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Research of the automatic imaging focusing measurement for off-axisFresnel digital holography

机译：脱轴滤波器数字全息术自动成像对焦测量研究

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Digital holography technology, which adopt CCD digital camera to record holograph, can get amplitude and phaseinformation of the sample tested respectively through processing the image. Re-focus of the sample image can berealized by calculating complex amplitude information obtained. However, digital holograph reproduction system can'toffer any criterion which determine whether reproduction image achieve fixed-focus state when reproduction imagestands in the optimum position. Digital holography reproduction process need add an exterior criterion function, whichimplement automatic focus as normal imaging system. Aimed to digital imaging automatic focusing problem of off-axisFresnel holography, image gradient energy method, image Laplace energy method, image shade of gray variance methodare compared from two points of theory and practice view, and present the advanced measurement method based onspectrum band-stop filter. Experiment shows that the algorithm has some adaptability, especially image Laplace energymethod based on spectrum band-stop filter has non-skewness, monotonicity, unimodality, kurtosis and robust.
机译：数字全息技术，采用CCD数码相机录制全息图，可以通过处理图像来获得样品的幅度和正相信息。通过计算获得的复杂幅度信息，可以将样品图像的重新聚焦。然而，数字全息速再现系统不能脱离任何标准，该标准在最佳位置中再现ImageStands时，确定是否在再现图像实现固定焦点状态。数字全息再现过程需要添加外部标准功能，将其自动聚焦为正常成像系统。旨在数字成像自动聚焦问题的离轴阵挛全息，图像梯度能量法，图像拉普拉斯能量法，灰色方差的图像阴影与灰色方差法，从两个理论和实践视图相比，并提出了基于谱箱的高级测量方法筛选。实验表明，该算法具有一些适应性，特别是图像Laplace EnergyMethod基于频谱带停止过滤器具有非偏见，单调性，单倍性，峰氏和鲁棒。

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