Questions tagged [image-raw]
The image-raw tag has no usage guidance.
18 questions
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11
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What are the information represented by echo the topic of camera_info and image_raw?
Hi, I am using a multi camera plugin with SDF and the left and right images are published well in Rviz2. I wish to know the depth/distance of the object from the camera based on the images produced ...
aash
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1
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49
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What is the exact format and size of Image() object?
I cannot figure out what is the exact format of the sensor_msg Image() file. When I issue the command:
rostopic echo /camera/image_raw
I get a massive output ...
Tejas Rao
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2
answers
199
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How to decompress compressed image topic?
Hello people,
I have a question on how to decompress image topics. I have a /D435/color/image_raw/compressed image and I am interested in decompressing it and get a ...
Ifx13
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1
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9
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recording only header image_raw message
I would like to record using rosbag only the /usb_cam/image_raw/header topic excluding the data.
Tried:
rosbag record -a -x "/usb_cam1/image_raw/data"
But looks like it is not working. I ...
jptalledo
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1
answer
39
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how to get rgb value from sensor_msgs/image
hello, i need to use rgb value from /camera/color/image_raw topic. i want to know how to get rgb value from this topic.
thank you for answer
Originally posted by Cinnamoroll on ROS Answers with karma:...
Cinnamoroll
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1
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61
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How to understand data from the image_raw/compressed topic?
I wanted to know what they represent and how to read data from the image_raw / compressed topic. For example, the laser / scan topic, your "ranges" data represent the distance to an object, ...
jmva
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1
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47
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How to save camera image when needed?
I am currently following this tutorial to publish image messages using the camera plugin. I can totally subscribe the image_raw topic and save every published image message, but that's not what I need....
wy3
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1
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2
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Not receiving any data from my robot
Main Problem
I am currently trying to check if I am getting any data from the ARDrone 2.0 that I have on my desk. It is connected to the wifi and I can do a roslaunch ardrone_autonomy ardrone.launch. ...
sharan100
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1
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6
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Noise Image_raw from video stream
I have 2 cameras looking at an object, estimating the transformation between two camera images using OpenCV feature matching. I have ROS driver for 2 cameras (gscam). When receiving new image topic (/...
tn0432
0
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1
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6
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Viso2_ros without camera_info
Hi all, I'm trying to compute visual odometry using a stream of images (left and rigth) from a server
These images come without camera_info, but i have a calibration file
cam0:
T_cam_imu:
[0....
dottant
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1
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18
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How to retrieve XYZ co-ordinates from a raw depth image?
I am taking a depth image from /camera/depth_registered/image_raw and thresholding it to find objects within a certain range. I would like to find the xyz co-ordinates of these objects in order to ...
neb42
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1
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8
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How to subscribe visp_auto_tracker to /usb_cam/image_raw/compressed?
Hi all,
I am wondering if this is possible, since just subscribing to /usb_cam/image_raw causes a lot of lag, and the visp_auto_tracker debug display window will freeze up. Here is my launch file to ...
Alvin
0
votes
1
answer
9
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Using rostopic /image_raw for VideoCapture in OpenCV
Hello,
All of a sudden, I need to change my approach from calling TheVideoCapturer.open(0); (TheVideoCapturer is of a class VideoCapture) to open my internet camera ...
delta785
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1
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53
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How can I get the metric distance from the topic "camera/depth/image_raw"?
I am learning turtlebot_simulator. I run turtlebot_gazebo. Then I subscriber the topic "camera/depth/image_raw" using Python.
but How can I know the exact distance of each point from the ...
Consider1001
0
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1
answer
24
views
How can I see images from usb_cam?
Good afternoon.
I have usb_camera installed on my groovy raspbian.
I have done : rosparam set usb_cam/pixel_format yuyv and after that I wrote : rosrun usb_cam usb_cam_node
I´m being given :
usb_cam ...
4LV4R0
0
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1
answer
2
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Webots version 7.1.2 problem with image_raw / Nao Robots / ROS
Hello there,
Our group has been trying to get a video feed from a Nao Robot in Webots, using ROS. We've successfully managed to obtain a video image from the top camera (ID:"/CameraTop_frame"...
Dominic
0
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1
answer
12
views
Image Transport Compressed issue for Depth Image - ROS Fuerte
Hi,
I am using Depth Image for one of my applications, where I need to use compressed image transport for some server/client app.
If I use param -> "_image_transport:=raw", everything ...
Sourav
0
votes
1
answer
2
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rostopic for Kinect
Which is the exact rostopic for Kinect raw image viewer.
Originally posted by Arjun PE on ROS Answers with karma: 18 on 2012-08-08
Post score: 0
Original comments
Comment by Lorenz on 2012-08-08:
...
Arjun PE