可逆式數位影像認證技術之研究

The Study of Reversible Authentication Techniques for Digital Images

施佐憲(Tso-Hsien Shih)

指導教授 ： 張真誠

國立中正大學/工學院/資訊工程學系/碩士(2015年)

摘要

影像認證是一種偵測圖片遭竄改區域的技術。此外，可逆式影像認證可以讓沒有遭到竄改的圖片無失真地復原成原始的版本。
“優良影像品質的可逆式數位影像之認證方法”是我們在此論文中提出的第一個可逆式認證方法。這個方法將目標影像分成平滑影像區塊以及複雜影像區塊，根據影像區塊種類的不同，用不同的藏入方法將驗證碼藏入影像區塊中，以供之後的驗證之用。
第二個可逆式影像認證方法是“基於菱形預測和區域複雜度的有效可逆式影像認證”。在這個方法中，我們使用差值擴張和菱形預測來藏入驗證碼。在擁有高精準度之竄改偵測的同時，這個方法也維持良好的偽裝影像品質，以及影像的可復原性。

關鍵字

高影像品質 ； 可復原性 ； 易碎浮水印 ； 竄改偵測 ； 影像認證

並列摘要

The authentication scheme is a technique that detects tampered areas in images. Additionally, reversible authentication allows images to be reconstructed to their original version without any distortion if these images had not been tampered.
“A Reversible Authentication Scheme for Digital Images with High-Quality Images” is first proposed scheme of reversible authentication in this thesis. This scheme classifies the host image into smooth blocks and complex blocks, and then authentication codes are embedded adaptively into each image block for afterward verifying. The experimental results demonstrated that the scheme obtained good tamper detection and preserved the high image quality of the embedded image
The second reversible authentication scheme is “Effective reversible image authentication based on rhombus prediction and local complexity”. In this scheme, difference expansion and rhombus prediction are used for embedding the authentication code. With high accuracy of tamper detection, it maintains good quality of stego images and reversibility at the same time.

並列關鍵字

Fragile watermark ； Tamper detection ； Image authentication ； Reversibility ； High quality

參考文獻

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