Method for evaluating contamination on surface of object and imaging box used for the method
US7343038B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2002 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Nov 27, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30164
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided a method for evaluating the contamination by quantifying the surface contamination of an object such as a window glass plate, a wall, or the like in such a manner that the quantified value is close to the visual sensation of human being. The method comprises the steps of taking a color image of the surface of the object, converting a color image data denoting the color image into a monochromatic image data, dividing a monochromatic image denoted by the monochromatic image data into a dot matrix to obtain lightness per dot, selecting an area to be evaluated on the dot matrix, calculating a standard deviation of lightness from the distribution of lightness of the selected area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.