Method and apparatus for implementing optical roll scanning to identify defects in roll components used in an image production device
US9224197B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2013 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Mar 15, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30164
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method are provided for employing a unique optical roll scanning technique, scheme or process for detecting and identifying periodic surface defects associated with rolls usable in image production devices. An apparatus is provided for mounting the roll to implement an inspection technique that facilitates forming an image of a surface of the roll by rotating the roll through an entire cycle above a full width scanner device. The formed image of the surface of the scanned roll is filtered and analyzed particularly by applying a Fourier analysis technique, and/or by subjecting the filtered image data to a series of fast Fourier transforms (FFTs), potentially including 2D FFTs. The analysis process allows detected periodic defects in the formed image of the surface of the roll under analysis to be characterized by a magnitude of a response in a spatial frequency domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.