Method for measuring dimension of outer contour of movable laser scanning vehicle

Abstract

The invention discloses a method for measuring the dimension of the outer contour of a movable laser scanning vehicle and belongs to the technical field of vehicle inspection. The method comprises the steps of sampling the coordinate data (x1i, z11i), (y1i, z12i), (x2h, z21h) and (y2h, z22h) of the outer contour of the vehicle to be inspected (7) periodically; conducting digital filtering processing on the sampled coordinate data to obtain fitting functions fn(x1j), fn(y1p), fm(x2k) and fm(y2s) and displacement number sequences {z11j},{z12p},{z21k} and {z22s}; calculating maximum value and minimal value sequences and maximum value and minimal value of the corresponding sequences so as to accurately calculate the height H, width W and length L of the outer contour of the vehicle to be inspected (7). A measurement device for realizing the measurement method is used for being installed in various environments and is convenient to install, low in cost and capable of accurately measuring the dimensions of the outer contours of all vehicle models in a fully-automatic mode.

Description

technical field [0001] The invention relates to a method for measuring the outer contour size of a movable laser scanning vehicle, which belongs to the technical field of vehicle inspection. Background technique [0002] Motor vehicles have become one of the indispensable means of transportation in the current society. However, in order to obtain greater economic benefits, some vehicle users who are used for cargo / passenger transportation increase the vehicle volume by modifying the size of the vehicle to reach the one-time transportation volume of the vehicle. The purpose is to reduce transportation costs. However, this measure seriously violates the safety standards for vehicle use and exceeds the national standards, especially for vehicles that are longer and wider. . Therefore, in order to ensure the safety of the vehicle and maintain the country's regulations on "trucks, trailers, and passenger cars with a length of more than 6 meters, the vehicle outline must be inspe...

AI Technical Summary

Problems solved by technology

[0004] 1. The side and corner information of the object cannot be displayed, or the corners of the captured object are inaccurate and there are errors, and the error will be larger when encountering non-right angles and non-straight edges;

[0005] 2. The image of the darkest and brightest part of the subject is blurred and the complete image cannot be obtained, which is greatly affected by the weather and light;

[0006] 3. It cannot be applied to indoor measurement. Small trucks are about 4 meters, general trucks are about 10-16 meters, and large trucks are about 21 meters. If the measurement camera cannot be reasonably configured, all the measured objects will be in the measurement field formed by the camera. , the length, width and height parameters of the vehicle under test cannot be completely measured;

[0007] 4. Occupies too much space, not suitable for small testing stations

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