A new phase unwrapping algorithm is proposed based on temporal phase unwrappping. Given a series of wrapped phase maps generated from different fringe periods, a jump mask (or matrix) was introduced which reveal the 2π phase jump between successive levels. Using this jump mask, a series of wrapped phase can be unwrapped by summing up integers in specific column of the mask. The summation of the integers is the total multiple of 2π phase jump between wrapped and unwrapped phase. Deduction of the mask, practical experiment and discussion are carried out in detail. This method can measure discontinuity in object and accelerates the phase unwrapping procedure.
Crossed-optical-axes project grating system is fundamental architecture in 3-D profilometry measurement. Confined by three conditional constraints, it has some limitations in practical application. An improved system relieving the constraints was proposed here. Geometrical deduction based on image ray tracing, optical triagulation and pinhole model was carried out. By projecting another central line fringe as the zero-phase datum, wrapped phase map about reference or measured object could be unwrapped without inducing systematic errors. The simulation was to measure a plate
with a height of 80mm when changing geometrical parameters. Compared with the conventional configuration, new system approves more flexibility and maneuverability.
The measurement of geometrical parameters using image measurement technology is used widely in the industrial test and measurement. Usually a work-piece is measured mostly by a larger aperture system, whose aperture is not smaller than the work-piece. To a large work-piece, however, it is not practical to make so large an aperture and to keep accurate. A novel method named One Point and One Line (OPOL) working on 2D image connection is proposed here, through which parts of images about the work-piece sampled at first can be connected by the computer so that a total image containing abundant information should come into being. And on the basis of the total image, all of the measuring tasks are carried out quickly and efficiently by pre0established manmade feature objects and implementing subpixel analysis based on polynomial interpolation and polyfitting.
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