海洋测绘2012，Vol.32Issue(1)：8-10,17,4.DOI:10.3969/j.issn.1671-3044.2012.01.003
Curvelet变换域侧扫声纳图像增强算法
Enhancement Algorithm of Side-scan Sonar Image in Curvelet Transform Domain
摘要
Abstract
Considering the low contrast, weak texture and strong noise of side-scan sonar image,a sonar image enhancement algorithm based on the second generation Curvelet transform is proposed. Firstly, the original sonar image is decomposed at different scales and directions by Curvelet transform to obtain the low frequency subband coefficients and the high frequency subband coefficients. And then the Sigmoid function is applied to deal with the low frequency subband coefficients, so as to enhance the global contrast of the images. A new nonlinear function is also used to process the high frequency subband coefficients, which aims at highlighting the edge and texture details of the image. The noise threshold is chosen by estimating the noise levels and used to de-noise. Finally,the enhanced sonar image is obtained by the inverse Curvelet transform. Experimental results show that the enhancement method proposed in this paper can not only enhance the contrast of the sonar image and reduce the noises of the image, but also can highlight the edge and texture details of the sonar image.关键词
Curvelet变换/S型函数/非线性增益函数/侧扫声纳图像/图像增强Key words
Curvelet transform/ Sigmoid function/ nonlinear gain function/ side-scan sonar image/ image enhancement分类
天文与地球科学引用本文复制引用
盛惠兴,孟凡玲,李庆武,马国翠,曹晔锋..Curvelet变换域侧扫声纳图像增强算法[J].海洋测绘,2012,32(1):8-10,17,4.基金项目
国家自然科学基金项目(60972101). （60972101）
