Movable carrier auxiliary system and control method thereof

A movable carrier auxiliary system, comprising:

• an environment detecting device comprising at least one image capturing module, a storage module, and an operation module;
• wherein the at least one image capturing module is disposed at a movable carrier for capturing an environment image around the movable carrier;
• the storage module stores a plurality of image models;
• the operation module is electrically connected to the at least one image capturing module and the storage module to detect whether the environment image has an image that matches at least one of the image models or not, and to generate a corresponding detection signal;
• wherein the at least one image capturing module has a lens group;
• the lens group comprises at least two lenses having refractive power and satisfies:
• 1.0≤f/HEP<10.0;
• 0 deg<HAF≤150 deg;
• and
• 0.9≤2(ARE/HEP)≤2.0;
• wherein f is a focal length of the lens group;
• HEP is an entrance pupil diameter of the lens group;
• HAF is a half of a maximum field angle of the lens group;
• ARE is a profile curve length measured from a start point where an optical axis of the lens group passes through any surface of one of the at least two lenses, along a surface profile of the corresponding lens, and finally to a coordinate point, from which a vertical distance to the optical axis is half of the entrance pupil diameter.