点击次数：
论文类型：期刊论文
发表时间：2017-07-20
发表刊物：JOURNAL OF MODERN OPTICS
收录刊物：SCIE、EI、Scopus
卷号：64
期号：13
页面范围：1263-1269
ISSN号：0950-0340
关键字：Phase unwrapping; geometric constraints; dual-frequency
摘要：Conventional dual-frequency fringe projection algorithm often suffers from phase unwrapping failure when the frequency ratio between the high frequency and the low one is too large. Zhang et al. proposed an enhanced two-frequency phase-shifting method to use geometric constraints of digital fringe projection (DFP) to reduce the noise impact due to the large frequency ratio. However, this method needs to calibrate the DFP system and calculate the minimum phase map < at the nearest position from the camera perspective, these procedures are relatively complex and more time-consuming. In this paper, we proposed an improved method, which eliminates the system calibration and determination in Zhang's method, meanwhile does not need to use the low-frequency fringe pattern. In the proposed method, we only need a set of high-frequency fringe patterns to measure the object after the high frequencyis directly estimated by the experiment. Thus, the proposed method can simplify the procedure and improve the speed. Finally, the experimental evaluation is conducted to prove the validity of the proposed method. The results demonstrate that the proposed method can overcome the main disadvantages encountered by Zhang's method.