522 research outputs found
Wiper elimination and image recovery for windshield of vehicles
No full textA lot of developments of intelligent systems on the vehicles are growing these days. One of the most important purposes is for driving safety, which has been one of the goals that people have been always pursuing. This thesis aims at assisting drivers to drive in rainy days using the techniques of image processing. When it rains a little, raindrops and rain streaks can distort the image on the vehicle\ue2s windshield; however, when it rains heavily, the wiper system will be turned on and swing of the wiper inevitably interferes the driver\ue2s sight.
Swing of the wiper not only blocks the driver\ue2s sight periodically, but also continuously swinging wipers may bring about fatigue of the driver\ue2s eyes and affect decision making of the driver. Therefore, this research focuses on wiper acquisition, wiper elimination and image recovery. In this thesis, the approaches of optical flow and temporal difference are applied. Poor results at both ends due to slow swing speed are amended. A simple algorithm for image recovery using three images is also developed for the purpose of efficiency in real-time implementation.
Finally, the acquisition rate and the performance of image recovery using those two approaches are analyzed and compared. The acquisition rate is obtained using the method of background subtraction and those two approaches based on designed experimental videos. The performance of image recovery is calculated according to specific images. Experimental results clearly show that the temporal difference approach is better than optical flow method in most cases
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