c++ - OPENCV training cascade "out of range" -


i'm trying train own detector using opencv 3.0 traincascade. have 82 positive , 188 negative sample , following 

 opencv_traincascade -data data -vec signals.vec -bg negative.txt -numpos 82 -numneg 188 -numstages 20 -w 50 -h 50 -featuretype lbp

i'm able reach stage 8. @ stage 9 have following error

    ===== training 9-stage ===== <begin pos count : consumed   82 : 82 neg cterminate called after throwing instance of 'std::out_of_range'   what():  basic_string::substr aborted (core dumped)149

someone knows why? thank in advance.

the short answer - don't have enough negative samples selected maxfalsealarm , numstages parameters. have 3 options (starting best):

  • provide more negative samples (imho it's best option - it's not hard , give best results)
  • decrease value of maxfalsealarm parameter (you can find here)
  • decrease number of stages

if remember correct (better check it..) should have @ least (1-maxfalsealarm)^(numstages-1) (where '^' power, not xor) negative samples complete training.


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