c++ compile error when I try to learn opencv_train_features

E_Jovi Published at Dev

E_Jovi

I'm jackaroo to learn how to train features of opencv, and I refer to these under url.

http://coding-robin.de/2013/07/22/train-your-own-opencv-haar-classifier.html

And above article author recommand to learn with his project, like here.

https://github.com/mrnugget/opencv-haar-classifier-training

And I study step by step, but in the same mould after I copy mergevec.cpp to my opencv apps's directory, like this

cp src/mergevec.cpp ~/opencv-2.4.9/apps/haartraining
cd ~/opencv-2.4.9/apps/haartraining

And then, I want to obtain executable file mergevec by using the following methods

g++ `pkg-config --libs --cflags opencv` -I. -o mergevec mergevec.cpp\
cvboost.cpp cvcommon.cpp cvsamples.cpp cvhaarclassifier.cpp\
cvhaartraining.cpp\
-lopencv_core -lopencv_calib3d -lopencv_imgproc -lopencv_highgui -lopencv_objdetect

And I get error

/tmp/cc9GpmMW.o: In function `JpgDatasetGenerator::JpgDatasetGenerator(char const*)':
cvhaartraining.cpp:(.text+0xafd5): undefined reference to `IOutput::createOutput(char const*, IOutput::OutputType)'
/tmp/cc9GpmMW.o: In function `PngDatasetGenerator::PngDatasetGenerator(char const*)':
cvhaartraining.cpp:(.text+0xb24d): undefined reference to `IOutput::createOutput(char const*, IOutput::OutputType)'
cvhaartraining.cpp:(.text+0xb24d): undefined reference to `IOutput::createOutput(char const*, IOutput::OutputType)'

I try to sovle the problem by looking through opecv forum's articles and found almost nothing.

So, um, could anybody help me? thanks a lot..

Saulo Maciel

IOutput is an interface where their methods are declared at ioutput.h and must be implemented somewhere. I found out they were implemented at cvsamplesoutput.cpp so we just need ask gcc to compile that file. For that the correct command should be:

g++ `pkg-config --libs --cflags opencv` -I. -o mergevec mergevec.cpp\
cvboost.cpp cvcommon.cpp cvsamples.cpp cvhaarclassifier.cpp\
cvhaartraining.cpp cvsamplesoutput.cpp\
-lopencv_core -lopencv_calib3d -lopencv_imgproc -lopencv_highgui -lopencv_objdetect

Collected from the Internet

Please contact [email protected] to delete if infringement.