SURF detector error in opencv 2.4.2

asked 2013-03-08 03:18:49 -0600

Heshan Sandeepa

339 ●3 ●7 ●18

updated 2013-03-08 03:20:20 -0600

hi ,

i tried the following tutorial here. link text

that gives me following 2 errors when running the code, i am using opencv 2.4.2 in visual studio 2010.

error LNK1120: 1 unresolved externals
error LNK2019: unresolved external symbol "public: __cdecl cv::SURF::SURF(double,int,int,bool,bool)" (??0SURF@cv@@QEAA@NHH_N0@Z) referenced in function main

can any one tell me what kind of problem is that?

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answered 2013-03-08 03:39:40 -0600

Guanta
6736 ●6 ●25 ●79

Did you maybe forgot to call cv::initModule_nonfree() ? Also note that you should consider to switch to the latest OpenCV version since several bugs have been fixed since 2.4.2.

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thank you very much for considering my problem and spent your time to solve that. It helped me a lot.

Heshan Sandeepa ( 2013-03-08 07:11:37 -0600 )edit

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answered 2013-03-08 03:44:02 -0600

berak
32993 ●7 ●81 ●312

the demo would not even compile for me (with 242), save link.

it needed the following additions:

#include "opencv2/nonfree/nonfree.hpp"   // SURF is nonfree

before doing anything else in main():

cv::initModule_nonfree();

and ofc link to opencv_nonfree242.lib

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thank you very much for considering my problem and spent your time to solve that. it worked. do you think that opencv 2.4.4 is always better than 2.4.2?

Heshan Sandeepa ( 2013-03-08 07:15:39 -0600 )edit

BRISK detectors, mjpg streams were the reasons for me to upgrade. but i went for compiling from github master this time (2.4.9) so i don't know if 2.4.4 really stable already(they removed the 'beta' tag only days ago.. )

berak ( 2013-03-08 09:22:11 -0600 )edit

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SURF detector error in opencv 2.4.2

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