All Questions
Tagged with opencv image-transport
12 questions
0
votes
1
answer
82
views
Compress Image topic with h264 streaming for low bandwidth connection?
Hello,
I faced the problem that sending the video with big resolution (1920x1080) is very difficult even with image transport. The raw or compressed images are too bit for sending over the network (...
Yehor
0
votes
1
answer
9
views
Transport Image tutorial issue: subscriber doesn't show image
Hello everyone,
I tried to do the tutorial " Running the Simple Image Publisher and Subscriber with Different Transports " image_transport/Tutorials
but I encountered an issue.
When I run ...
Hysis
0
votes
1
answer
5
views
Why prefer to use uvc_camera instead of cv::Capture when working with OpenCV?
Hi!
ROS offers its own way of grabbing data from cameras (for example: a normal web cam most of us have integrated in our notebooks) using the uvc_camera driver. Now I'm not asking why use this at all....
rbaleksandar
0
votes
1
answer
3
views
Black image for an Image publisher with image_transport
I made a node retrieving an image with openCV explained on this ROS tutorial. The image is ten converted into a format suitable for ROS, using CV_bridge functions.
Problem is, there is no image that ...
Alexandre.Willame
0
votes
1
answer
56
views
Is there any point in using image_transport republish instead of using CompressedImage in Python?
I have a Python ROS node that subscribes to a topic of message type CompressedImage. So far it works fine (I play a rosbag with compressed images, run my node, and it correctly reads them [I checked ...
basheersubei
0
votes
1
answer
8
views
build errors when trying to use CVbridge with ROS Hydro
I'm trying to follow this tutorial - http://wiki.ros.org/cv_bridge/Tutorials/UsingCvBridgeToConvertBetweenROSImagesAndOpenCVImages
to stream images to a node.
After I added the node ...
voladoddi
0
votes
2
answers
10
views
using image transport compression and boost library c++
Hi, I have a callback that I need to run after subscribing to a ROS image topic:
...
rosmat88
0
votes
1
answer
10
views
Problem with converting image from depth to grayscale
I am trying to convert depth image from (/camera/depth/image) to grayscale image (/camera/rgb/image_mono). This is my code.
...
prasanna.kumar
0
votes
1
answer
2
views
Trouble with compressed image transport and ardrone_autonomy
I recorded some .bag files from a few runs with the ardrone_autonomy node. I was recording the compressed image topic, and I can successfully play it back using image_view.
However, I tried putting ...
- 5,747
0
votes
1
answer
4
views
opencv undefined reference problem
I am trying to build learning_image_transport from image_transport tutorial on Gumstix Overo which has ros groovy running on linaro.
However, one of dependencies of learning_image_transport -- opencv2 ...
AdrianPeng
0
votes
1
answer
4
views
"Illegal Instruction" when using "image_view" with theora
Hi,
I'm using latest ROS electric with Ubuntu 10.10 (kernel 2.6.35-27-generic).
When running:
...
Filipe Jesus
0
votes
1
answer
66
views
YUYV/YUV422 in image_transport
Most of USB webcams used in hobby robotics support YUYV coding natively. Currently both OpenCV and ROS by default convert this image to BGR format and this is not most efficient decicion for most ...
Tõnu Samuel