Automatic Distortion Correction of Endoscopic Images Captured With Wide-Angle Zoom Lens

Lee, Tung-Ying; Chang, Tzu-Shan; Wei, Chen-Hao; Lai, Shang-Hong; Liu, Kai-Che; Wu, Hurng‐Sheng

doi:10.1109/tbme.2013.2261816

Cited by 24 publications

(3 citation statements)

References 27 publications

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“…Differences in air to water values can be explained by the different refractive-index matching. The correction of distortion in endoscopic devices [28][29][30][31] and thus image quality improvement may also be a future development based on data sets like the here presented. As can be derived from the obtained results the geometric barrel distortion is smaller under water compared to the air experiment.…”

Section: Discussionmentioning

confidence: 99%

Comparative investigation of reusable and single–use flexible endoscopes for urological interventions

Eisel

Strittmatter

Ströbl

et al. 2020

Sci Rep

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In order to evaluate the technical adaptability of a type of disposable endoscope compared to reusable flexible endoscopes, in vitro and in vivo studies were conducted. A disposable digital ureteroscope ("chip on tip") and two reusable endoscopes were investigated with respect to spatial resolution, geometric distortion in air and water the maximum. Additionally, the clinical performance of the disposable device was tested during clinical procedures (n = 20). The disposable endoscope showed an optical resolution of 6.72 lines/mm at 10 mm distance, similar to the other devices. In comparison, the disposable endoscope showed a barrel-shaped image distortion in air of −24.2%, which is in the middle range, but was best under water (−8.6%). The bendability of 297° (275 µm fiber) and 316° (empty channel, 1.5 F basket) and the maximum irrigation (1 m: 58.1 ml/min, 2 m: 91.9 ml/min) were convincing. Clinically the maneuverability was very good in (13/20), good or satisfactory in (7/20). Visibility was evaluated as very good in (11/20), just in (1/20) either satisfactory or sufficient. The consistency of visibility was not affected in (19/20). In all cases there were no adverse events. The technical examination and clinical application of the disposable endoscope are of equal quality compared to reusable devices. Disposable endoscopes can be an alternative to reusable devices, but economic aspects such as reduction of repair costs, sterilization effort and additional waste must be taken into account.

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Section: Discussionmentioning

confidence: 99%

Comparative investigation of reusable and single–use flexible endoscopes for urological interventions

Eisel

Strittmatter

Ströbl

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…A fully automatic distortion correction method, which also embeds the radial distortion parameter into the Hough transform for a better detection of straight lines, is presented in Lee et al [19]. It is applied to endoscopic images captured with a wide-angle zoomable lens.…”

Section: Introductionmentioning

confidence: 99%

An Iterative Optimization Algorithm for Lens Distortion Correction Using Two-Parameter Models

Santana-Cedrés¹,

Gómez²,

Alemán‐Flores³

et al. 2016

Image Processing on Line

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We present a method for the automatic estimation of two-parameter radial distortion models, considering polynomial as well as division models. The method first detects the longest distorted lines within the image by applying the Hough transform enriched with a radial distortion parameter. From these lines, the first distortion parameter is estimated, then we initialize the second distortion parameter to zero and the two-parameter model is embedded into an iterative nonlinear optimization process to improve the estimation. This optimization aims at reducing the distance from the edge points to the lines, adjusting two distortion parameters as well as the coordinates of the center of distortion. Furthermore, this allows detecting more points belonging to the distorted lines, so that the Hough transform is iteratively repeated to extract a better set of lines until no improvement is achieved. We present some experiments on real images with significant distortion to show the ability of the proposed approach to automatically correct this type of distortion as well as a comparison between the polynomial and division models. Source CodeThe source code, the code documentation, and the online demo are accessible at the IPOL web page of this article 1 In this page, an implementation is available for download. Compilation and usage instructions are included in the README.txt file of the archive.

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“…A fully automatic distortion correction method, which also embeds the radial distortion parameter into the Hough transform to better detect straight lines, is presented by Lee et al [14]. It is applied to endoscopic images captured with a wide-angle zoomable lens.…”

Section: Introductionmentioning

confidence: 99%

Automatic Lens Distortion Correction Using One-Parameter Division Models

Alemán‐Flores¹,

Álvarez²,

Gómez³

et al. 2014

Image Processing on Line

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We present a method to automatically correct the radial distortion caused by wide-angle lenses using the distorted lines generated by the projection of 3D straight lines onto the image. Lens distortion is estimated by the division model using one parameter, which allows to state the problem into the Hough transform scheme by adding a distortion parameter to better extract straight lines from the image. This paper describes an algorithm which applies this technique, providing all the details of the design of an improved Hough transform. We perform experiments using calibration patterns and real scenes showing a strong distortion to illustrate the performance of the proposed method. Source CodeThe source code, the code documentation, and the online demo are accessible at the IPOL web page of this article 1 . In this page, an implementation is available for download. Compilation and usage instructions are included in the README.txt file of the archive.

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Automatic Distortion Correction of Endoscopic Images Captured With Wide-Angle Zoom Lens

Cited by 24 publications

References 27 publications

Comparative investigation of reusable and single–use flexible endoscopes for urological interventions

Comparative investigation of reusable and single–use flexible endoscopes for urological interventions

An Iterative Optimization Algorithm for Lens Distortion Correction Using Two-Parameter Models

Automatic Lens Distortion Correction Using One-Parameter Division Models

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