  Coded aperture snapshot spectral imaging (CASSI) makes it possible to recover
3D hyperspectral data from a single 2D image. However, the reconstruction
problem is severely underdetermined and efforts to improve the compression
ratio typically make the imaging system more complex and cause a significant
loss of incoming light intensity. In this paper, we propose a novel approach to
CASSI which enables capturing both spectrally sheared and integrated image of a
scene with a single camera. We performed hyperspectral imaging of three
different testing scenes in the spectral range of 500-900 nm. We demonstrate
the prominent effect of using the non-diffracted image on the reconstruction of
data from our camera. The use of the spectrally integrated image improves the
reconstruction quality and we observed an approx. fivefold reduction in
reconstruction time.
