臺灣博碩士論文加值系統

數位影像浮水印利用人眼無法察覺影像細微變化的弱點，將可以
表彰著作版權的資訊，嵌入在原數位影像中。可逆式浮水印技術是將
一張影像中，正確的浮水印資訊取出後，又可將影像還原至浮水印嵌
入之前的技術。本論文將影像像素以8 位元表示儲存，調整各個像素
值之間的差值，並將浮水印放至 LSB 的位置，以嵌入浮水印資訊，
同時利用差值之間的差距分布，達到可逆式浮水印的功能。本文改良
前人固定區塊大小的 LSB 嵌入方式，提出可變區塊大小之浮水印技
術，藉由將影相切割成不同區塊大小 8×8、4×4、及 2×2 來提升區塊
的嵌入量，實驗結果顯示，浮水印嵌入量具有良好的改進結果。

A reversible watermarking approach recovers the original image
from a watermarked image after extracting the embedded watermarks.
This paper presents a variable block size reversible image watermarking
approach. The proposed method first segments an image to 8×8, 4×4 or
2×2 blocks according to their block structures. Then, the differences
between central pixel and other pixels in each block are enlarged. At last,
watermarks are embedded into LSB bits of above differences.
Experimental results show that the proposed variable block size method
has higher capacity than conventional fixed block size method.

目錄
摘要. i
Abstract . ii
致謝.iii
表目錄.vi
圖目錄vi
第一章 序論. 1
1.1 研究動機. 1
1.2 研究方法. 3
1.3 論文架構. 3
第二章 文獻探討. 4
2.1 差值擴張可逆式浮水印技術. 4
2.2 區塊為主之差值擴張浮水印技術. 6
第三章 可變區塊可逆式浮水印技術. 13
3.1 可變區塊可逆式浮水印技術的嵌入演算法. 13
3.2 可變區塊可逆式浮水印技術的取出演算法. 15
3.3 可變區塊可逆式浮水印技術的特性. 17
第四章 實驗結果與討論. 19
4.1 嵌入浮水印與分析. 20
4.2 方法比較與分析. 25
第五章 結論與未來展望.26
5.1 結論. 26
5.2 未來展望. 26
參考文獻. 27

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