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Image Enhancement

  • By: Jinfei Wang
  • In: Encyclopedia of Geography
  • Edited by: Barney Warf
  • Subject:General Geography, Earth & Environmental Science

Image enhancement is applied to improve the overall visual quality of an image—to smooth or sharpen image features such as edges for better visual interpretation or better subsequent digital image analysis. It is applied to many types of images, such as medical images, digital photography, and remotely sensed imagery.

In geography, Earth's surface information can be obtained by the interpretation and understanding of images acquired from sensor devices on board satellites and airplanes. Recently, many new remote sensors have been developed that can detect electromagnetic signals in different wavelength ranges with various spatial and spectral resolutions. However, the original images delivered to general users may not display all the surface objects clearly. Human analysts may not be able to distinguish slight brightness differences for different objects ...

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