Image preprocessing for particle holograms

Yulong Cao; Lei-Jian Liu; Jingyu Yang; Sun Bo

doi:10.1117/12.163753

2 December 1993 Image preprocessing for particle holograms

Yulong Cao, Lei-Jian Liu, Jingyu Yang, Sun Bo

Proceedings Volume 2005, Optical Diagnostics in Fluid and Thermal Flow; (1993) https://doi.org/10.1117/12.163753
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

Since particle holograms are capable of the instantaneous recording of 3D field particle, a lot of holographic recording and analyzing systems have been developed for various particle field analysis applications. This presentation describes an image pre-processing for particle holograms. First, a directed graph (DG) is defined and converted from a image. Second, four types of vertex are defined according to the relationships among vertexes in DG, then a gradient flowing graph is constructed from DG to obtain a set of gradient demarcation vertexes (DGV). Finally, the gradient dividing line is generated by the set of DGV, and the region of interesting (ROI) including particles and fewer noises is obtained; the histogram of ROI has more obvious bi-peak character than that of whole image. Therefore, it is easy to select thresholds for generating binary image and to obtain basic parameters on particles.

Citation Download Citation

Yulong Cao, Lei-Jian Liu, Jingyu Yang, and Sun Bo "Image preprocessing for particle holograms", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); https://doi.org/10.1117/12.163753

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