Surface digitization is a method for obtaining the three-dimensional profiles of unknown surfaces. The performance and quality of digitization are dependent upon the choice of digitizing devices and approaches. An efficient digitizing method not only reduces the elapsed time of digitizing process, but also improves the precision of measurement. This article presents a new nonuniform technique for digitizing sculptured surfaces based on short time Fourier transform (STFT). The digitizing distances in thexandydirections for each pre-divided block of the surface are adjusted according to the highest spatial frequency contained in the block. This approach is a contrast to the uniform technique in which the digitizing distances are determined according to the highest spatial frequency of the entire surface. The speed of the digitizing process is thus improved while the accuracy is maintained. Simulations and experimental results are provided to verify the proposed method.
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