基于ucos的圖像壓縮與解壓縮的實現

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目  錄

 第1章  緒論 .................................................................1
 1.1圖像壓縮的必要性 .........................................................1
 1.2圖像數據壓縮的可行性 .....................................................1
 1.3圖像壓縮技術的發展和現狀................................................. 2
1.3.1圖像編碼技術發展歷史.................................................... 2
1.3.2圖像編碼技術的現狀 ......................................................3
 第2章  圖像壓縮的理論基礎 ...................................................4
 2.2 圖像壓縮的國際標準 ......................................................6
 2.3 哈夫曼編碼.............................................................. 7
2.3.1哈夫曼編碼原理 ..........................................................7
2.3.2 哈夫曼編碼在圖像壓縮中的實現........................................... 8
 2.4  BMP文件格式 ............................................................11
 2.5 JFIF格式...............................................................13
 2.6 JPEG壓縮實現的過程...................................................... 17
 2.7  解壓縮過程 .............................................................21
 第3章  軟件功能設計 .........................................................22
 3.1  UC/OS嵌入式實時操作系統部分............................................ 22
3.1.1嵌入式系統 ............................................................22
3.1.2 UC/OS系統 ...........................................................23
3.1.3 UC/OS系統移植 .......................................................24
 3.2 UC/OS應用部分 ........................................................31
 3.3 UC/OS main()函數 .....................................................32
 3.4 bmp轉jpg的實現........................................................35
 第4章  軟件系統調試......................................................... 39
 4.1 Source Insight 修改調試工具............................................39
 4.2 UC/OS 操作平臺的調試...................................................40
 4.3 bmp轉jpg程序調試 ......................................................41
 第5章總結與展望 ............................................................45
 致  謝................................................................... 47
 參考文獻................................................................. 48
附錄:.....................................................................49

摘   要
     圖像壓縮是用最少的數據量來表示盡可能多的原圖像的信息的一個過程。對于圖像來說，如果需要進行快速或實時傳輸以及大量存儲，就需要對圖像數據進行壓縮。圖像壓縮原屬于個人計算機（PC）范疇，現在正普遍用于嵌入式環境。這種趨勢很大程度上是由于新的單片機處理能力提高和多媒體功能增強的結果。
 UC/OS 是嵌入式開發中常用到的一種操作系統，本文就是利用UC/OS的實時操作平臺來調用轉換程序。本文首先介紹了圖像壓縮的必要性，可行性和狀況。其次介紹了圖像壓縮的理論基礎，國際標準，各種編碼方法及壓縮的步驟，分析了各種壓縮算法，并對其中的一種壓縮方法用實例來闡述。再次結合上述理論分析了本人的畢業設計作品，針對畢業設計作品提出更好的修改思路，重點是把自己已實現了的程序展示出來，讓更多的人了解壓縮的秘密。

關鍵詞：圖像壓縮；jpeg；bmp；UC/OS；解壓縮；哈夫曼編碼
 
  
 
 ABSTRACT
      Image compression is a process that using the least amount of data to indicate as many as possible of the original image information. For images, if want to quick or real-time transmission and a large amount of storage,the needs is image data compression. Image compression once belonged to personal computer (PC) areas, are now widely used in embedded environment. The results of this trend is largely due to the new handling capacity of the MCU and multimedia enhancements improved.
 UC/OS is a common using operating system in embedded development work. This paper make use of UC/OS real-time operating platform to call the conversion process. First, this paper introduced the image compression of the need and feasibility of the situation. Second,this paper introduce the basis of the theory of image compression, international standards, all kinds of compression and encoding method steps of a variety of compression algorithms, and show one of the compression method used examples to elaborate. Third ,this paper analysis the design work of my graduation with the theoretical in the last part. Graduated from my design work , it bring up more better amendments.The focus is that list out my own program and let more people understand the secret of compression.
 
Key words: picture compression; jpeg; bmp; UC/OS; decompression; huffman