Topographic Maps and Local Contrast Changes in Natural Images

摘要: We call “natural” image any photograph of an outdoor or indoor scene taken by a standard camera. discuss the physical generation process natural images as combination occlusions, transparencies and contrast changes. This description fits to phenomenological Gaetano Kanizsa according which visual perception tends remain stable with respect these basic operations. define invariant presentation digital image, topographic map, where subjacent occlusion-transparency structure is put into evidence interplay level lines. prove that each map represents class local Several visualization strategies are proposed implemented mathematical arguments developed establish stability properties under digitization.