Analysis of the Edge Effect
of
Error Propagation in
Digital Halftones
Sunadi P Gunawan
The purpose of this research is to study quantitatively edge enhancement
effects of different digital halftone algorithms, especially on Error diffusion
and Linear Pixel Shuffling algorithms. It has been known that by changing the
amount of error and the spread of error when processing original images,
different edge enhancement effects are observed. In many cases sometimes an
unsymmetrical edge enhancement phenomenon occurs at the junction of
different gray levels. A new metric for describing edge enhancement effects is
introduced. This metric is shown to
be consistent and reliable. In order to describe the unsymmetrical edge
enhancement phenomenon in some cases, a new unsymmetrical metric is introduced.
Both of these metrics are expected to provide useful quantitative measurements
of edge enhancement effects in various different halftone algorithms.