No camera image in RVIZ?
I am using ROS Indigo on Ubuntu 14.04LTS. Previously I am using my camera with RVIZ with no problem but today when I try to run my system as usual, the camera panel of RVIZ does not display my image...
View ArticleIssue with usb_cam: select timeout yuyv usb_cam package
Hello, so my issue has to do with the yuyv pixel format in the usb_cam package. My launch file and everything works well with mjpeg and I can't understand why. I have installed and reinstalled OpenCV...
View Articlehector quadrotor is publishing greyscale image
Hello, I am using hector_quadrotor in Jade, and in the middle of my simulation the Hector Forward Cam starts do publish a greyScale image. If I modify thet world inserting a Husky, for example. Can you...
View Articlehow to modify and publish camera_info?
Hello. I would like to make a cropped image from raw image in python. In my program, I can subscribe `/usb_cam/image_raw` (`sensor_msgs/Image`, height=480, width=640) and `/usb_cam/camera_info`...
View ArticleHow can I add a floorplan image in rviz?
I would like to be able to add a floorplan image in rviz simply to debug localization. My map is feature-based, so the image would have no other purpose than to make visualization richer. Is it...
View ArticleRGB and Depth sensor_msgs::Image vs XYZRGB sensor_msgs::PointCloud2
Hello, So I have ROS running across multiple machines on a limited network, and I have two possibilities, transfer a XYZRGB sensor_msgs::PointCloud2 directly or two sensor_msgs::Image (one rgb and one...
View ArticleSensor image convert and comparision using opencv
Hello All, I want to compare two(or more) consecutive image to detect movement. I am using ros indigo, ubuntu 14.04 and having kinect cam. I am subscribing the topic /camera/depth/image_raw and getting...
View ArticleHow can i get object distance using camera/depth/image_raw
Hello all, I am using the ros topic /camera/depth/image_raw. It publish sensor_msgs::image data with depth information. I can get the image but I do not exactly how can i get depth information. I need...
View ArticleRviz: Display image in 3D scene
Hi For a visual odometry project I'm using Rviz to display what my filter is doing. I.e. I'm displaying the current camera pose, the path the camera has taken and the features it is tracking as a...
View ArticleHow to use sensor_msgs/Image message?
Hi - I'm a beginner on ROS. - I want to use a topic "/usb_cam/image_raw". (this topic is usb_cam package) - So I made a package, and a Subscriber. - However, there is still error in the catkin_make...
View ArticleERROR: Advertise a service already advertised in this node
Folks, I am subscribing to a compressed image published (or republished) by image_proc (it takes my rgb_raw, and publishes rectified rgb and mono images, including compressed versions). But when I...
View ArticleWriting a Simple Image Publisher (C++) tutorial does not compile
I am running ROS Kinetic on a Raspberry Pi 3 with Debian-Jessie operating system. The tutorial is here: http://wiki.ros.org/image_transport/Tutorials/PublishingImages I follow all the steps exactly....
View ArticleWriting a Simple Image Publisher (C++) tutorial Segmentation Fault
I am running ROS Kinetic full desktop install on Raspberrypi 3b running Debian Jessie. These are fresh installs with nothing else added. I followed the Simple Image Publisher/Subscriber tutorials and...
View ArticleRegression with indigo, freenect and depth images?
Hello all, Up to a few months ago I used a kinect with depth images the following way: roslaunch freenect_launch freenect.launch rosrun image_view image_view image:=/camera/rgb/image_raw rosrun...
View ArticleStore Published Image into cv2.VideoCapture()-Like Object
Folks, How can I store published images into a video-like OpenCV object, without having to create a video file (e.g. .mp4) first? Does not have to be a VideoCapture() object, but just any object that...
View Articlerosbag Image Decompression With API
Folks, My rosbags all have compressed image topics ONLY. I want to grab the images from my rosbag and decompressed them through the rosbag API (or through code, in general). I believe that should be a...
View Articlecv_bridge in a class leads to segfault when cv_ptr->image is accessed
Hi ROS friends, I'm having an issue where when I get my `const sensor_msgs::ImageConstPtr &msg` in my callback function, and do a ` cv_ptr = cv_bridge::toCvCopy(msg,...
View Articlehow to save the displaying map and plotted data in rviz on an image file
Hey All, I use rviz for visualization of path planning. How do I save the displaying map and plotted paths traversed by the robot on an image file like png or jpeg? I need to import the plotted data...
View ArticleHow to correctly publish and receive cv::Mat using cv_bridge? (C++)
Hey everyone, I am having troubles converting a `cv::Mat` to a `sensor_msgs/Image`, publishing it and doing the reverse operation to regain the original `cv::Mat`. The `imshow()` function shows me the...
View ArticleHow to convert ROS image message to OpenCV image array(circle buffer)?
We usually use the below code to convert ROS image message to OpenCV image **cv_bridge::CvImagePtr cv_ptr; cv_ptr = cv_bridge::toCvCopy(msg, "bgr8"** I need save ROS image message to a circular buffer...
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