Compatibility with OpenCV 3.x

imread has moved from highgui to the imgcodecs module in version 3.0.

examples/CMakeLists.txt

@@ -3,6 +3,10 @@ cmake_minimum_required(VERSION 2.8.10)
 
 # The examples need a few additional dependencies (e.g. boost filesystem and OpenCV highgui):
 find_package(OpenCV 2.4.3 REQUIRED core imgproc highgui)
+if("${OpenCV_VERSION_MAJOR}$" EQUAL 3)
+  message(STATUS "OpenCV 3.x detected - including imgcodecs for compatibility")
+  find_package(OpenCV 3.0.0 REQUIRED core imgproc highgui imgcodecs)
+endif()
 message(STATUS "OpenCV include dir found at ${OpenCV_INCLUDE_DIRS}")
 message(STATUS "OpenCV lib dir found at ${OpenCV_LIB_DIR}")
 # This allows us to compile in RelWithDebInfo. It'll use the Release-version of OpenCV: