臺灣博碩士論文加值系統

　　新一代靜態影像壓縮標準JPEG2000逐漸取代以往普遍被使用的JPEG壓縮，並且擁有更好的壓縮比率以及影像品質。因此如何利用JPEG2000特性來達到資訊隱藏的目的，與降低對回復後影像品質的破壞是值得研究的方向。

　　本論文提出將欲隱藏的資訊隱藏在JPEG2000影像的背景部分。藉由人眼對背景影像較不敏感的特性，即使背景影像被嚴重破壞還是能確保影像中主要目標部分的品質，如此人眼將不易察覺影像的變化，藉此以達到資訊隱藏的目的。另外，將這個方法應用在影像保護是非常適合的，可達到保護影像的目標。

　　The JPEG2000 is a new compressive standard for still images. It is gradually replacing JPEG. It is possessed of better compressive rates and image quality than JPEG. Besides, there are special functions in JPEG2000, like ROI and progressive transmission. Hence, it becomes important to do research on information hiding with minimum destruction of quality of the recovered images in JPEG2000.
This paper proposes an approach that hides information in the part of background image, because human eyes are not sensitive to background images. Even more this method can ensure the quality of object parts of images and reduce the distortion of recovered images.

　　We use background information hiding method in image protections to avoid images taken without the agreement of owners. This method can be easily modified for the application of image protections. By experiment, it is demonstrated that the method is very suitable for image protections.

CHAPTER 1 Introduction................................1
1.1 Motivation..................................1
1.2 The Data Flow of JPEG2000 Compression.......2
1.3 Pre-Processing..............................3
1.4 Discrete Wavelet Transform..................5
1.5 Quantization................................6
1.6 EBCOT.......................................7
1.7 Region of Interest (ROI)...................10
CHAPTER 2 Information Hiding.........................12
2.1 The purposes of Information Hiding.........12
2.2 Suitability for JPEG2000 Data hiding.......15
2.2.1 Discrete Wavelet Transform.................15
2.2.2 Quantization...............................15
2.2.3 EBCOT Coding...............................16
2.3 Information Hiding in Tier-2...............16
2.3.1 Fixed Number of The Lowest Bit Plane.......17
2.3.2 Bit Planes Below The MSB...................17
2.3.3 Backward embedding.........................18
2.4 The Average Information Hiding Method......19
2.5 The Backward Information Hiding Method.....20
CHAPTER 3 Background Information Hiding..............23
3.1 Motivation.................................23
3.2 The Background Information Hiding Method...25
3.3 Encoders of Background Information Hiding..27
3.4 Decoders of Background Information Hiding..30
3.5 Image Protections..........................32
CHAPTER 4 Experimental Results.......................36
4.1 Experimental Results.......................37
4.2 Image Protections..........................44
CHAPTER 5 Conclusions................................47
REFERENCES............................................49

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