Double-telecentric lens calibration method based on binary quartic polynomial distortion error compensation

A bi-telecentric lens, quartic polynomial technology, applied in image data processing, instruments, calculations, etc., can solve problems such as low accuracy

Inactive Publication Date: 2015-09-02
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to overcome the deficiency of low accuracy of the existing bi-telecentric lens calibration method, the present invention provides a bi-telecentric lens calibration method based on binary quaternary polynomial distortion error compensation

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  • Double-telecentric lens calibration method based on binary quartic polynomial distortion error compensation
  • Double-telecentric lens calibration method based on binary quartic polynomial distortion error compensation
  • Double-telecentric lens calibration method based on binary quartic polynomial distortion error compensation

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Embodiment Construction

[0035] refer to Figure 1-3 . The specific steps of the bi-telecentric lens calibration method based on the binary quaternary polynomial distortion error compensation of the present invention are as follows:

[0036] Step 1: In this embodiment, the BT-2364 bi-telecentric lens of BTOS and the MV-VD500SM high-resolution camera of the dimension image are selected. Due to the heavy weight of the bi-telecentric lens, in order to avoid the breakage of the connection between the camera and the lens, the bi-telecentric lens is connected to the camera and installed on the bi-telecentric lens holder, and then fixed on the precision rotary table, precision angle stage And on the optical adjustment table composed of guide rail device, etc., to facilitate the adjustment of the shooting angle and position of the camera. After the installation is complete, connect the camera to the PC, open the camera control software, and prepare for image acquisition.

[0037] Step 2: Select the AFT-MCT-O...

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Abstract

The invention discloses a double-telecentric lens calibration method based on binary quartic polynomial distortion error compensation, and the method is used to solve a technical problem that an existing double-telecentric lens calibration method is low in precision. The technical scheme is that a double-telecentric lens and a CCD camera are used to set up a telecentric measuring system, a checker calibration board is adjusted to obtain clear calibration board images, a Harris algorithm is applied to obtain sub pixel angle point coordinates of a checker image; considering that a distortion center would influence the calibration precision, a u0 and a v0 are introduced when a parallel projection model of a double-telecentric lens is established; according to an existing distortion model, a binary quartic polynomial is used to perform distortion error compensation; according to characteristics of the established model, in a calibration solving process, a three-step method is used, and a calibration parameter linear resolution result is used as an initial value of a nonlinear optimization input parameter, so as to improve optimization efficiency. The method is simple in calibration process, other special experiment equipment is not needed, and calibration precision of the double-telecentric lens is improved.

Description

technical field [0001] The invention relates to a bi-telecentric lens calibration method, in particular to a bi-telecentric lens calibration method based on binary quaternary polynomial distortion error compensation. Background technique [0002] In the field of engineering, parts with complex shape curves and surface features play a pivotal role, so it is of great significance to accurately and efficiently evaluate their shape features such as contour curves and surfaces. Traditional measurement technology has great limitations in the measurement of these parts. As an emerging measurement technology, visual measurement technology has the characteristics of fast measurement speed and high precision. It has been widely used in precision manufacturing and other fields. In recent years, with the development of optical devices, more and more bi-telecentric lenses are used for scene acquisition and detection in visual measurement. This is because the bi-telecentric lens has low...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T7/80
Inventor 常智勇蒋超锋杨海成卢津赵霞霞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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