Questions tagged [image]
The image tag has no usage guidance.
146
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Using Image Stitching for X,Y Pose Estimation in Quadrotor Navigation: Feasibility and Limitations
I'm exploring the feasibility of inferring the x, y pose of robots without direct positional data but utilizing image stitching. Here's the scenario: I have multiple drones equipped with downward-...
1
vote
1
answer
38
views
Read h264 compressed images with rosbag API
Below is an example of how to use the ROSBag API to extract image data from a ROSBag file, and then visualize that data using OpenCV.
...
- 111
0
votes
1
answer
2
views
Opening an image file with ros
I want ROS to help me open an image file when a trigger/condition occurs.
For example I have a hello world program, which prints:
hello world [1]
hello world [2]
hello world [3]
when the hello world ...
sajid1122
0
votes
2
answers
80
views
E: Unable to locate package ros-humble-cv-camera
I tried solution from @javisshultz
https://answers.ros.org/question/345764/e-unable-to-locate-package-ros-melodic-desktop-full-or-ros-melodic-desktop/
echo "deb
http://packages.ros.org/ros/...
Orpiczy
0
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1
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13
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Noetic python raw Image publisher (from video)
Hi everyone,
I have spent nearly 2 full days with this problem now and have some extensive research, but just can't figure it out.
My apologies for being a burden, I ussually hesitate to waste anyones ...
USAotearoa
0
votes
1
answer
8
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Image Subscriber Lags (despite queue_size=1 and buff_size=2**30)
Hi,
I have been working on a Python class that will allow me to spawn an object in gazebo, take an image of the object, and then delete that object, for a given number of objects that I provide. I am ...
jdastoor3
0
votes
1
answer
23
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rviz2 not showing images since update - probable QoS
I ran a system update of my Ubuntu 20.04 today. Since then I can not see image topics in rviz2 like before. I assume it is an QoS issue, but I can not solve it.
My rviz version should be
...
basti.hunter
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1
answer
1
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Unsyncronization on image classification of an image topic
Hello.
I am trying to use Tensorflow lite to implement image classification. To do this I subscribe to the RGB image topic of a Realsense D435. Here I declared my subscription and publications:
...
Alessandro Melino
0
votes
1
answer
17
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ROS2 Performance: rclpy is 30x-100x slower than rclcpp
Hi there,
TL;DR: Publishing a typical 10MB Pointcloud on a very fast system takes only 2.8 ms in rclypp but 92 ms in rclpy.
We observed significant latency/performance problems when publishing large ...
Karl
0
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1
answer
5
views
sending image to html
Hi,
I am getting the following error in Rosbridge WebSocket server when I try to send an image to a html web page using roslibjs with cvbridge
"Tried to register topic /camera/image/compressed ...
Jt3d
0
votes
1
answer
6
views
Open image from file with image_publisher
Hi everybody,
I try to publish an an Image (bmp.file) to an camera stream with image_publisher.
I want to display this Image with image_view. But here I got an error.
Can somebody tell me how to fix ...
Lennart
0
votes
1
answer
2
views
realtime image subscriber
Hi,
I wrote a subscriber to subscribe the image message send from the topic /gi/simulation/left/image_raw and convert it using CV.bridge(). However, the problem is that, this subscriber only shows a ...
mingcheng
0
votes
2
answers
5
views
Subscriber - perform callback on 'most current' data received
Hey everybody,
I've been messing a bit with a subscriber node and i'm getting stuck.
Little bit of background:
I have a topic where a camera publishes images with a frequency of 10 hz (ish).
I have ...
Jan Tromp
0
votes
1
answer
10
views
sensor_msgs/Image data to sensor_msgs/CompressedImage data
I have an industrial camera (DVP interface), and I added some code in the driver to convert the cv image into ros image data. I want to use this camera to test the fiducials package. But it needs to ...
anonymous38087
0
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1
answer
1
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Difference between image_transport::Subscriber AND ros::Subscriber?
What is the Difference between image_transport::Subscriber AND ros::Subscriber?.
Which is more efficient?
Originally posted by JeyP4 on ROS Answers with karma: 62 on 2019-03-21
Post score: 0
JeyP4
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1
answer
1
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How to subcribe both Image topic and Text topic in the same time?
Hi buddy,
I am newbie in ROS. And this is the first time i'm trying to subcribe 2 topics type, 1 for Image topic and 1 for Array of ints topic. And i have a problem on it.
This is my source code:
<...
ToanJunifer
0
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1
answer
2
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camera calibration algorithm
Hello everyone !
I wanted to calibrate my camera
( Bus 001 Device 002: ID 058f:3881 Alcor Micro Corp.)
screen
I did everything that was written in this article
and tried with this video
But nothing ...
Alishka2k15
0
votes
2
answers
5
views
Python: message_filter AttributeError when registering callback
So I've wrapped my python node in a class, and I've been trying to approximate sync two messages at once (one being Image and another custom message ...
almond
0
votes
1
answer
1
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Image overlay with transparency (sensors_msg/Image) on mapviz
Hi everyone,
I've written a simple node which reads in a png file with transparency and publishes it to a certain topic. The topic is then subscribed by mapviz to display the image as an overlay. ...
rwong
0
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1
answer
2
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Pointcloud transform issue
I have a setup where I am fusing PointCloud2 and cameras to get XYZIRGB cloud.
pcl::PointCloud<XYZIRGB> points_front, points_back;
Both ...
Choco93
0
votes
1
answer
1
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USB camera does not take any pictures when ROS is launched at system startup
I have been trying to take pictures using a USB cam connected to my Jetson TX2. My code works pretty well when I execute it from terminal using the command ...
erjohn
0
votes
2
answers
6
views
Can I use image transport for the two different image topics?
Using an RGBD camera (RealSense D435), we want to log compressed color images (JPEG 'compressed'), and depth images (PNG 'compressedDepth'). The realsense driver publishes these compressed topics ...
mozer
0
votes
2
answers
2
views
different encodings of depth image for real & simulated kinect
Hi all
I've got a Gazebo simulation of a kinect camera, where I'm subscribing to the ROS topic /camera/depth/image_raw, which is of type sensor_msgs/Image. I also ...
RedJohn
0
votes
1
answer
5
views
sensor_msgs.msg Image type value error. "Not a message data class"
I'm getting a value error when trying to run this code:
front_image_pub = rospy.Publisher('/front_camera/image_raw', Image, queue_size=10)
The precise error is:
<...
SouLeo
0
votes
1
answer
7
views
MATLAB 16uc1 or 32fc1 Conversion
I have some image processing code in MATLAB and am attempting to use it with ROS. I read in a PointCloud2 object and execute readRGB(ptcloud) and ...
cmfuhrman
0
votes
2
answers
5
views
Create a subscriber to an Image topic
Hi,
Im trying to wrtie a node that subscribes to a image topic, however, after almost copying the ros tutorial, I keep getting an error.
The relevant parts of my code are:
...
erivera1802
0
votes
1
answer
6
views
time synchronization
I write the following launch code in order to record synchronized data from 4 topics (color image, depth image, joy command, and IMU)
...
khadija
0
votes
1
answer
2
views
ROS msg including image and related variables related to that image
I need to create a publisher which can publish an image along with a few strings, integers and arrays containing different information about the image (like number of objects, bounding boxes, name of ...
xaggi
0
votes
1
answer
4
views
Pointcloud to pcd file with Timestamp in name
Hello Guys,
i use Ubuntu 16.04 with ros kinetic and gazebo 7.0. I have a Gazebo world with turtlebot in it.
I get some Pointcloud data from /camera/depth/points. Now i want to save this data in pcd ...
Baumboon
0
votes
1
answer
3
views
Increase the frequency at which images are updated in a subscriber
I am using code which tracks the image of a robot. Specifically, the rospy-based code I am using is here.
Here's the relevant part of the code.
...
DanielSeita
0
votes
1
answer
15
views
conversion CV_32FC1 to CV_16UC1
I want to convert a depth message from CV_32FC1 to CV_16UC1. According to docs CvImage should do this..yes?
...
rnunziata
0
votes
1
answer
1
view
How to pass an image (subscribed from a image publishing topic) using service?
Hello People, I am trying to get image from a camera fitted on a robot and pass them using services. I will use a client to grab images from the server and later process it according to the need. It ...
the_notorious_kid
0
votes
1
answer
4
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question on conversion of depth image
I have a depth image (128, 414, 3) type 64FC3. I could like to convert this to be acceptable to send to rtabmap_ros/point_cloud_xyzrgb . However I am not sure how to covert this image into an ...
rnunziata
0
votes
1
answer
1
view
dpptam image transport
I am getting this error running dpptam with a live feed from webcam. I see others with this same error posted around but under different circumstances relating to image transport and ubuntu 16. Can ...
rnunziata
0
votes
1
answer
2
views
Transport Image tutorial issue: subscriber doesn't show image
Hello everyone,
I tried to do the tutorial " Running the Simple Image Publisher and Subscriber with Different Transports " image_transport/Tutorials
but I encountered an issue.
When I run ...
Hysis
0
votes
1
answer
2
views
Faster way to get stereo images at 640x480 from Raspberry pi
Hello All,
I have connected 2 logitech C930e web cameras to a Raspberry Pi3 running a Ubuntu Mate and ROS Kinetic. I want to process the images on my laptop and only remotely see what the Pi sees ...
surajmshanbhag
0
votes
1
answer
31
views
How 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 ...
anonymous28046
0
votes
1
answer
29
views
how 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 ...
A.M Dynamics
0
votes
1
answer
3
views
Writing 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 ...
FAD0
0
votes
1
answer
2
views
ERROR: 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 ...
Pototo
0
votes
1
answer
35
views
How 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
...
anonymous28394
0
votes
1
answer
5
views
how 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 (...
baozhang
0
votes
1
answer
2
views
how to get the image topic from the other computer with WiFi
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 ...
Joy.Lin
0
votes
1
answer
2
views
Extract video from PointCloud2
I have a rosbag file with sensor_msgs/PointCloud2 data. I want to extract a video from these data. All the ROS tools I found is related to the extraction of video from an Image topic. Is it possible ...
rastaxe
0
votes
2
answers
10
views
Which single board computer should I chose?
Hi ros community
I' m working with ros to make a robot which can go itself with image proccessing. I am using lots of hardware in this project and I used pcduino V3 until this time. But I want to ...
baseroguzhan
0
votes
2
answers
8
views
Problem of saving depth image
I try to use the code below to save one frame of depth iamge from topic /camera/depth/image_raw, but the problem is I could only get a image looks black. When I read it in Matlab, the matrix elements ...
Henschel.X
0
votes
1
answer
2
views
Problem of using Turtlebot to process image
Hi, everyone ! I'm doing image processing using turtlebot right now, and I have completed programming on VS Windows, it is going perfect, but when I transformed it to ROS, it just went wrong.
I am new ...
Henschel.X
0
votes
1
answer
3
views
Do all of the OpenCV functions work fine on ROS?
I decide to do some image processing on ROS, and first I did the same job on VS2013 with OpenCV2.4.9 on windows, I am wondering if it is true that almost every functions like cvCvtColor or every data ...
Henschel.X
0
votes
1
answer
5
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creating a custom message type including an image
I'm trying to define and use a custom message type. This message will include a few primitive data types as well as a sensor_msgs/Image.msg type for transferring the image. I have not managed to work ...
PeteBlackerThe3rd
0
votes
1
answer
7
views
How to use OpenCV to process image
Hi! Everyone!
I'm a beginner of ROS, and now I've been focusing on imaging processing on ROS, My robot is Turtlebot, and I use the kinect as the camera, so basically what I need to do is to find the ...
Henschel.X