Hlubuček J, Lukeš J, Václavík J, Žídek K
Opt Lett. 2022 May 1;47(9):2342-2345. doi: 10.1364/OL.454729.
We propose a novel, to the best of our knowledge, concept of the differential coded aperture snapshot spectral imaging (D-CASSI) technique exploiting the benefits of using a {-1,+1} random mask, which is demonstrated by a broadband single-snapshot hyperspectral camera using compressed sensing. To double the information, we encode the image with two complementary random masks, which proved to be superior to two independent patterns. We utilize dispersed and non-dispersed encoded images captured in parallel on a single detector. We explored several different approaches to processing the measured data, which demonstrates significant improvement in retrieving complex hyperspectral scenes. The experiments were completed by simulations in order to quantify the reconstruction fidelity. The concept of differential CASSI could be easily implemented also by multi-snapshot CASSI without any need for optical system modification.
据我们所知，我们提出了一种新颖的差分编码孔径快照光谱成像（D-CASSI）技术概念，该技术利用了使用{-1,+1}随机掩膜的优势，这通过一台使用压缩感知的宽带单快照高光谱相机得到了验证。为了使信息翻倍，我们用两个互补随机掩膜对图像进行编码，事实证明这比两个独立图案更具优势。我们利用在单个探测器上并行捕获的色散和非色散编码图像。我们探索了几种不同的方法来处理测量数据，这在检索复杂高光谱场景方面显示出显著改进。通过模拟完成实验以量化重建保真度。差分CASSI的概念也可以很容易地通过多快照CASSI实现，而无需对光学系统进行任何修改。
