Not sure how to add opencv library to CMakeLists.txt - c++

Question

I hope someone can help me.
I have a simple CMakeLists.txt in order to build my project on Ubuntu. I'm using CMake 2.8.1 and at the moment this is the code:
cmake_minimum_required(VERSION 2.4.6)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} /home/user/workspace)
include($ENV{ROS_ROOT}/core/rosbuild/rosbuild.cmake)
# Set the build type. Options are:
# Coverage : w/ debug symbols, w/o optimization, w/ code-coverage
# Debug : w/ debug symbols, w/o optimization
# Release : w/o debug symbols, w/ optimization
# RelWithDebInfo : w/ debug symbols, w/ optimization
# MinSizeRel : w/o debug symbols, w/ optimization, stripped binaries
#set(ROS_BUILD_TYPE RelWithDebInfo)
rosbuild_init()
find_package(OpenCV 2)
#set the default path for built executables to the "bin" directory
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)
#set the default path for built libraries to the "lib" directory
set(LIBRARY_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/lib)
#uncomment if you have defined messages
#rosbuild_genmsg()
#uncomment if you have defined services
#rosbuild_gensrv()
#common commands for building c++ executables and libraries
#rosbuild_add_library(${PROJECT_NAME} src/example.cpp)
#target_link_libraries(${PROJECT_NAME} another_library)
#rosbuild_add_boost_directories()
#rosbuild_link_boost(${PROJECT_NAME} thread)
#rosbuild_add_executable(example examples/example.cpp)
#target_link_libraries(example ${PROJECT_NAME})
include_directories(${CMAKE_SOURCE_DIR}/include
${OpenCV_INCLUDE_DIRS})
rosbuild_add_executable (RosPub src/paste.cpp)
target_link_libraries (RosPub openni_driver usb-1.0 ${OpenCV_LIBS})
I need to add opencv libraries on my project. I have added them but i can't still get my code to work. its keeps posting me this error:
‘struct MyOpenNIExample::ImgContext’ has no member named ‘image’
there is a few of them.
after i added find_package(OpenCV REQUIRED to the CMakeLists.txt,
i get this error
Adjust CMAKE_MODULE_PATH to find FindOpenCV.cmake or set OpenCV_DIR to the
directory containing a CMake configuration file for OpenCV. The file will
have one of the following names:
OpenCVConfig.cmake
opencv-config.cmake
what shld i do? I am using Apple and using Ubuntu 10.04.
Since i need
#include "opencv2\opencv.hpp"
#include "opencv2\highgui\highgui.hpp"
#include "opencv2\imgproc\imgproc.hpp"
i added
find_package(OpenCV 2),
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} /home/user/workspace) and
include_directories(${CMAKE_SOURCE_DIR}/include
${OpenCV_INCLUDE_DIRS})
target_link_libraries (RosPub openni_driver usb-1.0 ${OpenCV_LIBS})

Answer 1

#include "opencv2\opencv.hpp"
#include "opencv2\highgui\highgui.hpp"
#include "opencv2\imgproc\imgproc.hpp"
the include files above are included in the vision_opencv in ROS. so to include it, add the opencv dependency in the manifest file.
That would help.

Answer 2

Get FindOpenCV.cmake from above link and put it anywhere on your computer.
After cmake_minimum_required add line set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} [path to folder where you put FindOpenCV.cmake])
Add find_package(OpenCV) to your CMakeLists.txt
On this step you can check for OpenCV_FOUND and other OpenCV variables in your CMakeLists.txt