Robust calibration of a reconfigurable camera array for machine vision inspection (RAMVI): Using rule-based colour recognition

This paper describes a Reconfigurable Arr ay for Machine Vision Inspection (RAMVI) that is ab le to produce spatially-accurate images combining informa tion obtained from several cameras. Automatic camer calibration is essential for minimizing the changeo v r time required to reconfigure the array. This pa per describes an automatic calibration method that uses a colour coded calibration grid (CCG) to determine th field of view of each camera relative to the other cameras. Since colour is integral to the calibratio n process, robust colour recognition is essential, particularl y since several cameras are involved. Hence, a rule -bas d colour recognition methodology is described. Result s are presented demonstrating the effectiveness of this approach under varying lighting conditions.

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