论文部分内容阅读
针对干涉型计算层析成像光谱仪(CTII)提出了一种光谱图像数据立方体的重建方法。干涉型计算层析成像光谱仪是一种将空间调制傅里叶变换成像光谱仪(FTIS)的原理与计算层析成像光谱仪(CTIS)的原理相结合的一种新型成像光谱仪,具有高通量、高光谱分辨力以及高空间分辨力的特点。分析和讨论了干涉型计算层析成像光谱仪的工作原理以及获取图像的特征,介绍了光谱图像数据立方体的重建方法。根据多角度投影数据的特点提出采用卷积反投影计算层析成像图像重建算法,给出了图像重建步骤以及相应的数学表达式。对D65光源照明条件下的396×396像素目标进行了仿真实验,投影角度为0~180°,步长为0.5°,列出了仿真实验部分结果。实验结果验证了干涉型计算层析成像光谱仪及其图像重建算法的可行性。
Aiming at the interference computed tomography spectrometer (CTII), a reconstruction method of spectral image data cube is proposed. Interferometric computed tomography spectroscopy is a novel imaging spectrometer that combines the principle of a Spatially Modulated Fourier Transform Imaging Spectrometer (FTIS) with the principle of Computed Tomography Spectroscopy (CTIS), featuring high throughput, high Spectral resolution and high spatial resolution characteristics. The working principle of interference computed tomography spectrometer and the characteristics of image acquisition are analyzed and discussed. The reconstruction method of spectral image data cube is introduced. According to the characteristics of multi-angle projection data, a convolution backprojection tomography image reconstruction algorithm is proposed, and the image reconstruction steps and corresponding mathematical expressions are given. The experiment of 396 × 396 pixel under D65 illuminant was simulated. The projection angle was 0 ~ 180 ° and the step length was 0.5 °. The results of simulation experiment were listed. The experimental results verify the feasibility of the interferometric computed tomography spectrometer and its image reconstruction algorithm.