Surface condition estimating apparatus
US4989973A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1989 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Oct 2, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/435
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for estimating a surface condition of a plate object. The apparatus comprises a lighting unit for generating light toward the plate object. A light sensor is located out of paths of the light generated from the lighting unit for producing an electrical signal in response to light of diffused reflection from the plate object. The apparatus also includes a processing unit for processing the electrical signal fed thereto from the light sensor for producing an image including a defective portion reflective of the light of diffused reflection, and an estimating unit for estimating the surface condition of the plate object based on the defective portion of the produced image. In another aspect of the invention, the apparatus comprises a lighting unit for generating light toward the plate object. A light sensor is provided for converting brightness variations of the light impinging on the plate object into an electrical signal. The apparatus also includes a processing unit for processing the electrical signal fed thereto from the light sensor for producing a plurality of image segments forming a full image of the surface of the plate object, and an estimating unit for estimat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.