Patent ID: 7991216

Claim:
A method of analyzing the effectiveness of polishing frequency and the number of polishing times of the polishing pad having different patterns and profile, the method comprising the steps of: providing an image of polishing pad and a wafer image; converting the image of polishing pad and the wafer image into a plurality of pixel matrices, respectively; processing the pixel matrices into a plurality of monochrome images, respectively; converting the monochrome images into a plurality of numerical matrices, respectively; transforming the numerical matrices into a plurality of binary numerical matrices including values “0” and “1”; constructing the numerical matrices of the wafer and the polishing pad; calculating the effective number of polishing times while one position on the polishing pad polishes the wafer along a predetermined movement path during the interval increment of the polishing time; calculating the numerical matrix associated with the effective number of polishing times while one position on the polishing pad polishes the wafer during the interval increment of the polishing time; correcting a deformation error and a cumulative error of the number of polishing times due to the different pattern and profile of the polishing pad; and calculating the effective number of the polishing times and the polishing frequency of the wafer after superposing the matrix of the effective number of times on the wafer during a span of time.