Resolution improvement for enhancing interference fringes of digital holograms with near infrared illuminance |
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| Institution: | 1. College of Electronic Engineering, South China Agricultural University, Guangzhou 510642, China;2. Institute of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China;1. Department of Electro-optical and Energy Engineering, Ming Dao University, Changhua 52345, Taiwan, ROC;2. School of Defense Science, National Defense University, Tashi, Taoyuan 33509, Taiwan, ROC;3. Department of Applied Chemistry & Material Science, National Defense University, Taiwan, ROC;4. Department of Material Science and Engineering, Ming Dao University, Changhua 52345, Taiwan, ROC;1. Optics Laboratory, Applied Physics Department, Faculty of technology & Engineering, The M. S. University of Baroda, Vadodara 390001, India;2. Centre for Sensors, Instrumentation and Cyberphysical System Engineering (SeNSE), IIT Delhi, India;3. Institut für Lasertechnologien in der Medizin und Meßtechnik an der Universität Ulm, Helmholtzstrasse 12, 89081 Ulm, Germany;4. Institut für Technische Optik, Universität Stuttgart, Pfaffenwaldring 9, 70569 Stuttgart, Germany;5. Center of Medical Physics and Biomedical Engineering, Medical University of Vienna, Waehringer Guertel 18-20, 4L, 1090 Vienna, Austria;6. Department of Electrical Engineering, University of Connecticut, Storrs, CT 06269-4157, USA;1. Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, Beihang University, Beijing 100191, China;2. College of Applied Sciences, Beijing University of Technology, 100 Pingleyuan Road, Beijing 100124, China |
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| Abstract: | A new resolution improving method of enhancing the interference stripes, which can achieve better reconstruction of the recorded object of infrared digital holography has been proposed in this paper. The experiment is conducted under near infrared illuminance. We create poor quality holograms with very low-resolution interference stripes and enhance it with our new method. The processed holograms have much higher-resolution interference stripes. This method is based on interpolation theory, and we make it works fast, stable and easy to apply. Both the forward and backward interpolation of the oriental and portrait direction of the source pixels have been calculated, and have been used to realize the final aim of resolution improvement. During the experiment, since the responsivity of the CCD is not satisfied with the illuminance laser, which is by design, we also give specific analysis on the experimental setup of our work to make sure the object information can be fully recorded by the optical setup but cannot be reconstructed because of the low-resolution and unobvious of the interference stripes. After the resolution improvement process of the original hologram, the object information can then be fully reconstructed, which is very clear in the paper. Figures and dataflow give evidence and demonstrate the good performance of our method. |
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| Keywords: | Infrared digital holography Resolution improvement Interference stripes enhancement Image process |
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