Surface roughness evaluation using machine vision approach and Hurst operator

B. Ramamoorthy; J. N.V. Krishna

doi:10.1117/12.484461

29 July 2002 Surface roughness evaluation using machine vision approach and Hurst operator

B. Ramamoorthy, J. N.V. Krishna

Proceedings Volume 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life; (2002) https://doi.org/10.1117/12.484461
Event: Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, 2002, Novosibirsk, Russian Federation

Abstract

It has been proved by researchers that computer vision has real potential when applied to the automated measurement of surface roughness of engineering components. The present study considers the detailed examination of surface roughness using 2D-image information. First the image is smoothed out using a conventional low pass filter to filter the roughness information from other erroneous information accounting to lighting, waviness, from errors and other effects. A mean value mask is applied over the image a number of times to generate the reference intensity surface. This reference intensity surface is then subtracted from the original image to reveal the surface roughness information. The Hurst operator is then applied over this intensity information to estimate the optical roughness parameter. A correlation graph has to be plotted to relate this optical roughness value with the value (Ra) obtained from the stylus profilometer. In this procedure the workpieces used were of mild steel and they were machined using different processes like milling, shaping and grinding to ensure the repeatability of results. In this process the orientation of workpiece doesn't effect the process and the lighting effect is not considered, and is maintained and assumed that it is identical for all the images.

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B. Ramamoorthy and J. N.V. Krishna "Surface roughness evaluation using machine vision approach and Hurst operator", Proc. SPIE 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, (29 July 2002); https://doi.org/10.1117/12.484461

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KEYWORDS

Surface roughness

Fractal analysis

Image analysis

Calibration

Light sources and illumination

Machine vision

Profilometers

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