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2019-03-23 17:30:57 -0600 commented question segmentation fault on starting uwsim

Hi, I also found warning on possible conflict between boost.1.58 or boost.1.66. Any suggestion which version should I k

2019-03-23 12:35:29 -0600 commented question Unable to locate package ros-kinetic-osg-interactive-markers

It is odd that ros-latest.list shows trusty while I have ubuntu 16.04 xenial. Reinstall ros-kinetic on xenial solved th

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2019-03-21 18:17:01 -0600 asked a question Unable to locate package ros-kinetic-osg-interactive-markers

Unable to locate package ros-kinetic-osg-interactive-markers I am trying to install uwsim with ROS Kinetic, which requir

2019-03-21 18:14:18 -0600 asked a question Unable to locate ros-kinetic-osg-interactive-markers

Unable to locate ros-kinetic-osg-interactive-markers I am trying to install uwsim with ROS Kinetic, which requires ros-k

2017-08-02 17:27:36 -0600 asked a question rgbdslam v2 crashed with SIGSEGV in a g2o function

rgbdslam v2 crashed with SIGSEGV in a g2o function I have installed and built rgbdslam v2 with ROS Kinetic on Unbuntu 16

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2013-08-05 04:51:13 -0600 commented question Getting failed to open device error for swissranger even after udev rules change

Can you be more specific on "god' rights? I added myself to usb group, it didn't work without doing "sudo chmod -R a+rwx /dev/bus/usb" whenever SR-3000 was powered on or a USB cable was reconnected", Then I added myself to root group, and it didn't work, either. Thanks,

2013-08-02 08:24:00 -0600 commented question Getting failed to open device error for swissranger even after udev rules change

Did you finally solve the problem? I ran into similar problems as you had. Udev rules(46-mesa.rules) were set as recommended. Added my self to usb group. Got the error "Exception thrown while connecting to the camera: [SR::open]: Failed to open device!". Did "sudo chmod -R a+rwx /dev/bus/usb" as suggested by rasmusan, then everything seemed to be ok as long as SR-3000 was on and the USB cable was connected. However, if SR-3000 was powered off then powered on or the USB cable was disconnected then reconnected, then the error appeared, and "sudo chmod -R a+rwx /dev/bus/usb" was needed to get things going. I am wondering if there is any permanent solution to fix the permission issue. Thanks, CC

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2013-08-01 04:32:07 -0600 commented answer Getting failed to open device error for swissranger even after udev rules change

I got the same error, and the error was "temporarily" fixed by adding sudo chmod -R a+rwx /dev/bus/usb as suggested. However, I need to do it every time SR-3000 is turned back on or the USB cable is re-plugged in. Is there a permanent fix? I am running Ubuntu 12.04 + ROS fuerte on a 32-bit PC. Thanks, CC

2013-07-30 13:01:43 -0600 commented question sync problem on image and camera_info over wireless

Resolution 640 by 480 at 15fps. Thanks for the suggestion. CC

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2013-07-30 12:36:05 -0600 answered a question sync problem on image and camera_info over wireless

Hi,

Thanks for sharing your experience. I used CameraSubscriber to subscribe both raw_image and camera_info. CameraSubscriber uses MessageFilters and TimeSynchronizer (according to http://www.ros.org/wiki/message_filters) and has been designed for synchronizing raw_image and camera_info.

message_filters::Subscriber<image> image_sub(nh, "image", 1); message_filters::Subscriber<camerainfo> info_sub(nh, "camera_info", 1); TimeSynchronizer<image, camerainfo=""> sync(image_sub, info_sub, 10); sync.registerCallback(boost::bind(&callback, _1, _2)); I guess I could used code segment above directly with the ability to adjust synchronization parameters. What sychronization policy did you use?

I also checked the code in pgr_camera_driver. It used CameraPublisher to "simultanously" publish both topics. When using wired connection, both topics subscribed by my program show the same time-stamp. So the problem doesn't seem to be on publisher side.

Thanks,

CC

2013-07-30 06:00:50 -0600 asked a question sync problem on image and camera_info over wireless

I was running pgr_camera_driver (with a PointGrey Flea3 GigE camera) that published both color image and camera_info with the same timestamp in tandam over wireless network. Color image and camera_info were subscribed by another program using image_transport::CameraSubscriber. I got error on synchronization between images and camera_info, and images were not received by the subscriber. The problem went away when the camera was connected through a wired connection. Does anyone experience the same problem? Any suggestion to make pgr_camera_driver work over wireless will be appreciated.

Thanks, CC

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2013-06-10 09:54:13 -0600 commented question message class pcl/ModelCoefficients not built, which PCL?

I was not working on my own code, not pcl tutorial. I did make it work by adding rosbuild_genmsg() into CMakeList.txt that may cause the message class to be built. My take is that each message class only needs to be built once. Try it out to see if it helps.

2013-06-07 04:17:01 -0600 answered a question message class pcl/ModelCoefficients not built, which PCL?

Hi, Felix:

I ran into the same problem with message class for [pcl/ModelCoefficients]

ERROR: Cannot load message class for [pcl/ModelCoefficients]. Are your messages built?

Have you found the solution or walk-around?

Thanks,

CC

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2012-12-18 12:43:58 -0600 asked a question pgr_camera_driver not workin in ubuntu 12.04

Hi,

I have been trying to use pgr_camera_driver (from CCNY) to get image stream from a PGR Fleas3 Gige camera. It works just find in Ubuntu 11.10. However, when I tried it in Ubuntu 12.04, image streaming stopped after a few tens of images were received and published. Does anybody have similar problems or know what is the cause of the problem. I am using ROS Fuerte and Ubuntu 12.04 (32 bit).

Thanks,

CC

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2012-12-04 04:53:09 -0600 answered a question robot camera calibration

Hi, Davinci:

Thanks for the pointer. I will try it out.

CC

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2012-12-03 12:59:51 -0600 asked a question robot camera calibration

Hi,

Is there any ROS package to calibration extrinsic parameters of a camera with respect to its mounting frame? I looked at camera_pose_calibration and camera_pose_toolkit, it seems to me that both packages do it through a second camera whose pose with respect its mounting frame or a robot (referred to as URDF cam frame) has been calibrated (i.e. a URDF cam frame is available). My question is that how to do it without any known URDF cam frame.

Thanks in advance.

CC

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2012-11-09 07:38:30 -0600 asked a question PGR Flea3 Gige Camera streaming problem.

Hi,

I was using pgr_camera_driver (from CCNY) to get image stream from a PGR Fleas3 Gige camera. However, image streaming stopped after a few tens of images were received and published. Does anybody have similar problems or know what is the cause of the problem. I am using ROS fuerte and Ubuntu 11.04 (32 bit).

Thanks,

CC