Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization
Speckle noise in digital holography has a great influence on image quality, and one of the reasons for the formation of speckle noise is that the degree of coherence for the reference light and the object light is too high and unnecessary noise is introduced to the recorded hologram. In this paper,...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2020-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/8972470/ |
| _version_ | 1818910149364940800 |
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| author | Tongyao Du Yong Kong Xinlei Qian Wei Ding Zhenwei Wang |
| author_facet | Tongyao Du Yong Kong Xinlei Qian Wei Ding Zhenwei Wang |
| author_sort | Tongyao Du |
| collection | DOAJ |
| description | Speckle noise in digital holography has a great influence on image quality, and one of the reasons for the formation of speckle noise is that the degree of coherence for the reference light and the object light is too high and unnecessary noise is introduced to the recorded hologram. In this paper, the spatial depolarization and the temporal domain depolarization are analyzed to reduce the speckle noise. The spatial depolarization utilizes the depolarization performance of the depolarizer. By adding a quartz depolarizer to the object light, the linearly polarized light in the object light becomes randomly polarized light, thereby reducing the degree of coherence with the reference light, realizing the suppression of speckle noise, and by utilizing the characteristics of pupil parameters towards the depolarization degree, it is to realize the control for the degree of coherence. The temporal domain depolarization uses two quarter-wave plates and adjustable liquid crystal to realize the depolarization superposition. By controlling the phase delay of the liquid crystal phase variable retarder, the multi-depolarization accumulation in a short time is realized, and the experimental results show that this method preserves the detail portion of the image while better removing speckle noise. Finally, the Non-Local Means filtering algorithm is used to make the reconstructed image smoother. The method proposed in this paper has great applicable value for improving the image quality of digital holography system. |
| first_indexed | 2024-12-19T22:38:13Z |
| format | Article |
| id | doaj.art-e2cd887fd316488580a409bc9a5e782f |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-19T22:38:13Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-e2cd887fd316488580a409bc9a5e782f2022-12-21T20:03:09ZengIEEEIEEE Access2169-35362020-01-018222662227410.1109/ACCESS.2020.29700848972470Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain DepolarizationTongyao Du0https://orcid.org/0000-0002-5606-5394Yong Kong1https://orcid.org/0000-0002-0471-580XXinlei Qian2https://orcid.org/0000-0003-0933-6582Wei Ding3https://orcid.org/0000-0002-2414-475XZhenwei Wang4https://orcid.org/0000-0001-9645-3554School of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai, ChinaSchool of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai, ChinaSchool of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai, ChinaSchool of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai, ChinaSchool of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai, ChinaSpeckle noise in digital holography has a great influence on image quality, and one of the reasons for the formation of speckle noise is that the degree of coherence for the reference light and the object light is too high and unnecessary noise is introduced to the recorded hologram. In this paper, the spatial depolarization and the temporal domain depolarization are analyzed to reduce the speckle noise. The spatial depolarization utilizes the depolarization performance of the depolarizer. By adding a quartz depolarizer to the object light, the linearly polarized light in the object light becomes randomly polarized light, thereby reducing the degree of coherence with the reference light, realizing the suppression of speckle noise, and by utilizing the characteristics of pupil parameters towards the depolarization degree, it is to realize the control for the degree of coherence. The temporal domain depolarization uses two quarter-wave plates and adjustable liquid crystal to realize the depolarization superposition. By controlling the phase delay of the liquid crystal phase variable retarder, the multi-depolarization accumulation in a short time is realized, and the experimental results show that this method preserves the detail portion of the image while better removing speckle noise. Finally, the Non-Local Means filtering algorithm is used to make the reconstructed image smoother. The method proposed in this paper has great applicable value for improving the image quality of digital holography system.https://ieeexplore.ieee.org/document/8972470/Digital holography speckle noisedepolarizationquartz depolarizerliquid crystal |
| spellingShingle | Tongyao Du Yong Kong Xinlei Qian Wei Ding Zhenwei Wang Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization IEEE Access Digital holography speckle noise depolarization quartz depolarizer liquid crystal |
| title | Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization |
| title_full | Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization |
| title_fullStr | Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization |
| title_full_unstemmed | Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization |
| title_short | Suppression of Speckle Noise in Digital Holography With Spatial and Temporal Domain Depolarization |
| title_sort | suppression of speckle noise in digital holography with spatial and temporal domain depolarization |
| topic | Digital holography speckle noise depolarization quartz depolarizer liquid crystal |
| url | https://ieeexplore.ieee.org/document/8972470/ |
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