Surveillance system, information processing device, fall detection method, and non-transitory computer readable medium

A fall detection method comprising:

• receiving, from a LiDAR sensor having emitted a plurality of laser beams with different ranges to a surveillance area, a detection signal indicating a detection status of an object by each of the laser beams;
• recognizing the object in a captured image captured using a camera;
• and
• determining that the object has fallen down when the detection status by a laser beam with a shorter range than a predetermined range indicates that the object is detected and the number of laser beams detecting the object decreases and when timing when the number of laser beams detecting the object decreases and timing when the object becomes not recognized in the captured image where the object has been recognized are within a predetermined range.

A non-transitory computer readable medium storing a program causing a computer to execute:

• receiving, from a LiDAR sensor having emitted a plurality of laser beams with different ranges to a surveillance area, a detection signal indicating a detection status of an object by each of the laser beams;
• recognizing the object in a captured image captured using a camera;
• and
• determining that the object has fallen down when the detection status by a laser beam with a shorter range than a predetermined range indicates that the object is detected and the number of laser beams detecting the object decreases and when timing when the number of laser beams detecting the object decreases and timing when the object becomes not recognized in the captured image where the object has been recognized are within a predetermined range.