  AstroSat is India's first space-based astronomical observatory, launched on
September 28, 2015. One of the payloads aboard AstroSat is the Cadmium Zinc
Telluride Imager (CZTI), operating at hard X-rays. CZTI employs a
two-dimensional coded aperture mask for the purpose of imaging. In this paper,
we discuss various image reconstruction algorithms adopted for the test and
calibration of the imaging capability of CZTI and present results from CZTI
on-ground as well as in-orbit image calibration.
