1. A method for detecting and classifying talking segments of a face in a visual cue in order to infer emotions, the method comprising: normalizing and localizing a face region for each frame of the visual cue; obtaining a histogram of structure descriptive features of the face for the frame in the visual cue; deriving an integrated gradient histogram (IGH) from the descriptive features for the frame in the visual cue; computing entropy of the IGH for the frame in the visual cue; performing segmentation of the IGH to detect talking segments for the face in the visual cues; and analyzing the segments for the frame in the visual cues to infer emotions.