Use of visible light signals for determining one or more parameters for presence detection

A system for determining one or more presense sensor sensitivity parameters for presence detection, said system comprising:

• at least one input interface;
• at least one output interface;
• and
• at least one processor configured to:
• obtain a plurality of locations of a mobile device, said said plurality of locations being determined using visible light signals and dead reckoning information recorded at a plurality of moments,
• use said at least one input interface to obtain presence detection information, said presence detection information indicating presence detected using a plurality of presence sensor devices at said plurality of moments,
• obtain sensor locations and sensor fields of view of said plurality of presence sensor devices,
• determine sensor orientations of said plurality of presence sensor devices based on said locations of said mobile device, said sensor locations and said presence detection information,
• determine a sensor coverage area of said plurality of presence sensor devices, comprising gaps in said sensor coverage area, based on said sensor locations, said sensor orientations and said sensor fields of view,
• determine one or more presence sensor sensitiviy parameters for presence detection based on said gaps in said sensor coverage area, and
• use said at least one output interface to output said one or more presence sensor sensitivity parameters or a presence detection result which has been determined using said one or more presence sensor sensitivity parameters.