Non-contact online inspection method for automobile body gap size

Abstract

The invention discloses a non-contact online inspection method for automobile body gap size, aiming at overcoming the problems that the size of equipment is large, the equipment is inconvenient to carry, influences are apt to cause by external factors due to contact-type measurement, and online measurement and large-size covering part gap measurement cannot be realized in the prior art. The non-contact online inspection method comprises the following steps of: 1. camera calibration; 2. image acquisition: placing a gap part of an automobile body covering part in the view field of a camera to take images; 3. stereoscopic matching; and 4. three-dimensional reconstruction, which comprises the steps of: 1) according to a calibration result of a binocular stereoscopic visual system, determining three-dimensional space coordinates of gap edge points of the covering part according to stereoscopic matching points; 2) reconstructing an automobile body gap three-dimensional curve according to the determined three-dimensional space coordinate points; 3) spatially rotating the reconstructed three-dimensional curve according to included angles and directions between the curve and an x-axis, y-axis and a z-axis; and 4) respectively projecting gap curves in planes after rotation to determine the width value and the plane difference value of the gap.

Description

technical field [0001] The invention relates to a method for detecting a car body gap, more specifically, the invention relates to a non-contact on-line detection method for the size of a car body gap. Background technique [0002] During the assembly process of automobiles, it is a common problem that there are large gaps between the covers due to the large size error of the covers, which not only affects the sealing performance of the vehicle, but also affects the size of the gap between the covers and the vibration and noise of the vehicle And it is closely related to the performance. If the gap between adjacent covering parts is too large, such as the gap between the bumper and the engine cover is too large, the assembly accuracy will be reduced, and a lot of vibration and noise will be generated during the use of the vehicle; the door If the seam gap is too large, it will cause the door to sink or not close tightly, which will affect the performance of the vehicle, ther...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problems in the prior art that the equipment is bulky, inconvenient to carry, and is a contact measurement, easily affected by external factors, and cannot meet the requirements of online measurement and large-scale cover gap measurement. A non-contact online detection method for car body gap size

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