remove cv_bridge and downstream as they dont compile

[mikaelarguedas]

Follow-up of #257

Remove cv_bridge, opencv_tests and vision_opencv as they currently fail to build.

@gaoethan FYI

[gaoethan]

Sorry, a little confused, I can't reproduce the issue of "opencv not found" within my environment, so I'd like to check what the version of the opencv is installed in yours ? thanks !

[mikaelarguedas]

cv_bridge uses OpenCV but doesn't have a dependency on opencv in it's package.xml. So the package cannot be built as it fails to find_package(OpenCV) at https://github.com/ros-perception/vision_opencv/blob/4c6b4c0c6c00b4c47f493e49e2e0c5d0c32d937d/cv_bridge/CMakeLists.txt#L27.

You can reproduce it by doing the following:

$ docker run -it --rm ubuntu:bionic
apt update && apt upgrade -y && apt install -y dirmngr lsb-release gnupg2
history
apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
echo "deb [arch=amd64,arm64] http://repo.ros2.org/ubuntu/testing `lsb_release -cs` main" > /etc/apt/sources.list.d/ros2-latest.list
apt update
apt install -y git python3-rosdep python3-colcon-common-extensions
mkdir -p ~/vision_opencv_ws/src && cd ~/vision_opencv_ws/src
git clone https://github.com/ros2-gbp/vision_opencv-release -b debian/bouncy/bionic/cv_bridge
ls
cd ..
export ROSDISTRO_INDEX_URL='https://raw.githubusercontent.com/ros2/rosdistro/ros2/index.yaml'
rosdep init && rosdep update
rosdep install --from-paths src --ignore-src --rosdistro bouncy -y
source /opt/ros/bouncy/setup.bash 
colcon build

[gaoethan]

okay, thanks, there is a follow-up PR ros-perception/vision_opencv#240 verified to address it.