2D reconstructed-image restoration of terahertz Gabor in-line digital holography
| Autor: | 胡佳琦 Hu Jiaqi, 李琦 Li Qi, 杨永发 Yang Yongfa |
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| Rok vydání: | 2014 |
| Předmět: |
Terahertz radiation
business.industry Noise reduction Holography Image processing Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention law Histogram Image noise Computer vision Artificial intelligence business Image restoration Digital holography Mathematics |
| Zdroj: | Optics and Precision Engineering. 22:2188-2195 |
| ISSN: | 1004-924X |
| DOI: | 10.3788/ope.20142208.2188 |
| Popis: | An image restoration method of 2Dreconstructed-image of terahertz Gabor in-line digital holography was proposed with combination of Piecewise-contrast-stretching Transformation(PCST)and Patch-based Locally Optimal Wiener(PLOW)filter.The PCST and the PLOW algorithms were introduced,respectively,and the working flow of the combined PCST-PLOW algorithm was given.The denoising for a real 2.52 THz reconstructed-image of digital holography was executed,and each step of the image processing was compared.The effect of the PCST on the image enhancement was analysis,in which the starting point and the end point of the nodes were dependent on a histogram and an image average value.The results of treatment on the real terahertz reconstructed-image show that the global standard deviation of the denoising reconstructed-image of 40-frame averaged hologram rises from 0.184 9to 0.307 4,and the ratio of the mean value to standard deviation rises from 1.720 8to2.268 8.These results demonstrate that the proposed method has suppressed image noise,while improving image contrast. |
| Databáze: | OpenAIRE |
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