Measurement System based on 2d Visual Servoing Technique

Abstract

Normally, when an object is imaged using a camera, the region of interest within the object, away from the image center, tend to have variation in geometry from the original. This is due to the Barrel distortion caused by the lens, where the centre of the image is much magnified than the perimeter. This causes error in the measurement in the regions which are away from the image center. To avoid such error the central axis of the camera should align with the centre of the region of interest. The proposed system uses Visual servoing technique to move the XY table in desired direction. Visual servoing helps to locate the area of interest within the object, exactly in the imaging axis of the camera, so that the error due to barrel distortion can be eliminated.