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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23 votes
4 answers
15k 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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10 votes
5 answers
67k views

How can I send video from my Arduino camera module video to my Android screen?

I'm trying to connect a camera module to my Arduino Mega, connect my Mega to my Android phone (throught BlueTooth or other), and send the live view of the camera to the mobile phone. I saw a video ...
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8 votes
2 answers
108 views

Conceptual problem regarding electronic shutters

I have been looking at CCD and CMOS sensors and cameras to decide which one to use in the process of automatic control of a printing process. By now I am getting the grips on almost all the essential ...
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8 votes
1 answer
505 views

Are time-of-flight cameras like the swissranger affected by outdoor fog?

I'm looking to build an outdoor robot and I need to know if time-of-flight cameras like the SwissRanger™ SR4500 work in fog, does anybody have some experiences on that?
7 votes
2 answers
3k views

Drones and camera streaming

How do you stream video feed from a camera on a drone? I would think that at high altitudes Wi-Fi won't work. So what would you usually do, and how?
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7 votes
7 answers
7k views

What are some low cost alternatives for lidar? [closed]

It need not be as effective as lidar or it may have some disadvantages when compared with lidar. What are the probable alternatives? Edit: I'm intending to use it outdoors for navigation of ...
6 votes
4 answers
14k views

Stabilizing a quadcopter with optical flow

My quad copter can balance itself in the air using data collected from mpu6050. With the sonar sensor, it can hover at a specific height, but it moves on the horizontal plane in a random direction. ...
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6 votes
3 answers
7k views

Camera selection for long range stereo vision system (up to 100 meters)

I want to implement a real-time stereo vision system for long range (up to 100m) depth estimation. I know that there are some general considerations as described in this SOV post. I have seen some ...
6 votes
6 answers
3k views

Low power computer for stereo vision

I would like to build a motorized robot with stereo vision that sends visual input to a PC over wifi for processing. A Raspberry Pi would have been perfect for the task if it would be possible to ...
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6 votes
2 answers
5k views

Question for those who have experience using stereo cameras/module (e.g. ZED, DUO M, Bumblebee, etc.)

This is a question for those of you who have experience using stereo cameras/modules like the ZED, DUO M, Bumblebee cameras, etc. (not TOF cameras). I can't find any sample disparity outputs out there ...
6 votes
1 answer
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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5 votes
1 answer
15k views

what's the difference among rgb-d camera, depth camera, 3d camera, and stereo camera?

I'm very new in this field so my question may be very stupid. I apologize for this at first. I'm trying to use a proper camera to run a SLAM algorithm. As suggested by some people, stereo camera may ...
5 votes
3 answers
7k views

Difference between 3D Camera(using IR projection) and Stereo Camera?

I am currently busy with a final year project which requires me to track people walking through a doorway. I initially thought this may be possible using a normal camera and using some motion ...
5 votes
1 answer
5k views

Transform Image Using Roll-Pitch-Yaw Angles (image rectification)

UPDATE: This exact problem has been solved in StackOverflow. Please read this post there for further explanation and a working solution. Thanks! I am working on an application where I need to rectify ...
5 votes
1 answer
299 views

Can you find object distance using camera pose

I have bounding boxes detected in RGB images, but no information about the camera's intrinsic properties. Using deep learning (preferably) can I find the distance to the object from the camera in real ...
4 votes
2 answers
166 views

Why are two cameras mounted in paralle in stereo application?

For stereo cameras on the market, two cameras are always mounted side by side and with a displacement that is perpendicular to the cameras’ optical axes. I take this setup for granted. One idea came ...
4 votes
2 answers
1k views

Stereo Camera calibration with different camera types

I'm trying to perform stereo camera calibration, rectification and disparity map generation. It's working fine with normal sample data. However, I'm trying to use the dual cameras on an iPhone 7+, ...
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4 votes
2 answers
1k views

Interfacing high-resolution image sensors with ARM Board [closed]

I'm working on a project requiring HD (Stereo) Video Processing. Most of High Resolution (5MP+) Sensors use MIPI-CSI interface. I managed to get a board with an Exynos5 SoC. The SoC Itself has 2 ...
4 votes
1 answer
64 views

How to produce a continuous variation of a discontinuous function?

I have a differential equation that connects the "velocity" of a point in the FOV of a camera with the velocities of a robot's joints, that is $$\dot s=J(s) \dot q$$ where s is a vector with the $x$,$...
4 votes
1 answer
158 views

Simple way of 3d perception

I wonder is there any simple (can be computed in microcontroller level) option which is suitable for 3d object perception (depth, position, pose or coordinate estimation) of flying robots except LIDAR,...
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4 votes
1 answer
1k views

Image registration with ground plane for surround view

I am currently working on a project which which involves surround view. I have 4 fish eye cameras and are fixed at 4 sides of a car.The fish eye cameras are corrected for radial distortion. After ...
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4 votes
1 answer
670 views

Stereo camera vs. one camera for player detection & ball tracking in basketball scenes?

There are a number of similar questions such as Monocular vs. stereo computer vision robustness for object detection, but none that address my question specifically. My weekend project is to build a ...
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4 votes
2 answers
2k views

ROS Calibration Camera Problems

I am trying to calibrate a monocular camera using ROS with the help of this website: How to Calibrate a Monocular Camera. When I run rostopic list, I get: ...
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4 votes
3 answers
4k views

Stream Real-time Video with Environmental Data Overlaid

I want to embed environmental data collected from sensors into a live video stream from a camera. Has anyone done this or know how I would go about doing something like this? Is there a library ...
3 votes
2 answers
4k views

Can I control more than 18 servo motor with a Raspberry Pi

I'm trying to make an hexapod with 18 servo motors and i'm asking how to control them with a Raspberry Pi. (Never used it). I saw lot's of stuff to control 1, but 18, 20... Currently I'm working on ...
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3 votes
3 answers
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 ...
3 votes
2 answers
253 views

I am making a Ping pong-playing robot using two cameras to trace the ball (3D vision),what is the minimum Frame rate of the cameras?

I am making a Ping pong-playing robot, like the one in this video, and i am intending to use two cameras to trace the ball in 3D space. Supposing that the robot is playing against a beginner player, ...
3 votes
2 answers
100 views

Question about Lens distortion

Suppose I have a 240x180 camera with the following distortion co-efficients, $$k_1 = -0.138592767408$$ $$k_2=0.0933736664192$$ $$k_3=0.0$$ $$p_1=k_4=-0.000335586987532$$ $$p_2=k_5=0.000173720158228$$ ...
3 votes
3 answers
7k views

How can I make a motion tracking camera?

I'm looking into CCTV, and am interested in minimising costs by having a motion tracking camera cover an area that would otherwise utilise multiple cameras. There is already something like this on ...
3 votes
1 answer
1k views

Trigger two usb cameras at the same time

I'm studyng stereo cameras, and I want to build one. I searched a lot in internet, and the opinions are quite different about this topic. Basically, my question is: Can I synchronize two usb ...
3 votes
1 answer
1k views

OpenCV get topdown view of planar pattern by using intrinsic and extrinsic from cameraCalibrate

Originally I have a image with a perfect circle grid, denoted as A I add some lens distortion and perspective transformation to it, and it becomes B In camera calibration, A would be my destination ...
3 votes
1 answer
84 views

Syncing camera with other signals

I am not sure if this is the best place to ask this question, but hopefully someone here can give me some advice. I have a device hooked up to a data acquisition system that can provide sync out ...
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3 votes
2 answers
448 views

Ceiling depth with a monocular camera

Having a camera mounted on my robot and looking upwards, I want to estimate the distance of the ceiling as the robot moves and also the position of landmarks observed on the ceiling (lamps for example)...
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3 votes
1 answer
334 views

Short range stereo vision

I am designing a stereo vision system for short depth range (15 cm to 35 cm) and I have some problems about baseline, focal length and depth range. My application is to scan an animal tissue (meat, ...
3 votes
1 answer
154 views

Setting up a Structured Light Stereo system

I am trying to get started with a stereo experiment and wanted to know the mistakes I might have made during the experiment. The goal is to calculate the depth map of an object using one light ...
3 votes
1 answer
639 views

How to eliminate motion blur with realtime performance

I have a robotic system to develop, in first phase of the project I need to track an object. So I placed a geometrical marker on the object to estimate it's pose (rotation, translation). It all works ...
3 votes
1 answer
1k views

Correct Fish eye camera radial distortion and blurry stretch at the image edges

There are a lot of questions regarding this topic, but I am trying to get a more clear picture from these questions. I am trying to calibrate a fish eye camera and I am using OpenCV ...
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3 votes
1 answer
1k views

Scale problem with monocular visual odometry

Is monocular visual odometry able to estimate relative scale? Say I have a sequence of 10 images that are taken on a single track each 1 m after the previous. Can some mono odometry method distinguish ...
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3 votes
1 answer
679 views

Suggestion for a camera [closed]

Are there good low cost cameras that are frequently used in robotics? I am assuming there are cameras that are good fit for robotics ... Works well with OpenCV PC Windows support - USB2/USB3 (GigE, ...
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3 votes
1 answer
86 views

Joint angle correction using LM

I have a camera mounted on a rotational joint. I need to calibrate the extrinsics of this camera. I can fix the camera at an estimated angle (facing the ceiling). Then I want to get the real angle. ...
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3 votes
1 answer
85 views

What different sensing approaches are used in the current batch of indoor 3D cameras?

I'm aware of the PrimeSense camera powering the Kinect. Are more advanced sensor types available now in the < $500 range? For example, has there been any sort of game-changer in structured light ...
3 votes
1 answer
762 views

How can I preserve a high framerate while using at least 1280x720 resolution on 2 USB cameras on the same computer?

To expand on this, I have a down-facing camera using the whycon ROS node on Ubuntu 16.04 Kinetic on a quad-core computer with 640x480@60fps MJPG video. I'm also using the ...
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3 votes
0 answers
46 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 ...
3 votes
1 answer
203 views

Live Streaming video via Arduino with limited space [closed]

I am currently undertaking a competition called CanSat, in which you build a satellite in the form of a standard soda can. It will in turn then be launched 30 meters, 100 meters and then ...
3 votes
0 answers
678 views

real-time stereo vision system for long range (up to 100m) depth estimation

I want to implement a FPGA-based real-time stereo vision system for long range (up to 100m) depth estimation. Also, I want to use two ip cameras in the system. I have calculated depth error using the ...
3 votes
2 answers
140 views

Suggestions on object types (features) to track from ARDrone 2 camera

UPDATE I have aded 50 bounty for this question on the StackOverflow I am trying to implement object tracking from the camera(just one camera, no Z info). Camera has 720*1280 resolution, but I ...
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2 votes
3 answers
901 views

algorithm Simple Stereo Vision

I'm working in a project implementing a vision system. I'm a student and this is the first time I'm doing something like this, it has been a challenge. I'm using a controller (Netduino+2, .Net ...
2 votes
2 answers
157 views

Smart camera image processing on embedded GPU vs. in the cloud

I'm working on a smart camera that does key point prediction (predicting locations of wrists, elbow, shoulder, ears, eyes, nose, etc.) for gesture recognition. Right now, the neural net is running on ...
2 votes
1 answer
2k views

Position vs Image based visual servoing?

Can anyone explain Image based visual servoing for robotic arm through example? I can understand Position based based visual servoing like this, .... there is an object and estimating it 6D Pose ...
2 votes
2 answers
4k views

Using an RGB + Depth Camera to locate X,Y,Z coordinates of a ball

I've recently been trying to use Gazebo to do some modelling for a couple tasks. I have a robot that's effectively able to locate a ball and get x,y coordinates in terms of pixels using a simple RGB ...
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