The contents of an image can only be revealed when we analyze the spatial relations of the gray values. If the gray value does not change in a small neighborhood, we are within an area of constant gray values. This could mean that the neighborhood is included in an object. If the gray value changes, we might be at the edge of an object. In this way, we recognize areas of constant gray values and edges.


Impulse Response Point Spread Function Filter Operation Analog Filter Inverse Filter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Bernd Jähne
    • 1
  1. 1.Scripps Institution of Oceanography Physical Oceanography Research Division A-030University of California San DiegoLa JollaUSA

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