Low-quality fingerprint repair method and system based on tensor decomposition, medium and equipment

The invention belongs to the technical field of fingerprint repair, and provides a low-quality fingerprint repair method and system based on tensor decomposition, a medium and equipment. The method comprises the following steps: acquiring a low-quality fingerprint image, and pre-dividing the low-quality fingerprint image into a plurality of non-overlapped image blocks; searching the most similar image blocks in parallel from different directions around the image blocks, and constructing a similar block group of each image block; performing denoising enhancement processing on the similar block group of each image block to obtain an enhanced similar block group of each image block; directly stacking the similar blocks in the enhanced similar block group of each image block along a third-dimensional direction to form a similar tensor, complementing the similar tensor, and then carrying out image block aggregation; and re-dividing the fingerprint image formed by aggregating the image blocks into a plurality of no