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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/9694


    Title: JPEG2000硬體架構與數位浮水印系統之設計與實現;Design and Implementation of JPEG2000 Hardware Architecture and Digital Watermark System
    Authors: 蔡連宗;Lian-Tsung Tsai
    Contributors: 電機工程研究所
    Keywords: 影像壓縮;浮水印;JPEG2000;Digital watermark
    Date: 2004-07-07
    Issue Date: 2009-09-22 11:53:46 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 新一代的靜態影像壓縮標準JPEG2000與目前現存的影像壓縮標準比較起來,不只擁有更高的壓縮效率,還提供了多種功能,並可廣泛的應用在各種領域中。本論文將針對JPEG2000靜態影像編碼系統作分析與其架構的設計,我們可經由實驗結果發現JPEG2000編碼系統的瓶頸在於EBCOT方塊編碼器。因此在本論文中,我們討論了幾種可以降低EBCOT編碼器運算時間的策略。在演算法的改良上,我們設計了兩種加速方法:CUPS (Clean-Up Pass Skipping) 和PP (Pass Predicting) ,並經實驗證明了運用這兩種加速方法可以有效的降低EBCOT context產生器平均65~69%的運算時間。 我們完成了一個有效率的JPEG2000編碼系統硬體架構設計。我們採用與JPEG2000標準相容且最簡單的方式去實現。在EBCOT演算法方面,我們將前面所提出的加速演算法CUPS與PP加入,提出了一個硬體架構設計。本論文中所提出的加速演算法CUPS,僅需要累加器去加總已編碼過的位元數目即可達成。加速演算法PP則需要額外的組合邏輯電路及兩塊記憶體來紀錄預測下一位元平面編碼掃描的情況。這些許的元件可使得整個EBCOT的編碼速度上更有效率。 此外,近年來由於多媒體之數位化及網際網路軟硬體之蓬勃發展,使得數位多媒體資料的取得及使用更趨便利,使這些大量的數位多媒體資料更容易被取得與利用或變更內容,所以著作權的宣告也就變的十分重要,而數位浮水印系統應用在這種數位著作權宣告是目前蓬勃發展的一項新技術,有不同的演算法被提出但大都是著重在後端的處裡,在本篇論文中,針對多媒體資料的特性與資料加密技術提出一個抵抗壓縮攻擊的數位浮水印系統,結合JPEG2000壓縮的標準,在影像壓縮的同時即將著作權宣告嵌入影像資料內,以達到擷取即保護的功能,我們使用Philips TriMedia TM-1300的DSP發展系統完成JPEG2000數位浮水印系統。 A new still image standard, JPEG2000, supplies not only higher compression performance but also various functionalities. This thesis focuses on the analysis and architecture design for a JPEG2000 still image encoding system. We analyze this system with several experiments. Based on the experiment results, the bottleneck for JPEG2000, EBCOT, is found. In this regard, some strategies for decreasing the computation time of EBCOT are discussed. In order to improve the EBCOT algorithm, Clean-Up Pass Skipping method (CUPS) and Pass Predicting method (PP) are proposed. We verify the CUPS and PP methods by completed simulation on C environment and they can reduce the 65~69% clock cycles for EBCOT context modeling. We achieve the efficient hardware architecture for the JPEG2000 encoding system. For the architecture design of EBCOT context modeling, proposed speed-improved methods are included. The CUPS method only needs an accumulator to sum up the number of coefficient-bits in a bit-plane that have been coded in Pass1 and Pass2. The PP method requires extra combinational logic circuits and two predict tables to record the addresses when the Pass1 and Pass2 coding are needed. A few components can improve the speed efficiency. Due to the rapid development of the networking and communication, the distribution of digital data is faster and arbitrary. There more consumer product is produced and popular, such as DSC, DV ...etc. In order to protect copyright of the multimedia data, a data capturing, compressing and ownership declaring is done at the same time. In this paper, a watermarking system for embedding wavelet transform domain and Philips TriMedia TM-1300 implementation is presented. The watermarking system applied Toral Automorphism to build a watermarking system which it is suitable for JPEG2000 watermarking.
    Appears in Collections:[電機工程研究所] 博碩士論文

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