Face three-dimensional key point extraction method and device and model creation method and system

The invention provides a face three-dimensional key point extraction method and apparatus, and a model creation method and system. The face three-dimensional key point extraction method comprises the steps of obtaining first two-dimensional image data and corresponding point cloud data of a face; extracting face two-dimensional key points from the first two-dimensional image data; image structured storage is carried out on the point cloud data to obtain corresponding face point cloud structured storage data, and three-dimensional points and pixel points at the same face position have the same storage position between the face point cloud structured storage data and the first two-dimensional image data; three-dimensional points in the face point cloud structured storage data have three-dimensional data channels; and mapping the extracted face two-dimensional key points to face point cloud structured storage data, and taking three-dimensional points mapped by the face two-dimensional key points in the face poin