考虑单层折射模型的偏转测量系统的LCD屏幕校准

Daniel Maestro-Watson, A. Izaguirre, N. Arana-Arexolaleiba
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引用次数: 3

摘要

基于偏转测量的技术通过在LCD屏幕上显示一系列图案,并使用相机观察它们在表面上的反射,从而提供镜面上的绝对形状测量。这些技术可以提供精确的测量,但容易产生校准误差。屏幕的外部校准是校准过程中的一个关键因素,通常基于平面模型,这没有考虑到LCD屏幕透明层中发生的折射。几位作者已经表明,单玻璃层模型可以减少测量误差,但两个参数并不总是可用的:折射率和LCD屏幕的折射层厚度。在这项工作中提出的方法允许这两个参数的实验计算,考虑到屏幕的非平坦形状。在液晶显示器的前表面放置一系列标记,并使用坐标测量机来获得其形状。额外的虚拟标记显示在屏幕上,并通过校准的相机从不同位置和方向观察。捕获的图像显示由于折射导致的显示特征的视相关位移。应用摄影测量技术将图像中观察到的位移与测量的前表面联系起来,并采用数学最小化算法估计LCD屏幕参数。通过几个仿真实验来评估该方法,包括测量误差的影响。结果表明了该方法的可行性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
LCD screen calibration for deflectometric systems considering a single layer refraction model
Techniques based on deflectometry provide absolute shape measurements on specular surfaces by displaying a series of patterns on an LCD screen and using a camera to observe their reflection on the surface. These techniques can provide accurate measurements, but are prone to calibration errors. The extrinsic calibration of the screen, a key element in the calibration process, is often based on a flat surface model, which does not account for the refraction that occurs in the transparent layers of the LCD screen. Several authors have shown that a single glass layer model can reduce measurement errors, but two parameters that are not always available are needed: the index of refraction and the thickness of the refractive layer of the LCD screen. The method presented in this work allows the experimental computation of both parameters, taking into account the non-flat shape of the screen. A series of markers are placed on the front surface of the LCD and a coordinate measuring machine is employed to obtain its shape. Additional virtual markers are displayed on the screen and observed with a calibrated camera from different positions and orientations. The captured images show view-dependent displacements of the displayed features due to the refraction. Photogrammetric techniques are applied to relate the displacements observed in the images and the measured front surface, and a mathematical minimization algorithm is employed to estimate the LCD screen parameters. Several simulation experiments are performed to evaluate the approach, including the influence of measurement errors. The results indicate feasibility of the method.
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