快速离焦投影三维测量技术

随着数字投影技术的发展,基于投影的三维面型测量技术在多种场合得到广泛应用。基于相移的结构光投影测量技术以其算法简便精度较高得到较快发展。但投影仪为非线性仪器,会影响强度变化,进而影响相位测量精度;此外由于投影仪工作原理的投影速度受到限制。离焦投影技术的出现为高速测量和高精度测量提供了新的方法。总结了目前国内外对离焦投影技术的研究现状;从投影工作原理、相移算法、解包裹算法、误差补偿、条纹调制、标定技术及离焦投影技术的相关技术细节进行全面介绍,为数字离焦投影三维测量工作的研究提供参考。

High speed 3-D shape measurement using projector defocusing

With the rapid growth of DLP projection technology in the late years, DLP projection technology has been gradually applied to numerous disciplines. Phase shifting method often works with DLP projection technology due to its flexibility and high precision. As a non linear instrument, the projector could hardly project ideal fringe patterns, and could hardly achieve high projection speed. The binary defocusing provides a new solution for high speed and high precision measurement. This paper analyses the current status and development trend of 3 D shape measurement by using projector defocusing at home and aboard. A survey is presented for the working principle of DMD, phase shifting algorithms, unwrapping algorithms, error compensation methods, the modulating methods for fringe pattern, the calibration methods and some of the details about projector defocusing further. This work can provide references for the researchers engaged in 3 D shape measurement by using projector defocusing.