A study on digital holographic encryption using double random phase masks

• Main Authors: Jin-Wen Chou, 周進文
• Other Authors: Jin-Jei Wu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/xms6cb

碩士 === 國立臺北科技大學 === 光電工程系研究所 === 97 === In this study, we investigation the properties of double random phase encoding and its application on digital holographic encryption and key mask design. Firstly, we study the properties of the double random phase mask and digital holographic encryption approaches. Then, we propose and demonstrate a new full phase digital holographic encryption approach using double random phase key masks. This proposed encryption approach is executed by phase-encoding input images with double random phase masks. Furthermore, the possibility of the random phase mask using the liquid crystal spatial light modulator is investigated and analyzed. Selecting the appropriate modulation range, we can obtain the phase variation property similar to random phase mask for optical implementation. Further, we construct a full phase digital holographic encryption system to experimentally verify the validity of the approach with the input binary image. Finally, an on-line programmable full phase digital holographic encryption system based on the liquid crystal spatial light modulator is experimentally demonstrated. Both simulated and experimental results are presented and discussed, which are correctly proved and satisfactory.