1. A system comprising: a detector; a combination of lenses and mirrors as imaging optics configured to provide for block-by-block compressive sensing of an imaged scene with the block by block determined by a plurality of shift-invariant masks to produce an image of the scene on the detector; wherein a resolution of the image being reflected through the combination of lenses and mirrors to the detector is greater than a resolution capability of the detector; and, a cold Dewar, wherein the combination of lenses and mirrors is further configured to operate in at least one of an on-state and an off-state to control reflectivity of at least one mirror of the mirrors so that the at least one mirror, when in the on-state, reflects a segment of the imaged scene to the detector and the at least one mirror, when in the off-state, directs a segment of an image of the cold Dewar onto the detector.