All Questions
20 questions
0
votes
1
answer
92
views
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
45
views
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
9
views
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
votes
1
answer
9
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
19
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
11
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
34
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
1
answer
5
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
6
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
views
what is the first step of doing image processing with ROS?
hi i am beginner with image processing and want to start that with ROS but i dont know what is the first step ? for example should i first install OpenCV? or its not important ? and may be i should ...
fatima
0
votes
1
answer
72
views
cv_bridge: sensor_msgs::Image to sensor_msgs::ImageConstPtr
Hi there!
I've been having some real trouble with cv_bridge (and, I guess c++ in general); I'm really stumped as to how to solve this issue but I suspect it's down to a fundamental misunderstanding of ...
Pufpastry
0
votes
1
answer
6
views
Get average distance from a depth Rect image
I'm trying to get access to the average distance of some part of an image.
What i've done : Get image from ROS, conver to to OPENCV image, save depth image, crop the image using cv::Rect. So, i get ...
Thiagopj
0
votes
1
answer
5
views
Get data values from depth image
I'm using a turtlebot (Create base) with a kinect. I need to save images automatically (RGB and depth images) when the turtlebot is in front of a object that is less than 1 meter away. Therefore, i ...
Thiagopj
0
votes
1
answer
17
views
Synchronise point Cloud and RGB Image from the same camera
Hello,
I possess a Xtion camera and I'm trying to retrieve the Point Cloud AND the rgb image at the same time through a Callback Function. I tried using message_filters to do this as such :
...
Maya
0
votes
1
answer
15
views
How to use depth value from /camera/depth/image?
I am using this code
topic is: /camera/depth/image
type: /sensor_msgs/Image
According to the code, (msg->data[0]) is ...
Safeer
0
votes
2
answers
43
views
sensor_msgs/CompressedImage decompression
Hi all!
I cannot use this type of data: sensor_msgs/CompressedImage. I've trasformed the originale image stream with the "image_transport" package, to send image over internet. Now i need to ...
pacifica
0
votes
2
answers
2
views
OpenCV, drawing depth map
Hi! I have a little project on C++.
In this project, I I try to find sample image on depth map, received from Kinect. I check results by drawing both images (sample and current scene) in 1 window. ...
CaptainTrunky
0
votes
1
answer
17
views
Opencv python LineIterator returning position information?
In the python sample for InitLineIterator here:
Copied below for convenience:
>>> import cv
>>> img = cv.LoadImageM("building.jpg", cv.CV_LOAD_IMAGE_COLOR)
>>> li = cv.InitLineIterator(img, (100, 100)...
Marrok
0
votes
1
answer
6
views
Camera pose calibration with multiple camera's
Hi,
we're using the camera_pose_calibration package and try to calibrate multiple camera's with it.
We followed the instructions at http://www.ros.org/wiki/camera_pose_calibration - which went well.
...
Steven Bellens
0
votes
1
answer
32
views
Putting a sensor_msgs/Image into a message, getting it back, and converting it for OpenCV?
I'm just doing this wrong somehow.
I've got a Sensor_msgs/Image already. I want to put it into my message which has "Sensor_msgs/Image image" in it's definition.
Can I just do this:
...
Murph