Action recognition system and method thereof

A wearable device, being suitable for wearing on a wrist of a user, the wearable device comprising:

• a body;
• at least one light emitting unit disposed on an inner side of the body, the light emitting unit operable to emit a light beam illuminating at least a portion of the wrist;
• a Photoplethysmogram (PPG) sensor disposed on the inner side of the body, the PPG sensor operable to sense the light beam reflected by the at least a portion of the wrist and to generate a light sensing signal in responsive to a movement of the user;
• and
• an action recognition module, operable to process and analyze the received light sensing signal in responsive to the movement, and to identify and determine an action of the user according to the processed light sensing signal by performing an operation, so as to obtain the action, wherein the action includes a movement or a motion of each finger, up bending, down bending, left movement, and right movement of a palm, palm opening, hand grabbing or hand rotation operation;
• and
• a processing module operable to cause the wearable device to perform a function that corresponds to the action of the user.

A wearable device, being suitable for wearing on a wrist of a user, the wearable device comprising:

• a body;
• at least one light emitting unit disposed on an inner side of the body, the light emitting unit operable to emit a light beam illuminating at least a portion of the wrist;
• an optical sensor disposed on the inner side of the body, the optical sensor operable to sense the light beam reflected by the at least a portion of the wrist and to generate a light sensing signal in responsive to a movement of the user;
• and
• an action recognition module, operable to process and analyze the received light sensing signal in responsive to the movement, and to identify and determine an action of the user according to the processed light sensing signal, wherein the action includes a movement or a motion of each finger, up bending, down bending, left movement, and right movement of a palm, palm opening, hand grabbing or hand rotation operation;
• and
• a processing module operable to cause the wearable device to perform a function that corresponds to the action of the user.