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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45 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 ...
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1answer
196 views

Extrinsic calibration of a multicamera-rig mounted rigidly on a mobile robot

We have a set of 8 cameras mounted rigidly on a mobile robot. The cameras are forming an arc, which allows a 360º vision. I want the extrinsic parameters of them referred to the robot. Is there any ...
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11 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 ...
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1answer
1k views

Poor accuracy of hand eye calibration when using vanilla Tsai's method

I’m working on the hand eye calibration for the robotic arm. I attached the camera near the tip of the robot (or end effector) and took around 40 pictures of an asymmetric circles pattern. I ...
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1answer
195 views

How to do IMU and camera "sensor fusion" tracking?

I have some 50ms latency cameras at hand and a 800Hz IMU (gyro+accelerometer+magnetometer). I would like to know how exactly how I should do a sensor fusion of such an IMU and camera to fix the ...
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51 views

Which algorithms to locate a static 3D object relative to a moving camera/IMU?

I am using typical setup with camera and IMU as found on a smartphone. Using this, I would like to estimate the relative pose between the camera and an object (for simplicity, let's say a cube). The ...
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2answers
81 views

Collaboration of mobile robot and survaillance camera - classic localization (still) needed?

Just started with the topic of mobile robotics.. so I'm still into concept making and little programming, but have not setup everything or tested at all. I got a (differential) mobile robot (lego ...
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2answers
33 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 ...
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1answer
101 views

How to get a wired live feed from camera to phone

I need a clear video live feed from a camera to an android phone. The connection does not have to be wireless because i have to use it without any internet. The camera and phone will be 2 or 3 meters ...
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1answer
135 views

Extrinsic Calibration Target Depth Camera

What's a good calibration object for the extrinsic calibration (rotation + translation) of a depth camera (no color sensor, only depth)? With RGB, people seem to typically use chessboard pattern or ...
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2answers
150 views

Vısual sensor.camera lenses with a field of view of more than 180 degree

What kind of camera models can be used for lenses with a field of view of more than 180 degree ? Is ıt possible if not why? Are fisheye lenses suitable for this purpose?
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2answers
62 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 ...
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1answer
26 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 ...
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1answer
75 views

Planar Robot Boundary Detection

I am tasked with building a robot that needs to localise and navigate itself on a rectangular surface (like a large desk). The rectangle's shorter sides will be marked with a red tape (or with two ...
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1answer
26 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 ...
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2answers
186 views

Good 3D simulator for outdoor autonomous navigation

What's an appropriate tool for simulating a car driving in a simple closed-loop racetrack? I'm trying to implement the control logic for an autonomous vehicle, and I'd like to be able to first ...
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1answer
16 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 ...
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19 views

Motion Tracking with Arduino Controlled Camera Slider

I have an Arduino-controlled 3-axis camera slider and I'm thinking of implementing a motion tracker that makes the camera move accordingly on the slider. How feasible is this during a 3-month period? (...
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44 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 ...
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50 views

ROS2 Stereo View Fails And Stereo Image Proc Doesn't Show Anything

I have set up 2 Monocular Cameras as a stereo camera in ROS2. I successfully published the 2 rectified and calibrated images through the following formats: ...
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2answers
70 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?...
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1answer
47 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 ...
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3answers
237 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 ...
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0answers
33 views

RGBD Camera Compatibility with ROS

I am looking for a good RGBD Camera that I want to use with ROS. Is there a way to know if a camera will work with ROS? Or is it that every camera is compatible with the usb_cam node? I want to send ...
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0answers
27 views

RealSense Python API: Construct BufData or frame

I need to call rs2_project_color_pixel_to_depth_pixel from Python with synthetic data. The data are generated in Python and do not come directly from the RealSense. ...
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0answers
40 views

Accuracy of monocular visual-inertial odometry

I am currently considering to use monocular visual-inertial odometry (VIO) to localize a smartphone relative to a known object. Now, what I would like to understand is, what kind of accuracy I can ...
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4answers
105 views

Is there a specific way or module I can use to stream video data from a camera hooked to an Arduino Uno board?

I'm currently thinking about the feasibility of creating a robot which streams live video footage and other data such as temperature, humidity, etc. to a smartphone. Is it possible to do this on an ...
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1answer
69 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 ...
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0answers
8 views

Is there any way to know whether the disparity is negative without stereo rectification?

For one stereo camera, stereo calibration is performed to obtain intrinsic and extrinsic parameters during manufacturing. During the process of usage, intrinsic and extrinsic parameters may be changed,...
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2answers
46 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 ...
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1answer
42 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 ...
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1answer
15 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 ...
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0answers
13 views

How to spatially calibrate two FLIR thermal SC8000 cameras?

I have two FLIR SC8000 cameras and I do not know how to spatially calibrate them? I am doing stereo videography of a deformable moving object in a 1mx1m square. I also don't know what angle of these ...
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2answers
40 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 ...
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1answer
124 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 ...
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1answer
105 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 ...
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0answers
20 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)...
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2answers
359 views

IMU in a gimbal system

I have short question about the alexmos gimbal controller. The Controller receives the gyroscope and accelerometer sensor data from the IMU, that is mounted on the camera. In optimal case, the camera ...
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1answer
687 views

How to calculate vehicle detection distance?

I would like to know how to calculate the distance to each car when I run my application for an autonomous vehicle in real-time. In addition, I want to know how to implement the calculation in C++. ...
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0answers
523 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 ...
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4answers
14k views

How to select cameras for a stereo vision system?

I am in the process of building a stereo vision system to be used on a UGV. The system is for a robot that will be used in a competition wherein the robot is teleoperated to find relatively small ...
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1answer
35 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?
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1answer
43 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 ...
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0answers
36 views

Determining Orientation of a Robot Relative to a Line on Table

I am currently busy with a robot that needs to obtain it's orientation relative to a line seen by a camera. At the moment, I am using Hough lines to obtain a gradient for the line, but the gradient ...
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3answers
2k views

Real-time video processing on video feed from a drone's camera

I am working on a project where I want to run some computer vision algorithms (e.g. face recognition) on the live video stream coming from a flying drone. There are many commercial drones out there ...
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0answers
146 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 & ...
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0answers
21 views

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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0answers
23 views

Hint regarding Localization & Map Scaling

I just started with mobile robotics. I'm trying to do a collaborative system between a mobile robot and a ceiling camera (Raspberry). They should do all tasks as a "team". Means Calibration, ...
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35 views

Intel RealSense Depth Camera D435i Wide Imager questions?

I have just ordered my d435i and while it was not intended to do NDVI I read the data sheet and noticed it had seperate image sensors, it is possible to read the IR image from either left, right or ...
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39 views

Use Realsense camera to get the camera image

I have to use LIDAR in my project. I was searching for some LIDARs with a camera and came across the Intel RealSense d400 series. I know it has a camera but please suggest a way to use that camera ...