1. An image sensor array comprising: a plurality of pixel structures, at least one pixel structure including: a photosensitive element for generating a signal in response to electromagnetic radiation, the signal including phase information; and a phase integrator, coupled to the photosensitive element, for integrating the phase information of the signal provided by the photosensitive element over an exposure time period that is determined in response to an integrated value of the phase information; and wherein at least one pixel structure is adapted to avoid saturation when the signals from the photosensitive element are large.