Das visuelle System als Merkmalfilter

  • Axel Korn
Chapter
Part of the Fachberichte Messen · Steuern · Regeln book series (FACHBERICHTE, volume 13)

Feature Detection by the Visual System

Summery

The visual system is considered as an information processing system where the information processing task may consist in the localization and recognition of objects in the 3-dimensional physical world. After some definitions concerning terms like physical world and its projection, image,feature, and segmentation the processing in the first stages of the visual system (low-level vision) is discussed. A computational theory of retinal filtering is presented and related to the anatomy and physiology of the retina as well as to psychophysical results suggesting that a spatial-frequency filtering is performed in the human visual system. Furthermore neurophysiological and psycho-physical data suggest that the segmentation is the next stage after retinal processing. Here surface elements are extracted which follow from motion, texture, or the depth of objects (Stereopsis) relative to the observer. Some results of our simulation of low-level vision (retina, primary visual cortex) are presented for natural images. Particularly these results are related to the extraction of contour points, and edges for the reconstruction of the original gray values and the description of forms, and to the evaluation of statistical parameters for the description of textures in different spatial-frequency domains.

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1985

Authors and Affiliations

  • Axel Korn
    • 1
  1. 1.Fraunhofer-Institut für Informations- und DatenverarbeitungKarlsruhe 41Deutschland

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