Questions tagged [opencv]

OpenCV (Open Source Computer Vision) is a cross-platform library of programming functions for real time computer vision.

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I get an error when I try to install ROS on VMware fusion 12 pro

I'm trying to install ROS on my VMware fusion 12, but after updating the bash file as per the installation document, I get an error when I enter roscore in the terminal. The error seems to be that my ...
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49 views

Triangulation: Ceres solver minimizes only the last residual block

I have been attempting to estimate a bunch of 3d coordinates viewed via a multi-view setup with known poses, I have the code running, but the output of ceres seems baffling. There are 7 image frames/...
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Point of origin in stereo-calibration OpenCV?

I set up a stereo-vision system to triangulate 3D point given two 2D points from 2 views (corresponding to the same point.) I have some questions on the interpretability of the results. So the size ...
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OpenCV4.2 and Ubuntu16.04 with python2.7?

Summary: I'm using new vision of opencv, opencv 4.2 with ubuntu 16.04 and python 2.7 After built cv_bridge, the output is: ...
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Bundle Adjustment for Monocular SLAM

I am confused with how monocular BA works in visual-based SLAM. Is there any tutorials I can do in openCV to provide me some visualization aid? Thank You.
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49 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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Interpreting results from Camera Calibration?

I used OpenCV's findChessboardCorners on a few checkerboard images (40~) and about 27 seemed to find the corners accurately. How does one proceed from here? Do I calculate the reprojection error over ...
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79 views

Visual-Positioning Method

I'm working on mobile manipulator and trying to do visual-positioning of the end-effector. My camera will located around 1-2 meters from the robot. I'm sure i cant use color tracking method because ...
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1answer
55 views

Make robot drive as far from obstacles as possible

I am trying to make robot drive around the room, avoiding obstacles with pathfinding. The problem is I get few waypoints from pathfinding algorithm for robot to drive to (green dots), but it drive a ...
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69 views

How do I use the live video stream from my arduino camera (connected by serial), to run with my OpenCV python ball tracking code?

My objective is to have the arduino camera, just to act like a webcam, and have my laptop run a ball tracking script on it. The ball tracking script already works with my laptops camera, and it can ...
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1answer
62 views

Path planning or 2D Mapping

i want to collect some ideas about this video. https://www.youtube.com/watch?v=q-ZDB8xqI7M Is the Left Vacuum cleaner using some 2D Mapping or OpenCV to navigate through the room ? Or is it just a ...
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116 views

Algorithm for centering an object that is changing speed

I'm trying to use a pan / tilt alt-azimuth telescope mount to track an object that is moving in the sky. The problem is that the object is changing speed constantly. I can easily track objects that ...
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57 views

Image data fusion

I have three cameras separated by some distance, looking at a scene. I have calibrated them using checkerboard and I have their respective intrinsic parameters and their pose and rotation matrix, I am ...
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462 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 ...
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Fixing robot orientation using AR

I am creating a project where a robot needs to face a control panel and do some specific tasks. Some reference tags will be placed on the panel. I want to use the tags as AR reference and fix my ...
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1answer
77 views

How to tringulate many projections of a point to optimal postion?

Suppose we have many images for the same scene (with known poses already,using for ex: a GPS ), and the same feature appear in more than 2 images . How to use all the available info to compute as ...
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1answer
106 views

Robotic Hand Grasp Planning - How do I find the initial contact point for each finger when grasping an object?

I am trying to design a robotic hand that is able to adaptively grasp unfamiliar objects. I am initially thinking that using OpenCV for pose estimation might make doing so easier. Assuming that I am ...
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354 views

Pictures coordinates to robot coordinates

I have a picture on my C# software and the corresponding object in real world on 2d plane of motorized XY axis table. What I want is when I select a pixel on my picture, the motorized table should be ...
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620 views

How to make a line following algortihm for an A.R Drone 2.0? [closed]

I am trying to develop a line following algorithm where a drone will detect a bounding box and follow what is inside the bounding box. I am filtering all the colors to only see the color white. Once ...
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1answer
6k views

Determine the relative camera pose given two RGB camera frames in openCV-python

I would like to determine the relative camera pose given two RGB camera frames. I assume there's overlap in field of view between the two cameras, what I am looking for ultimately is the rotation and ...
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624 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 ...
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103 views

Drone Feedback: Object Detection / Color Detection [closed]

I have been working on a code where an A.R Drone 2.0 will detect color and put a red dot in the middle of the image. I am using streaming for the drone. The goal is for the drone to detect a white ...
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2answers
777 views

Scan an Auditorium, Count People, and Display Open Seats [closed]

I'm looking for any recommended approaches to be able to digitally process a room full people, like an auditorium or a movie theater and output the following information: How many people are in the ...
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1answer
487 views

Tracking a ball returning its x,y,z coordinates [closed]

I'm a Mechatronics Student Engineer, and still new with the computer vision field and am now working on a project that needs to Tracks a small ball and need to determine it's (x,y,z). 1st) Kinect was ...
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1answer
509 views

Mobile robot pose estimation

I want to plot the path of a vehicle via the estimation of egomotion based on essential matrix. Everything was fine with openCV and the following function. ...
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273 views

Maintaining scale factor for essential matrix

I want to recover the trajectory of a vehicle using a monocular camera via the computation of the essential matrix between t-1 and ...
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Are homogeneous coordinates represented by appending image coordinates with a 1 in camera imaging

In camera imaging, there are several terms for point coordinates. World coordinates: [X, Y, Z] in physical unit Image coordinates: [u, v] in pixel. Do these coordinates become homogeneous ...
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4k views

normalized point coordinates in undistortPoints function

In undistortPoints function from OpenCV, the documentations says that http://docs.opencv.org/2.4/modules/imgproc/doc/geometric_transformations.html#undistortpoints where undistort() is an ...
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2k views

Which is the best visual fiducial marker (2D barcode)?

Which is the best visual fiducial marker (2D barcode) for detection and robust and accurate pose estimation? Im not looking for a fiducial marker which can store lot of information. The main goal is ...
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1answer
809 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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436 views

Obstacle avoiding by Pi camera [closed]

I designed a mobile robot with my colleagues for our graduation project, the purpose of it is to detect mines (metals) in a specific area We are programming the robot using Python on Raspberry Pi 3 ...
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1answer
2k views

Converting Image Coordinates to (x, y) Position for Robotic Arm

I have a Robotic Arm with a camera mounted above it looking down at a slight angle. Assuming I know the height of the camera, the angle of tilt and the small distance from the center of the robot ...
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1answer
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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1answer
179 views

Google's 'Tango' - How it works and what's special about the hardware?

I'm looking for a good breakdown and explanation of Google's 'Tango' AR platform. Specifically how the hardware works together to generate depth maps and the SDK's use of it. I know the hardware ...
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1answer
801 views

How to check lane departure in OpenCV?

I'm using OpenCV 3 in Python 2.7 on a Raspberry Pi 3. My project's aim is to build an autonomous lane departing robot that can detect the two lanes on its sides and continuously correct itself to ...
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1answer
403 views

detect post-it from an image of a visual management Board [closed]

'm trying to detect all the post-it in an image and get them into an arrayList. I tried many alternatives (removing backgroud -> detecting contours, haar Cascade classifier, detecting rectangular ...
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2answers
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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2answers
936 views

Transforming Point Cloud to get Top Down Image [closed]

My task: I have a task where I am asked to track parcels(carton boxes) of different dimensions moving on a conveyor. I am using Asus Xtion pro camera mounted on top of a conveyor in any inclined ...
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1answer
233 views

Save Depth Map Video

I have recently purchased an Orbbec Astra camera, which uses the same technology and produces the same style depth map as a Microsoft Kinect. What would be the correct file format to save the depth ...
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1k views

CompressedImage to an Image in a node

Update Hey I have the following subscriber on Nvidia TX1 board running on an agricultural robot. we have the following issue with subscribing to Sensor_msgs::Compressed: ...
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1answer
1k views

Stereo Vision Using Compute Module: Pi camera synchronization

Good day, I am currently working on an obstacle avoiding UAV using stereo vision to obtain depth maps. I noticed that the quadcopter would sometimes not steer to the correct direction. I am using ...
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2answers
277 views

Real-time object classification for an indoor autonomous quad-rotor

I am designing an indoor autonomous drone. I am currently writing an object classification program in OpenCV for this purpose. My objects of interests for classification are: ceiling fans; AC units; ...
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2answers
131 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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2answers
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Tracking objects from camera; PID controlling; Parrot AR Drone 2

I am working on a project where I should perform object tracking using the camera of Parrot AR Drone 2.0. So the main idea is, a drone should be able to identify a specified colour and then follow it ...
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1answer
453 views

what's confidence level? and how can we use it for vehicle detection using OpenCV?

I'm working on project for the Autonomous vehicle, and i want to know what's confidence level means and how can we use confidence level for vehicle detection in OpenCV ?