數位全像技術於三維影像資訊加密與防偽之應用

本論文以任意微相位步進數位全像術為基礎，利用光學干涉及數位影像處理，以快速擷取三維物體影像及加密鑰匙之全像資訊，並配合電腦製作全像片之方式，達到全像加密之目的；若要完成解密則需所有之鑰匙資訊，其中包含關鍵加密鑰匙之振幅及相位分布、影像重建之距離、零階項之消除及共軛影像之抑制等，才能進一步取得加密之影像訊息。另外利用不同像平面之辨識資訊，以線性疊加方式隱藏於加密資訊內，除可進一步傳達重要訊息外，更可達到防偽之效果。此技術在影像不失真之情況下，保留傳統光學全像加密技術之嚴謹性，同時兼具數位全像處理之便利性，可在全像資訊傳輸之保密安全上提供較佳之解決方案。

關鍵字

數位全像加密；任意相位步進數位全像術；柱狀透鏡陣列；鑰匙

並列摘要

This paper applies the arbitrary micro phase-step digital holography with optical interferometry and digital image processing to acquire the three-dimensional object image and encryption keys information. Then using computer generated hologram to achieve the purpose of holographic encryption. We need all keys information to execute the decryption, which contain the amplitude and phase distribution of encryption keys, the distance of image reconstruction, zero-order term elimination and twin-image term suppression. In addition to using identifiable information on different image plane and linear superposition processing hidden within the encrypted information, we can not only convey an important message, but also to achieve the effect of anti-counterfeiting. This technique can retain the strictness of traditional optical holographic encryption and the convenience of digital holographic processing without images distortion. Therefore we can provide better solutions on the confidential security of holographic information transmission.

並列關鍵字

Digital holographic encryption ； arbitrary phase-step digital holography ； lenticular lens array ； key

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