臺灣博碩士論文加值系統

本論文提出基於H.264/AVC的可視覺加密技術。具有快速編碼和視訊失真控制在可接受範圍的特性，可以用來有效的抵制複製或盜版。假設應用環境為使用者可以從網路下載並且播放可視覺加密後的視訊，若付費後取得解密的金鑰可得到無加密保護的正常視訊，而無付費使用者則得到低品質的內容免費公開，讓大眾可以了解影片內容也可達到宣傳效果。
我們提出了兩種加密方案，在經過CAVLC編碼後找出對應的DC和AC係數值做加密。在這兩種方案中由於只對I-Frame做加密，加密後的I-Frame會受到影響，P-Frame由於參照到加密的I-Frame也會受到影響。因此，所有的Frame受到影響而失真，以達到加密的效果。

In this thesis, an available visually of encryption technology based on H.264/AVC are proposed.With the features of fast encoding and video distortion controlled within an acceptable range,it can be used to effectively resist copying or piracy. Assume the application environment is that the user can download available visually encrypted video from the Internet and play them.With payment,the user will get the decryption keys to have the unencrypted normal video.Without payment,the user will get a low-quality free and public content.Thus, people can understand the video content for the purpose of advertisement.
We propose two encryption schemes, which find the corresponding DC and AC coefficient values to do encryption after the CAVLC coding.In both schemes, only the I-Frameshave been encrypted.The encrypted I-Framesare affected.Due to referring to the encrypted I-Frames,the P-Frames are alsoaffected.Therefore,all frames are affected and distorted to achieve the effect of encryption.

致 謝 i
摘 要 ii
Abstract iii
目 錄 iv
圖 次 vi
表 次 viii
第一章 緒論 1
第一節 研究背景及動機 1
第二節 研究目的 1
第三節 論文架構 2
第二章 文獻探討 3
第一節 H.264/AVC簡介 3
第二節 整體壓縮效能改進情形 5
第三節 視訊編碼技術的介紹 6
第四節 畫面間預測(Intra Prediction)模式 7
第五節 畫面間預測(Inter Prediction)模式 16
第六節 移動估測與移動補償 16
第七節 整數轉換 17
第八節 熵編碼 17
第九節 視訊壓縮圖像類型 17
第十節 相關文獻 18
第三章 基於H.264/AVC之可視覺加密 20
第一節 壓縮過程所造成的數值變動 20
第二節 加密方法 21
第四章 實驗結果與分析討論 23
第五章 結論及未來研究方向 31
第一節 結論 31
第二節 未來研究方向 31
參考文獻 32

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