Plane fixed-height calibration device

Abstract

The invention discloses a plane fixed-height calibration device and belongs to the technical field of machine vision. The plane fixed-height calibration device comprises height measuring instruments arranged on a camera mounting surface, height adjusters arranged below a calibration plate or a to-be-measured object; before the to-be-measured object is shot each time, the height measuring instruments measure the vertical height differences from the respective lower surfaces of the height measuring instruments to the to-be-measured object; and if the height difference is large, the height adjusters below corresponding positions are adjusted to make the height difference small through a PC; if the height difference is small, the height adjusters below corresponding positions are adjusted to make the height difference large through the PC; finally, the height difference of each position is consistent with that obtained during calibration, the surface of the to-be-measured object is made tobe the same as the plane where the calibration plate is located; then local images shot by multiple cameras in a combined mode can be accurately spliced, and measurement precision is improved; accurate measurement and adjustment of the distances from the cameras to the calibration plate or the surface of the to-be-measured object are realized, and the height adjustment method is simple and feasible.

Description

Technical field [0001] The invention belongs to the technical field of machine vision, and specifically relates to a plane height calibration device. Background technique [0002] In the field of machine vision, a joint calibration method is often used when shooting large-scale objects. Several cameras are combined to shoot and image, and then spliced ​​for inspection. Due to the technical limitations of the camera and lens, a small field of view high-precision camera or lens is far cheaper than a large field of view high-precision camera. Joint calibration means that the partial images taken by multiple cameras can be accurately stitched into a complete image in the same reference frame through the algorithm. If it is used to expand the field of view, after the joint calibration, the partial image can be accurate in the same plane reference frame as the calibration plate. Flatten. If the object detected each time after calibration is still in the calibration plane, there is no...

AI Technical Summary

Problems solved by technology

In this patent, the distance between the lens and the object to be measured is ensured by setting the mounting bracket. However, after a long time of work, the vibration of the horizontal movement mechanism during movement will inevitably change the distance, and the distance needs to be corrected again. Therefore, the actual shooting accuracy of this device in use is also low, which cannot meet the needs of puzzles

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