All Questions
49 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
0
answers
16
views
AttributeError when trying to reinsert modified images into ROS2 bag file with Python
I'm currently working with ROS2 and Python to process image data stored in a ROS2 bag file. My task involves extracting images from the bag, performing modifications, and then reinserting them. I am ...
- 1
0
votes
0
answers
209
views
ROS2 CV2 imshow and publish in the same loop fails
I attempted to publish and display an image from a video using cv2 and ros2. Although the code compiled successfully, running it consistently resulted in a memory allocation failure. Could someone ...
1
vote
2
answers
1k
views
Converting a ros2 bag of color raw images to image files or video
This is using ros2 Humble in Ubuntu 22.04 and native Python 3.10
Eventual goal: capturing depth aligned RGB and Depth streams from Intel RealSense D435 camera and converting them to RGB and Depth ...
- 203
0
votes
1
answer
56
views
CMake detects intended OpenCV+CUDA, but runtime does not use intended OpenCV version
CMakeLists.txt contains
...
MrOCW
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
0
votes
1
answer
171
views
ModuleNotFoundError: No module named 'cv_bridge' IN windows10 running foxy
I was following this tutorial https://automaticaddison.com/getting-started-with-opencv-in-ros-2-foxy-fitzroy-python/ to implement a simple ros2 image publisher and subscriber. everything was built but ...
aniketwagh
0
votes
1
answer
11
views
cv_bridge and OpenCV both define Exception class
I am trying to use cv_bridge in my project on Windows 10 using Visual Studio 2017. When I try to compile my code, I get the following errors:
...
sterlingm
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
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
2
answers
37
views
How to specify my own OpenCV3 for cv_bridge
The ROS1 package cv_bridge can be downloaded here: https://github.com/ros-perception/vision_opencv.git and be found at ...
bear234
0
votes
1
answer
8
views
image stream using camera
Hello guys,
My question might seem easy for many since i am still fresh in Ros and Opencv.
I am following the tutorials provided on Ros Website. I am going through the tutorial ''Converting between ...
Firoooo
0
votes
2
answers
137
views
Conversion from 32FC1 to mono8 using cv_bridge
I am trying to use cv_bridge to convert an image from /disp_map/image (32FC1 encoding according to msg->encoding ) to an ...
jeanpolochon
0
votes
1
answer
4
views
Is ROS Kinetic compatible with libopencv-dev-2.4.9?
The REP link suggests to use opencv 3.1.x with ROS Kinetic. However, since the system package libopencv-dev 3.1.x version isn't available in the upstream ubuntu repository yet, I had installed ...
sam26
0
votes
2
answers
8
views
Problem viewing images using python-opencv
I have trouble viewing color images from R200 realsense camera using the python-opencv interface.
The window is blank when I run this script.
When I comment out'cv2.namedWindow("Image window"...
pnambiar
0
votes
1
answer
9
views
Convert cv_bridge Image to cv::Mat image
I would like to have a pure OpenCV version cv::Mat of the Image on which I can do further modifications. I tried ...
user23fj239
0
votes
1
answer
2
views
opencv3.0 ros indigo
Hi,
I want to use opencv 3.0.0 in ros but I have troubles linking my code. When install ros-indigo-desktop-full there are dependencies to opencv2.4 for some pkg like cv_bridge or image_pipeline.
When ...
pmarinplaza
0
votes
1
answer
2
views
At an impasse using OpenCV
Hi all,
I have this snippet of code that was copied from one of the tutorials on cv_bridge:
...
chilypepper
0
votes
2
answers
12
views
CvBridge conversion problem: Asus Xtion depth image to OpenCV
Hi,
I have a Asus Xtion sensor being driven by the Openni2_launch package. I subscribe to the "/camera/depth/image" topic and attempt to convert the ImageConstPtr& data type to an OpenCV ...
WillAndrew
0
votes
1
answer
11
views
How to publish images quickly
ROS Indigo, Python, OpenCV (cv_bridge)
I wrote a node that does differential imaging on the webcam feed from a Kinect, but when I publish the final images and try to view them in image_view, the frame ...
troman
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
1
answer
4
views
Unable to view camera output while using cv_bridge
I am using ROS Hydro in Ubuntu 12.04 which is installed in Virtualbox. I am trying to use cv_bridge to convert my ros images to opencv images captured by Logitech C270.
Being a novice to this field, I ...
Anand
0
votes
1
answer
3
views
Black image for an Image publisher with image_transport
I made a node retrieving an image with openCV explained on this ROS tutorial. The image is ten converted into a format suitable for ROS, using CV_bridge functions.
Problem is, there is no image that ...
Alexandre.Willame
0
votes
1
answer
25
views
Is it possible to convert depth messages as Ipl image using CvBridge
I could convert RGB messages in to picture but says that the "[32FC1] is not a color format. but [mono8] is. The conversion does not make sense". Is there anything else i should be doing?
my ...
shravan
0
votes
1
answer
3
views
streaming AR.Drone 2.0 images to OpenCV
I'm following these tutorials to stream images to OpenCV format from the /ardrone/image_raw topic.
http://wiki.ros.org/cv_bridge/Tutorials/...
voladoddi
0
votes
1
answer
167
views
ImportError: No module named cv_bridge
Hello all, I am trying to subscribe to a kinect publisher, grab an rgb image and convert it to an ipl image so I can manipulate it with opencv. I am using Fuerte and Ubuntu 12.04 and I am writing the ...
Gideon
0
votes
1
answer
27
views
sensor_msgs::CvBridge’ has not been declared
Im currently using Ubuntu and running on ROS groovy. I just started using ROS and opencv. Trying to capture image using my Asus Xtion Pro and using opencv codes.
Im starting on tutorial: Running the ...
Azl
0
votes
1
answer
14
views
No image display window in cv_bridge tutorial. (Does compressed image matter?
Hi,
I'm following the cv_bridge tutorial
The code is correct(I just copy the code and change the topic name to mine /camera/image ), also modified the CMakeLists....
lanyusea
0
votes
1
answer
5
views
How to work with kinect frames in RGB color format using cvbridge
I am trying to process color kinect frames following the tutorial from the link working with cv bridge. I have a training image juice_color.png which I can visualize as RGB. I specified the encoding ...
SM
0
votes
1
answer
1
view
harris detector in callback
I have been trying to implement Harris corner detector. But the result are pretty skewed. There is always some symmetry in the detected corners as shown in the image below which definitely is not true....
espee
0
votes
1
answer
8
views
How to realize image processing with ROS and opencv
Hello,
I try to realize image processing with ROS and opencv, and I follow the tutorial of cvBridge. Then I really want to know, whether it is true that we can only do the image processing in the ...
anthonyli
0
votes
1
answer
15
views
Can't process image using cv_bridge
I'm using a library called 'tpofinder' to recognize textured objects,but it can only work using opencv's videocapture() function,and it's very slow,about 1 fps or less.
I'm using CMake to build it,in ...
Starsky Wong
0
votes
1
answer
6
views
Error in using cv_bridge: communication ROS - OpenCV
I'm using OpenCV in order to elaborate frames of a video stream acquired from a simulator (vrep) through ROS Topic: as suggested by the ROS guide i'm doing that via cv_bridge. In that example the ...
mateo_7_7
0
votes
1
answer
23
views
Storing sensor_msgs::Image from cv_bridge
Hello everyone,
I am having some trouble to store the result of cv_bridge::CvImage::toImageMsg() as a sensor_msgs::Image.
The reason why I want to do this is because the sensor_msgs::Image belongs to ...
Geropan
0
votes
1
answer
27
views
ERROR: Cannot load message class for...Are your messages built?
hi, i'm trying to use this simple program to acquire an image from a ROS node (in gray-scale), convert it via cv_bridge (in order to elaborate it through OpenCV), find the middle point of some stains ...
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
1
answer
8
views
Coding using OpenCV2 ROS
#include stdio.h>
#include iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/features2d/features2d.hpp"
#include "opencv2/highgui/highgui.hpp"
#include &...
Bala
0
votes
1
answer
6
views
Query a frame from a video passed as a message by ROS to OpenCV
hi everybody,
I'm trying to extract a frame from a video passed by a ROS node to OpenCV. Obviously I made the necessary conversion (via cv_bridge) exactly as suggested in ros.org/wiki/cv_bridge/...
mateo_7_7
0
votes
1
answer
2
views
Error when converting IR kinect image to CvImage using cv_bridge
Hi guys,
I am trying to obtain the IR images (of type const sensor_msgs::ImageConstPtr& image) from the kinect, copy this image to a class attribute ...
K_Yousif
0
votes
1
answer
14
views
Corner detection using opencv and ROS
Hi guys,
I have implemented an algorithm that uses the opencv2 Harris corner detector. I have a few questions, but first let me explain my system: I have copied the opencv2 Harris corner detector and ...
K_Yousif
0
votes
1
answer
3
views
Error building cv_bridge on RaspberryPi
I am trying to build some libfreenect drivers (for the kinect) and I do a rosmake and it fails in cv_bridge complaining about some image formats (e.g., CV_YUV2RGB_UYVY, see below for more).
...
Kevin
0
votes
1
answer
4
views
cv::bilateralFilter segfaults on image from cv_bridge
I have a ROS node that takes in a depth image and converts it to an openCV compatible format. However it doesn't seem to be compatible with all openCV functions.
...
Daniel Canelhas
0
votes
1
answer
5
views
cv_bridge and IplImage -> Mat when going from OpenCV 2.1 to OpenCV 2.3?
Hello,
I am trying to use some of the newer Python sample code included with OpenCV 2.3 while also using cv_bridge in ROS Electric. It appears that most of the sample code (such as the lk_track.py ...
Pi Robot
0
votes
1
answer
5
views
OpenCV Error: Image step is wrong () in cvInitMatHeader
Name : left_mat_
Details:{flags = 1124007936, dims = 2, rows = 480, cols = 752, data = 0x80b6bc8 023"..., dataend = 0x8110bb8 "", datalimit = 0x8110bc8 "", allocator = 0x0, ...
wyosae67
0
votes
2
answers
3
views
cv_bridge and OpenCV 2.3.2
Hi!
im using ROS Electric installed from sources and OpenCV from svn and its has version 2.3.2
but if im trying to make cv_bridge
rosmake cv_bridge
it want to use ...
noonv
0
votes
1
answer
38
views
openvc/cv_bridge encoding
Which encoding is most appropriate for using cv_bridge to convert cv::Mat_<cv::Vec3d> matrices into ros images?
Originally posted by Aditya on ROS Answers with karma: 287 on 2011-09-21
Post ...
Aditya
0
votes
1
answer
28
views
How to synchronize image and marker display between two ROS nodes
I have two ROS nodes, a "display node" and a "detector node", that both use cv_bridge and subscribe to the same image topic. The detector node publishes an array of ROI boxes ...
Pi Robot
0
votes
1
answer
54
views
Convert from a sensor_msgs::CompressedImage message to IplImage
I'm saving test videos in a JPEG compressed bag file. Then I try to use it as input to a subscriber that listens to the "/camera/image/compressed" topic and convert it to OpenCV's IplImage ...
GeorgeAprilis