Construction optical visual sense transducer calibration method based on plane targets

Abstract

This invention belongs to measuring technique field and relates to an improvement for the sensor parameters calibration in the measuring of optical three-dimensional vision. The steps of the invention are the following: to set target, to photo target image; to calibrate inner parameters in camera; to photo sensor calibration image; to distortion correct the sensor calibration image; to calculate sensor calibration characteristic points; to calculate the local world coordinates of sensor calibration characteristic points; calculate conversion matrix of camera; to calculate whole world coordinates of calibration characteristic points; to calibrate structure parameters of laser vision sensor; to save the parameters. This method is of high calibration accuracy and simple process and needn't accessory equipment with high cost and is especially suitable to the on-spot calibration of optical vision sensor.

Description

technical field [0001] The invention belongs to the technical field of measurement and relates to the improvement of a sensor parameter calibration method in structured light three-dimensional vision detection. Background technique [0002] Accurately obtaining 3D information of the objective world is a key issue in many fields such as rapid product design, product quality control, CAD / CAM, medical diagnosis, cultural relic identification, clothing design, automatic navigation, and virtual reality systems. As one of the main means of obtaining 3D information, the structured light visual inspection method has the advantages of large range, non-contact, fast speed, good system flexibility, and moderate accuracy. It is widely used in 3D model reconstruction, 3D information measurement of object surface contours and other fields. The effective calibration method of structured light vision sensor model parameters has always been an important research content. At present, there a...

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Problems solved by technology

This method has the following disadvantages: First, the extraction accuracy of the image point is low due to the reflection of the teeth

Second, external equipment is required to strictly adjust the optical plane to be perpendicular to a certain reference plane (toothed target base plane), which is difficult to achieve and is not suitable for on-site calibration

This method requires a high-precision three-dimensional calibration target composed of at least two mutually perpendicular planes. The processing cost of the three-dimensional target is high, and maintenance is difficult. Moreover, it is difficult to obtain high-quality calibration images and calibration points due to mutual occlusion of light between the planes. not too many

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