基于平稳小波变换和Retinex的红外图像增强方法

占必超; 吴一全; 纪守新

doi:doi:10.3788/aos20103010.2788

光学学报, 2010, 30 (10): 2788, 网络出版: 2012-10-24

基于平稳小波变换和Retinex的红外图像增强方法下载： 829次

Infrared Image Enhancement Method Based on Stationary Wavelet Transformation and Retinex

论文大纲

占必超 ^1,*吴一全 ^1,2纪守新 ¹

作者单位

¹ 南京航空航天大学信息科学与技术学院，江苏南京 210016

² 南京大学计算机软件新技术国家重点实验室，江苏南京 210093

摘要

针对基于小波变换的红外图像增强方法视觉效果不够理想的缺点，提出了一种基于平稳小波变换和Retinex的红外图像增强方法，利用Retinex增强算法增强图像的视觉效果，并改善其亮度均匀性。首先，对红外图像经平稳小波变换后的最大尺度低频子带图像进行多尺度Retinex增强；然后，利用贝叶斯萎缩阈值法对高频子带图像进行阈值去噪，并根据低频子带图像的局部对比度和模糊规则计算高频子带的增益系数，从而得到增强后的高频子带图像；最后，由低频子带图像和高频子带图像重构得到增强后的图像。针对大量图像进行了实验和增强效果的定性与定量评价，并与双向直方图均衡法、二代小波变换法、Curvelet变换法和多尺度Retinex法作了比较。结果表明，所提出的方法增强了图像细节，抑制了噪声，并明显改善了图像的整体视觉效果。

Abstract

As infrared image enhancement method based on wavelet transformation has the problem of unperfect visual effect, and Retinex enhancement algorithm can enhance visual effect of the image by improving brightness uniformity, a method based on stationary wavelet transformation and Retinex is proposed. Firstly, the infrared image is decomposed into high-frequency detail and low-frequency approximation components at various resolutions, and the low frequency subband image of the largest scale is enhanced by multiscale Retinex algorithm. Then, the high-frequency subband images are denoised by Bayesian shrinkage method, and the gain coefficients of high-frequency subbands are available by calculating the local contrast of the enhanced low-frequency subband based on fuzzy rules to get the enhanced high-frequency subband images. Finally, the enhanced image is reconstructed by the low-frequency subband and high-frequency subbands. Experiments with qualitative and quantitative evaluation are carried out for many images, and the proposed method is compared with histogram double equalization method, second generation wavelet transform method, curvelet transform method, and multiscale Retinex method. Experimental results show that the proposed method can enhance image details and suppress noise better, and the whole visual effect is improved significantly.

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占必超, 吴一全, 纪守新. 基于平稳小波变换和Retinex的红外图像增强方法[J]. 光学学报, 2010, 30(10): 2788. Zhan Bichao, Wu Yiquan, Ji Shouxin. Infrared Image Enhancement Method Based on Stationary Wavelet Transformation and Retinex[J]. Acta Optica Sinica, 2010, 30(10): 2788.

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