You need to set environment variable as this configuration is not ordinary.
Sample codes can be found at
http://docs.opencv.org/3.2.0/
or simply
/tmp/iit/usr/share/OpenCV/samples/cpp
http://docs.opencv.org/3.2.0/
Click: OpenCV Tutorials
Click: Instruction to OpenCV
Click: Using OpenCV with gcc and CMake
http://docs.opencv.org/3.2.0/db/df5/tutorial_linux_gcc_cmake.html
The compiled executables that you made are found at
file:///tmp/iit/work/opencv/build-2017mdd--hhss/bin
You should aware that the name of the executables are with "cpp-example-" prefix.
To enjoy sample programs, you should run them at the source tree.
(As the data files are there.)
| Terminal: Shell |
cd /tmp/iit/work/openv/build-2017mmdd-hhss/bin ls ls cpp-examples-* ls ../../samples/cpp/ cd ../../samples/cpp ls ../../build-2017mmdd-hhss/bin # Ready? # Try one by one, some works well, some are not. # Without options, they may show help. # (if you bring a USB camera, you should have more fun!) # for example, less squares.cpp # and run ../../build-2017mmdd-hhss/bin/cpp-examples-squares |
| CMakeLists.txt |
cmake_minimum_required(VERSION 2.8)
project( IIT-DisplayImage )
# One of two lines is needed
set( CMAKE_PREFIX_PATH "/tmp/iit/usr/share" )
set( OpenCV_DIR "/tmp/iit/usr/share/OpenCV" )
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )
|
| Terminal: Shell |
cd cd iit-tool-a mkdir 05 cd 05 mkdir DisplayImage cd DisplayImage # write a program (or just download it) gedit DisplayImage.cpp # prepare CMakeLists.txt gedit CMakeLists.txt # down one step mkdir build-0 cd build-0 cmake ../ make # check 1 ls -l # check 2: what is "ldd"? ldd DisplayImage # prepare data cp /tmp/iit/work/opencv/samples/data/lena.jpg .. # run ./DisplayImage ../lena.jpg |
| Terminal: Shell |
cd cd iit-tool-a/05/DisplayImage # pkg-config, a tool to know proper compile options # (only once for a shell) PKG_CONFIG_PATH=/tmp/iit/usr/lib/pkgconfig export PKG_CONFIG_PATH # On compile pkg-config opencv --cflags # On link pkg-config opencv --libs # For simple file pkg-config opencv --cflags --libs # So, fully g++ -Wall DisplayImage.cpp \ -I/tmp/iit/usr/include/opencv \ -I/tmp/iit/usr/include \ -L/tmp/iit/usr/lib \ -lopencv_stitching -lopencv_superres \ -lopencv_videostab -lopencv_aruco \ -lopencv_bgsegm -lopencv_bioinspired \ -lopencv_ccalib -lopencv_dpm \ -lopencv_freetype -lopencv_fuzzy \ -lopencv_hdf -lopencv_line_descriptor \ -lopencv_optflow -lopencv_reg \ -lopencv_saliency -lopencv_stereo \ -lopencv_structured_light \ -lopencv_phase_unwrapping -lopencv_rgbd \ -lopencv_surface_matching -lopencv_tracking \ -lopencv_datasets -lopencv_text \ -lopencv_face -lopencv_plot \ -lopencv_dnn -lopencv_xfeatures2d \ -lopencv_shape -lopencv_video \ -lopencv_ximgproc -lopencv_calib3d \ -lopencv_features2d -lopencv_flann \ -lopencv_xobjdetect -lopencv_objdetect \ -lopencv_ml -lopencv_xphoto \ -lopencv_highgui -lopencv_videoio \ -lopencv_imgcodecs -lopencv_photo \ -lopencv_imgproc -lopencv_core # apparently, most of them are not needed... # In bash style, same procedure is like g++ -Wall DisplayImage.cpp `pkg-config opencv --cflags` `pkg-config opencv --libs` # Or in shorter form, g++ -Wall DisplayImage.cpp `pkg-config opencv --cflags --libs` # But you cannot run this time (error) ./a.out ./lena.jpg # because some dynamic libraries cannot be found ldd ./a.out # You youself have to tell where the OpenCV dynaic libraries are # (only once for a shell) LD_LIBRARY_PATH=/tmp/iit/usr/lib export LD_LIBRARY_PATH # and see all fine ldd ./a.out # Go! ./a.out lena.jpg |