Variable threshold zonal filtering.

  title={Variable threshold zonal filtering.},
  author={Alfred A. Schwartz and James M. Soha},
  journal={Applied optics},
  volume={16 7},
Variable threshold zonal filtering, in the context of the following discussion, is an active, nonlinear image enhancement process. This filtering technique is designed to avoid ringing artifacts which filtering can introduce near sharp brightness transitions in the original scene. It is a variation of the simple subtractive box filter. The removal of low frequency, large scale shading, which obscures more interesting local detail, is a common image processing problem. In cases where this… CONTINUE READING
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