臺灣博碩士論文加值系統

為了滿足使用者對於多媒體技術上的需求，影像的壓縮需要有更高的表現，為了因應此需求，便發展出了JPEG2000影像壓縮的規格。與JPEG不同的是，JPEG2000採用了離散小波轉換，它不只比JPEG有更高的壓縮率，還同時提供了許多的特性，包含失真與無失真的壓縮，ROI(Region of Interest)，隨機存取，漸進式的傳輸，以及有更好的容錯率。在不久的將來，JPEG2000可能可以取代JPEG成為最普遍的一種影像壓縮格式。

In order to satisfy the requirements of multimedia technologies, image compression requires higher performance, and how to enhance the compression ratio becomes more and more important. Therefore, a new standard of still image compression, JPEG2000, is currently being developed. JPEG2000 encoding system adopts Discrete Wavelet Transform (DWT) and Embedded Block Coding with Optimal Truncation (EBCOT). Compared with JPEG, JPEG2000 provides several characteristics such as lossy and lossless compression, ROI (Region of Interest), random access, progressive transmission and good error resilience for an image. It may replace JPEG as the most popular image compression format in the near future.

Chapter 1 Introduction....................................1

Chapter 2 Discrete Wavelet Transform......................4
2.1 Reversible 5/3 Wavelet Transform......................5
2.2 Irreversible 9/7 Wavelet Transform....................7

Chapter 3 Quantization...................................10

Chapter 4 Embedded Block Coding with Optimal Truncation..12

Chapter 5 Experimental Results...........................15
5.1 Peak Signal-to-Noise Ratio...........................15
5.2 Results of Implementation............................15

Chapter 6 Conclusion and Discussion......................21

References...............................................22

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[Exif] http://www.exif.org

[ISO04] http://dret.net/biblio/reference/iso15444-1