CentOS 6.5 OpenCV compilation & execution problems

$echo `pkg-config --cflags --libs opencv`               
Package opencv was not found in the pkg-config search path.                    
Perhaps you should add the directory containing `opencv.pc'                    
to the PKG_CONFIG_PATH environment variable                                    
No package 'opencv' found  

$ ls /usr/local/lib/pkgconfig
libnl-1.pc  libnl-3.0.pc  libnl-cli-3.0.pc  libnl-genl-3.0.pc  libnl-nf-3.0.pc  libnl-route-3.0.pc  opencv.pc

$export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

$ echo `pkg-config --cflags --libs opencv`

-I/usr/local/include/opencv -I/usr/local/include /usr/local/lib/libopencv_calib3d.so /usr/local/lib/libopencv_contrib.so /usr/local/lib/libopencv_core.so /usr/local/lib/libopencv_features2d.so /usr/local/lib/libopencv_flann.so /usr/local/lib/libopencv_gpu.so /usr/local/lib/libopencv_highgui.so /usr/local/lib/libopencv_imgproc.so /usr/local/lib/libopencv_legacy.so /usr/local/lib/libopencv_ml.so /usr/local/lib/libopencv_nonfree.so /usr/local/lib/libopencv_objdetect.so /usr/local/lib/libopencv_ocl.so /usr/local/lib/libopencv_photo.so /usr/local/lib/libopencv_stitching.so /usr/local/lib/libopencv_superres.so /usr/local/lib/libopencv_ts.a /usr/local/lib/libopencv_video.so /usr/local/lib/libopencv_videostab.so -lrt -lpthread -lm -ldl   


$g++ letter_recog.cpp -o letter_recog `pkg-config --cflags --libs opencv`



$./letter_recog                                                                                              
./letter_recog: error while loading shared libraries: libopencv_calib3d.so.2.4: cannot open shared object file: No such file or directory
                                                                                                                 
$export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/lib  

Morphological operations using OpenCV

cv::erode(image,eroded,cv::Mat(),cv::Point(-1,-1),3); //3 times

cv::dilate(image,dilated,cv::Mat(),cv::Point(-1,-1),3);  //3 times

References
[1] http://www.packtpub.com/article/opencv-image-processing-morphological-filters
[2] http://qtandopencv.blogspot.com/2013/09/morphological-operations-and-opencv2-00.html

OpenCV 2.4 - Visual Studio 10 - Setting

Configuration Properties
C/C++
  +  General settings
     +  Additional include properties (*.h/*.hpp)
VC++ Directory
  + Library Directories (*.lib)
Linker
  + Additional dependencies (namep.lib nameq.lib namer.lib ... )

OpenCV Linux

http://linuxconfig.org/introduction-to-computer-vision-with-opencv-on-linux

Resources:
http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/