Three-dimensional sensing device and specular reflection object detection method

A three-dimensional (3D) sensing device configured to sense an object, the 3D sensing device comprising:

• a flood light source configured to emit a flood light to the object, wherein the object reflects the flood light into a first reflective light;
• a structured light source configured to emit a structured light to the object, wherein the object reflects the structured light into a second reflective light;
• an image sensor configured to sense the first reflective light and the second reflective light;
• and
• a controller electrically connected to the flood light source, the structured light, and the image sensor, and configured to perform:
• commanding the flood light source and the structured light source to emit the flood light and the structured light in sequence;
• commanding the image sensor to sense the first reflective light and the second reflective light in sequence, so as to obtain a first image frame corresponding to the first reflective light and a second image frame corresponding to the second reflective light;
• combining the first image frame and the second image frame into a determination frame;
• and
• determining that the object is a specular reflection object in response to determining that the determination frame has at least two spots having gray levels satisfying a predetermined condition.