Temporal phase unwrapping is a method of analyzing fringe patterns in which the fringe phase, /spl Phi/, at each pixel is measured and unwrapped as a function of time, t. We propose a method for improving the signal-to-noise ratio of the total phase change by incorporating data from the intermediate phase values. The performance of the method is compared theoretical and experimentally, using data from a fringe projector based on a spatial tight modulator. The best way to use the method is with /spl Phi/ decreasing exponentially with time from its maximum value to zero; this provides significant improvements in reliability, accuracy and computation time compared with the original temporal unwrapping algorithm.


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    Title :

    Shape measurement of discontinuous objects using projected fringes and temporal phase unwrapping


    Contributors:


    Publication date :

    1997-01-01


    Size :

    660790 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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