三維外形量測之彩色條紋投射順序設計

本文研究不同的彩色條紋投射順序對於物體的外形量測之影響，以及提出一套簡易的色彩校正方法用以降低彩色耦合效應和彩色不平衡效應產生的色彩誤差。首先，設計三種不同的投射條紋圖樣，包括基本投射順序、不規則投射順序以及規則投射順序來進行三維量測的比較；可發現規則投射順序的重建結果能有效的降低相位誤差並提升量測品質。再者，將紅綠藍三色彩通道之光強度範圍各自做調整來降低彩色耦合效應及彩色不平衡效應，可突破非白色物體的量測限制。最後以Visual .NET C++語言整合分析程式，此程式結合相位移、相位壓縮、相位展開之步驟。利用此程式，測試數個量測範例。由結果可發現，使用規則投射順序的光柵條紋以及各自調整色彩光強度能有效提升三維量測的重建品質。

關鍵字

外形量測；數位條紋投射法；相位移法；相位展開；彩色耦合效應；彩色不平衡效應

並列摘要

This thesis studies the effect of different color fringe projection sequences for 3D shape measurement of objects. A novel color correction method is also presented for reducing the image color errors induced from color coupling effect and color imbalance effect. First, three sequences of projected fringe patterns, including basic projection sequence, disordered projection sequence and ordered projection sequence, are designed. Effects of these three projection sequences on the quality of measured 3D object shapes are compared. It is found that the ordered projection sequence can reduce the phase errors effectively and improve the quality of the shape reconstruction results. Then, the image color intensity ranges for the red, green and blue color channels are adjusted respectively such that the color coupling effect and color imbalance effect can be reduced. The adjusted color intensities will also result in a breakthrough for measurement non-white object surfaces. Finally, an integrated program is developed in Visual .NET C++ by combining phase-shifting, phase-wrapping, and phase-unwrapping algorithms. 3D shapes of test objects are measured by this integrated program. From the research results, it shows that the reconstruction quality of the 3D shapes is improved by using the proposed ordered projection sequence and the respectively adjusted color intensities.

並列關鍵字

shape measurement ； digital fringe projection ； phase shifting ； phase unwrapping ； color coupling effect ； color imblance effect

參考文獻

[46] 黃文昭，三維外形量測之非線性數位條紋誤差校正，國立台灣大學機械工程研究所碩士論文，2006。

[2] T. T. Chung and C. Y. Liao, “An integrated scanning system for reconstructing 3D color models of general objects,” Proceedings of the 2005 IEEE International Conference on Mechatronics, 2005.

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[4] Y. S. Chen and B. T. Chen, “Measuring of a three-dimensional surface by use of a spatial distance computation, ” Applied Optics, vol.42, no.11, pp.1958-1972, 2003.

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三維外形量測之彩色條紋投射順序設計

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