System for performing ambient light image correction

A system for performing ambient light image correction, the system comprising:

• a light source configured to provide pulsed illumination to an object;
• a rolling shutter imaging unit configured to capture, while the object is illuminated by the pulsed illumination from the light source, a plurality of images of the object at an exposure time shorter than a wave period of the pulsed illumination, such that each of the plurality of captured images comprises a plurality of bright bands and a plurality of dark bands, wherein a bright band corresponds to a high state of the pulsed illumination and a dark band corresponds to a low state of the pulsed illumination;
• wherein a pulse frequency of the illumination provided by the light source is not a multiple integral of a frame rate at which the plurality of images are captured by the rolling shutter imaging unit, and
• wherein the system further comprises a control unit configured to:
• generate a first composite image comprising the plurality of bright bands from the plurality of captured images, by combining sections from the plurality of captured images which correspond to bright bands;
• generate a second composite image comprising the plurality of dark bands from the plurality of captured images, by combining sections from the plurality of captured images which correspond to dark bands;
• and
• generate an ambient light corrected image based on a difference in pixel information between the first composite image and the second composite image.