[ros-users] ros-users Digest, Vol 16, Issue 10
Mr cnn lakshmen
cnnlakshmen_2000 at yahoo.com
Fri Jun 10 19:28:27 UTC 2011
which file is it that can i use to get the depth data?
----- Original Message ----
From: "ros-users-request at code.ros.org" <ros-users-request at code.ros.org>
To: ros-users at code.ros.org
Sent: Sat, June 11, 2011 3:00:02 AM
Subject: ros-users Digest, Vol 16, Issue 10
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Today's Topics:
1. Re: show video from robot in the web interface (based on
rosjs tutoirial) (Alexander Shavykin)
2. Re: A Python version of the ROS REIN framework? (Patrick Goebel)
3. Announcing a new ROS repository (#SOH DE LOONG#)
4. Re: ros-users Digest, Vol 16, Issue 9 (Ravi Kumar)
5. error with opencv in image_transport tutorial (Alexander Shavykin)
6. IPv6 support (Rodrigo Ventura)
----------------------------------------------------------------------
Message: 1
Date: Fri, 10 Jun 2011 01:55:15 +0400
From: Alexander Shavykin <alex at shavykin.ru>
Subject: Re: [ros-users] show video from robot in the web interface
(based on rosjs tutoirial)
To: User discussions <ros-users at code.ros.org>,
Sarah.Osentoski at us.bosch.com
Message-ID: <BANLkTimTepYDfHF+pyw+TJz9U1zbh1OHmg at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Thank you for the answer Sarah.
It works but not so as i want.
First of all i have problems with the setting params for mjpeg_server as it
has written in tutorial:
http://localhost:8080/stream?topic=/gscam/image_raw&width=320&height=240
Now i see only 640*480 picture with very big delay in local network.
Also i tried to set params in gscam (using GSCAM_CONFIG) but it didn't help
(like *GSCAM_CONFIG*="v4l2src device=/dev/video0 ! videoscale !
video/x-raw-yuv,width=320,height=240 ! ffmpegcolorspace !
video/x-raw-rgb")
And also i have some other questions
Is gscam better for publish images then another image_transport modules?
Is combination gscam and mjpeg_server is the best decision for
decrease the delays between robot and
offboard computer?
Also if you could put up a tutorial for another way to show video from
robot to web using rosjs
it will be very good.
And the last question: what is the best way to transmit audio from ROS
to offboard computer?
Thank you!
2011/6/9 Osentoski Sarah (CR/RTC1.1-NA) <Sarah.Osentoski at us.bosch.com>
> Hi Alexander,
>
>
> So, I'm a bit confused about getting the camera to publish topics to ros or
> getting those topics from ros into the website. So I'll endeavour to answer
> both.
>
> 1. How to get your camera to be publishing rostopics:
>
> The first thing to do is to make sure that you get your camera publishing
> images to ros. There are a lot of different drivers/code you can use but
> since you mentioned gstreammer I'll explain how to use gscam to get the
> images from your camera into ROS.
>
> The documentation for gscam can be found here:
> http://www.ros.org/wiki/gscam
>
> And you can download it using apt-get install
> ros-diamondback-brown-perception
>
> If your camera was attached to /dev/video2 then you coul ddo the vollowing
> commands
>
> roscd gscam
> cd bin
> export GSCAM_CONFIG="v4l2src device=/dev/video2 ! video/x-raw-rgb !
>ffmpegcolorspace"
> rosrun gscam gscam
>
> Now gscam will be publishing the images on gscam/image_raw topic
>
> 2. How to get the rostopics that your camera publishes to be viewed on the
> website:
>
> You can stream the video to the website one of two ways. The first is how
> you mentioned where you use rosjs to subscribe to the topic. If you need
> help with what to do from here we can put up a tutorial.
>
> There is another node, mjpeg_server http://www.ros.org/wiki/mjpeg_server that
> will let you stream the videos and take advantage of built in optimizations
> in the browser
>
> To use this node you can install it via the following command:
> apt-get install ros-diamondback-remote-lab
>
> then just rosrun mjpeg_server mjpeg_server
>
> To see the image you can just type the address into your web browser:
>
>
> http://localhost:8080/stream?topic=/gscam/image_raw
>
>
> You should see the image in your browser at this point. The documentation
> on the mjpeg_server page will tell you parameters you can set to see the
> images at different quality/sizes.
>
> I hope this helps. Let us know if you have any questions.
>
> Sarah Osentoski
>
> ------------------------------
> *From:* ros-users-bounces at code.ros.org [mailto:
> ros-users-bounces at code.ros.org] *On Behalf Of *Alexander Shavykin
> *Sent:* Wednesday, June 08, 2011 1:43 PM
> *To:* ros-users at code.ros.org
> *Subject:* [ros-users] show video from robot in the web interface (based
> on rosjs tutoirial)
>
> Hello.
>
> I have an Irobot Create and netbook with web camera on it.
> The system on netbook is Ubuntu 10.04
> I try to make control the robot with ROS via web interface from offboard
> computer using wi-fi.
> So there is very good tutorial with rosjs.
>
> All examples work.
> But i am a little confused how to show video from web camera on the robot
> in my web interface.
>
> So as i understand there are some methods for this task
>
> To use service /imagetopic
>connection.callService('/rosjs/subscribe',json(['/imagetopic',0,'jpeg',128,96,100]),function(rsp)
>)
> {});
> or
> to use gstreamer
> and also others.
> I don't understand how to realize these methods.
> Could you give some examples how to show the video from the robot in the
> web interface on off board computer?
>
>
> Thank you.
>
>
> _______________________________________________
> ros-users mailing list
> ros-users at code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>
>
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Message: 2
Date: Thu, 09 Jun 2011 15:24:28 -0700
From: Patrick Goebel <patrick at pirobot.org>
Subject: Re: [ros-users] A Python version of the ROS REIN framework?
To: ros-users at code.ros.org
Message-ID: <4DF1481C.1040506 at pirobot.org>
Content-Type: text/plain; charset=ISO-8859-1
So I already have a followup to my own question. I have a detector node
that does the face detection and publishes the results using the rein
DetectionArray message type which includes an ROI for each detected
face. I have a separate display node that displays the raw camera image
as well as any markers that might be generated by the detector (or other
nodes) such as bounding boxes around faces.
My question is this: is it better ROS practice to have the display node
subscribe to the DetectionArray topics from each of the detector node(s)
and then draw bounding boxes (or other markers) from the those messages,
or, should I create services in the display node that draw markers on
the image upon requests from the detector nodes? I rather like the feel
of the services approach, but since frame rates will be about 20-30 fps,
is this considered on the high side for service-based transactions?
Thanks!
patrick
On 6/9/2011 11:47 AM, Patrick Goebel wrote:
> Hello ROS users,
>
> I was reading up on the ROS REIN framework
> (http://www.ros.org/wiki/rein) which looks really nice and I want to do
> something similar using Python. I have a good start and will use my
> pi_face_tracker application as a test case. But before I get too far
> along, has anyone already done this? In other words, has anyone already
> put together a Python-based image processing pipeline for ROS/OpenCV and
> optionally, point clouds as well? (Though I realize that PCL does not
> yet have Python bindings.)
>
> Thanks!
> patrick
>
> http://www.pirobot.org
>
>
> _______________________________________________
> ros-users mailing list
> ros-users at code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>
------------------------------
Message: 3
Date: Fri, 10 Jun 2011 02:36:08 +0000
From: #SOH DE LOONG# <SOHD0001 at e.ntu.edu.sg>
Subject: [ros-users] Announcing a new ROS repository
To: "ros-users at code.ros.org" <ros-users at code.ros.org>
Message-ID:
<867E641DAC9AA74FB1FD0E4651A676302A3B81CF at SINPRD0103MB043.apcprd01.prod.exchangelabs.com>
Content-Type: text/plain; charset="us-ascii"
Hi everybody,
A*STAR wants to announce our new ros repository:
http://code.google.com/p/astar-ros-pkg/
For now, the repository contains only one package
but more will be added when they are ready.The
package in the repository does a simple people detection
and tracking using the Kinect. It also outputs the position
and distance of each person from the kinect's point of
view.
Thanks for your attention.
------------------------------
Message: 4
Date: Fri, 10 Jun 2011 11:04:28 +0530
From: Ravi Kumar <ravikumar.iitp at gmail.com>
Subject: Re: [ros-users] ros-users Digest, Vol 16, Issue 9
To: ros-users at code.ros.org
Message-ID: <BANLkTi=8-qydmbHj5egJo0KdUMOZa7pErQ at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi all,
I need 2d laser data of horizontal terrain, but I am unable in getting that,
so I am using data from (mrpt.org), rawlog format but can any please tell me
how to convert the rawlog file in to bag or input data.
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Message: 5
Date: Fri, 10 Jun 2011 15:28:57 +0400
From: Alexander Shavykin <alex at shavykin.ru>
Subject: [ros-users] error with opencv in image_transport tutorial
To: ros-users at code.ros.org
Message-ID: <BANLkTi=u8MnwpkQyKZwXjs6_2TnahADFjg at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hello.
i have an Ubuntu 10.04 and Ros diamondback.
I try to do image_transport tutorial (
http://www.ros.org/wiki/image_transport/Tutorials)
i run (as here
http://www.ros.org/wiki/image_transport/Tutorials/ExaminingImagePublisherSubscriber
)
-------------------------------------------------------------------------------------------
alexander at alexander-laptop:~/learning_image_transport$ rosrun
learning_image_transport my_publisher home/alexander/image.jpg
---------------------------------------------------------------------------------------------
And i got next error:
-----------------------------------------------------
OpenCV Error: Null pointer (NULL array pointer is passed) in cvGetMat, file
/tmp/buildd/ros-diamondback-vision-opencv-1.4.3/debian/ros-diamondback-vision-opencv/opt/ros/diamondback/stacks/vision_opencv/opencv2/build/opencv-svn/modules/core/src/array.cpp,
line 2380
terminate called after throwing an instance of 'cv::Exception'
what():
/tmp/buildd/ros-diamondback-vision-opencv-1.4.3/debian/ros-diamondback-vision-opencv/opt/ros/diamondback/stacks/vision_opencv/opencv2/build/opencv-svn/modules/core/src/array.cpp:2380:
error: (-27) NULL array pointer is passed in function cvGetMat
Aborted
--------------------------------------------------------------------------
How can i correct this situation?
Thank you
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Message: 6
Date: Fri, 10 Jun 2011 19:54:40 +0100
From: Rodrigo Ventura <yoda at isr.ist.utl.pt>
Subject: [ros-users] IPv6 support
To: ros-users at code.ros.org
Message-ID: <34D4C2AD-87F0-402A-A6D1-65F43D0A1B38 at isr.ist.utl.pt>
Content-Type: text/plain; charset=iso-8859-1
It seems ROS does not support IPv6, yet.
Is there any plans to add IPv6 support? How hard would it be?
Best,
Rodrigo Ventura
Institute for Systems and Robotics
Instituto Superior T?cnico
Lisbon, Portugal
http://users.isr.ist.utl.pt/~yoda
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