Defect detection system for lumber
US5960104A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 16, 1996 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Aug 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30161
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A machine vision system that can address a number of board, lineal, cant, and flitch inspection problems by incorporating all the sensors needed to address the surface feature detection problem, the three-dimensional shape detection problem, and the internal feature detection problem. To detect surface features, two color cameras are employed, one for imaging each of the major faces of a board, lineal, cant, or fitch. To address the three-dimensional shape detection problem, a high speed laser profiling device is employed. An x-ray scanning system is employed to detect internal features. The system is able to process material in a species-independent manner by using a histogram-based segmentation procedure for analyzing both the camera imagery and the x-ray imagery; and can detect small defects by removing the effects of large features from the histograms once they have been detected. The system also utilizes redundant information from the set of multiple sensors to improve system accuracy. The volume of data that must be analyzed due the use of three sets of sensors is reduced by ordering the way the data is analyzed. The laser profile data is processed first, followed by the x-ra…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.