User recognition apparatus and method

A user recognition apparatus comprising:

• a visible-light image processing unit configured to acquire a visible-light image using a visible-light camera;
• an infrared-light image processing unit configured to acquire an infrared-light image using an infrared-light camera;
• a threshold value processing unit configured to remove a background of the infrared-light image using a brightness threshold, and generate a clipped infrared-light image;
• an optical flow processing unit configured to calculate an optical flow based on the clipped infrared-light image and the visible-light image, and generate a clipped visible-light image based on the calculated optical flow, wherein the optical flow processing unit extracts feature points of the user based on the clipped infrared-light image, and maps the extracted user feature points to the visible-light image to calculate an optical flow;
• and
• a visible light processing unit configured to recognize a user based on the clipped visible-light image.