Abstract
An assessment of surface quality in turned and milled specimens is made utilizing a PC-based digital imaging system. Two different methods of surface finish measurement are examined and compared. The first approach, as pioneered by Luk and Huynh, utilizes the intensity histogram of the surface image to characterize surface roughness and quality. Changes in the statistical descriptors of the histogram serve to quantify the surface finish. A second method utilizes the two-dimensional Fast Fourier Transform of the digitized surface image. The magnitude and frequency information obtained from the FFT are used as measurement parameters of the surface finish. Advantages and disadvantages of these two methods are discussed and compared.
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