Abstract
This paper proposes a new multiple three-step color phase-shifting method for measuring 3D shape of objects. Firstly, multiple color fringe patterns are designed and projected onto the object surface by a projector. Distorted fringe patterns on the object surface are captured by a digital camera, and intensities of each pixel in the red, green and blue channels are obtained from the captured color images. Phase values of all pixels are calculated by the phase-shifting method from the obtained RGB intensities. Then, the phase-unwrapping technique is applied to convert phase values to the height of the object surface. Finally, an integrated program is developed by combining phase-shifting process and phase-unwrapping process. With the developed program, several measurement examples are investigated. From the measurement result, it shows that better 3D shape results can be obtained from the proposed method.
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