Video conferencing device and image analysis method thereof

A video conferencing device for determining a security mode by processing a video stream provided through a camera, comprising:

• an image converter configured to sample, from the video stream, a video frame;
• and
• an image analyzer configured to:
• detect, in the video frame, at least one face and an object;
• and
• select the security mode by detecting whether a number of people, a number of faces, and facial features in the video frame correspond to an authorized person, and based on another security mode corresponding to a previous frame of the video stream,
• wherein the image analyzer is further configured to select the security mode by referring to information of the authorized person extracted from at least one previous video frame based on the at least one face not being recognized in the video frame.

A video analysis method for determining a security mode of a video stream, comprising:

• detecting a number of people, a number of faces, and at least one facial feature in a frame sampled from the video stream;
• and
• selecting the security mode based on at least one of the number of people, the number of faces, whether the at least one facial feature corresponds to an authorized person, and another security mode corresponding to a previous frame of the video stream,
• wherein the selecting of the security mode comprises determining, based on a face not being recognized in the frame, the security mode of the frame according to information about the authorized person detected in at least one previous frame sampled prior to the frame.