Method for measuring distortion in wide-angle video channels

A New Method for Measuring the Angle of Hallux Valgus

Objectives. The aim of this study is to introduce a new way and assign its reliability and validity in measuring the angle of hallux valgus. Methods. In this method, we have proceeded to introduce a simple way for measuring the angle of hallux valgus by using ruler and mathematical formulas. For doing this study, we selected 25students and measured their angle of hallux valgus with new way ...

A Novel Method for Measuring, Regardless of Image Distortion and Lens Varying Specifications in Endoscopic Treatment of Vesicoureteral Reflux

Reliability of Body Landmarks Analyzer for Measuring the Quadriceps Angle

Genovarum and Genovalgum are the most common postural deformities of the knee joint. A quadriceps angle is used to measure these anomalies. Methods of measuring this angle are divided into two categories: invasive and non-invasive. The purpose of the present research was to study the inter/intra rater reliability of the non-invasive Body Landmarks Analyzer method for measuring of the quadriceps...

Wide-Angle Lens Distortion Correction Using Division Models

In this paper we propose a new method to automatically correct wide-angle lens distortion from the distorted lines generated by the projection on the image of 3D straight lines. We have to deal with two major problems: on the one hand, wide-angle lenses produce a strong distortion, which makes the detection of distorted lines a particularly difficult task. On the other hand, the usual single pa...

Interferometric method of measuring plotter distortion.

The authors are with the Itek Corporation, Lexington, Massachusetts 02173. Received 25 September 1973. In this letter an interferometric method of measuring plotter distortion is described. A common method of measuring plotter distortion is to draw a known pattern, such as straight lines, and scan this pattern with a microdensitometer. This is a precise method of measuring distortion; however, ...