The 3-D measurement methods based on fringe projection intensity adjustment (FPIA) have been widely adopted to measure the multireflectivity scenes. However, the signal-to-noise ratios (SNRs) of the captured fringe patterns in the FPIA-based methods are reduced because of a large range of reflectivity variations (LRRVs). In our research, a reflection model and a crosstalk model are built to analyze the disturbances induced by LRRVs on the SNRs in the captured fringe patterns, and then, a 3-D measurement method based on nonlinear FPIA (NLFPIA) is proposed to alleviate the LRRV-induced disturbances and improve the measurement accuracy. Moreover, to improve the efficiency of the proposed 3-D measurement method, we present a cyclic utilization of fringe patterns (CUFPs) technique to decrease the number of projection patterns. Experimental results show that the proposed NLFPIA-based 3-D measurement method reduces the root-mean-square error (RMSE) in the measurements of the two standard ceramic geometries by 52.9845% and 36.6393% compared with the FPIA-based method.

中文翻译：

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基于非线性条纹投影强度调整的多反射场景3D测量方法

基于条纹投影强度调整（FPIA）的3-D测量方法已被广泛用于测量多反射场景。然而，由于反射率变化 (LRRV) 的范围很大，因此在基于 FPIA 的方法中捕获的条纹图案的信噪比 (SNR) 会降低。在我们的研究中，我们建立了反射模型和串扰模型来分析 LRRV 对捕获的条纹图案中的 SNR 引起的干扰，然后提出了一种基于非线性 FPIA (NLFPIA) 的 3-D 测量方法来缓解这种干扰。 LRRV 引起的干扰并提高测量精度。此外，为了提高所提出的 3-D 测量方法的效率，我们提出了条纹图案 (CUFP) 技术的循环利用，以减少投影图案的数量。