Method and apparatus for assessing surface roughness
Patent 4878114 Issued on October 31, 1989. Estimated Expiration Date: 
May 10, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 10, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3805035 Microfinish measurement apparatus and technique Automatic surface inspection system Method and apparatus for automatic quantitative measurement of textures by image analysis Electro-optical part inspection in the presence of contamination and surface finish variation Patent #: 4667231 InventorsAssigneeApplicationNo. 192699 filed on 05/10/1988US Classes:382/108, Surface texture or roughness measuring73/105, Roughness348/128, Of surface (e.g., texture or smoothness, etc.)382/168, HISTOGRAM PROCESSING702/167ContouringExaminersPrimary: Peng, John K.Attorney, Agent or FirmInternational ClassesH04N 007/00H04N 007/18 AbstractA relatively low cost processor based optical system is used to carry out the method. An area of the surface whose roughness is to be assessed is illuminated by a light source, and a reflected light is directed to the lens of the video camera. The analog output of the video camera is digitized, and the digital signal is provided to a processor which performs an analysis to provide a parameter indicative of the roughness of the surface.Other References
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