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adding a python node that uses opencv - ROS Indigo

asked 2015-04-22 16:57:40 -0500

voladoddi gravatar image

I followed this guide for setting up OpenCV for ROS Indigo (since it doesn't come bundled anymore).

Now, the problem is I don't have an executable node that is produced from a CPP source file for target_link_libraries but I have a python node that uses OpenCV.

After adding 1)

all the dependencies in "package.xml" file,

and 2)

find_package(OpenCV REQUIRED)

in the CMakeLists.txt file, I get this error:

CMake Error at HELLO_WORLD/CMakeLists.txt:168 (target_link_libraries):
  Cannot specify link libraries for target "HELLO_WORLD" which is not built
  by this project.

How do I resolve this issue? Other nodes written in Python, I can just say "rosrun [PACKAGE_NAME]" But in this Python node that uses OpenCV, I need to make changes appropriately in the CMakeLists.txt file. Only, I'm not quite sure what it is. sources I've referred to talk about CPP nodes.

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answered 2015-04-22 20:07:26 -0500

If you're only using OpenCV with python, you don't need to add anything in your CMakeLists.txt. As long as the python module is on your PYTHONPATH, you're all set.

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Thanks! Yes, I realised that "import cv2" already exists in the code. And it was pointed about by another gentleman on another post as well but this makes it clear :)

voladoddi gravatar image voladoddi  ( 2015-04-23 12:39:27 -0500 )edit

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Asked: 2015-04-22 16:57:40 -0500

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Last updated: Apr 22 '15