Algorithm for markers detection on fringe images

Abstract

Abstract Thanks to non-contact scanning technology and its harmlessness to human health, the usage of numerous 3D scanners in various fields of medicine has considerably increased. For example, in orthopaedics, medical topographic system TODP uses structured light with fringe projection to determine the 3D relief of the dorsal surface of the trunk for the urgent task of diagnosing spinal deformities. To improve the accuracy of postural states analysis, anatomical landmarks of the skeletal bone structures are marked with high-contrast small-sized markers of the reflective film. Thus, the task of the marker’s detection in the image appears. The article discusses the algorithms for detection of small-sized bright markers in fringe images, obtained by the computer optical topography method. The experimental results have shown that the proposed algorithm can detect 99.94% of the reflective markers in a sample of 1000 images with 8350 markers in total.