Joy.Lin's profile - activity

rosrun image_view image_view image:=/usb_cam/image_raw _image_transport:=theora

I can see the image with this command. Thank you ,IvanV

Thank for your reply. I think usb_cam_node.cpp "advertiseCamera("image_raw" ,1)" ,so it publishes the topic named "image_raw". I can't image_view "/usb_cam/image"

Could I know how to modify the usb_cam package to get the compressed image? It's need to modify the .cpp file (add some command about image_transport into usb_cam_node )?Otherwise,command "rosrun image_view image_view image:=/usb_cam/image_raw _image_transport:=compressed" showed no data

Hi everyone, I have opened the webcam with usb_cam successfully, and I can see the image_raw topic running. However, I want to get the image_stream from the other computer. How could I do to subscribe the image_raw topic from the other computer'ROS with WiFi？ publisher: indigo ubuntu 14.04 subscriber: virtubox on mac ubuntu14.04.3 indigo

Thank you very much . I can play the sound file successfully!! However, I can't control its volume, it's always too low.

hi everyone. I want to play a sound file on a C++ node with sound_play. I have downloaded the audio_common package already , but I don't know how to use it to realize my purpose. Please anyone can give me a detailed tutorial . I use indigo catkin ubuntu 14.04

Hi,everyone. I try to do the image_transport tutorial link text. It catkin_make successfully ,but I can't see the webcam image from subscriber_node(it showed up the empty frame).
[use 14.04 ubuntu indigo cv_bridge is include opencv2]

this is my CMakeList:

cmake_minimum_required(VERSION 2.8.3) project(image_test) find_package(catkin REQUIRED COMPONENTS cv_bridge genmsg image_transport roscpp sensor_msgs std_msgs )

include_directories( ${catkin_INCLUDE_DIRS} )

include_directories(include ${catkin_INCLUDE_DIRS}) add_executable(my_publisher src/my_publisher.cpp) target_link_libraries(my_publisher ${catkin_LIBRARIES}) add_dependencies(my_publisher image_test_generate_messages_cpp) add_executable(my_subscriber src/my_subscriber.cpp) target_link_libraries(my_subscriber ${catkin_LIBRARIES}) add_dependencies(my_subscriber image_test_generate_messages_cpp)

Thank for your answer. I tried to exchange /dev/video0. with /dev/video1 , but it still showed me [ERROR] [1459206531.327861602]: Cannot open '/dev/video1': 11, Resource temporarily unavailable There are the other messages it showed me. I add them above.

I followed this website http://answers.ros.org/question/19765... ,try to open my webcam. There are some errors about comand

$ rosrun usb_cam usb_cam_node

It shows error message like the following.

[ INFO] [1459206531.320684602]: using default calibration URL
[ INFO] [1459206531.321520602]: camera calibration URL: file:///home/udooer/.ros/camera_info/head_camera.yaml
[ INFO] [1459206531.322092602]: Unable to open camera calibration file 
[/home/udooer/.ros/camera_info/head_camera.yaml]
[ WARN] [1459206531.322306602]: Camera calibration file /home/udooer/.ros/camera_info/head_camera.yaml not found.
[ INFO] [1459206531.322585935]: Starting 'head_camera' (/dev/video0) at 640x480 via mmap (yuyv) at 30 FPS
[ERROR] [1459206531.327861602]: Cannot open '/dev/video0': 11, Resource temporarily unavailable

I have tried to open my camera (logitech C920) with guvcview successfully. However,it still can't work on ROS .