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Automatic processing in moire deflectometry by local fringe direction calculation

机译:通过局部条纹方向计算在莫尔折光法中进行自动处理

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An algorithm for accurately extracting the local fringe direction is presented. The algorithm estimates, in the neighborhood of n x n points, the direction of the gradient that points normal to the local Fringe direction. The performance of four different derivative kernels is also compared. Since this method is sensitive to noise and variations in background and amplitude, a preprocessing step is used to limit these error sources. The method has been applied to the moire deflectogram of a spherical and a progressive addition ophthalmic lens, resulting in a map of the refractive power of these lenses. The results are compared with the data obtained with a commercial focimeter. This technique is useful for analyzing the fringe patterns where the fringe direction is variable and must be obtained locally. (C) 1998 Optical Society of America. [References: 10]
机译:提出了一种精确提取局部条纹方向的算法。该算法在n x n个点的附近估计垂直于局部Fringe方向的渐变方向。还比较了四个不同派生内核的性能。由于此方法对噪声以及背景和幅度的变化敏感,因此使用预处理步骤来限制这些误差源。该方法已应用于球面和渐进式眼镜片的莫尔条纹偏转图,从而得出了这些镜片的屈光力图。将结果与使用商用聚焦计获得的数据进行比较。该技术对于分析条纹方向可变且必须局部获取的条纹图案很有用。 (C)1998年美国眼镜学会。 [参考:10]

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