Optical sensing system and optical sensing method

An optical sensing system, comprising:

• a bright-field light source;
• a dark-field light source;
• an optical detecting circuit;
• and
• a processing circuit configured to perform a floor type detection process, including:
• controlling the dark-field light source to provide dark-field illumination on a floor in the target area;
• receiving, by the optical detecting circuit, scattered lights of the dark-field light source from the floor in the target area;
• executing a dark-field computation process to obtain a first optical characteristic of the target area according to the scattered lights of the dark-field light source received, and determining whether or not the first optical characteristic meets a first surface condition;
• in response to determining that the optical characteristic of the floor in the target area does not meet the first surface condition, determining that a floor type of the floor in the target area is a first type;
• in response to determining that the optical characteristic of the floor in the target area meets the first surface condition, controlling the bright-field light source to provide bright-field illumination on the floor in the target area;
• receiving, by the optical detecting circuit, scattered lights of the bright-field light source from the floor in the target area;
• executing a bright-field computation process to obtain a second optical characteristic of the target area according to the scattered lights of the bright-field light source received, and determining whether or not the second optical characteristic meets a second surface condition;
• and
• in response to determining that the second optical characteristic meets a second surface condition, determining that the floor type of the floor in the target area is a second type.