Optics 2015; 4(3-1): 24-28 Published online August 6, 2015 (http://www.sciencepublishinggroup.com/j/optics) doi: 10.11648/j.optics.s.2015040301.16 ISSN: 2328-7780 (Print); ISSN: 2328-7810 (Online) Virtually and Depth Sensor Generated Moire Pictures in Screening and Treatment of Scoliosis Akos Antal, Attila Katona, Peter Major, Jozsef Molnar, Norbert Szakaly, Peter Tamás, Klara Wenzel Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Budapest, Hungary Email address: akos@mogi.bme.hu (A. Antal), mesteratila@gmail.com (A. Katona), axodox@outlook.com (P. Major), joe@mogi.bme.hu (J. Molnar), szakaly@mogi.bme.hu (N. Szakaly), tamas@mogi.bme.hu (P. Tamas), wenzel@mogi.bme.hu (K. Wenzel) To cite this article: Akos Antal, Attila Katona, Peter Major, Jozsef Molnar, Norbert Szakaly, Peter Tamas, Klara Wenzel. Virtually and Depth Sensor Generated Moiré Pictures in Screening and Treatment of Scoliosis. Optics. Special Issue: Academic Research for Multidisciplinary. Vol. 4, No. 3-1, 2015, pp. 24-28. doi: 10.11648/j.optics.s.2015040301.16 Abstract: In this paper, different moiré picture generation techniques are presented. This paper presents the basics of moiré effects, a virtual way of moiré generation, depth sensor based moiré picture generation and usage. One of the most common advantages of these methods is rapidity. The computer generated moiré pictures provide an opportunity of screening diagnosis. The depth sensor generated moiré fringes are precise and easy to process. A neural network based reconstruction of vertebral supports both the screening diagnosis and the treatment of scoliosis. Keywords: Moiré, Depth Sensor, Screening of Scoliosis, 3D Model of Vertebral 1. Introduction Surface reconstruction is one of the most important topics in computer vision due to its wide field of application. Some examples of application are range measuring, industrial inspection of manufactured parts, object recognition and three-dimensional (3D) map rebuilding. There are several different techniques that can be used for optical 3D measurements on object surfaces, such as interferometry, stereovision, coded structured light and moiré methods. These techniques are based on both contact and non-contact procedures and present different sensitivities. The moiré phenomenon can be observed when superimposing two periodic or quasi-periodic structures. When the two structures have the same or slightly different line spacing and their lines are set approximately parallel, a new coarse pattern appears. This pattern is called a moiré fringe pattern. The spacing and orientation of the moiré fringes depend on the spacing and orientation of the structures being overlapped whereas the visibility of fringes is related to the width of transparent or black lines with respect to the line spacing of the structures [1]. Figure 1. shows a moiré pattern caused by two straight-line gratings with different frequencies tilted with respect to one another. Figure 1. Moiré pattern caused by two straight-line gratings with different frequencies tilted with respect to one another. The moiré technique is a method commonly used in various medical applications. In dental clinics, F.R. Wouters et al. used moiré phenomenon to examine gum swellings caused by dental implants [2]. Richard Smith et al. applied it in the improvement of the dimensional accuracy of tooth implants [3]. In plastic surgery, Sungyeon Ahn et al. developed a special grating to quantify the elasticity of human skin based on moiré strain analysis [4]. Tetsuo Kawara defined the topography of human cornea by forming the grating with a special fluid. He was able to reach a 5 µm resolution, and the method was useful in examining corneal deformities caused by cataract operations.