IEEE Transactions on Visualization and Computer Graphics, 15(4):642-653,2009.
[DOI: 10.1109/TVCG.2009.21] [Preprint]
An algorithm is presented to automatically generate bas-reliefs based
on adaptive histogram equalisation (AHE), starting from an input
height field. A mesh model may alternatively be provided, in which
case a height field is first created via orthogonal or perspective
projection. The height field is regularly gridded and treated as an
image, enabling a modified AHE method to be used to generate a
bas-relief with a user-chosen height range. We modify the original
image-contrast-enhancement AHE method to also use gradient weights, to
enhance the shape features of the bas-relief. To effectively compress
the height field, we limit the height-dependent scaling factors used
to compute relative height variations in the output from height
variations in the input; this prevents any height differences from
having too great an effect. Results of AHE over different
neighbourhood sizes are averaged to preserve information at different
scales in the resulting bas-relief. Compared to previous approaches,
the proposed algorithm is simple and yet largely preserves original
shape features. Experiments show that our results are in general
comparable to and in some cases better than the best previously
published methods.
@ARTICLE{Sun2009a,
author = {Xianfang Sun and Paul L. Rosin and Ralph R. Martin
and Frank C. Langbein},
title = {Bas-Relief Generation Using Adaptive Histogram
Equalisation},
journal = {IEEE Trans. Visualization and Computer Graphics},
volume = {15},
issue = {4},
pages = {642--653},
year = {2009},
abstract = {An algorithm is presented to automatically generate
bas-reliefs based on adaptive histogram equalisation
(AHE), starting from an input height field. A mesh
model may alternatively be provided, in which case a
height field is first created via orthogonal or
perspective projection. The height field is
regularly gridded and treated as an image, enabling
a modified AHE method to be used to generate a
bas-relief with a user-chosen height range. We
modify the original image-contrast-enhancement AHE
method to also use gradient weights, to enhance the
shape features of the bas-relief. To effectively
compress the height field, we limit the
height-dependent scaling factors used to compute
relative height variations in the output from height
variations in the input; this prevents any height
differences from having too great an effect. Results
of AHE over different neighbourhood sizes are
averaged to preserve information at different scales
in the resulting bas-relief. Compared to previous
approaches, the proposed algorithm is simple and yet
largely preserves original shape features.
Experiments show that our results are in general
comparable to and in some cases better than the best
previously published methods.},
}
Bas-Relief Generation Using Adaptive Histogram Equalisation,http://www.langbein.org/research/manifolds/filtering/brg by Frank C Langbein [ 6/August/2009, 13:31].
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