The role of image size in the recognition of conversational facial expressions: Research Articles
Computer Animation and Virtual Worlds - Special Issue: The Very Best Papers from CASA 2004
Manipulating Video Sequences to Determine the Components of Conversational Facial Expressions
ACM Transactions on Applied Perception (TAP)
Perceptual Analysis of Level-of-Detail: The JND Approach
ISM '06 Proceedings of the Eighth IEEE International Symposium on Multimedia
Evaluation of real-world and computer-generated stylized facial expressions
ACM Transactions on Applied Perception (TAP)
Evaluating the perceptual realism of animated facial expressions
ACM Transactions on Applied Perception (TAP)
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Faces are a powerful and versatile communication channel. Physically, facial expressions contain a considerable amount of information, yet it is clear from stylized representations such as cartoons that not all of this information needs to be present for efficient processing of communicative intent. Here, we use a high-fidelity facial animation system to investigate the importance of two forms of spatial information (connectivity and the number of vertices) for the perception of intensity and the recognition of facial expressions. The simplest form of connectivity is point light faces. Since they show only the vertices, the motion and configuration of features can be seen but the higher-frequency spatial deformations cannot. In wireframe faces, additional information about spatial configuration and deformation is available. Finally, full-surface faces have the highest degree of static information. The results of two experiments are presented. In the first, the presence of motion was manipulated. In the second, the size of the images was varied. Overall, dynamic expressions performed better than static expressions and were largely impervious to the elimination of shape or connectivity information. Decreasing the size of the image had little effect until a critical size was reached. These results add to a growing body of evidence that shows the critical importance of dynamic information for processing of facial expressions: As long as motion information is present, very little spatial information is required.