Abstract
In the course of studies on the problem of restoring hands relief, using the de Bruijn structured illumination, methods of solving this problem are proposed. This is a method of simple quantitative detection of Hough segments on the skin of the hand, a method of qualitative visual evaluation of the effectiveness of the color palette using the dominant color, and a method of the weight coefficients of the components of the color palette. The proposed methods make it possible to quantitatively determine the optimal choice of the color scheme for generating the de Bruijn bands when illumination of the hand, to restore its relief. The work describes the stages of this study, led from visual observation to a full quantitative calculation of the quality of calibration illuminations, with the possibility of their optimal choice. In the course of experiments and observations, the requirements for the technical support of research were developed to achieve the best quality of the images of the hands. Also, the paper presents a high-speed de Bruijn sequence generating algorithm using Lyndon's words, which excludes the search for Euler chains or Hamiltonian cycles, for various kinds of de Bruijn graphs. With its help, the generation of structured light patterns with various color schemes was carried out, with the purpose of further analysis of their use in 3D reconstruction systems of hands.
Highlights
To date, in the problems of scanning volumetric surfaces, many different variants of patterns of structured illumination have been developed
The aim of research is studying the behavior of the de Bruijn bands on the hand, with the possibility of choosing the optimum color palette for structured illumination using the weighting method
Weighting coefficients are displayed in the Statistics field of the application. This approach does not require the use of the OpenCV library
Summary
In the problems of scanning volumetric surfaces, many different variants of patterns of structured illumination have been developed. De Bruijn sequence of order m in the alphabet of n symbols is a circular sequence of length n^m that contains any substring of length m only once This sequence is used, in particular, in systems for recording 3D objects in real time (3D scanners) using structured illumination. The aim of research is studying the behavior of the de Bruijn bands on the hand, with the possibility of choosing the optimum color palette for structured illumination using the weighting method. This will allow the most qualitative restoration of the three-dimensional relief of the hand for further use in 3D scanning systems, in particular, in systems for recognizing gestures. As a result of correctly selected color sets in the illumination patterns, minimal mutual influence of the components of the entire color scheme is provided and overall recognition accuracy is increased
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