Three-dimensional projection mapping method and device

The invention relates to the technical field of data processing, and discloses a three-dimensional projection mapping method and device. The method comprises the following steps that: obtaining a target graph area, carrying out point-to-point scanning to obtain the coordinate of any point in the target graph area; according to the coordinate of any point in the target graph area, calculating the coordinate of a corresponding source image; storing the coordinate of the source image to a cache memory; obtaining the coordinate of the source image from the cache, and converting the coordinate of the source image into the physical address of the source image; according to the physical address and the coordinate of the source image, carrying out interpolation processing to obtain an interpolation pixel; and according to the display coordinate of a current output image, carrying out output. Through the cache, the coordinate of the source image is subjected to on-chip caching, so that main processing modules can carr