Method for comparison of surfaces

Details Method for comparison of surfaces Method for comparison of surfaces

1987-12-09

1989-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, 356371, 356394, G01N 2186

Patent

active

048475106

ABSTRACT:
A method is presented for the comparison of a second surface with a normalized surface model generated by reference to a group of esthetically acceptable first surfaces. A light pattern is typically projected onto a plurality of first surfaces moving beneath a light projection apparatus such that the light reflected from the first surfaces is received by a light receiver apparatus, and thereafter evaluated by appropriate computer software to define a nominal surface for the first group of esthetically acceptable surfaces. Each additional second surface passed below the light projection and light receiver apparatus is then compared to the normalized model generated by the first articles, such that undesirable surface deformities in the second article become readily apparent.

REFERENCES:
patent: 4290698 (1981-09-01), Milana
patent: 4561103 (1985-12-01), Horiguchi et al.
patent: 4641357 (1987-02-01), Satoh
patent: 4650334 (1987-03-01), Alster et al.
patent: 4677680 (1987-06-01), Harima et al.

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