1. A method of multi-aperture image processing, comprising: obtaining first image data, wherein the first image data is obtained using inputs from multiple apertures, which inputs are up-converted to optical frequencies using respective optical signals that are phase-locked with respect to one another; obtaining second image data, wherein the second image data is obtained using inputs from the multiple apertures, which inputs are up-converted to optical frequencies using respective optical signals that are not phase-locked with respect to one another; subtracting the second image data from the first image data to obtain output image data; obtaining at least third image data, wherein the at least third image data is obtained using inputs from the multiple apertures, which inputs are up-converted to optical frequencies using respective optical signals that are phase-locked with respect to one another; and subtracting the second image data from the at least third image data to obtain at least second output image data.