Implementation of Barrel Distortion Correction on FPGA

The present era of Engineering has brought tremendous automation in industry as well as in day-to-day standards. Vision based system is playing major role in bringing this automation. It provides capability to visualize things and objects beyond human vision and to extract and analyze all necessary information from it like the X-ray system, automated parking lot or traffic control system, automotive industry, video surveillance for military and security applications etc. Wide angle lens used in these vision based system is powerful tool for magnifying the details and relative size of objects captured using cameras in these systems and display the larger field of view. However problem arises when deviation in the centre of image becomes greater than that at edges. This distorted view of real world scene misjudges the distance of object and its relative position in the scene. This distortion is result of inherent property of the wide angle lens used known as Lens or Radial distortion. Thus the distortion correction becomes important task especially in case of object tracking, automotive and military applications. Several methods to correct this distortion have been found in literature such as polynomial based models, division distortion model, perspective model etc. Implementation of these distortion correction techniques onto efficient hardware will help in developing an ASIC or IP for Wide angle Lens Correction. This paper aims in implementing a Perspective model for Lens distortion correction on Virtex-5 FPGA board capable faster processing and reduced logical resources.