title: OpenCV compiler error when using Stitcher under iOS
body: <p>Whenever I try to use the OpenCV Stitcher class in iOS and I include the stitcher-header ( #include ) I end up with a compile error "Expected '{'" in exposure_compensate.hpp. Apparently the line
      enum { NO, GAIN, GAIN_BLOCKS };
  is causing some sort of error.</p>
  
  <p>I am very new to openCV but using other functions like filter2d() work as expected. How can I resolve this?</p>