公开(公告)号：US20250168475A1

公开(公告)日：2025-05-22

申请号：US18884873

申请日：2024-09-13

Applicant: Axis AB

Inventor： Stefan LUNDBERG ,  Kajsa Larsson ,  Kent Fransson

IPC: H04N23/20 ,  H04N23/71 ,  H04N23/74

Abstract: A method and a video capturing system for controlling at least one infrared (IR) illumination source, illuminating an area captured by a camera, the method comprising modulating emission from the IR illumination source between first and second emission intensities at a first frequency during a first predetermined time period. Upon capturing images using an image sensor of the camera during the first predetermined time period, determining a radiation level indicator for each of a plurality of images captured by the image sensor. Further, evaluating a sequence of determined radiation level indicators to determine whether a frequency resulting from the modulated emission at the first frequency is detected in the sequence of radiation level indicators. If the frequency resulting from the modulated emission at the first frequency is determined as not detected in the sequence of radiation level indicators, the IR illumination source is stopped.