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題名 | 全像亂相編碼之設計=The Random Phase Encoding Technology of Holography |
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作者 | 謝宏榮; 施儀良; Shei, Hung-jung; Chih, I-lang; |
期刊 | 中華技術學院學報 |
出版日期 | 20050600 |
卷期 | 32 民94.06 |
頁次 | 頁9-19 |
分類號 | 312.76 |
語文 | chi |
關鍵詞 | 相位; 全像; 毛玻璃; Phase; Holography; Ground glass; |
中文摘要 | 本研究提出一種物光亂項編碼的保密性體積全像儲存系統,並以編碼過的物光的共軛光重建,物光的編碼過程主要是藉由光學鎖達成,亂相編碼技術乃是基於防止未獲授權人士輕易取得全像影像資訊,此種技術在資訊保密上具有相當優勢,尤其是在辨識、多重儲存與保密方面更具特色。光學鎖的設計係採用兩片可個別自由旋轉方位的毛玻璃組合而成,分別稱為第一與第二毛玻璃,當經由物體漫反射後之物光經過光學鎖的第一毛玻璃時,其相位會隨第一毛玻璃的旋轉方位的不同而發生改變,此時再經過第二毛玻璃時,第二毛玻璃的旋轉方位將再度改變其相位變化,使原先入射的物光達到二次相位調製的目的。經由第一與第二毛玻璃的自由旋轉組合,可使經由此光學鎖調製後的物光與參考光干涉形成全像片時,在重建過程中如無經過此一光學鎖特定相位的調製,將無法有效獲得全像資訊。 |
英文摘要 | The random phase encoding to security hologram is based on protecting the access to the image from the unauthorized users. We propose a phase encoding technique (key) to the object beam in this research. The phase conjugate readout algorithm was used to reconstruct the image. Phase encoding in hologram can perform function of security verification, multiplexing storage and image encryption. The security technology of optical holography is adopt the two flakes and can liberalizing separately revolution of ground glass combined, call to the first and second ground glass respectively. When the object diffused reflection light is going into the first ground glass, its phase will change during the first ground glass, at this time again through the second ground glass, then it will once more transform its phase change. This research can reduce the possibility of copying the key, and then avoids decrypting the encrypted data. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。