An improvement design of a smartphone interface and image processing methods to reduce uncomfortable light from a digital projector

In this paper we propose an improvement design to integrate a combination of both a smartphone and a projector to reduce uncomfortable light emitting from a digital projector. The smartphone executes the face detection module, and superimposes the black mask in the position of the face to reduce all uncomfortable light shining in the speaker's eye. This design uses the skin color detection and background subtraction methods to increase the face recognition rate of the previous design. In addition, this design also provides the face detection method for multiple users, so that the projector simultaneously places multiple black masks, and each mask is superimposed for each user's face.