Denoising and filtering method suitable for 3D grid, terminal and readable storage medium

The invention discloses a denoising and filtering method suitable for a 3D grid, a terminal and a readable storage medium, and the method comprises the steps: obtaining 3D grid data, and selecting a plurality of to-be-processed patch units according to the 3D grid data; acquiring a neighborhood patch of each to-be-processed patch unit in a set step length range, forming a plurality of neighborhood patch sets in one-to-one correspondence with the to-be-processed patch units, and calculating the similarity between each to-be-processed patch unit and the corresponding neighborhood patch set; and according to the similarity between each to-be-processed surface patch unit and the corresponding neighborhood surface patch set, carrying out filtering processing on each to-be-processed surface patch unit. According to the method, the similarity between the surface patch and the surrounding neighborhood surface patch set is calculated according to the geometrical characteristics of the 3D grid, and the proper surface p