Abstract
In the fast three-dimensional (3-D) shape measurement, it is an important factor to use the least number of the fringe pattern to get 3-D shape measurement of arbitrary objects. Although one-shot technologies can use one-frame deformed fringe pattern to get the wrapped phase, they are easily affected by the surface property and suffer from poor spatial resolution. In addition to the process, phase unwrapping may affect the quality of absolute phase. This paper proposes a fast measurement method based on a phase measurement profilometry and stereo vision system. This method can reconstruct 3-D surface without phase unwrapping. Using original image matching constraint, a rough parallax is used in the phase matching. To resist the false matching, subpixel parallax optimization is used to reduce the matching errors. To detect the edge point of wrapped phase, the average phase is calculated. Experimental results verify the feasibility of the proposed method and it can measure complex objects without phase unwrapping.
Highlights
High-speed three-dimensional (3-D) shape measurement has been an important technology in industrial manufacturing, such as quality inspection, reverse engineering, 3-D sensing, and object recognition.[1]
Fourier transform is insensitive to the color, but it needs the extract from the fundamental frequency component, so the geometry changes are required to be lower than the frequency of the fringe pattern.[15]
The computational cost is high and the measurement accuracy needs to be improved. Another problem is that the wrapped phase needs to be unwrapped to obtain the absolute phase; the process of the phase unwrapping will affect the accuracy of absolute phase and it will increase computing time of the measurement.[17]
Summary
High-speed three-dimensional (3-D) shape measurement has been an important technology in industrial manufacturing, such as quality inspection, reverse engineering, 3-D sensing, and object recognition.[1]. It is significant to use fewer fringe patterns to get the results in a high-speed measurement.[10] Because oneshot technologies only need one frame to get the wrapped phase, they have the potential to be used in high-speed measurement It mainly contains color coding,[11] FTP,[12] and composite pattern;[13] these methods still have shortcomings. Color coding is encoded with different colors It is affected by the surface color.[14] Fourier transform is insensitive to the color, but it needs the extract from the fundamental frequency component, so the geometry changes are required to be lower than the frequency of the fringe pattern.[15] Composite pattern with different frequencies is projected and different frequencies are filtered to obtain the deformed patterns with different frequencies.[16] the computational cost is high and the measurement accuracy needs to be improved.
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