Patent ID: 9638642
Date: 2017-05-02
CPC Classifications: G01N

Claim:
1. An apparatus for optically scanning a surface of an object under an external soiling condition, comprising: a first imaging sensor unit having one or more optical components subjected to said external soiling condition, a sensing field defining a scanning zone intersecting a target surface of the object, and being configured for generating reflection intensity image data associated with said target surface; a second imaging sensor unit having one or more optical components not subjected to said external soiling condition, a sensing field defining a scanning zone intersecting a reference surface of the object different from said target surface and being configured for generating reflection intensity image data associated with said reference surface; data processing means programmed to calculate correction data from a comparison between said reflected intensity image data associated with said target and reference surfaces, and further programmed to apply the correction data to the reflected intensity image data associated with said target surface to generate corrected intensity image data compensating for said external soiling condition.