Visual speech detection using facial landmarks

A data processing apparatus for detecting a probability of speech based on video data is disclosed. The data processing apparatus may include at least one processor, and a non-transitory computer-readable storage medium including instructions executable by the at least one processor, where execution of the instructions by the at least one processor causes the data processing apparatus to execute a visual speech detector. The visual speech detector may be configured to receive a coordinate-based signal. The coordinate-based signal may represent movement or lack of movement of at least one facial landmark of a person in a video signal. The visual speech detector may be configured to compute a probability of speech of the person based on the coordinate-based signal.