Clonebrushing (a.k.a. rubberstamping) is one of the most powerful
tools for the seamless alteration of pictures. It interactively
copiesaregionoftheimageusingabrushinterface. Itisoftenused
to remove undesirable portions of an image, such as blemishes or
distracting objects in the background. The user chooses a source
region of the image and then paints over the destination region using
a brush that copies from the source to the destination region.
However, clone brushing has its limitations when object shape or
perspective causes texture foreshortening: Only parts of the image
with similar orientation and distance can be clone brushed. Artifactsalsoappearwhentheintensityofthetargetandsourceregions
do not match.
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