawn picture recognition model is greatly improved, and then the tedious process that a visual page designer searches for corresponding components in a huge component library according to hand-drawn pictures, and then layout configuration needs to be conducted on a UE visual design interface can be avoided. The problems that when contrast ratios of all areas in a hand-drawn picture are inconsistent, only graying processing is carried out, so that the brightness of a visual component is not enough, the brightness of the visual component is not obvious