Method for controlling infrared illumination source

A non-volatile computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out a method 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 a first emission intensity and a second emission intensity at a first frequency during a first predetermined time period, capturing images using an image sensor of the camera during the first predetermined time period, determining a radiation level indicator for each one of a plurality of the images captured by the image sensor, evaluating a sequence of determined radiation level indicators to determine whether a frequency resulting from the modulated emission at the first frequency is detected or not in the sequence of radiation level indicators, if the evaluation determines that the frequency resulting from the modulated emission at the first frequency is not detected in the sequence of radiation level indicators, the IR illumination source is stopped from lighting the area captured by the camera.