Calibration method of linear structured light three-dimensional visual sensor based on measuring blocks

Abstract

The invention relates to a calibration method of a linear structured light three-dimensional visual sensor based on measuring blocks. The method comprises the steps that the measuring blocks of different specifications are arranged at interval, then measuring block targets are fixed on movable guide rails, tested surfaces of the measuring block targets are ensured to be vertical to the moving direction of the guide rails, the guide rails are moved to obtain an axis coordinate of the measuring block targets and a light bar crossing point under the space coordinates system, and the axis coordinate is substituted into a mathematical model of the linear structured light sensor to be calculated to obtain sensor parameters. The method has the following advantages: the measuring blocks are standard measuring tools and have high precision and low cost; the targets are established by arranging the measuring blocks at interval; light bars projected by a laser projector on the tested surfaces of the measuring blocks can be continuous because of the arrangement of the measuring block, the length of each light bar is the nominal thickness of the measuring blocks. The precision of the targets is improved greatly, simultaneously the cost is lowered, and better cost performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of visual measurement, and in particular relates to a sensor parameter calibration method in three-dimensional visual detection of linear structured light based on gauge blocks. Background technique [0002] At present, the line-structured light vision sensing technology uses a non-contact measurement method with a large measurement range, fast measurement speed, good system flexibility, and moderate accuracy. It has a wide range of applications in the fields of product online inspection and 3D reconstruction. [0003] The line structured light sensor is a visual measurement system based on the principle of optical triangulation. The line structured light projector projects single-line or multi-line structured light onto the measured object, the light strip is modulated by the surface shape of the measured object, and the camera is used to capture the surface image of the measured object containing the modul...

AI Technical Summary

Problems solved by technology

However, the machining accuracy and cost of these features cannot meet the requirements very well.

[0013] To sum up, the current line structure cursor calibration still has disadvantages such as a small number of extracted feature points, high processing costs, and low coordinate accuracy of calibration points.

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