Questions tagged [cameras]
A camera is an optical instrument for recording or capturing images, which may be stored locally, transmitted to another location, or both.
178 questions
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Trying to Synchronize and Run 2 Primesense Depth Cameras at the Same Time
I am trying to run 2 Primesense Depth Cameras simultaneously. I was recommended that ROS is able to run the code on this thread: https://answers.ros.org/question/106241/using-multiple-primesenes. I ...
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What are my camera interface options to integrate with Jetson for ORB-SLAM3? [closed]
I want to try out drone visual odometry using a thermal camera and ORB-SLAM3 running on ROS and Jetson. The device would likely be Orin Nano or AGX Xavier but I'm flexible on this and will use ...
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ros2 humble integration with Zed2 Camera
Can anyone assist me in integrating the Zed2 Camera with my robot's URDF? Additionally, I aim to generate a Moveit2 configuration for my robot after integrating the camera. Could you please review the ...
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Switching between 2 cameras (using opencv)
I have a manipulator in ROS and 2 cameras attached on it.
I want to switch the frames of cameras every 5 seconds
Both cameras work fine.
I do not want to close the window and reopen it (if it is ...
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How to access devices in webot robot?
I have trouble finding out what devices are in my robot currently I am using e-puck but I want to use a robot such as the Tesla car. I want to know what devices I can control. Example if e-puck has 2 ...
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Gazebo Garden : Green line in camera image with OGRE 1 render engine but not with OGRE 2
While loading the same map in gazebo garden with ogre 1 or ogre 2, the map looks the same in the GUI, but a green line appears in the camera image when using ogre1 (no distortion or noise applied, ...
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Detecting door blockage using computer vision
I want to detect door blockage on a camera. Basically if the exit door is blocked by an object, it detects it as an anomaly. How can we do it? Is it possible to do it using OpenCV?
Remember, it doesn’...
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How can I build a mobile app that will publish images to ROS? [closed]
I'd like to build a simple mobile app that allows the user to click a picture and then publish that picture via a topic to ROS.
How can I connect the app and ROS? What would my development environment ...
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How do I record video from webots simulated cameras?
I'm currently trying to find a way to record the output from Webots cameras to video files. Currently I'm saving frames every cycle and converting them to videos afterwards using Shotcut. Is there a ...
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Robot exploration algorithm
This might be a more theoretical question than a practical one, but I couldn't find a more fitting Stack Exchange (if you know of one, please point me in the right direction?).
I have control of a ...
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Cannot solve extrinsic matrix between camera and robot
I am triying to calibrate a RGB-D Realsense camera , with an eye in hand configuration. I have the following set-up:
I know the transformation matrix between base/ef and cam/obj. I want to solve ...
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Minimum distance that can be measured using Rplidar A1M8
can you please explain what is the minimum distance that can be measured using RPliadr A1M8
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How to test moveit handeye calibration?
I have a KUKA iiwa 14 and a realsense D435i camera. I calibrated the system using a hand-to-eye configuration in Moveit! Hand-eye calibration package. But I would now like to test the accuracy of the ...
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[Raspberry Pi]: ROS 2 Humble on Ubuntu 22.04 Server: v4l2_camera reports "Failed stream start: Invalid argument (22)"
I have ROS2 Humble installed on Ubuntu 22.04 Server (64-bit) on a Raspberry Pi4.
When I run the v4l2_camera node it finds my Pi Camera (v1.3) but then complains:
Failed stream start: Invalid argument ...
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Camera Calibration Matrix accuracy
When we do camera calibration, we have to find calibration matrix $M$, which is found by first finding extrinsic matrix and then intrinsic matrix. To validate the accuracy of calibration matrix, we ...
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Robot-to-robot relative position over time?
I have 3 robots and I know the starts and end coordinate of each of them. For example for Robot 1 I have Xr1, Yr1 and Xr2,Yr2 coordinates pair , same for Robot2 and 3. I have lateral cameras so can ...
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What is Rotation when pose is looking back?
I've model a relative pose between two cameras. $T_0$ is origin and $T_1$ has the relative pose.
The $Camera_0$ is facing a the map point $X$, and I can get a vector $v_0$ from $Camera_0$ toward $X$.
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Vision programming with OpenCV
I am currently working on a project on NiryoOne which requires facial detection of a person through NiryoOne camera (ELP SONY IMX).
The code that I am using works on my laptop running Ubuntu. However, ...
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How to get transform between two fixed frames using a camera
In my task, I have two manipulators: one 6 dof robot (Manipulator 2 as shown in attached link picture), and one passive arm (Manipulator 1 as shown in attached link picture). Both the frames 1 and 2 ...
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Uncontrolled drift of Visual Inertial Odometry
I'm trying to use the VINS-Fusion package to obtain odometry for a quadcopter. The primary sensor is an Intel Realsense D435i. I've calibrated the camera and IMU extrinsics using Kalibr. IMU ...
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Sending Universal Robots UR5e to specific place Using Camera
I have a UR5e installed with a simple camera on its end effector. The robot is at a known position (Cartesian pose/angles and joint angles)
Using the camera I took a picture of a QR code and got the ...
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How to make a synchronized LiDAR/Camera rig for Autonomous Driving research?
I am just starting a research project at my university involving sensor fusion between a Camera and a LiDAR device to detect and localize cars around our vehicle (bounded boxes around cars in 3D point-...
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3D LiDAR synchronization with RGB Camera
There's a general procedure for estimating projection transformation between camera and 3d LiDAR but there's a secondary problem which is associating pixels with depths in a grid which isn't uniformly ...
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Mobile robotic arm camera position
I'm working on my graduation project which is a mobile robotic arm that performs pick and place tasks.
I wanted to know the possible ways to mount the camera where i can reach the desired destination ...
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six cameras selection for jetson xavier
What six cameras do you recommend for a university project using a jetson xavier nx?
I am getting into self driving from a software point of view and camera selection becomes very difficult for me. I ...
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Searching for object in an unknown environment using ROS
Using ROS, I'm trying to build a robot able to search for specific objects in an unknown environment. Right now, I'm experimenting with a mobile robot in a simple gazebo maze, using a LIDAR for ...
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ROS Camera Calibration for Webcam - Not working
As a part of learning, I am trying to perform Camera calibration with my laptop's Webcam. I am really new to this process. I will explain everything about how far I have come so far, and where I have ...
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Reflective surface
Have you encountered the problem of reflective surfaces for realsense camera (d435 or t265) and lidar (A1 or A2). I would like to know what are the ways to solve problems with reflective surfaces for ...
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Number of pixels required to identify something
When using an RGB camera, what is the minimum number of pixels of an object that you need to identify something (theoretical or rule of thumb)?
The image would be taken out in the wild with a complex ...
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How to calculate extrinsic calibration of a non-overlapping multicamera rig?
thanks for taking the time to check my question. Firstly, let me describe the current configuration, I am using 4 cameras that produce non-overlapping images and the goal is to calculate their ...
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Cheap global shutter cameras with external synchronization
Please recommend cameras for multi-camera setup satisfying the following conditions:
Relatively cheap (up to 100$ per camera).
Global shutter.
No filters on lenses or pixels.
Resolution of 1 MP or ...
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ROS Publish Stereo Image From 2 USB Cameras
I have two monocular USB cameras and I want to use ROS to make it a stereo camera. I am having a hard time finding a ROS package that consumes 2 monocular camera image streams and publishes a depth ...
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Use 2 Cameras as 1 Stereo Camera
I have one Picamera and one normal USB Webcam and would like to use them together as one stereo camera. Is this even possible as the 2 cameras aren't exactly the same? I would like to use them in ROS ...
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ROS Webcam Stream Really Slow
I am trying to stream the images from my camera to a VM via ROS. Here is my setup:
Raspberry Pi 3B+ with Picamera v2. It is running ROS Noetic with cv_camera_node
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Visual Odometry terminology: Scale, Relative scale, absolute scale
I'm watching a MOOC about Machine Vision for Robotics, but I really do not know the meaning of some vocabulary of this domain.
For example, What does the professor mean when he says this:
However, we ...
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Trouble aligning/calibrating camera with laser scanner
I have a robot which has 2 multi-spectral cameras and 1 laser scanner attached. In the end I would like to have the images from the cameras aligned with the scanner so that I can have spectral ...
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Is two cameras equivalent to Stereo camera setup?
I have two webcams, which are mounted close together. I plan to use them to find out the true depth of certain pixels of images. Suppose I use a standard multi camera calibration setup and find out ...
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IMU-Camera Senor Fusion
I am working on fusing IMU and Camera Sensor Fusion for the Drone to precisely land on the target location.
With the Camera, I am tracking the April Tag which is on the ground. This gives me the x,y,z ...
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What are the parameters that I need to consider when figuring out the horizontal viewing distance of a camera mounted overhead for effective tracking?
I am currently working on developing a hybrid Indoor Positioning system where images from an overhead camera will be used to identify and track people.
I am new to the field of visual tracking and a ...
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3D reconstruction of a moving object from two camera video stream
I have two synchronized video streams of a moving deformable object from two different cameras (same brand/model type) but two different views.
How can I do the 3D reconstruction of this moving object?...
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How well does object detection transfer from simulation to reality? [closed]
I'm looking to learn more about this sim-to-real gap. I'm new to the concept and am trying to understand what to look for. Most notably i'm curious about how well an object detection algorithm trained ...
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Size of smallest feature from pixel depth resolution
How do I get the size in mm of the smallest feature a depth camera can detect?
Known variables are: distance from the target (for instance 1 meter), depth resolution in pixels (for instance 1280 x 720)...
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How can I calibrate 3 cameras without knowing global pose of the object & camera locations? How can I find the pose of each camera wrt the first one?
I have camera feed (in the form of RGB images) from 3 cameras with partially overlapping Field-of-view i.e. for the time stamp 0 to 100, I have total 300 frames or say synchronized 100 RGB frames for ...
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What does the normalized image coordinates imply?
In VSLAM or visual odometry, we use a camera matrix P to transform 3D scene points to 2D image points. When using homogeneous representation, we may choose the image coordinates as the normalized ...
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Automatic License Plate Recognition System in Highway
We are working on a computer vision project where an automated robotic system will be deployed on a 3-lane highway.
We are using a bosch IP camera (I don't remember the model exactly, but it cost ...
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How to find visual odometry by video from cellphone camera mounted on robot?
I am writing codes in python for visual odometry from single camera. I used cell phone camera for testing. I took video of 35 sec with camera moving. I used code below to read first image
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Camera Pose Estimation
What is the minimum number of point correspondences required for camera pose estimation given the perspective projections of points with known world coordinates?
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What is the definition of the phrase "ego robot"?
What does the phrase "ego robot" mean? I see it used in the context of multi robot systems like in the paper Game Theoretic Motion Planning for Multi-robot Racing by Zijian Wang, Riccardo Spica & ...
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What type of camera parameters are ideal for image processing on a moving platform?
What type of camera or camera properties should I look for that would be ideal for performing image processing in a moving environment?
I'm researching the sensor requirements for processing video in ...
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