@INPROCEEDINGS{Pietaken86,

author = {N. Pietaken},
year = 1986,
title = {Edge Information in Color Images Based on Histograms of Differences},
booktitle = {Proc. Of the {IEEE} Int. Conf. Pattern Recognition},
pages = {594- 596.},
address = {Paris},
theme = {segmentation+contour}
 }