CPC G01T 1/295 (2013.01) [G01T 1/161 (2013.01); G01T 1/167 (2013.01); G01V 5/0016 (2013.01); G21K 1/02 (2013.01); G21K 1/10 (2013.01)] | 29 Claims |
1. A coded mask for use in compressed sensing measurements of incoming radiation, the mask comprising:
a mask pattern comprising a plurality of open mask elements and a plurality of closed mask elements;
wherein the closed mask elements are of at least one material that modulates the intensity of the incoming radiation; and
the open mask elements allow a higher transmission of the radiation relative to the closed mask elements, the higher transmission being sufficient to allow reconstruction of an image from the compressed sensing measurements;
wherein the mask is configured to, in use, mask a radiation sensor at a location within or behind the mask;
the open mask elements are defined by mask apertures oriented towards the location of the sensor; and
in the case where the mask is a sphere, a part of a sphere, a segment of a sphere or a segment of a sphere between two planes, and the location of the sensor is at the center of the sphere, the apertures are tapered and are defined by one or more surfaces aligned with a direction of the sensor.
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