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http://dx.doi.org/10.17661/jkiiect.2020.13.5.331

An Implementation of Smart E-Calipers for Mobile Phones  

Yun, Han-Kyung (School of Computer Science and Engineering, Korea University of Technology and Education)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.13, no.5, 2020 , pp. 331-337 More about this Journal
Abstract
The study is underway with the goal of developing an app that will replace vernier calipers using a smartphone's high-performance camera. The specifications of the camera mounted on recent smart phones have evolved so that usually has a 12 Mpixels of image sensor and its size of the pixel is 1.4㎛ and the size of the image sensor is 1 / 2.55 in. The proposed algorithm will apply to develop a precision measuring application that will compete with the Vernier calipers. Most existing applications cannot guarantee an accuracy in scale because the scale of the ruler displayed on the image is unclear or the size of the measurement object varies depending on the distance between the camera and the measurement object. In addition, another accurate measuring tools using lasers are also available, but they are limited because they are expensive. Therefore, if easy-to-carry and precise applications are developed, it is possible to substitute existing measurement tools. The proposed correction algorithm is an algorithm that automatically corrects the distorted source image using the shape and size information of the known template. The e-calipers are applications that display the distance when the area to be measured is specified in the corrected image.
Keywords
edge extraction; geometric attribute; length measuring; square template; e-calipers;
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