Human Body3D Reconstruction And Size Measurement Based On Kinect

3D human body model has broad prospects for using in fields like modern medicine, animation,game and virtual reality, and3D reconstruction technology has become a research hot spot. Underthis background, methods of3D reconstruction based on various theories and using differenttechnical approaches have been proposed, especially in developed counties such as the USA, Japanand Germany, several commercial3D scanning devices and systems have been pushed to themarket. Currently, most of mature3D reconstruction systems are based on laser or structure light,these systems are able to reconstruct3D human body with a high precision within millimeter oreven higher in several or dozens of seconds. Although these systems are fast and precise, they areusually large, complex, and difficult to deploy and operate, in addition, they are too expensive forordinary users. All these reasons have not only limited the promotion of the system itself, but alsorestricted the popularization of3D reconstruction technology. How to reconstruct3D human bodywith lower cost, higher speed and higher precision has become a hot but difficult problem duringthe research.As the Microsoft launched the Kinect depth camera, it has made a great progress in balancingbetween cost and availability. Kinect with features like small, portable, cheap and precise, providesa way to solve the problem above, and therefore it has gotten more and more attentions in the fieldof3D reconstruction. There have been some systems using Kinect to scan human body and acquire3D model. However, most of these systems are not precise enough to be used in lots of applications,some of these systems attempt to improve the precision by scanning repeatedly or using a iterationin the algorithm, although the precision of the final3D human body model becomes better, theefficiency of the systems themselves has been reduced.This paper aims to propose a new method of3D human body reconstruction with low-cost,high-efficiency and high-precision based on the Kinect depth camera. Due to the limitation ofKinect in the scanning scope and precision, a single Kinect can only reconstruct human bodypartially with a high precision. In order to obtain the whole human body with a high precision, wepropose a new method using two Kinect. The main work of this paper is as follows:(1) Research on the method of reconstructing3D human body model partially using a singleKinect, including three phases: acquisition of depth image, fusion of depth image and outputreconstruction result; Implement a reconstruction system based on the method.(2) Research on the method of reconstructing the whole3D human body model using two Kinects: two Kinects are used to scan the up and down half of human body and acquire the pointcloud data respectively, then the relationship between the pose of two Kinects obtained bycalibration and iterative closest point algorithm are used to complete the registration and build thewhole3D human body model; Implement a reconstruction system based on the method.(3) Proposing a new method of human body size measurement for3D point cloud body modelbased on Dijkstra shortest path algorithm: first constructing kd-tree structure from3D point cloudand searching each point for its neighbor point set, then connecting each point with all its neighborpoints to construct a structure of graph, finally, calculating the length of the shortest path betweenany two points in the graph using Dijkstra algorithm; Implement a body size measurement systembased on the method, the system is easy to use with real-time visualization and high precision.As the demand for3D human body model in various fields growing,3D reconstructiontechnology with low-cost, high speed and high precision is becoming more and more important.The reconstruction system based on Kinect depth camera proposed in this paper can meet thedemands and it is suitable for popularizing and utilizing. Furthermore, the body size measurementapplication described in this paper has made a exploration for the use of3D body model in textileand clothing design. Under the impulsion of3D reconstruction technology, the new technology willchange the traditional inefficient way of production and provide an inexhaustible motive force forthe rapid development of the industry.