Sketch recognition method and device based on fusion of three-dimensional sparse convolution and two-dimensional convolution

The invention discloses a sketch recognition method and device based on fusion of three-dimensional sparse convolution and two-dimensional convolution, and the method comprises the steps: obtaining a sketch image, carrying out the feature extraction of the sketch image, and obtaining the features of the sketch image; meanwhile, sketch point feature extraction and voxelization are conducted, by extracting geometric information of all points on strokes of a sketch, the sketch points are voxelized based on the geometric information, and voxels of the points are obtained; then, carrying out feature extraction on voxels of all points of the sketch to obtain sketch voxel features; and finally, fusing the sketch image features and the sketch voxel features, and carrying out classification identification on the sketch through a classifier. The features of the sketch and all sparse points of the sketch are fully utilized, a large blank area of the sketch is removed through Sketch-SparseVoxelNet, the spatial relation o