All Questions
32 questions
0
votes
1
answer
186
views
cv_bridge.h not found ROS2
I need cv_bridge on my cmakelist.txt. Cmakelist shows a path for cv_bridge.h, however there is no file on that name at that path.
I have opencv 4.5.4,ros2 humble.
I tried to install cv_bridge by ...
- 1
0
votes
1
answer
39
views
Create self-contained standalone ROS1 application for Windows
I created a ROS Noetic package that grabs data from some cameras and performs pose estimation of objects in the field of view (using OpenCV). Simultaneously, IMU data is measured and fused with these ...
1
vote
2
answers
130
views
colorize area of point cloud on a 2D image
I am projecting a 3D Point Cloud on a 2D image incoming as ROS 2 messages. Now, I want to fill the gaps between pixels from the point cloud, so that I can see an area, instead of single pixels and ...
- 53
0
votes
0
answers
100
views
Segmentation fault in cv::findContours call
I am struggling to debug a segmentation fault. Any help is appreciated! The node just crashes whenever I launch it and following is the seg fault I am getting when running through gdb:
...
- 1
0
votes
1
answer
24
views
Convert CameraInfo K & D to OpenCV format convenience functions?
Are there existing functions to convert from camera info arrays of K and D to intrinsic and distortion cv::Mats that can be passed into opencv functions like ...
- 3,397
0
votes
1
answer
373
views
Configuring ROS2 for OpenCV and C++
How to properly setup the ROS2 workspace (i.e., cmakelists and package.xml, etc.) for using OpenCV and C++ ?
I could not find proper examples for that.
Thanks in advance.
Originally posted by ...
Werewolf_86
1
vote
1
answer
578
views
ROS2: How to publish cv Mat image?
I'm having trouble understanding how to publish a cv::Mat image in C++, and I can find very little documentation about this.
Here's my publish code. I based it on this tutorial: https://docs.ros.org/...
zjeffer
4
votes
1
answer
363
views
Does a stable library exist for docking robots using images?
I built a mobile base from scratch, and now I am focused on getting the robot to charge.
The robot is using an on-board webcam (and PC) to detect a QR barcode on the charger unit. Using OpenCV I find ...
- 361
4
votes
1
answer
93
views
Make robot drive as far from obstacles as possible
I am trying to make robot drive around the room, avoiding obstacles with pathfinding. The problem is I get few waypoints from pathfinding algorithm for robot to drive to (green dots), but it drive a ...
- 41
0
votes
1
answer
3
views
Combines message for image and information gives "invalid initialization error"
Hello,
I am currently trying to implement a message that includes the images as well as the detected bounding boxes.
The publisher works very well, but the subscriber gives me the following error ...
MarviB16
1
vote
0
answers
711
views
How to make a line following algortihm for an A.R Drone 2.0? [closed]
I am trying to develop a line following algorithm where a drone will detect a bounding box and follow what is inside the bounding box.
I am filtering all the colors to only see the color white. Once ...
- 11
0
votes
1
answer
11
views
New problem linking OpenCV Indigo Cplusplus node
Indigo, Ubuntu 14.04 (Linux Mint 17.1)
I had a problem the other day that turned out to be missing find_package(OpenCV) so that was resolved.
But I have a new one. I have a better tracking test that ...
burtbick
0
votes
1
answer
11
views
CMakeLists pkg-config opencv C++
I made program with "opencv2/nonfree/features2d.hpp" like this include.
#include "opencv2/nonfree/features2d.hpp"
When I compile the program, I ...
sora
0
votes
1
answer
277
views
Save Depth Map Video
I have recently purchased an Orbbec Astra camera, which uses the same technology and produces the same style depth map as a Microsoft Kinect.
What would be the correct file format to save the depth ...
- 153
0
votes
1
answer
2k
views
CompressedImage to an Image in a node
Update
Hey I have the following subscriber on Nvidia TX1 board running on an agricultural robot. we have the following issue with subscribing to Sensor_msgs::Compressed:
...
- 101
2
votes
1
answer
1k
views
Stereo Vision Using Compute Module: Pi camera synchronization
Good day,
I am currently working on an obstacle avoiding UAV using stereo vision to obtain depth maps. I noticed that the quadcopter would sometimes not steer to the correct direction.
I am using ...
- 714
0
votes
1
answer
5
views
Kalman filter of opencv doesnt work in ROS
Hi, im trying to adapt a Kalman filter cpp code to a node cpp in ROS, but in the very beginning, the initialization goes wrong, more precisly, when i try to set the matrices, this is the relevant ...
erivera1802
0
votes
1
answer
13
views
Sensor msg to an opencv image
I am attempting to convert a sensor_msgs/Image msg into something displayable in opencv. I am using cv_bridge to accomplish this conversion. When I catkin build, I get:
...
idkm1
0
votes
1
answer
73
views
Working with cv_bridge and OpenCV correctly
Hello, I am struggling to use cv_bridge correctly. Do I have to convert the cv_bridge to a cv::Mat, before I can use OpenCV's functions?
My situation is the following: I wrote a simple OpenCV ...
soulfutterer
0
votes
3
answers
27
views
Ros not responding to keypress to WaitKey
Hi guys..
I am using openCV to run some video processing, in which i switch 2 algorithm, and the switch is performed by the user, from a key press.. The only problem is though i am not able it make ...
215
0
votes
1
answer
4
views
Why is my callback function not called
I trying to understand why my subscriber isn't outputting anything.. It seems like, it doesn't get called, but it doesn't make sense why it doesn't...
Anyone who could explain??
...
215
0
votes
1
answer
8
views
AR DRONE 2.0 Tracking
Hello, I'm using ROS, OpenCV and Eclipse with an AR DRONE 2.0. My question is: How can my drone follow an object? I installed ardrone_autonomy and tried some tutorials to convert my video on image to ...
huevos
0
votes
3
answers
16
views
ROS Answers SE migration: imwrite error
cv::imwrite("/home/jros/image.jpg",cv_ptr->image);
I want to save an image using imwrite but I get this error when I launch the node:
...
ROSkinect
0
votes
1
answer
11
views
Save an image during the subscription
Using that simple program how can I save an image during the subscription: like when I press a key (ctrl+s for example or s) I get an image *.jpeg file (or other extension doesn't matter) ?
...
ROSkinect
0
votes
1
answer
12
views
Bird's Eye Projection in OpenCV
I'm using OpenCV to try to get a bird's eye projection of this image:
I first find all the inner corners of the chessboard and draw them, as shown here
I then use warpPerspective() on it but it ...
joshualan
0
votes
1
answer
1
view
return an array from a function member of a class
I'm using ROS and OpenCV in C++ environment in order to acquire a video (gray-scale) from a ROS node, convert the data through cv_bridge (in order to elaborate it through OpenCV), extract some data ...
mateo_7_7
0
votes
1
answer
7
views
error: cannot convert ‘cv::Mat’ to ‘const CvArr* - Video from ROS node to OpenCV
hi, i'm trying to receive a video from a ROS node and elaborate the data of the frames and publish some stuff.
this is my code (i'm using cv_bridge as suggested by ROS documentation in order to ...
mateo_7_7
0
votes
2
answers
11
views
New C++ API Documentation for OpenCV
Hi,I have 3 questions:
Is it possible to use the old API C++ for OpenCV while writing code in ROS?
If is not, does anybody know where can I find good documentation for the new OpenCV C++ API? some ...
DavidLavy
0
votes
1
answer
4
views
Multiple Camera recording with openCV
Hi, atm my goal is to connect several standard USB webcameras (2-4) to one single computer and try to run/record them at the same time.
I'm using MSVS with C++ and the openCV libraries.
Getting data ...
wtom
0
votes
1
answer
10
views
Undefined reference in cvBridge.h
I just updated to Fuerte and Ubuntu 12.04 and I'm trying to build my ROS pacakges on it.
I'm getting errors in my OpenCV code which may be because the OpenCV code I'm building is a little old.
Here's ...
StFS
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
2
views
ROS Answers SE migration: kinect opencv
I'm trying to use the depth data obtained by kinect with C++ program.
I've already installed openni_kinect with the guide(http://www.ros.org/wiki/openni_kinect,
OpenNI itself is installed in this ...
dinect