Light-field imaging based on tilt-aberration

An imaging system comprising:

• a source of electromagnetic radiation;
• an electromagnetic radiation detector;
• a first and a second filters;
• a computer processor;
• and
• a memory containing computer-implemented instructions that when carried out by said computer processor executes the steps;
• capturing at a first incoherent tilt aberration a first wave field intensity map of a target, using said first filter having an attenuation profile with a continuous derivative positioned between said source of electromagnetic radiation and said electromagnetic radiation detector capturing said first wave field intensity map,
• capturing at a second incoherent tilt aberration a second wave field intensity map of said target, using said second filter having an attenuation profile with a continuous derivative positioned between a source of electromagnetic radiation and an electromagnetic radiation detector capturing said second wave field intensity map, wherein said second incoherent tilt aberration is different from said first incoherent tilt aberration,
• determining said transverse phase gradient on the basis of at least a difference of logarithms of wavefield intensity maps divided by the magnitude of the difference between said first incoherent tilt aberration and said second incoherent tilt aberration,
• wherein said difference of logarithms of wavefield intensity maps is a difference between a logarithm of an intensity of said first wave field intensity map and a logarithm of an intensity of said second wave field intensity map
• wherein said imaging system is configured to be adjustable between a first degree of tilt and a second degree of tilt.