Method for subtracting background light from an exposure value of a pixel in an imaging array, and pixel for use in same

A method for subtracting background light from an exposure value of a pixel in an imaging array, said pixel receiving a reflection of a spot from a scenery illuminated by a periodically pulsed pattern of spots, said periodically pulsed pattern comprising in alternation an illuminated phase and a non-illuminated phase, the method comprising:

• accumulating in said pixel a charge in proportion to a first quantity of incident light, received in a photosensitive element of said pixel while detecting said spot during a predetermined amount of time;
• and
• decreasing said charge in proportion to a second quantity of incident light received during said predetermined amount of time in absence of said spot;
• wherein said second quantity of incident light comprises light received in said photosensitive element of said pixel during said predetermined amount of time in said non-illuminated phase.