摘要传统采样定理(奈奎斯特定理)指出采样频率不低于信号最高频率的两倍才能避免 失真,但是对于一些图像和视频,按照奈奎斯特定理会给存储和传输带来巨大压力。如 今出现的压缩感知理论很好的解决这一矛盾,为数据采集技术带来历史性的突破,得到 了国内外专家和学者的广泛关注。本文首先综述了压缩感知理论,然后着重介绍信号稀 疏表示、观测矩阵设计、重构算法三个方面的最新进展,还对压缩感知理论的应用领域 进行了综述,最后对压缩感知理论在 CT 上的应用可行性进行了详细分析,并且对此研究 进行了展望。77743
毕业论文关键词 压缩感知 稀疏表示 观测矩阵 重构算法 CT 重建
毕 业 设 计 说 明 书 外 文 摘 要
Title Compressed Sensing Theory and its Application in the CT
Abstract Traditional sampling theorem Nyquist theorem states that the sampling frequency must be at least two times the highest frequency signal to avoid distortion, but for some images and video, according to the Nyquist theorem storage and transmission will bring enormous pressure。 Compressed Sensing theory emerged in recent years a good solution to this problem, data acquisition technology to revolutionize, has been widespread concern of domestic and foreign scholars and experts。 This paper reviews the theory of compressed sensing, and then focuses on the sparse observation matrix design, reconstruction algorithm latest developments in three areas, but also on the theory of compressed sensing applications were reviewed。 Finally, the compressed sensing theory on the CT application and research prospected。
Keywords Compressed sensing Sparse representation Observation matrix Reconstruction Algorithm CT reconstruction
本科毕业设计说明书 第 I 页
目 次
1 绪论 1
1。1 研究背景和意义 1
1。2 压缩感知及其在 CT 中应用的历史与现状 1
1。3 论文的内容和结构安排 3
2 压缩感知理论 3
2。1 压缩感知与传统采样定理的比较 4
2。2 压缩感知理论基本原理 5
2。3 压缩感知关键问题分析 6
2。4 本章小结 7
3 压缩感知理论的应用 8
3。1 雷达成像 8
3。2 信道估计 9
3。3 其它领域 9
3。4