An Adapting Image Coding Method Based on Implicit ROI

SUN Chao; WANG Jian-feng; JIANG Shou-da

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An Adapting Image Coding Method Based on Implicit ROI

更新时间：2025-07-16

- An Adapting Image Coding Method Based on Implicit ROI
- Acta Electronica Sinica Vol. 36, Issue S1, Pages: 171-174,137(2008)
- 作者机构：
  
  哈尔滨工业大学自动化测试与控制系,黑龙江,哈尔滨,150001
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP301
- Published：2008
- 稿件说明：
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SUN Chao, WANG Jian-feng, JIANG Shou-da. An Adapting Image Coding Method Based on Implicit ROI[J]. Acta Electronica Sinica, 2008, 36(S1): 171-174,137.
DOI：

SUN Chao, WANG Jian-feng, JIANG Shou-da. An Adapting Image Coding Method Based on Implicit ROI[J]. Acta Electronica Sinica, 2008, 36(S1): 171-174,137. DOI：

摘要

针对JPEG2000中隐式ROI(Region of Interest)编码算法在低码率下重建图像感兴趣区质量较差的问题

提出了一种改进方法.利用拉格朗日插值法构造权重自适应函数

根据ROI码块中ROI小波系数个数所占比例及设定的目标码率

合理地为ROI码块分配权重

在保证更多ROI信息被优先编码的同时

降低背景小波系数的影响

从而提高了ROI小波系数在码流中的数据长度.实验结果表明

采用该算法

重建后感兴趣区图像质量较隐式ROI算法有明显提高.

Abstract

According to the poor quality problem in the region of interest in the reconstructed image which is generated by the implicit ROI(Region of Interest)algorithms in the low bit rate coding in JPEG 2000

an improved method is proposed.The proposed method makes use of the Lagrange interpolation to construct the weight adaptive function

gives a reasonable weight for the ROI code block according to the proportion of the number of ROI wavelet coefficients and the target code ration the ROI code block.While ensuring that more ROI information is encoded with higher priority

the background wavelet effects are reduced.Therefore the data length of the ROI wavelet coefficients in the data stream is enhanced.The experimental results show that the recon structed ROI image quality of the proposed algorithm is much better than the implicit ROI algorithm.

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