Mryka Hall-Beyer

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What is texture?   The GLCM  Texture Calculations  Practical Notes   More Information and References

 Exercises   Examples   Equations


What is texture?

Everyday texture terms - rough, silky, bumpy - refer to touch.

A texture that is rough to touch has:

  • a large difference between high and low points, and
  • a space between highs and lows approximately the same size as a finger.
Silky would have
  • little difference between high and low points, and
  • the differences would be spaced very close together relative to finger size.
Image texture works in the same way, except the highs and lows are brightness values (also called grey levels, GL,  or digital numbers, DN) instead of elevation changes. Instead of probing a finger over the surface, a "window" - a (usually square) box defining the size of the probe - is used.
 

Textures in images quantify:

  • Grey level differences (contrast)
  • Defined size of area where change occurs (window)
  • Directionality or lack of it

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