Patent ID: 11936973
Assignee: LUMILEDS, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 18:
19. A controller comprising:
at least one processor configured to:
receive sensor signals from an infrared-sensitive image sensor, the sensor signals generated by illumination of a plurality of image regions of a scene illuminated by an array of individually addressable infrared-emitting LEDs;
analyze, during a current frame, a preliminary image of the scene illuminated during a previous frame to determine exposure levels for each of the plurality of image regions, the preliminary image obtained using pulses of a preliminary switching pulse train to drive each infrared-emitting LED during a scan sequence in which the preliminary image is captured; and
generate, for transmission to an adjusting unit, adjustment signals to adjust driving during the current frame of each of the individually addressable infrared-emitting LEDs based on the exposure levels to obtain a final image, the preliminary switching pulse train having a shorter duration than a final switching pulse train used to drive the infrared-emitting LED to obtain the final image, the pulses of the preliminary switching pulse train having a shorter pulse width than pulses of the final switching pulse train.