0756152-A1 is referenced by 2 patents and cites 7 patents.

The method employs a pattern (2) of alternately white and black zones (12,13) illuminated with white light (16) whose reflection (6) in the surface (11) of a workpiece (1) is scanned by a CCD camera (3) connected to an electronic digitiser (21), computer (20) and display screen (22). The image is examined for variations in contrast caused by local rough spots. The contrast of each pixel is compared with the maximum observed among its neighbours, with angle of incidence regulated so that the loss of overall reflectance by scattering does not exceed 40%.

Title
Method and device for detecting the state of the surface of parts with a reflecting surface, applicable for controlling the roughness of polished parts
Application Number
EP19960401681 19960726
Publication Number
0756152 (A1)
Application Date
July 26, 1996
Publication Date
January 29, 1997
Inventor
Levy Yves Emmanuel
FR
Delyon Francois
FR
Assignee
Satimage
FR
IPC
G01B 11/30
G01B 11/30
G01B 11/30
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