研究目的
Comparative appraisal of global and local thresholding methods for binarisation of o?-axis digital holograms
研究成果
The clustering-based methods achieved the highest quality in binarisation of o?-axis digital holograms. The results of binarisation by global and local methods were comparable on average. The study provides a foundation for selecting appropriate thresholding methods for fast digital hologram binarisation for storage, transfer, or use in DMD applications.
研究不足
The study did not explore the impact of different types of objects or hologram recording conditions on the effectiveness of the thresholding methods. Additionally, the computational efficiency of the methods was not thoroughly analyzed.
1：Experimental Design and Method Selection:
The study analyzed and compared 12 local and 18 global thresholding techniques for binarisation of optically recorded o?-axis digital holograms. The methods were categorized based on attribute similarity, clustering, entropy, histogram shape, and local adaptive factors.
2：Sample Selection and Data Sources:
Optically recorded o?-axis digital holograms of different objects were used. The digital holograms had 2048 × 2048 pixels with a pixel size of 9 μm × 9 μm.
3：List of Experimental Equipment and Materials:
Digital holograms were recorded using photo and video cameras with digital photosensors (CMOS, CCD, Foveon X3, etc.).
4：Experimental Procedures and Operational Workflow:
The holograms were binarised using the selected thresholding methods. The amplitude quality of the reconstructed images was compared using PSNR and SSIM values.
5：Data Analysis Methods:
The quality of reconstruction was measured using peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM).
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