Opencv installation, usage with and without ROS

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Thank you for the reply. Can you pls tell me how to edit CMakeLists.txt so that ROS uses OpenCV 2.4.9

The ROS libraries and executable come already linked to a specific (and not changeable opencv library). However, for your custom code you can select the version of opencv in cmake. One thing you have todo is: FIND_PACKAGE(OpenCV 2.4.8 EXACT REQUIRED)

Additionally you have to enable cmake reach the development libraries you are going to use. It can be done in many ways, for instance you can set the OPENCV_DIR cmake variable (through the CMakeFileLists.txt or using the cmake -DOPENCV_DIR or configuring the build with ccmake)

All this is possible but you should study how Cmake works here and how the operative system works in terms of library loading and how C++ libraries are linked... otherwise you may find problems or situations that you may not understand

To make ROS work directly with one specific version you will have to compile ROS from sources or find a precompiled version (hydro, indigo, jade, etc.) that is linked with the version of opencv you want.

Thank You for the guidance. I will start developing an understanding of cmake.