An effective correction method for AFM image distortion due to hysteresis and thermal drift

2020 ◽  
pp. 1-1
Author(s):  
Yinan Wu ◽  
Zhi Fan ◽  
Yongchun Fang ◽  
Cunhuan Liu
Keyword(s):  
Correction Method ◽  
Image Distortion ◽  
Thermal Drift ◽  
Afm Image

Characterization and Correction of Geometric Errors Induced by Thermal Drift in CT Measurements

2014 ◽  
Vol 613 ◽  
pp. 327-334 ◽  
Author(s):  
Fabrício Borges de Oliveira ◽  
Maurício de Campos Porath ◽  
Vitor Camargo Nardelli ◽  
Francisco Augusto Arenhart ◽  
Gustavo Daniel Donatelli
Keyword(s):  
Thermal Effects ◽  
Displacement Vector ◽  
Relative Displacement ◽  
Correction Method ◽  
Thermal Drift ◽  
X Ray ◽  
Ct Measurements ◽  
Industrial Computed Tomography ◽  
Roundness Deviation ◽  
Source Of Error

The occurrence of thermal drift in industrial computed tomography (CT) systems has been reported as a significant source of error on geometrical evaluations. During CT-scans, heating inside the cabinet and varying environmental conditions may affect the position of the focal spot and distort the manipulator system, leading to relative displacement of X-ray projections and distortions in the reconstructed 3D image. This paper presents an experimental investigation on influence of the thermal effects on dimensional CT measurements. A correction method based on the manipulation of the projections was developed and evaluated. The method consists in repeating the acquisition of first projection at the end of the scan and calculating the displacement vector between these projections. The remaining projections are then corrected proportionally to this displacement. The results showed a significant reduction of the roundness deviation values measured on a precision sphere after the correction.

Correction method of image distortion of fisheye lens

2019 ◽  
Vol 48 (9) ◽  
pp. 926002
Author(s):  
吕丽军 Lu Lijun ◽  
刘 盟 Liu Meng ◽  
侍 业 Shi Ye
Keyword(s):  
Correction Method ◽  
Image Distortion ◽  
Fisheye Lens

Researches on Image Distortion Correction Method Based on Image Magnification

2013 ◽  
Vol 650 ◽  
pp. 548-552
Author(s):  
Xiao Ying Jiang ◽  
Jian Liang Xu ◽  
Xiao Feng Fang ◽  
Xin Xing Zhang ◽  
Yin Ling Peng ◽  
...  
Keyword(s):  
Simple Algorithm ◽  
Correction Method ◽  
Image Distortion ◽  
Distortion Correction ◽  
New Method ◽  
Distorted Image ◽  
Image Magnification ◽  
Linear Operation ◽  
The Relationship ◽  
Computing Speed

A new method to correct a distorted image is proposed in this paper, which is based on the relationship between image magnification and distortion coefficient. First, the image magnification is solved. Then, the image distorted coefficient can be obtained with simple linear operation. Ultimately, experiments are carried out, and the correction results obtained by the collinear points-based method are compared with the method proposed in this paper. The results show that both provide good correction effects. At the same time, the accuracy of the new proposed method is higher. The proposed method takes the advantages of simple algorithm, few known conditions and fast computing speed. The new method has great significance in engineering metrology and complex condition.

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