VELOCITY MEASUREMENT BASED ON IMAGE BLUR

This work gathers elements for the study and analysis of the main problems and difficulties inherent to the implementation of a device for inspection of a speedometer of automotive vehicles, in order to meet the foreseen Brazilian legislation which defines the maximum allowed error for speed-meters of ± 5km/h for speeds up to 100km/h and ± 5% for speeds above 100km/h. From this study, a new non contact method based on image analysis, specifically the blur effect, is proposed. In the method, the speed of the target surface is determined by analyzing the characteristics and regularities contained in a single blurred image. Using a device that simulates the soil movement, a CCD camera and a frame grabber, images of the moving asphalt surface are acquired. The information of speed is then determined, through the analysis of the regularities contained in the dynamic image due to the blur effect. The necessary results for the inspection are achieved successfully, with precision below 5%. The developed and evaluated technique demonstrates, through a device that simulates the asphalt in movement, a precision of 0,8% in a range of speeds from 0 to 20km/h, 1,5% in a range of speeds from 20km/h to 60km/h and 2,5% in a range of speeds from 60km/h to 80km/h. Finally, it was investigated the preponderant factors which have limited the errors in this order of magnitude.

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