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Characterization of particles suspended in a volume of optical medium at high concentrations by coherent image processing

机译：通过相干图像处理表征高浓度悬浮在一定体积的光学介质中的颗粒

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We give a broad discussion of existing typical works devoted to particle image processing. We propose the approach based on the postprocessing of coherent images of the particles at various planes of the volume. These images can be obtained both by reconstruction of inline digital hologram and by means of defo-cussing of the lens with high numerical aperture. Processing of the reconstructed holograms or recorded images is carried out using the proposed image analysis approach based on the edge-point linking and thresholding technique, which is considered to be simple to implement and reliable. After the review of existing methods and approaches, we noted that, in general, only cases of low concentrations are considered and, therefore, we investigated the performance of our proposed approach for characterization of particles of high density in a volume of optical medium. In this study of the method, we increase the concentration of particles until we ensure that every volume element comprises many particle images, yet these images do not create a speckle pattern, and look for the concentrations at which normalized density distributions of the particles can be constructed with an acceptable error for us. It is shown that the proposed approach exhibits good results of recognition and allows investigation of high concentrations.
机译：我们对专门用于粒子图像处理的现有典型作品进行了广泛的讨论。我们提出了基于粒子在空间的各个平面上的相干图像的后处理方法。这些图像既可以通过重建数字全息图获得，也可以通过对具有高数值孔径的镜头进行散焦来获得。使用提出的基于边缘点链接和阈值技术的图像分析方法对重构的全息图或记录的图像进行处理，该方法被认为易于实现且可靠。在审查现有方法和方法后，我们注意到，通常只考虑低浓度的情况，因此，我们调查了我们提出的方法在表征光学介质中高密度粒子方面的性能。在此方法的研究中，我们增加了粒子的浓度，直到确保每个体积元素都包含许多粒子图像，但是这些图像不会产生斑点图案，并寻找可以将粒子的归一化密度分布设为标准的浓度。对我们来说是可以接受的错误。结果表明，所提出的方法表现出良好的识别结果，并允许研究高浓度。

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