Nonmetric Calibration of Camera Lens Distortion

Jing, 张靖 Zhang; Dayong, 朱大勇 Zhu; Zhiyong, 张志勇 Zhang

doi:10.3788/aos20082808.1552

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accuracy of the movement and the position of the feature point is determined mainly by a servo (or stepper) system, requirement can be met by suitable selection. There are lots of factors including lens distortion, non-ideal light and imaging conditions, positioning algorithm failure etc., which cause position errors in the original image however studies on such problems has also been a lot [4][5] [6]. One can also fix such problems with sophisticated design with the optical system and method of computation.…”

Section: Error Analysis For Pcb Alignment Based On Image Measurementmentioning

confidence: 99%

An Immediate Error Compensation Method for PCB Alignment Based on Image Measurement

Zhang

Hong

Zhao

et al. 2014

AMM

View full text Add to dashboard Cite

The parallelism between an industrial camera and a servo motion direction is corrected with the help of image measurement to shadowed geometric contours. Then a nearly orthogonal angle between XY servo motion directions is obtained according to an inherent geometry relationship in contours. The installation error of a PCB in platform is compensated based on automatic multi-spot imaging finally. An experimental prototype was built while the PCB alignment was implemented on a lot of samples according to the method introduced above. It proves that the developed immediate alignment method as well as its specific embodiment fulfills the requirement of positioning accuracy in the initial design.

show abstract

Section: Error Analysis For Pcb Alignment Based On Image Measurementmentioning

confidence: 99%

An Immediate Error Compensation Method for PCB Alignment Based on Image Measurement

Zhang

Hong

Zhao

et al. 2014

AMM

View full text Add to dashboard Cite

show abstract

Lens distortion correction method based on linear approximation

Xin²,

et al. 2015

2015 International Conference on Computer and Computational Sciences (ICCCS)

View full text Add to dashboard Cite

Nonmetric Correction of Lens Distortion Based on Entropy Measure

Chen

Sun

Zhang

et al. 2018

Scientific Programming

View full text Add to dashboard Cite

In the real vision system, lens always inevitably contains nonlinear distortion, which leads to geometric distortion of digital image, so it must be corrected. In this paper, a nonmetric correction algorithm for lens distortion based on entropy measure is proposed. The algorithm uses the imaging characteristics of the space line in the ideal perspective model, and the distortion entropy is defined to measure the degree of lens distortion. For distortion curves with different distribution, the calculation dimension of distortion entropy measure is uniform, which can reduce the influence of curve inhomogeneity. On this basis, the modified distortion entropy measure with normalized weight is put forward to enhance the capability of noise suppression, and the distortion correction performance of the traditional interior point optimization algorithm, basic artificial bee colony (ABC) algorithm, and Gbest-guided artificial bee colony (GABC) algorithm is compared and analyzed. The simulation experiments demonstrate that the correction performance of GABC to optimize the modified distortion entropy measure with normalized weight is best, and it has strong robustness to noise. Finally, the actual image distortion correction examples verify the effectiveness of the proposed algorithm.

show abstract

Nonmetric Calibration of Camera Lens Distortion

Cited by 3 publications

References 0 publications

An Immediate Error Compensation Method for PCB Alignment Based on Image Measurement

An Immediate Error Compensation Method for PCB Alignment Based on Image Measurement

Lens distortion correction method based on linear approximation

Nonmetric Correction of Lens Distortion Based on Entropy Measure

Contact Info

Product

Resources

About