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基于脊波双框架系统的图像融合和机场目标检测
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摘要
寻求图像尤其是自然图像的“稀疏”表示方法,一直以来都是数学、计算机视觉及数据压缩等领域专家学者研究的一个热点。小波变换的不足使得人们不断寻求更好的非线性逼近工具,脊波理论就在这样的背景下应运而生。脊波双框架系统一方面继承了正交脊波将线奇异转化为点奇异的核心思想,能有效的处理图像中的线奇异,另一方面又充分利用了现有的各种小波族。本文在深入研究脊波双框架系统的基础上,将其应用于图像融合、直线检测和机场检测等问题。主要工作概括如下:
     将脊波双框架系统和Curvelet双框架系统用于图像融合。根据脊波双框架变换子带间的方向性,提出了一种基于方向信息的局部方差的融合规则,并用于多聚焦、医学、遥感图像的融合问题,实验结果表明,其融合效果令人较为满意,尤其在融合后边缘等细节区域效果有所提高;根据传统方法检测直线的不足之处,将基波双框架用于直线检测,提出了一种结合脊波双框架系统的局部直线检测方法,实验结果表明,本文方法能够较精确的检测出直线的方向和位置,并且能够有效地抑制噪声的干扰;将脊波双框架系统应用于SAR图像机场目标检测之中,先对待检测图像进行简单的预处理,然后用脊波双框架系统对预处理以后的图像进行直线特征检测,检测到具有直线特征的跑道,然后再进行直线跟踪和二值化处理得到检测结果。实验结果表明,该算法实现简单,不需要复杂的后处理过程,而且可以较为准确的检测到机场主跑道。
It is of great importance to find methods that can sparsely represent natural images for researchers in the fields of mathematics, computer vision and data compression. Motivated by the failure of wavelet, much work has been done to look for new systems superior to separable wavelet systems. Ridgelet theory was developed under such a background. A new image representation system referred to as ridgelet bi-frame is developed, which not only inherits the key idea of the orthonormal ridgelet, but also provides a more generalized notion. Apply the ridgelet bi-frame to linear feature detection, Image fusion and airport detection is the main work in this paper. The research results included in this article are as follows:
     The papers apply the ridgelet bi-frame and curvelet bi-frame to images fusion. Based on the directional properties of ridgelet bi-frame subband, a new method for anisotropic images fusion method is presented, which combines with local variance of subband. The method is respectively applied to the multifocus, the medical and the remote image fusions in the experiments. Experiments show that they have achieved satisfactory results, especially in edge. Considering the problems for linear feature detection, a novel one based on ridgelet bi-frame for localized linear feature detection is given. All kinds of experiments show that the linear feature detection method based on ridgelet bi-frame is able to accurately detect the direction and position of a straight line, and can effectively suppress noise. we propose a new airport detection method for SAR images based on ridgelet bi-frame. At First, treat a simple preprocessing to images, and then extract straight lines form edge images, finally line tracking and binarization are employed. The experimental results show that the new algorithm is speedy and simple, meanwhile, it does not require complicated post-processing.
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