cduguet's profile - activity

I am using Kinect on Ubuntu 16.04.

After executing

rosrun image_view extract_images image_transport/compressed_sub

I get

terminate called after throwing an instance of 'image_transport::TransportLoadException'
what():  Unable to load plugin for transport 'image_transport/compressed_sub', error string:
According to the loaded plugin descriptions the class image_transport/image_transport/compressed_sub_sub with base class type image_transport::SubscriberPlugin does not exist. Declared types are  image_transport/compressedDepth_sub image_transport/compressed_sub image_transport/raw_sub image_transport/theora_sub
Aborted (core dumped)

What surprises me is the name of the class, which seems to me a little redundant. image_transport/image_transport/compressed_sub_sub instead of image_transport/compressed_sub

Is this maybe be a bug?

EDIT: I do have compressed_image_transport installed

Unable to load plugin for transport 'image_transport/compressed_sub' I am using Kinect on Ubuntu 16.04. After executin

Unable to load plugin for transport 'image_transport/compressed_sub' I am using Kinect on Ubuntu 16.04. After executin

Hi, it seems like i do not totally understand rosdep2. I could easily add my own system dependencies in rosdep. in the sources.list file I tried to add local yaml file addresses as:

yaml /opt/ros/fuerte/share/ros/opencv.yaml

in order to use my own built opencv-svn (Opencv2.4) package, but it rejects it because:

url must be a fully-specified URL with scheme, hostname, and path

How can I add system dependencies to rosdep2?

Hi,

I am sorry if I am not using the proper words when I refer to "run a callback function" from a subscriber while using rospy. I'm not sure I got the concept of keeping the nodes sleeping. However, this is not my question.

I want to make a logger node node which takes data from the first message received in a topic, and writes it as a header in a file. Then it will be storing the raw data as long as rospy.spin() says so. The problem is, I have not found an example of how to do this, or if there is such a function. All I can think about are pretty cluttered solutions, which take the time stamp and compares them in every message.

my question is, is there a way to call

rospy.Subscriber("Flow", OpticalFlow2D.msg.FrameFlow, callbackOF)

many times and

rospy.Subscriber("Flow", OpticalFlow2D.msg.FrameFlow, callbackOFonce)

just on the first time, to write the header?

Many thanks,

Cristian

Hi! I am using rosbag play in a launch file, and one of the recorded topics is processed data from the other topics. As I want to produce again, I would like to play all topics except that one.

I know I should have given it an anonymous name or I can play it in a namespace. But I would like just not to have that topic playing.

Thanks!

Cristian

Hi,

I have extracted an Image message using cv_bridge as this:

cv_bridge::CvImagePtr cv_ptr;
cv_ptr = cv_bridge::toCvCopy(msg, enc::MONO8);

and i could convert it to an IplImage using:

IplImage *image2 = NULL;
allocateit( &image2, frame_size, IPL_DEPTH_8U, 1 );
image2->imageData = (char *) cv_ptr->image.data;

where allocateit is a function to allocate space. My problem comes when I want to read a color image as this:

cv_bridge::CvImagePtr cv_ptr;
cv_ptr = cv_bridge::toCvCopy(msg, enc::BGR8);
IplImage *image2 = NULL;
allocateit( &image2, frame_size, IPL_DEPTH_8U, 1 );

and want to copy one channel of *cv_ptr to the image to the IplImage *image2. I have tried:

image2->imageData = (char *) cv_ptr->image.data;

but it crashes,

cv::cvtColor(cv_ptr->image.data,image2->imageData,CV_RGB2GRAY);

but does not compile,

int from_to[] = {0,0};
cv::mixChannels(&(cv_ptr->image.data),1,image2,1, from_to,1);

does not compile either.

What would you recommend me to do? Thanks!

Hello,

Some script which was working before, now does not work anymore. The issue is that the param instruction in the launch file, does not seem to have any effect in the executable file

<param name="camera_topic" value="/camera/image_rect"  type="str"/>

in my C++ executable, I looked for this "camera_topic" relative parameter as:

ros::param::get("camera_topic",camera_topic);

but I cannot get them easily. setting the same parameter in the program before getting it works, so I conclude it must be something about the launch file. The funny thing is that it worked before (+2 months).

hi,

I have not idea what have happened, but trying to solve another problem (out of the scope of this question, but related to that cvOpticalFlowPyrLK could not be found on cv::) suddenly, when compiling i find this problem :

Linking CXX executable bin/Optical_Flow
/usr/bin/cmake -E cmake_link_script CMakeFiles/Optical_Flow.dir/link.txt --verbose=1
/usr/bin/c++   -O2 -g    -Wl,-rpath,/opt/ros/fuerte/stacks/vision_opencv/cv_bridge/lib -Wl,-rpath,/opt/ros/fuerte/stacks/image_common/image_transport/lib -Wl,-rpath,/opt/ros/fuerte/stacks/pluginlib/lib -Wl,-rpath,/opt/ros/fuerte/stacks/image_common/camera_info_manager/lib -Wl,-rpath,/opt/ros/fuerte/stacks/image_common/camera_calibration_parsers/lib -Wl,-rpath,/opt/ros/fuerte/stacks/geometry/tf/lib -Wl,-rpath,/opt/ros/fuerte/stacks/bullet/lib -pthread CMakeFiles/Optical_Flow.dir/src/Optical_Flow.o  -o bin/Optical_Flow -rdynamic -L/opt/ros/fuerte/lib -L/opt/ros/fuerte/stacks/vision_opencv/cv_bridge/lib -L/opt/ros/fuerte/stacks/image_common/image_transport/lib -L/opt/ros/fuerte/stacks/pluginlib/lib -L/opt/ros/fuerte/stacks/image_common/camera_info_manager/lib -L/opt/ros/fuerte/stacks/image_common/camera_calibration_parsers/lib -L/opt/ros/fuerte/stacks/geometry/tf/lib -L/opt/ros/fuerte/stacks/bullet/lib -lopencv_calib3d -lopencv_contrib -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_gpu -lopencv_highgui -lopencv_imgproc -lopencv_legacy -lopencv_ml -lopencv_nonfree -lopencv_objdetect -lopencv_photo -lopencv_stitching -lopencv_ts -lopencv_video -lopencv_videostab -lcv_bridge -lsensor_msgs -limage_transport -lpoco_lite -lboost_fs_wrapper -ltinyxml -lroslib -lmessage_filters -lroscpp -lrostime -lrosconsole -lroscpp_serialization -lxmlrpcpp -lcamera_info_manager -lcamera_calibration_parsers -ltf -lboost_thread-mt -lBulletDynamics -lBulletCollision -lLinearMath -Wl,-rpath,/opt/ros/fuerte/lib:/opt/ros/fuerte/stacks/vision_opencv/cv_bridge/lib:/opt/ros/fuerte/stacks/image_common/image_transport/lib:/opt/ros/fuerte/stacks/pluginlib/lib:/opt/ros/fuerte/stacks/image_common/camera_info_manager/lib:/opt/ros/fuerte/stacks/image_common/camera_calibration_parsers/lib:/opt/ros/fuerte/stacks/geometry/tf/lib:/opt/ros/fuerte/stacks/bullet/lib 
/usr/bin/ld: cannot find -lsensor_msgs
make[2]: Leaving directory `/home/dlr/ros_workspace/OpticalFlow'
collect2: ld returned 1 exit status
make[1]: Leaving directory `/home/dlr/ros_workspace/OpticalFlow'
make[2]: *** [bin/Optical_Flow] Error 1
make[1]: *** [CMakeFiles/Optical_Flow.dir/all] Error 2
make: *** [all] Error 2

I have no idea what could have happened, since it was compiling before with the exact same code. The only thing that comes to my mind it could have bee, is that I reinstalled the repos packages ros-fuerte-* . Still, my previously installed ROS is also the repos one, and I was using it almost out of the box.

In .bashrc I have:

source /opt/ros/fuerte/setup.bash
source /home/dlr/ros_workspace/setup.bash
export ROS_PACKAGE_PATH=~/ros_workspace:/opt/ros/fuerte/stacks:/opt/ros/fuerte/share:/opt/ros/fuerte/share/ros
export ROS_WORKSPACE=~/ros_workspace
export EDITOR='gedit'

in my manifest I have :

  <depend package="sensor_msgs"/>

But in /opt/ros/fuerte/lib:

$ ls *sensor*
ls: cannot access *sensor*: No such file or directory

Can somebody give me hints how to track this problem?? Thank you