Wang Lizhi, Xiong Zhiwei, Gao Dahua, Shi Guangming, Wu Feng
Appl Opt. 2015 Feb 1;54(4):848-58. doi: 10.1364/AO.54.000848.
Coded aperture snapshot spectral imaging (CASSI) provides an efficient mechanism for recovering 3D spectral data from a single 2D measurement. However, since the reconstruction problem is severely underdetermined, the quality of recovered spectral data is usually limited. In this paper we propose a novel dual-camera design to improve the performance of CASSI while maintaining its snapshot advantage. Specifically, a beam splitter is placed in front of the objective lens of CASSI, which allows the same scene to be simultaneously captured by a grayscale camera. This uncoded grayscale measurement, in conjunction with the coded CASSI measurement, greatly eases the reconstruction problem and yields high-quality 3D spectral data. Both simulation and experimental results demonstrate the effectiveness of the proposed method.
编码孔径快照光谱成像（CASSI）提供了一种从单个二维测量中恢复三维光谱数据的有效机制。然而，由于重建问题严重欠定，恢复的光谱数据质量通常受到限制。在本文中，我们提出了一种新颖的双相机设计，以提高CASSI的性能，同时保持其快照优势。具体而言，在CASSI的物镜前放置一个分束器，这使得同一场景能够被灰度相机同时捕获。这种未编码的灰度测量与编码的CASSI测量相结合，极大地缓解了重建问题，并产生高质量的三维光谱数据。仿真和实验结果均证明了该方法的有效性。
