... module and to simulate bimodal and multimodal emotion recognition, we used four kinds of emotions or musical moods in each experiment: neutral, happy, angry, and sad. We chose ‘angry’ and ‘sad’ ... humans and robots. 5.3. Evaluation of the expression system In the proposed affective interaction, the expression system provides a natural and intermediate interface between humans and service ... facial features indicating color and shape, and then groups them into face candidates based on the geometric relationship of the facial features. Finally, a candidate region is decided as a...