a graphic image can be converted into a grayscale image, a grayscale image according to the high curvature points identified within the image, and the extreme point pattern, derived extrema of curvature and the radius of curvature

findcurve
.........\a.gif
.........\b.gif
.........\c.gif
.........\corner.jpg
.........\corner.m
.........\d.gif
.........\e.gif
.........\edge.jpg
.........\f.gif
.........\g.gif
.........\gui_corner.fig
.........\gui_corner.m
.........\h.gif
.........\house.bmp
.........\JOE057008.pdf

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