Non-contact Body Measurement System

The design and production of clothes is entering into the moment of automatization and high-efficiency, with the development of technology of clothes CAD, the measurement of body dimension is already turned from the simple person-toutched method to non-contacting-automatic measurement . under the circumstance of contactlessness, how to acquire the related 3D-body dimension accurately and fast ,that is scientific research item investigateding by many enterprises, colleges and scientific institutions in our country and abroad.Today, body scanning has show a great proportion in providing 3D body automatic measurement, 3D scanning technology is now widely accepted for product design and development, 3D body scanners have distinct features and advantages, they can be grouped under four main categories: laser, infrared, structure light and photogrammetry. the production that adapt these method are putted into the market partly, common obstacles faced by all the body scanners are high cost complicated installation, large space and dark room requirement etc.To these problem ,we use single CCD camera ,take the digital image of front and side body , calibrate 3D data, and acquire the different point's coordinates of 3D body .though the measurement of digital image, you can acquire the length of body and the 2D-dimension of width and thickness directly, then you can use the mathematical approach to establish the mathematical model, and evaluate the girth, turn the dimension of width and thickness to the accordingly girth dimension . For the method of measuring the body directly and making clothes ,the vital statistics parameters(bust girth, waist girth and hip girth) must be measured, the three parameters are the necessary base for determining the clothes mark, because they can reflect various bodies basically. In a word, acquiring the vital statistics parameters accurately is the key of the measure method.The paper analyses and researches quantitative the vital statistics cross-section curvegraph of young women, establish the curve evaluating project-adopt logarithm function toevaluate the curve of the vital statistics, and calculate the basic dimension of the vital statistics though integral calculus . The level of precision attains to the demand of clothing-design already., So the body's data change of 2D to 3D accomplishes preliminarily.In the procedure of acquiring the information of image, the device of CCD camera is used widely to take the body's digital image .The photographic lens makes the spatial object the perspective image. If measure the parameters of body at the perspective image directly, there is error of measurement , but before measurement, you change the perspective image to projective image, then you are able to decrease the error . According to the experiment and theory of geometric optical photography , the paper puts forward the mathematical model andmethod of conversion. Though the analysis of the image taked experimentally, you will also find geometry distortion in the process of optical photography. The paper analyzes the cause of geometry distortion, According to the experiment and theory of optical photography , the paper puts forward the mathematical model and method of rectify .For the fulfillment of the systematic work, the system is made up of background illuminant, frame of calibrate, CCD camera ,computer and printer. The entity of the system has many advantages, for example: simple manipulation, the fast calculation ,the cheap cost of the device, the small space, the convenient usage.