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In the development of a three-dimensional measurement system, binocular stereo matching is the most important and difficult. In the basis of introducing selective principles of matching algorithm, a new stereo matching algorithm for binocular vision is put forward that is named noncoded difference measuring distance. The algorithm effectively grapples with the problem of searching for the coincidence relation of raster and can efficiently and accurately obtain three-dimensional world coordinates of the entities. Experiment results show that this 3D measuring machine can effectively measure the 3D solid profile of free surface. During the evaluation test for accuracy, scan a standard plane. Fit all 3D points in one plane, and then the flatness value of this plane is obtained. The flatness value of the standard plane has been ultimately measured as: ± 0.0462mm, this measuring accuracy can completely satisfy the requirements of rapid prototyping or CNC machining, it as well as achieves the stated accuracy (± 0.05mm).

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The measurement of body contours grating fringe projection technology is the three-dimensional measurement of a hotspot. Basic principle is to be tested based on grating projection three-dimensional object shape; key technology is to enable the generation of sinusoidal grating projection stripes projected onto the measured object. Theoretical sinusoidal intensity stripes should be a phase grating, but such grating is difficult and costly. Therefore, this paper structure of smooth three-dimensional measurement system, the core scanning devices-grating, through the characterization method to design a production, and enable it to project a stripe of light intensity by the sine distribution is given the experimental results. From the start of the study to refine and perfect the final three stages, each stage is accompanied by a large number of experiments. Using Fresnel-Kirchhoff formula. The overall structure of the grating design and the gradual improvement，Achieved good results, And proposed future research ideas and program，Also gives the experimental data and results.