Sparse point cloud-based live-action three-dimensional reconstruction method and device, equipment and medium

The invention provides a live-action three-dimensional reconstruction method and device based on sparse point cloud, equipment and a medium, and belongs to the technical field of live-action three-dimensional reconstruction. The method comprises the steps of solving a corresponding inverse matrix for each camera projection matrix, respectively selecting N image views and N camera projection matrixes which meet a forward intersection relation for each object space point belonging to the sparse three-dimensional point cloud, selecting a target image area with an optimal visual angle in the corresponding N image views through the N camera projection matrixes, and obtaining a target image area with an optimal visual angle in the target image area. And performing back projection on each target image area in the corresponding image view by adopting each inverse matrix to form a target texture surface patch attached to the corresponding object space point. The live-action three-dimensional reconstruction method, dev