Compressive hyperspectral imaging in the molecular fingerprint band
Compressive hyperspectral imaging in the molecular fingerprint band
复制标题
DOI：
10.1364/oe.451380
复制
发表时间：
2022-05-09
期刊：
影响因子：
3.8
通讯作者：
Reid, Derryck T.
中科院分区：
文献类型：
--
作者：
Charsley, Jake M.;Rutkauskas, Marius;Reid, Derryck T.
光谱分辨成像为图像的每个像素提供了光谱，在中红外下，可以通过利用光谱特征和特定分子群之间的相关性来绘制其化学成分图。傅立叶变换干涉术与全场成像的兼容性使其成为光谱方法的选择，但奈奎斯特限制的条纹采样将干涉仪臂长的增量限制在不超过几微米的范围内，从而使采集变得耗时。在这里，我们展示了一种压缩高光谱成像策略，该策略结合了非均匀采样和平滑提升，然后以15%的奈奎斯特速率采集数据，提供了比最先进技术显著提高的采集率。通过用一系列适当设计的光谱来照亮测试对象，我们演示了在传输模式下跨越700-1400厘米(-1)区域的压缩高光谱成像。对得到的高光谱图像的后处理分析表明，该方法对绘画文化遗产上的不同材料进行有效的无损分类是有潜力的。由Optica出版集团根据知识共享署名4.0许可证条款出版。
Spectrally-resolved imaging provides a spectrum for each pixel of an image that, in the mid-infrared, can enable its chemical composition to be mapped by exploiting the correlation between spectroscopic features and specific molecular groups. The compatibility of Fouriertransform interferometry with full-field imaging makes it the spectroscopic method of choice, but Nyquist-limited fringe sampling restricts the increments of the interferometer arm length to no more than a few microns, making the acquisition time-consuming. Here, we demonstrate a compressive hyperspectral imaging strategy that combines non-uniform sampling and a smoothness-promoting prior to acquire data at 15% of the Nyquist rate, providing a significant acquisition-rate improvement over state-of-the-art techniques. By illuminating test objects with a sequence of suitably designed light spectra, we demonstrate compressive hyperspectral imaging across the 700-1400 cm(-1) region in transmission mode. A post-processing analysis of the resulting hyperspectral images shows the potential of the method for efficient non-destructive classification of different materials on painted cultural heritage. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License.