  It is demonstrated that an object distribution can be successfully retrieved
from its diffraction pattern or hologram, even if some of the measured
intensity samples are missing. The maximum allowable number of missing values
depends on the linear oversampling ratio s, where the higher the value of s,
the more intensity samples can be missing. For a real-valued object, the ratio
of missing pixels to the total number of pixels should not exceed (1 - 2/s^2)
or (1 - 1/s^2) in the acquired diffraction pattern or hologram, respectively.
For example, even 5% of the measured intensity values at an oversampling ratio
of s = 8 are sufficient to simultaneously retrieve the object distribution and
the missing intensity values. It is important that the missing intensity values
should not be concentrated in the centre, but should be randomly distributed
over the acquired diffraction pattern.
