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Barrel-Type Distortion Compensated Fourier Feature Extraction
[chapter]
2013
Lecture Notes in Computer Science
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In case of endoscopic imaging, often significant barrel-type distortions affect the feature extraction. ...
We introduce and evaluate three strategies to partially or completely compensate the geometric distortion in combination with Fourier features. ...
Therefore, in this work, we investigate different ways of extracting barrel-type distortion corrected Fourier features. ...
doi:10.1007/978-3-642-41914-0_6
fatcat:32ofaq2vtjbandfu5doaqi2lyu
Distortion Adaptive Image Classification – An Alternative to Barrel-Type Distortion Correction
[chapter]
2013
Lecture Notes in Computer Science
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The endoscopes, utilized in computer aided celiac disease diagnosis are equipped with wide-angle lenses, which introduce significant barrel-type distortions. ...
Previous work is on rectifying the distortions prior to the feature extraction. However, due to new arising inadequacies this often even decreases the classification accuracy. ...
neighbor patch, in case of classifying barrel-type distorted celiac disease images. ...
doi:10.1007/978-3-642-41939-3_45
fatcat:7dojnmu3ozh2ddlzk4gjkchbb4
Problems in Distortion Corrected Texture Classification and the Impact of Scale and Interpolation
[chapter]
2013
Lecture Notes in Computer Science
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In the field of computer aided celiac disease diagnosis, wide-angle endoscopy lenses are employed which introduce significant barrel type distortions. ...
Although the images can be rectified using distortion correction methods, computer based diagnosis suffers from missing information in highly distorted image regions. ...
In this approach, the circular barrel type distortion is modeled by the division model [3] . ...
doi:10.1007/978-3-642-41181-6_52
fatcat:pdibbcg4kzgy7og3wvk5qckvru
Is a Precise Distortion Estimation Needed for Computer Aided Celiac Disease Diagnosis?
[chapter]
2014
Lecture Notes in Computer Science
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Particularly, we identify one simple but especially for certain features highly effective approximative distortion model. ...
Knowing the discriminative power of all sensible distortion configurations, the model parameters are estimated. ...
In this approach, the circular barrel type distortion is modeled by the division model [1] . ...
doi:10.1007/978-3-319-07998-1_71
fatcat:ecv3syl6tzg3fjactmtqfj47cy
Examining Barrel Distortion, Super-resolution on Single-view-based Ear Biometrics Rotated in Depth
2015
International Journal of Affective Engineering
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Empirical demonstrations show that, using barrel-distorted images and super-resolution images, accuracy decreases. ...
Numerical simulations were performed using super-resolution images and barrel-distorted images to improve the viability of the authors' previous work regarding single-view-based ear biometrics. ...
Images with barrel distortions Fisheye lenses, which take hemispherical views, have barrel distortion to map an infinitely wide object plane into a finite image area. ...
doi:10.5057/ijae.14.103
fatcat:wochqwywnfh3vdsa3d2526l7hm
Applying and extending ISO/TC42 digital camera resolution standards to mobile imaging products
2007
Image Quality and System Performance IV
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In particular, accommodation of optical flare, shading non-uniformity and distortion are recommended. ...
(a) Edge displacement observed because of barrel lens(1)and(2)ripple type distortion. (b) Measured SFR for undistorted edge. Sampling is at 400 ppi. ...
Barrel distortion was introduced in software, with 5% effective optical distortion at the corners. ...
doi:10.1117/12.703645
fatcat:ihapnpjhizeenmekbjlqe37sxa
Multiperspective mosaics for under-vehicle inspection
2004
Unmanned Ground Vehicle Technology VI
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Fig. 7(b) shows the result of barrel distortion correction. ...
Hence, perspective distortion Camera's path Camera's principal axis correction is used to compensate for this. ...
doi:10.1117/12.542795
fatcat:mewyrzv4rbdyjb22fly4ejz3di
Microscope calibration using laser written fluorescence
2018
Optics Express
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We report on the use of two laser written patterns to measure the lateral resolution, illumination uniformity, lens distortion and colour plane alignment using confocal and structured illumination fluorescence ...
Distortion characterisation Distortion is a spatially dependent magnification change and is typically manifested as either a pincushion or barrel distortion of the microscope image. ...
Finally, as the beads themselves are distributed randomly across the field of view, it is not possible to extract any measures of image distortion across the field of view. ...
doi:10.1364/oe.26.021887
pmid:30130891
pmcid:PMC6238825
fatcat:5neivxswkbe7jmi725mhmff47q
Survey on computer aided decision support for diagnosis of celiac disease
2015
Computers in Biology and Medicine
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Consequently, distortion adaptive classification [38, 40] , distortion compensated features based on the Fourier transform [37] as well as intrinsic distortion correction [41] have been proposed. ...
Such barrel-type distortions introduce non-linear changes in the images, leading to a significantly smaller visualization of outer areas. ...
doi:10.1016/j.compbiomed.2015.02.007
pmid:25770906
pmcid:PMC4593300
fatcat:wxhi536np5exheqmzgodfctgsi
AN INVESTIGATION OF DIFFERENT VIDEO WATERMARKING TECHNIQUES
2017
International Journal on Smart Sensing and Intelligent Systems
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In order to detect watermarks from the pre-warped image with barrel distortion, an estimation method of the barrel distortion is proposed for HMDs. ...
Then, the same warp is enforced on the embedded watermark mask with the estimated parameters of barrel distortion. ...
doi:10.21307/ijssis-2017-217
fatcat:wamzxdqkifgc7l7f4k2y6ihsxa
Robust Retina-Based Person Authentication Using The Sparse Classifier
2012
Zenodo
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This type of feature extraction offers us an additional set of invariance properties to some simple transformation of the SIFT descriptors. ...
The person-related distortions are small rotations, translations and scalings of the original image, the optics-related distortion are blurring, barrel and pincushion transforms applied to the original ...
doi:10.5281/zenodo.52386
fatcat:mwa64ubn4bcavgc6r67yw43cu4
Quantifying distortions in two-photon remote focussing microscope images using a volumetric calibration specimen
2014
Frontiers in Physiology
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Finally, by first approximating and then compensating the distortion in imaging data from whole heart rodent studies, the variance of sarcomere length (SL) measurements was reduced by almost 50%. ...
The origin of the distortion is first identified through simulation of a remote focussing microscope. ...
Whilst this necessarily introduces distortions, if the distortions are known then they can be compensated for in post-processing. ...
doi:10.3389/fphys.2014.00384
pmid:25339910
pmcid:PMC4189333
fatcat:nwb5chlt5rcdvobafsvbutn2je
Imaging properties of large field-of-view quadratic metalenses and their applications to fingerprint detection
[article]
2021
arXiv
pre-print
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In this work, we provide an in-depth analysis of the imaging properties of quadratic metalenses and, in particular, show that due to their intrinsic barrel distortion or fish-eye effect, there is a fundamental ...
how to harness the full potential of quadratic metalenses, we apply these considerations to the fingerprint detection problem, and demonstrate experimentally the full imaging of a 5mm fingerprint with features ...
The barrel distortion in itself is not a problem for imaging since it can be compensated with a post-processing treatment (see next Section). ...
arXiv:2102.07999v2
fatcat:xiketm32ffgrpk5nenwdzkzp6q
Design, implementation, and characterization of a kinematically aligned, cascaded spot- array generator for a modulator-based free-space optical interconnect
2000
Applied Optics
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OPS Module Degrees of FreedomDesign Requirement Optical-Optomechanical Solution Spots on a uniform grid Low-distortion Fourier lens Spot pitch of 1600 m ϫ 800 m Adjust focal length of Fourier lens with ...
It also provides a large field size ͑7.7 mm͒, while maintaining low field curvature and distortion ͑ f Ϫ sin distortion of less than 0.025% across the 20.7°fi eld of view͒. ...
doi:10.1364/ao.39.000733
pmid:18337948
fatcat:npgmjac3s5d7lhlalmii33swpy
Biologically Inspired Motion Encoding for Robust Global Motion Estimation
2017
IEEE Transactions on Image Processing
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by barrel distortion; (c) Ego-centric3, a scene with barrel distortions and large outlier motions; (d) Flower, a scene with elements of varying depth; (e) Coastguard, two (visually salient) ships are ...
In addition to outlier local motions (e.g. moving robot, people), these sequences have the challenge of high barrel (lens) distortion, which is not possible to compensate with homographic transformations ...
doi:10.1109/tip.2017.2651394
pmid:28129154
fatcat:qi7ixrpaqndcxgbjjda6ftgtxy
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