基于相位调制的被动热光源多光谱鬼成像研究
文献类型：学位论文
| 作者 | 陈喆 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 韩申生 |
| 关键词 | 光谱成像 压缩感知 空间随机相位调制 标定方法 |
| 其他题名 | The research of the multi-spectral ghost imaging with passive thermal light by phase modulation |
| 中文摘要 | 光谱成像是一种将光谱分析和图像分析相结合的光学探测技术。自上世纪80年代起，经过近30年的发展，它已经被广泛地应用于航天航空遥感、工业、农业、环境与灾害监测、大气探测以及军事应用等多个领域。鬼成像是一种全新的计算成像技术，成像时以目标为信号源，先通过参考光场对目标进行调制，而后通过计算对获取的数据进行解调，得到目标的图像信息。压缩感知理论是一种全新的信号采集、编解码理论，本文所介绍的基于相位调制的被动热光源多光谱鬼成像技术将鬼成像技术、压缩感知理论与光谱成像相结合，在成像光路中引入空间随机相位调制器，进行目标物体三维图谱信息数据的调制和压缩，然后利用探测器获取的二维混叠信号进行三维图谱信息的重构，实现了通过单次曝光同时获取目标物体的三维图谱信息。这种光谱成像技术具有光能利用率高，成像时间短，系统结构简单等优势。同时，由于在成像过程中同步进行了数据的压缩和采样，极大的减小了数据量，降低了数据存储和传输的压力。 本文的内容主要包括： 1、对多光谱成像的分类、分光技术做了简单的介绍，并说明了光谱成像技术目前遇到的瓶颈以及发展趋势。 2、简要介绍了鬼成像技术和压缩感知的基本理论，及通过压缩感知理论进行数据采集时常用的测量矩阵，并介绍了压缩感知成像技术的发展历史和研究现状。 3、介绍了一种基于相位调制的被动热光源准单色鬼成像技术，进行了成像过程的数值模拟，验证了该技术的可行性，提出了一种标定方法，用以快速准确的获取这种成像系统的测量矩阵，分析了应用这种技术的成像系统的空间分辨率以及信噪比与系统参数的关系，还制造了原理样机，进行了一系列的室外实验。 4、在基于相位调制的被动热光源准单色鬼成像技术的基础上，介绍了一种基于相位调制的被动热光源多光谱鬼成像技术，通过数值模拟验证了其成像原理的可行性，并分析了其光谱分辨率与系统参数的关系，还进行了成像实验，实现了通过单次曝光获取目标物体的三维图谱信息。 |
| 英文摘要 | Spectral imaging is an optical detection technique which combines spectrum analysis and image analysis. Since the 1980s, with a development for nearly 30 years, this technique has been widely used in many fields in our society, for example, remote sensing, industry, agriculture, environmental disaster monitoring, atmospheric sounding, military application and so on. Ghost imaging is a new Computational imaging technology, during imaging, information about the scene of interest is first modulated by the reference light field, then demodulation is achieved throught calculation. Compressed sensing is a new theory about signal acquisition, encoding and decoding. The technique of multi-spectral ghost imaging with passive thermal light by phase modulation, which introduced by this article, is a combination of spectral imaging and compressive sensing theory. A spatial random modulator, which modulates and compresses the 3D spatial-spectral data-cube about the scene, is imported into the optical system. The 3D spatial-spectral information about the scene of interest is first encoded and captured with one snapshot using a two-dimensional (2D) detector array. Compressed sensing theory is then used to reconstruct the 3D data-cube from the 2D aliasing image. Compared with the conventional imaging spectrometry, this technique has many advantages, for example, highly efficient use of energy, short period of imaging, simple system structure, and etc. Meanwhile, because of the synchronization of data compression and sampling, this technology could greatly reduce the amount of original data, and alleviate the pressure of the data storage and transmission. This paper mainly consists of these content: Firstly, the classification and the optical splitting systems used in multi-spectral imaging are introduced, then, we state the bottleneck and developing trend in spectral imaging field. Secondly, a brief description of the basic theory of ghost imaging and compressive sensing is presented, then some compressive sensing measurement matrix is introduced. Thirdly, a quasi-monochromatic ghost imaging technology with passive thermal light by phase modulation is introduced, the imaging procedure is simulated to verify the feasibility of this technology, and an calibration method, which can obtain the measurement matrix of such imaging system quickly and accurately, is raised. The relationship between system performance and system parameters is analyzed, these system performance include spatial resolution and signal to noise ratio. Then, the experimental prototype is designed and fabricated, and a series of outdoor experiments are carried out. Lastly, based on the quasi-monochromatic ghost imaging with passive thermal light by phase modulation, we introduce a multi-spectral ghost imaging technology with passive thermal light by phase modulation, numerical simulations are conducted to show that the imaging principle of this technology is feasible, and the relationship between the spectral resolution and system parameters is deduced, and a spectral imaging experiment is implemented, after spatial-spectral image reconstruction, the capture of data-cube from a snapshot is achieved. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16850]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 陈喆. 基于相位调制的被动热光源多光谱鬼成像研究[D]. 中国科学院上海光学精密机械研究所. 2014. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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