张洋,李庆忠

• 1:中国海洋大学工程学院山东省海洋工程重点实验室

摘要(Abstract)：

针对压缩效率和重建质量无法兼顾的问题,提出一种基于WBCT变换(Wavelet-based contourlet transform)的水下图像高效压缩算法。首先根据水下图像和人类视觉系统的特点,在WBCT变换域提出了一种改进的人眼最小可觉察失真(JND)模型,以自适应去除水下图像中的视觉冗余。然后,对重要的低频系数采用定长量化和无损压缩;而对高频系数,采用基于WBCT树结构的变精度定长量化和位置差降编码策略进行编码。实验结果表明,提出的算法不仅具有较高的压缩效率,而且能获得视觉上较为满意的解码效果,适用于水下图像在甚低比特率下的压缩传输。

关键词(KeyWords)： 水下图像;图像压缩;WBCT变换;JND模型

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究与发展计划项目(2006AA09Z237)资助~~

作者(Author): 张洋,李庆忠

DOI: 10.16441/j.cnki.hdxb.20140201

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