13. The computer program product of claim 10 , wherein the deriving of the IGH comprises obtaining an uncertainty involved in the IGH representation for talking segments as compared to non-talking segments.
10. A computer program product for detecting and classifying talking segments of a face in a visual cue, the product comprising: an integrated circuit further comprising at least one processor; at least one memory having a computer program code within the integrated circuit; the at least one memory and the computer program product configured to, with the at least one processor, cause the product to: normalize and localize a face region for each frame of the visual cue; obtain a histogram of structure descriptive features for the frame in the visual cue; derive an integrated gradient histogram (IGH) from the descriptive features for the frame in the visual cue; compute entropy of the IGH for the frame in the visual cue; perform segmentation of the IGH to detect talking segments for the face in the visual cue; and analyze the segments for the frame in the visual cue for inferring emotions.