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Lens position calibration method for multi-lens vision acquisition device

A technology of visual acquisition and calibration method, which is applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of no integration, etc., and achieve the effect of improving speed, strong operability, and accurate pixel position

Inactive Publication Date: 2019-12-03
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the laser focus spot detection technology and the precise angle rotation technology of the turntable have not been integrated into the application of lens position calibration in the prior art

Method used

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  • Lens position calibration method for multi-lens vision acquisition device
  • Lens position calibration method for multi-lens vision acquisition device

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Embodiment

[0035] A panoramic camera with four fisheye lenses is used as a visual collection device, see figure 1 , using the method of the present invention to calibrate the position of each fisheye lens to ensure that the optical axes of the four lenses are horizontal and form an angle of 90°. The specific way is:

[0036] (1) Make sure that the center of the laser emitting device 1 is aligned with the center of the turntable 2, fix the four-fisheye lens 3 panoramic camera on the center of the turntable table, and emit laser light.

[0037] (2) Power on the camera, mark the lens that is aligned with the laser source as the first lens, and set the first lens to single-channel image output through the PC, that is, the computer 7, and set the acquisition method to continuous acquisition, and the captured image is through the network port Transfer to PC.

[0038] (3) Use the Zernike moment to extract the edge of the spot, and then calculate the center of the spot by the curve fitting met...

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Abstract

The invention relates to a lens position calibration method of a multi-lens visual collection device. A laser emitting device and a rotary table are provided, a cameral plate is installed on the center of the rotary table, the visual collection device is placed on the camera plate, the visual collection device is provided with a plurality of lenses, and the laser emitting device is arranged outside the rotary table and is aligned to the center of the rotary table. According to the invention, a laser focusing facula detection fine tuning method and a rotary table precise angle rotation method are adopted for finishing optical axis horizontal calibration of each lens and optical axis predetermined angle calibration between two lenses. Laser focusing facula detection is a key technology in optical measurement and aims to utilize a vision to test a laser facula after technical long-distance transmission and position the center of the laser facula. The method can be used for lens position calibration of multi-lens visual collection devices such as a stereo vision camera and a panorama camera, and the method is high in precision, simple in system, low in cost, high in operationality, wide in application and capable of being widely used.

Description

technical field [0001] The invention belongs to the technical field of lens calibration, and relates to machine vision technology, in particular to a lens position calibration method of a multi-lens vision acquisition device. Background technique [0002] The quality of the image stitching is seriously affected by the visual device. Especially in the panoramic vision device using the fisheye lens, due to the large distortion of the fisheye image, when it is necessary to collect stereoscopic images, it is often necessary to use multiple lenses. In order to facilitate image stitching, it is necessary to adjust the optical axis of each lens. Parallelism detection and adjustment. Stereo vision calculates the depth of the scene by observing the parallax between the corresponding image points of an object point in the image taken by multiple different viewpoints in the space. Its effective 3D reconstruction area is the common field of view between the two cameras, so feature poi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00
Inventor 张宝峰朱均超万丽冯为嘉韩芳芳贾艳慧
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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