azrael wrote: > Help, I'm going mad with this
Is "Otsu threshold algorithm" to boring as a subject? > Meanwhile I tried about 5 different implementations of the otsu > threshold algorithm. I'll go mad. > Please help me. I don't know what to do. I even tried to implement it > from c and java, but no way. nothing. > I've been reading about 5 ppt presentations and 4 pdf's and I failed. > Can someone look at this code. > If needed I can paste 3 other codes. Hmm, you just learned that quality is more important than quantity then. Choose the text that seems most accessible while still complete and try to understand it. > if __name__=="__main__": > otsu(histogram) You are using a parameter before defining it. It seems you have not yet groked the basics of cut and past then. > histogram= [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, > 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, > 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, > 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, > 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, > 0, 0, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0, 2, 1, 2, 0, 1, 3, 3, 3, 3, 1, 3, > 1, 3, 5, 2, 3, 3, 3, 6, 3, 4, 5, 4, 9, 6, 11, 6, 10, 3, 11, 9, 9, 12, > 22, 18, 34, 22, 28, 32, 25, 34, 38, 34, 54, 65, 106, 160, 167, 203, > 282, 364, 446, 637, 816, 1022, 1264, 1456, 1646, 1753, 1845, 1922, > 2203, 2231, 1973, 2245, 2369, 2349, 2258, 2130, 2066, 1835, 1640, > 1554, 1414, 1179, 1024, 974, 938, 838, 785, 756, 803, 921, 952, 865, > 722, 625, 608, 547, 498, 412, 438, 408, 413, 415, 339, 366, 330, 320, > 293, 315, 368, 411, 434, 500, 531, 538, 552, 665, 811, 869, 998, 1021, > 1075, 1080, 1030, 934, 926, 1074, 942, 941, 1014, 1440, 2966, 5301, > 2729, 3400, 5563, 13096, 9068, 6045, 2813, 686, 180] > > > Well, this list is a example list that i have exported. for this list > the result the threshold should be at 218. If you need the result and don't want to bother with understanding the algorithm -- I found an implementation in C via Google Codesearch http://www.google.com/codesearch?hl=de&q=+otsu+threshold+show:3rXPo8eEzw0:z-1MzowD-bQ:cDGSVzqKA7M&sa=N&cd=1&ct=rc&cs_p=http://www.studio-to-go.co.uk/source-packages/2.x/gocr-0.41.tar.bz2&cs_f=gocr-0.41/src/otsu.c#a0 It gives the desired result if you use the line that is commented out // orig: sb ... instead of its current replacement. Translation to Python should be straightforward, but you can ask on c.l.py if you run into problems. Peter -- http://mail.python.org/mailman/listinfo/python-list
