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I figured it out,

It was an issue with the CMakeList.txt and the OpenCV libraries. I had originally had the CMakeLists.txt addtarget to specific folder inside my project which had the opencv libraries. But for whatever reason when i did an update it would no longer let me do this so i just needed to remove

${CMAKE_CURRENT_SOURCE_DIR}/lib/libopencv_core.so And all others...

and replace with

${OpenCV_LIBRARIES}

And that fixed the problem

Hi,

So I have been working with opencv and ros to do object detection and everything seemed to be fine until the other day and suddenly when i start using the SURF detection line of code I get this error.

/home/frank/catkin_ws/devel/lib/bingo_detection/bingo_detection_server: symbol lookup error: /home/frank/catkin_ws/devel/lib/bingo_detection/bingo_detection_server: undefined symbol: _ZNK2cv9Feature2D7computeERKNS_3MatERSt6vectorINS_8KeyPointESaIS5_EERS1_

I have no idea what I did.

I am currently working on a project that detects objects using a webcam. My algorithm is working well in good natural lighting conditions but when the lighting conditions change or if the light source isn't very good, the webcam seems to have difficulty setting proper exposure. I would like to be able to dynamically change the exposure so that if the image is too dark or too bright i could override the webcams exposure settings. Also I would like to look into doing something like HDR to better detect things in harsh lighting conditions. Is there a way to do that through ROS? I'm using a Logitech C90 webcam and OpenCV for my image processing.

TT