Research Of Several Pivotal Technology On Cross-sectional Imaging Reverse Measurement System

In the reverse engineering techniques, object's measurement is its foundation. Existing measurement techniques can not obtain the shape data of both exterior and interior surfaces and regions of an object with higher accuracy. Cross-section Imaging Measurement simultaneously digitizes both exterior and interior surfaces of a part, a full data geometry model of a part can be constructed. The technique helps to shorten the design-to-manufacture time and reduce the cost of the product. In order to improve the accuracy further, the paper makes research on the several of critical techniques in the Rapid Reverse Engineering (RRE) system.A kind of special encasing material is developed and used to reinforce the part in the project, which can compound different color according to different requirement .It provides obvious gray scale contrast between the image of part and encasing material and it can obtain the accurate contour of a part's cross section. This kind of material has good machinability, additives and proper toughness. The whole encasing process is simple and rapid.The paper improves the design of photography system of capturing cross-section image and guarantees the steady capturing of image. It adapts several of measures and projects, which carry out automatic measurement on orientation photography, eliminating crumb, image stitching of entire measure system. Moreover, the paper make research on the arithmetic disposal of image and data in the entire process from digital image to layer vector data of part, and improve it further and realize these arithmetic by soft.Through the analysis of mapping relation between pixel point and a point of space, the paper pose a demarcate method based on grid interpolation. This method transform complicate nonlinear problem to many little regional linear problems and realizeemendation on problems of linear and nonlinear deformation in image. The algorithm is simple and rapid and advance precision of measurement system obviously.The system is of simple configuration and of convenience equipment installation and low cost. It can measure both exterior and interior contour shape of a part conveniently and has abroad applying foreground.