1. Image segmentation by pixel classification in {gray level, edge value} space;Panda;IEEE Trans. Computers,1978
2. Histogram modification for threshold selection;Weszka;IEEE Trans. Syst. Man Cybernet.,1979
3. Extraction de contours par histogramme bidimensionnel;Wegmann,1980
4. Clustering edge values for threshold selection;Milgram;Computer Graphics and Image Processing,1979
5. Edge/border coincidence as an aid in edge extraction;Nakagawa;IEEE Trans. Syst Man Cybernet.,1978