The Optimization Of Meridian Visualization Based On Impedance And Binocular Vision

The Traditional Chinese Medicine(TCM)accounts that the human meridian adjusts the running of human vital energy and blood,and connects the inner organs with the body surface and others parts of body.People’s physiology changes can be reflected by certain electrical information on the human meridian.Therefore,positioning human meridian accurately,especially positioning it and make it visualization on the human body surface,has important application value for clinical diagnosis and TCM clinical basis teaching.However,positioning human meridian in TCM theory is mainly based on the subjective experience of doctors,which is lacking the support of objective theories and methods of scientific researches.Therefore,it is necessary to develop a method of detecting and positioning human meridian accurately and realizing real-time displaying.In order to detect the surface location of human meridian,the human meridian visualization system uses a muti-channels skin-resistance surveymeter to extract the body impedance and regards the points which have the lowest impedance as human meridian points by the characteristic of low impedance of human meridian.Secondly,paste the Optical Positioning Target(OPT)on the surface of electrode plate of skin-resistance surveymeter.As long as the OPT is positioned by the tracker,the 3-Dimensional(3D)coordinates of electrode probes can be computed according to the relative geometry information between the OPT and the electrode probes.Finally,the 3D coordinates of the human meridian should be merged into 2D graphics and then the meridian graphics and the images of human body captured in real-time fuse together.In this paper,we sum up the results which have got before,and optimize the system to improve the accuracy of the measurement.The key technology of binocular vision positioning system involves camera calibration,stereo matching and 3D coordinates computing.Based on the existing conditions,the paper uses a method with high precision called Zhang’s flexible new camera calibration method to calibrate camera.The method is simple,flexible and fast.According to the feature of OPT,the corner on the target are extracted at the level of sub-pixel precision by a optimal method based on Harris.Then basing on the characteristics of X corner,propose a matching algorithm which is based on the uniqueness and rotational invariance of target corner in stereo matching stage.The introduction of principle of motion estimation is used to reduce the range of corner-detection and improve the real-time nature of the system.At the process of 3D reconstruction,compute the information of X corners by the method called least square method based on the results of stereo matching.After the 3D information of the X corners are obtain,the electrode probes information can be got indirectly according to the relationship between X corners and electrode probes.Therefore,introduce the skin-resistance surveymeter can select the minimum impedance and pick out the meridian point through a cost function.At the process of image fusion,the method of pixel replace the original scene image and curve fitting principle are adopt to make the meridian and scene image fusion.The experiment has shown that the system based on impedance and binocular vision can position in a high precise level with small error under the current experiment condition.Based on the positioning system,the positioning and real-time display of meridian can be realized.