ABSTRACT
INTRODUCTION In this chapter, we consider what information is available to the human visual system in cases of Œat and nonŒat surfaces. In the case of Œat surfaces, visual cues can be interpreted without any reference to surface shape; under many conditions, cue integration is well described by a linear rule; moreover, it is possible to propagate cues along the surface to the locations where visual information is poor or missing. In the general case of nonŒat surfaces, cue interpretation depends on surface shape. In such situations,
CONTENTS Introduction 95 Cue Integration 97
Classical Cue Integration Framework 97 Cue ConŒict 98
Example of Robust Cue Integration 99 Cue Promotion 101
Cue Propagation in the Case of Noisy Cues 102 Cue Interpretation for NonŒat Surfaces 107 Conclusions 111 Acknowledgment 111
the visual system can interpret surface cues in at least two diŠerent ways: shape can be ignored (i.e., a planar approximation is used instead) or surface shape can be estimated beforehand to explain away the eŠect of shape on interpretation of visual cues.
