[ros-users] cv_bridge tutorial

[Eric Perko]

On Wed, Dec 29, 2010 at 1:39 AM, Homer Manalo
<homer.manalo at roboteknik.com>wrote:

> I've got it working now by replacing the "image_topic" with
> "/gscam/image_raw" in this line:
>
> image_sub_ = it_.subscribe("/gscam/image_raw", 1,
> &ImageConverter::imageCallback, this);
>
> Still, I want to know how to make it work without this modification.


Are you familiar with topic remapping (
http://www.ros.org/wiki/Remapping%20Arguments)? It would allow you to run
your converter node (without the above change) like so:

rosrun image_converter_pkg_name image_converter
image_topic:=/gscam/image_raw

You would obviously need to use the correct package and executable names,
but the bit following the executable name is the topic remapping magic.

On a separate note, did you go through all of the ROS tutorials at
http://www.ros.org/wiki/ROS/Tutorials/ ? I would expect remapping to be
introduced somewhere in them.

- Eric


>
> On Wed, Dec 29, 2010 at 11:56 AM, Homer Manalo <
> homer.manalo at roboteknik.com> wrote:
>
>> Is there a comprehensive guide on this? I am not sure what those "make
>> sure" mean. Am I suppose to get a warning message for these? I've attached
>> the rxgraph see if it helps.
>>
>>
>> On Thu, Dec 23, 2010 at 8:28 AM, Tully Foote <tfoote at willowgarage.com>wrote:
>>
>>> Have you been through the network troubleshooting page?
>>> http://www.ros.org/wiki/ROS/Troubleshooting#Network_Configuration
>>>
>>> Tully
>>>
>>>
>>> On Tue, Dec 21, 2010 at 1:58 AM, Homer Manalo <
>>> homer.manalo at roboteknik.com> wrote:
>>>
>>>> Yes I can see it. I'm actually using this line:
>>>> rosrun image_view image_view image:=/gscam/image_raw
>>>>
>>>> It's like there is no communication between the camera and the
>>>> image_converter.
>>>>
>>>> Here are some rostopic outputs:
>>>> Published topics:
>>>>  * /gscam/camera_info [sensor_msgs/CameraInfo] 1 publisher
>>>>  * /gscam/image_raw [sensor_msgs/Image] 1 publisher
>>>>  * /rosout [roslib/Log] 3 publishers
>>>>  * /rosout_agg [roslib/Log] 1 publisher
>>>>  * /image_topic_2 [sensor_msgs/Image] 1 publisher
>>>>
>>>> Subscribed topics:
>>>>  * /image_topic [sensor_msgs/Image] 1 subscriber
>>>>  * /gscam/image_raw [sensor_msgs/Image] 1 subscriber
>>>>  * /rosout [roslib/Log] 1 subscriber
>>>> homermanalo at Macmini-Linux:~/ros/stacks/pkg_test0$ rostopic info
>>>> /image_topic_2
>>>> Type: sensor_msgs/Image
>>>>
>>>> Publishers:
>>>>  * /image_converter (http://Macmini-Linux:36632/)
>>>>
>>>> Subscribers: None
>>>>
>>>>
>>>> homermanalo at Macmini-Linux:~/ros/stacks/pkg_test0$ rostopic info
>>>> /image_topic
>>>> Type: sensor_msgs/Image
>>>>
>>>> Publishers: None
>>>>
>>>> Subscribers:
>>>>  * /image_converter (http://Macmini-Linux:36632/)
>>>>
>>>>
>>>> homermanalo at Macmini-Linux:~/ros/stacks/pkg_test0$ rostopic info
>>>> /gscam/image_rawType: sensor_msgs/Image
>>>>
>>>> Publishers:
>>>>  * /gscam_publisher (http://Macmini-Linux:60675/)
>>>>
>>>> Subscribers:
>>>>  * /image_view_1292924423744539054 (http://Macmini-Linux:51945/)
>>>>
>>>> thanks
>>>>
>>>>
>>>> On Tue, Dec 21, 2010 at 5:26 PM, Billy Okal <
>>>> b.okal at jacobs-university.de> wrote:
>>>>
>>>>> Hi Manalo,
>>>>>
>>>>> you can see the mages using image_view
>>>>>
>>>>> image_view image:=<image topic> [image transport type]
>>>>>
>>>>> More info here
>>>>>
>>>>> http://www.ros.org/wiki/image_view
>>>>>
>>>>> billy
>>>>>
>>>>>
>>>>> On 21 December 2010 08:32, Homer Manalo <homer.manalo at roboteknik.com>wrote:
>>>>>
>>>>>> I want to start opencv with this tutorial<http://www.ros.org/wiki/cv_bridge/Tutorials/UsingCvBridgeToConvertBetweenROSImagesAndOpenCVImages>but it doesn't work for me.
>>>>>>
>>>>>> I created a new package then added the cpp file to the src folder then
>>>>>> added this line: rosbuild_add_executable(pkg_test0_imgToCv
>>>>>> src/pkg_test0_imgToCv.cpp) to the CMakeLists.txt file. I already added the
>>>>>> dependencies to the manifest file. Then make.
>>>>>>
>>>>>> When I run it nothing happens, I expect the highgui would appear. I
>>>>>> can confirm that my camera(gscam) is streaming images. I can see that the
>>>>>> topics listed are active but using echo on the image_topic and image_topic_2
>>>>>> prints out nothing. Using rxgraph, there are only the gstreamer_publisher
>>>>>> node and image_converter node connected to rosout node. Did I miss
>>>>>> something? How do I get this thing to work?
>>>>>>
>>>>>> thanks
>>>>>>
>>>>>> _______________________________________________
>>>>>> ros-users mailing list
>>>>>> ros-users at code.ros.org
>>>>>> https://code.ros.org/mailman/listinfo/ros-users
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Billy Okal
>>>>> Jacobs University Bremen
>>>>>
>>>>> ----------------------------------------------------------------------------------------------------------------------
>>>>> "Science without Religion is Lame and Religion without Science is
>>>>> Blind", Albert Einstein
>>>>>
>>>>> _______________________________________________
>>>>> ros-users mailing list
>>>>> ros-users at code.ros.org
>>>>> https://code.ros.org/mailman/listinfo/ros-users
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> ros-users mailing list
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>>>>
>>>>
>>>
>>>
>>> --
>>> Tully Foote
>>> Systems Engineer
>>> Willow Garage, Inc.
>>> tfoote at willowgarage.com
>>> (650) 475-2827
>>>
>>> _______________________________________________
>>> ros-users mailing list
>>> ros-users at code.ros.org
>>> https://code.ros.org/mailman/listinfo/ros-users
>>>
>>>
>>
>
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