Single view metrology of wide-angle lens images

2006 ◽  
Vol 22 (7) ◽  
pp. 445-455 ◽  
Author(s):  
Yisong Chen ◽  
Horace H.S. Ip
Keyword(s):  
Wide Angle ◽  
Single View ◽  
Wide Angle Lens ◽  
Single View Metrology

Developmental Risk Through a Wide-Angle Lens

1987 ◽  
Vol 32 (1) ◽  
pp. 54-55
Author(s):  
Jack P. Shonkoff
Keyword(s):  
Wide Angle ◽  
Developmental Risk ◽  
Wide Angle Lens

Fisheye Lens Distortion Calibration Based on the Lens Charactetic Curves

2014 ◽  
Vol 519-520 ◽  
pp. 636-639
Author(s):  
Bao Long Zhang ◽  
Shao Jing Zhang ◽  
Wei Qi Ding ◽  
Hui Shuang Shi
Keyword(s):  
Optical System ◽  
Characteristic Curve ◽  
Calibration Method ◽  
Lens Distortion ◽  
Wide Angle ◽  
Forming Process ◽  
Fisheye Lens ◽  
Large Scope ◽  
Wide Angle Lens ◽  
Barrel Distortion

The fisheye lens is a kind of ultra wide angle lens, which can produce a big super-wide-angle lens distortion. In order to cover a large scope of light, barrel distortion is artificially added to the optical system. However, in some cases this distortion is not allowed, then it requires calibrations of those distortions. Most of the traditional distortion calibration method uses target plane calibration to do it. This paper discusses the way of design fisheye lens, through which we can know the forming process of distortion clearly. Based on this paper, a simple and effective calibration method can be understood. Different from common camera calibration method, the proposed calibration method can avoid the error occurring in the process of calibrating test, that directly use the lens’ characteristic curve. Through multiple sets of experimental verifications, this method is effective and feasible.

Wide-angle lens for miniature capsule endoscope

2006 ◽  
Author(s):  
Mang Ou-Yang ◽  
Yung-Lin Chen ◽  
Hsin-Hung Lee ◽  
Shih-chieh LU ◽  
Hsien-Ming Wu
Keyword(s):  
Capsule Endoscope ◽  
Wide Angle ◽  
Wide Angle Lens

Evaluating the Impact of Wide-Angle Lens Distortion on Learning-based Depth Estimation

2021 ◽  
Author(s):  
Julie Buquet ◽  
Jinsong Zhang ◽  
Patrice Roulet ◽  
Simon Thibault ◽  
Jean-Francois Lalonde
Keyword(s):  
Depth Estimation ◽  
Lens Distortion ◽  
Wide Angle ◽  
Wide Angle Lens ◽  
The Impact

Study on fabric compression under seam vis a vis quantitative measurement of seam boldness and thread consumption for lockstitch 301

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Md Vaseem Chavhan ◽  
Mandapati Ramesh Naidu
Keyword(s):  
Quantitative Measurement ◽  
Multilinear Regression ◽  
New Approach ◽  
Content Type ◽  
Single View ◽  
Sewing Thread ◽  
Stitch Density ◽  
Proposed Model ◽  
Fabric Weight ◽  
Single View Metrology

Purpose This paper aims to develop at sewing thread during the seam formation may lead to the compression of fabric under seam. In the present study, the model has been proposed to predict the seam compression and calculation of seam boldness, as well as thread consumption by considering seam compression. Design/methodology/approach The effect of sewing parameters on the fabric compression at the seam (Cf) for fabrics of varying bulk density was studied by the Taguchi method and also the multilinear regression equation is obtained to predict seam compression by considering these parameters. The framework has been set as per the single view metrology approach to measuring structural seam boldness (Bs). One of the basic geometrical models (Ghosh and Chavhan, 2014) for the prediction of thread consumption at lock stitch has been modified by considering fabric compression at the seam (Cf). Findings The multilinear regression model has been proposed which can predict the compression under seam using easily measurable fabric parameters and stitch density. The seam boldness is successfully calculated quantitatively using the proposed formula with a good correlation with the seam boldness rated subjectively. The thread consumption estimation from the proposed approach was found to be more accurate. Originality/value The compression under seam is found out using easily measurable parameters; fabric thickness, fabric weight and stitch density from the proposed model. The attempt has been made to calculate seam boldness quantitatively and the new approach to find out thread consumption by considering the seam compression has been proposed.

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