fix compilation with cv_backports not present

We will still need to branch for Kinetic because of package.xml

CMakeLists.txt

@@ -1,8 +1,14 @@
 cmake_minimum_required(VERSION 2.8)
 project(ecto_opencv)
 
+find_package(cv_backports QUIET)
+if(cv_backports_FOUND)
 find_package(catkin REQUIRED ecto opencv_candidate cv_backports)
 catkin_package(DEPENDS ecto opencv_candidate cv_backports)
+else()
+find_package(catkin REQUIRED ecto opencv_candidate)
+catkin_package(DEPENDS ecto opencv_candidate)
+endif()
 
 if(NOT CMAKE_BUILD_TYPE)#Only do this the on the first run, if the build type hasn't been set prior
  set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING

cells/cv_bp/opencv/cv_highgui.cpp

@@ -6,7 +6,18 @@
 #include <iostream>
 #include <fstream>
 #include <opencv2/highgui/highgui.hpp>
+#if CV_MAJOR_VERSION == 2 && CV_MINOR_VERSION == 4 && CV_SUBMINOR_VERSION < 10
 #include <cv_backports/imshow.hpp>
+#else
+namespace cv_backports {
+ using cv::destroyWindow;
+ using cv::imshow;
+ using cv::namedWindow;
+ using cv::setWindowProperty;
+ using cv::startWindowThread;
+ using cv::waitKey;
+}
+#endif
 
 namespace bp = boost::python;