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A Black-White Representation of a Gray-Scale Picture

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1 Author(s)
Morrin, T.H. ; IBM Advanced System Development Division Laboratory

A hardware-implemented algorithm combining dynamic thresholding and edge detection allows black-white representation of gray-scale images for computer storage. The output resembles a highly detailed sketch, with resolution and contrast superior to a halftone representation. The same algorithm can be applied to text and line drawings, so that all three types of images can be stored using the same compression algorithm.

Published in:

Computers, IEEE Transactions on  (Volume:C-23 ,  Issue: 2 )