Car height on-line measurement method based on area-array/line-scan digital camera

Abstract

The invention relates to measurement on mechanical quantity like the size of a car. In order to obtain the height of the car in an anti-inference(stain), high-accuracy, rapid and real-time mode, a car height on-line measurement method based on an area-array / line-scan digital camera comprises the following steps that the first part is laser light curtain projection, laser device groups are arranged on one side of a laser light curtain frame at equal intervals in a one-dimensional mode, and the laser devices emit laser beams towards the other side of the laser light curtain frame in parallel to form a light curtain; the second part is CCD visual imaging processing, linear laser bright spots imaged by reflection of a scatterer in a CCD imaged picture, linear bright spot features are extracted through the image processing technology, the number of the reflected optical spots is worked out, the number of all the laser device groups is taken into account, then the number of the optical spots shielded by the car body is judged, and the height of the car body is worked out according to the interval of the laser device groups and the vertical height of a laser frame. The car height on-line measurement method based on the area-array / line-scan digital camera is mainly used for outline size measurement of the car.

Description

technical field [0001] The invention relates to the measurement of mechanical quantities such as vehicle dimensions and the like. Specifically, it relates to an online measurement method for vehicle height and dimension based on area array / line array cameras. Background technique [0002] The information of vehicle outer contour size is the most important content of vehicle passability parameters and operation safety detection. In recent years, the over-limit and overloading operation of various vehicles in road transportation has become one of the main causes of road traffic accidents, which seriously affects national property and people's lives. At the same time, its outer contour size is also an important parameter of vehicle manufacturing quality, especially The height dimension measurement of the vehicle to be tested is a key technical link in the measurement of the outer contour dimension of the vehicle; at present, the domestic methods for measuring the height parame...

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Problems solved by technology

Among them, the manual detection method has the limitations of low measurement efficiency, large human error, and unfavorable information management. In view of the above problems in this method, some domestic enterprises and research institutes have developed a laser light curtain receiving method. This method uses The one-dimensional vertically arranged lasers constitute a laser emitting light curtain, and a photoelectric receiver array in the same arrangement is installed within a certain distance opposite it to receive the signal of the emitting light curtain. When the vehicle to be tested passes through the laser light curtain, it passes Calculate the number of received light beams to measure the height of the vehicle. Although this technical solution can obtain the maximum height of the dynamic vehicle, the one-dimensional photoelectric receiver is easily affected by factors such as ambient background light and dust, resulting in errors in the received signal and affecting At the same time, due to the packaging form of the laser transmitter and the light point receiver, the installation interval is limited to a certain extent, which affects the minimum resolution of the laser light curtain, resulting in low measurement accuracy of the system

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