I need to use OpenCV dnn for a ROS node. Since the default OpenCV version that comes with kinetic does not have support for all the functionality that I need, I installed OpenCV4. Then I did the following in the CMake to get it to work.

set(OpenCV_DIR "/usr/local/lib/")
FIND_PACKAGE(OpenCV 4 REQUIRED)

This works fine. Problem arises when I try to use some image related packages (which might be trying to use the ROS OpenCV).

In my node, next I need some image_geometry functionalities. But when I put image_geometry in the find_package, it starts to give me compile errors starting from the message error: ‘dnn’ in namespace ‘cv’ does not name a type. These are the same compile errors I get if I use the cv_bridge instead of OpenCV4.

Does anybody have a workaround for this? Some way to point image_geometry (or any other ROS package using OpenCV) to an OpenCV version other than the ROS OpenCV version.