[[alternative]]A Study on Reversible Information Hiding Technique for Lossless Compressed Image

碩士資訊工程學系[[abstract]]「資訊隱藏」是將機密資訊藏入多媒體數位產物，如影像、圖形、文字、音訊、影片等的一項機制，由於資訊藏入後並不會改變原本多媒體的特性，使得不法者無法察覺到有訊息藏在其中，如此即可達到秘密通訊的目的。由於資訊隱藏的重要性及實用性，使得資訊隱藏成為相當熱門的研究領域，並且有許多有趣的延伸、變形及應用，如在醫學應用上的影像及衛星圖等。 在可回復資訊隱藏技術，是將重要機密資訊從取出後，能夠回復到它原始的狀態。本篇論文我們以Chuang 和Lin 的無失真影像壓縮方法為基礎，開發一個適用於無失真壓縮方法的可回復資訊隱藏方法，此演算法可以成功的將重要資料藏入無失真影像壓縮碼中，當重要資料從壓縮碼中被取出的同時，還能夠回復壓縮影像成原始影像，就我們所知，我們是第一個成功開發適用於無失真壓縮方法的可回復資訊隱藏方法。根據我們的實驗結果，我們所提出的方法在藏量及壓縮效果上都有很好的表現。[[abstract]]Information hiding is a technique that embeds the data in a cover media such as text, image, audio, video, and so on. The characteristic of the media will not be changed after embedding secret data. So the grabbers can't detect the secret data easily. Hence it can achieve the purpose of the secret communication. Because of the importance and practicability with information hiding. Make information hiding become quite hot research field. And there are a lot of interesting extensions and applications, including medical applications, satellite images and so on. The reversible information hiding techniques remove the embedded data from the setgo-medium such that the setgo-medium can be recovered to its original appearance. In this thesis we develop a reversible data embedding method apply to lossless image compression method based on Chuang and Lin of lossless image compression for foundation. This algorithm can succeeded in hiding the important data into lossless image compressed code success. When important data extracted from compressed code simultaneously. And the compress image can also revert to original image. As we know, we are the first successful development reversible data embedding method apply to lossless image compression method. According to the result of experiment, the method we propose can keep a good quality in embedding capacity and compress result