Department of Electrical Engineering, University of Kentucky, Lexington, KY 40507, USA.
IEEE Trans Image Process. 2011 Nov;20(11):3001-13. doi: 10.1109/TIP.2011.2155072. Epub 2011 May 19.
Phase shifting structured light illumination for range sensing involves projecting a set of grating patterns where accuracy is determined, in part, by the number of stripes. However, high pattern frequencies introduce ambiguities during phase unwrapping. This paper proposes a process for embedding a period cue into the projected pattern set without reducing the signal-to-noise ratio. As a result, each period of the high frequency signal can be identified. The proposed method can unwrap high frequency phase and achieve high measurement precision without increasing the pattern number. Therefore, the proposed method can significantly benefit real-time applications. The method is verified by theoretical and experimental analysis using prototype system built to achieve 120 fps at 640 × 480 resolution.
相移结构光照明用于距离感测，涉及投影一组光栅图案，其准确性部分取决于条纹的数量。然而，高图案频率在相位解缠过程中引入了模糊性。本文提出了一种在不降低信噪比值的情况下将周期提示嵌入到投影图案集中的方法。因此，可以识别高频信号的每个周期。所提出的方法可以解缠高频相位并实现高精度测量，而无需增加图案数量。因此，该方法可以显著受益于实时应用。该方法通过使用原型系统进行理论和实验分析得到验证，该原型系统在 640×480 分辨率下实现了 120 fps 的帧率。
