catkin returns array of functions in opencv

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I am trying to do wiki.ros.org/cv_bridge/Tutorials/UsingCvBridgeToConvertBetweenROSImagesAndOpenCVImages

But I get this error:

Linking CXX executable image_converter CMakeFiles/image_converter.dir/src/image_converter.cpp.o: In function main': image_converter.cpp:(.text+0x50): undefined reference to ros::init(int&, char**, std::basic_string<char, std::char_traits<char="">, std::allocator<char> > const&, unsigned int)'

and so on

My CmakeLists.txt

cmake_minimum_required(VERSION 2.8.3) project(learning_image_transport)

find_package(OpenCV)
include_directories(${OpenCV_INCLUDE_DIRS})

add_executable(image_converter src/image_converter.cpp)
target_link_libraries(image_converter ${OpenCV_LIBRARIES})

find_package(catkin REQUIRED COMPONENTS genmsg cv_bridge
image_transport roscpp std_msgs )

And Package.xml

<buildtool_depend>catkin</buildtool_depend> <buildtool_depend>genmsg</buildtool_depend> <build_depend>image_transport</build_depend> <build_depend>roscpp</build_depend>
<build_depend>std_msgs</build_depend> <build_depend>cv_bridge</build_depend> <build_depend>opencv2</build_depend>
<run_depend>opencv2</run_depend>
<run_depend>cv_bridge</run_depend>
<run_depend>image_transport</run_depend> <run_depend>roscpp</run_depend>
<run_depend>std_msgs</run_depend>