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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.

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Time Sync'd Multi-Sensor Data Collection System - Resource Request [closed]

I want to design a turn-key system that collects time-synchronized data from various sensors (RADARs, IMUs, Accelerometers, Cameras, etc). This data doesn't need to necessarily be processed in real-...
user40950's user avatar
1 vote
0 answers
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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 ...
Alex Bausk's user avatar
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1 answer
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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 ...
Kedar's user avatar
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How to scale projection matrix?

I was going through the camera calibration lecture by professor Shree Nayar. At 4:49, he is : Scaling the projection matrix implies simultaneously scalign the world and the camera, which does not ...
Mahesha999's user avatar
1 vote
2 answers
164 views

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 ...
user37201's user avatar
1 vote
1 answer
45 views

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 ...
Alan L's user avatar
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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, ...
Jacques's user avatar
1 vote
2 answers
115 views

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’...
Tina J's user avatar
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1 vote
1 answer
60 views

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 ...
SM5's user avatar
  • 9
2 votes
1 answer
411 views

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 ...
Craig MS's user avatar
2 votes
2 answers
102 views

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 ...
Federico Andrea Fusco's user avatar
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1 answer
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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 ...
Unai Granados Ormaetxea's user avatar
1 vote
1 answer
135 views

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
Haris Khan's user avatar
1 vote
2 answers
369 views

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 ...
Shruti Chakraborty's user avatar
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2 answers
2k views

[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 ...
Cyclical Obsessive's user avatar
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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 ...
Avv's user avatar
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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 ...
Macedon971's user avatar
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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 $X$. ...
Chen OT's user avatar
  • 101
1 vote
2 answers
116 views

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, ...
astabc44's user avatar
1 vote
1 answer
217 views

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 ...
Lisa9892's user avatar
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1 answer
100 views

How to find the camera matrix and distortion matrix from the given data

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Amit's user avatar
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0 answers
293 views

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 ...
Kaapeine's user avatar
0 votes
2 answers
335 views

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 ...
Gabe's user avatar
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2 answers
486 views

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-...
Muhammad Shahbaz's user avatar
1 vote
0 answers
91 views

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 ...
FourierFlux's user avatar
0 votes
1 answer
205 views

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 ...
Samba's user avatar
  • 1
0 votes
0 answers
20 views

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 ...
user60108's user avatar
  • 101
1 vote
1 answer
313 views

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 ...
Guillermo Guardastagno's user avatar
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0 answers
146 views

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 ...
Diwakar Manickavelu's user avatar
1 vote
2 answers
116 views

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 ...
Splinter1984's user avatar
0 votes
2 answers
1k views

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 ...
qwertyuiop's user avatar
1 vote
1 answer
99 views

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 ...
mkr's user avatar
  • 11
1 vote
0 answers
163 views

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 ...
user3234005's user avatar
0 votes
1 answer
267 views

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 ...
DragonflyRobotics's user avatar
1 vote
1 answer
595 views

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 ...
DragonflyRobotics's user avatar
0 votes
3 answers
1k views

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 ...
DragonflyRobotics's user avatar
2 votes
1 answer
710 views

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 ...
sci9's user avatar
  • 189
0 votes
1 answer
45 views

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 ...
Steve Ahlswede's user avatar
1 vote
2 answers
546 views

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 ...
OlorinIstari's user avatar
0 votes
1 answer
209 views

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 ...
saran pn's user avatar
0 votes
1 answer
18 views

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 ...
Azmyin Md. Kamal's user avatar
1 vote
2 answers
185 views

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?...
Mona Jalal's user avatar
1 vote
2 answers
97 views

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 ...
Nathan Boyd's user avatar
1 vote
0 answers
101 views

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)...
Rexcirus's user avatar
  • 248
0 votes
1 answer
213 views

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 ...
Raj's user avatar
  • 15
1 vote
0 answers
2k views

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 ...
lzx071021's user avatar
1 vote
1 answer
52 views

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 ...
Zabir Al Nazi's user avatar
0 votes
1 answer
396 views

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 ...
Vinitha Patil's user avatar
1 vote
1 answer
63 views

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?
Smriti Mishra's user avatar
1 vote
0 answers
413 views

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 & ...
Ahmed Essam El Fakharany's user avatar