计算机工程 ›› 2009, Vol. 35 ›› Issue (14): 173-174.doi: 10.3969/j.issn.1000-3428.2009.14.060

• 图形图像处理 • 上一篇    下一篇

精确码率控制JPEG2000感兴趣区域编码

侯 俊1,程 燕2   

  1. (1. 上海理工大学光学与电子信息工程学院,上海 200093;2. 华东政法大学,上海 200040)

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2009-07-20 发布日期:2009-07-20

Region of Interest Coding in JPEG2000 with Accurate Bitrate Control

HOU Jun1, CHENG Yan2

  

  1. (1. College of Optical and Electronic Information Engineering, University of Shanghai for Science and Technology, Shanghai 200093;2. East China University of Political Science and Law, Shanghai 200040)

  • Received:1900-01-01 Revised:1900-01-01 Online:2009-07-20 Published:2009-07-20

摘要:

提出一种能精确控制各编码层码率的JPEG2000感兴趣区域编码算法,对整个图像进行统一的JPEG2000编码,分别统计背景、感兴趣区域各自分配到的比特数。利用率失真函数的凸函数特性,在总码率恒定的条件下调整上述两区域分配的比特数,使得感兴趣区域获得优于背景区域的编码质量。该算法中感兴趣区域及其优先级均可动态改变,生成码流与标准完全兼容。

关键词: 感兴趣区域, 动态优先级, 精确码率控制, 率失真函数

Abstract: An algorithm for Region Of Interest(ROI) coding in JPEG2000, which can achieve the accurate bitrate control in each layer, is proposed in this paper. It codes the image without concerning the ROI. Then it counts out the bits allocated for the background and the ROI respectively. Under the constraints of the total bitrate, the proposal method reallocates the bits for both regions above. By this way, the ROI can achieve higher performance than the background due to the convex characteristic of rate-distortion function. Both the ROI and its priority can be modified in the algorithm, and the algorithm produces a fully compliant JPEG2000 code stream.

Key words: Region Of Interest(ROI), dynamic priority, accurate bitrate control, rate-distortion function

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