The original image.
Result of Euclidean distance transforming art5
(and then pixel multiplying by 5.
Result of skeletonizing art5.
The medial axis transform of art5.
Result of image editing art5.
Result of skeletonizing art5cha1 (using an algorithm which does not guarantee a connected skeleton).
Result of skeletonizing art5cha1.
Result of image editing art5.
The brightened (by a factor of 6)
distance transform of art5cha2.
Result of adding pepper noise to
art5.
The brightened (by a factor of 15)
distance transform of art5noi1.
Result of skeletonizing art5noi1.
Result of frequency filtering art5 with
an ideal lowpass filter with a cut-off of
.
Result of histogram equalizing art5low1.
Result of frequency filtering art5 with an
ideal lowpass filter with a cut-off of .
Result of frequency filtering art5 with a
Butterworth filter with a cut-off of .