Questions tagged [computer-vision]

The goal of computer vision is an automatic extraction of information out of images. It includes methods for acquiring, processing, analyzing, and understanding images and high-dimensional data from the real world in order to produce numerical or symbolic information, e.g., in the forms of decisions. The image data can take many forms, such as video sequences, views from multiple cameras, or multi-dimensional data from a medical scanner.

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2answers
109 views

Dynamically detect changing obstacles

So the idea is that there would be one robot acting as overwatch, which would detect all of the obstacles in an area (which are not necessarily static), and then send the data about the obstacles' ...
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1answer
59 views

Is it possible to detect road surface or navigation area using LRF data or other laser data in a Park?

I would like to detect road surface in a park. In the park, only small grass are covered with the both side of the road. That means there is road and the both side of the road are covered by small ...
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7answers
6k views

Why people use camera instead of laser sensor for robot navigation?

I am working on Robot localization and navigation in urban environments. I want to use Camera. But I am a little bit confused about LRF data or other laser data. Why people want to use camera? why ...
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1answer
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Are there any advantages to using a LIDAR for SLAM vs a standard RGB camera?

I've been thinking about building a small UAV with an onboard LIDAR, just for fun. I'm interested in SLAM and autonomous flight indoors and thought that I would need a lidar to get a 3D map of the ...
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3answers
74 views

Is it a bad-design decision to implement high number of moving parts in an automation-robot?

I'm currently designing an autonomous robotic system to manipulate clothes using computer vision and complex moving hardware. My current design incorporates quite a number of moving parts. My biggest ...
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2answers
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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 ...
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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
638 views

how to plot a line between two centroids in matlab

I am able to locate centroids of each blocks, but i am unable to join two blocks with a line segment by avoiding the obstacle as shown in the figure. Please need help how do i achieve this using ...
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1answer
2k views

Perspective n Point - RPnP algorithm

I need to caculate the pose of a camera using an image of an artificial landmkark. For this porpouse I am trying to use the Perspective n Point approach so I can calculate it using the intrinsic ...
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0answers
318 views

Triangulation from calibrated stereo rig

I am using a stereo rig to do SLAM, calibrated using the MATLAB Calibration Tool. I need to compute the 2D coordinates of a landmark using the observation model obtained from triangulation (the images ...
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1answer
371 views

Autonomous Indoor Positioning System Robot based on CV approach

I have some questions regarding an IPS autonomous robot system, Configuration: Mounting a camera to the ceiling of a room Assume the room is a cube of 5mx5mx5m (LxWxH) Assume the camera is ...
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4answers
9k views

Single camera vision and mapping system

Some time ago I saw a demo of a small 'toy tank' with a single camera mounted on it. This tank was able to drive around the floor and detect objects and then move/steer to avoid them. The interesting ...
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0answers
131 views

Starting out, dissertation project using computer controlled drone [closed]

For my final year in Computer Science university I will be doing a dissertation that includes controlling a drone through computer and communication with an onboard camera for computer vision. The ...
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3answers
136 views

Vision-based Position Estimation for a quadrotor

As a subtask inside a main project I need to compute the position (x,y,z) of a quadrotor using an homography. To do this I will use a camera (attached to the quadrotor) pointing down to an ...
2
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1answer
465 views

How does one calculate distance and angle using a target with known measurements?

The target is in the shape of a U where the horizontal segment is 20 inches, and the two vertical segments are 14 inches. We are using a camera to image the target, and then using vision processing to ...
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0answers
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Is the distortion introduced by a lens protector significant in practice?

I have a computer-vision application I made to localize a robot in a room; the software has been in use for a while and is working fine. When I calibrated the camera and got the intrinsics and lens ...
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1answer
122 views

How to estimate the position of multiple static ground targets captured from a down facing camera?

An aerial vehicle captures images of the ground using its down facing camera. From the images, multiple targets are converted from their pixel position to the camera reference frame using the pinhole ...
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2answers
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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0answers
81 views

choice for camera sensor to be used with LiDAR [closed]

I am doing research on autonomous car and looking for a sensor to be used along with LiDAR laser scanner. Ladybug could be a very good option but the cost!! too expensive. Could you please suggest me ...
3
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1answer
334 views

image processing

I am making a Robot goalie, the robot is supposed to detect whether a ball has been thrown in its direction , sense the direction of the ball and then stop it from entering the goal post. A webcam ...
2
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1answer
69 views

“Ambiguous up to scale” , Explanation required

I am reading "Computer Vision: Models, Learning, and Inference" in which author writes at several points (like on page 428-429) that although matrix A seems to have 'n' degree of freedom but since it ...
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1answer
6k views

How can I recognize animals in a video stream or static images with openCV or other library/software?

I'm a software developer not experienced in AI or machine learning, but I'm now interested in developing this kind of software. I want to develop software that recognizes some specific objects, ...
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1answer
1k views

Is it possible to simulate vision (perception) in Gazebo (or other simulators)

Vision is important part of robotics and frequently it is unavoidable component of control loop. E.g. many clothes/garment handling algorithms rely on visual cues in deciding how to proceed. The ...
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1answer
298 views

Pose estimation, how to populate set of known edges and points?

I am building an estimator that solves for the camera pose relative to a reference frame which contains a known set of features and edges. Currently, the system works with an unscented kalman filter ...
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2answers
104 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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1answer
185 views

Tried Normal Distributions Transform with my own files (in correct PCD format) and it throws errors, why?

http://pointclouds.org/documentation/tutorials/normal_distributions_transform.php#normal-distributions-transform I've used this program with the sample PCD's given and it came out correctly. This was ...
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1answer
68 views

Compound vision system or Megapixel camera reduction

Are any commercially available compound vision sensors available? Not a simple 8 sensor system using photo-diodes but a genuine sensor that can provide a >32x32 compound matrix. Would some form of ...
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1answer
94 views

3D scanner from Phone Camera

123D software can construct a 3D model from photos taken from your phone. It doesn't process the photos in your phone. Instead, it sends them to the cloud to create 3d model. How can i construct a 3d ...
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4answers
867 views

What is the cheapest way to detect and identify vehicles entering a gate in real time?

I want to detect and identify each of the vehicles passing through a gate. I have the live video feed of the gate which I initially thought to process and detect the number plates with the help of ...
3
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1answer
669 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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2answers
4k views

Fast C++ library for stereo vision/disparity computation [closed]

I am looking for a library for disparity map / stereo vision computation. These are my requirements: C++ Multi-platform (Linux, Windows, OSX) (preferrable but not mandatory) not CUDA based Suited for ...
7
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2answers
7k views

Questions regarding 3D scanning and camera choice [closed]

A few days ago, I just shared my concerns about the price of computer vision hardware on this same exact forum (see What main factors/features explain the high price of most industrial computer vision ...
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0answers
55 views

Depth of view for a hypercatadioptric camera

I am trying to determine the depth of view for a hypercatadioptric camera (camera lens system and a hyperbolic mirror) based on 1. The following illustration seems pretty clear. For an image point $...
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3answers
3k views

What main factors/features explain the high price of most industrial computer vision hardware?

I am a student who is currently working on a computer science project that will require soon computer vision and more specifically stereoscopy (for close depth detection). I am now looking for a great ...
5
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1answer
4k views

Monocular vs. stereo computer vision robustness for object detection

Are there some genaral rules for the robustness between monocular and stereo vision when considering object detection? I am especially interested in the automotive field - considering distance/...
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4answers
384 views

How many methods can I use to acquire depth data?

I am a newbie in Robotics. As far as I know, there're generally two ways to acquire depth information of a scene. One is the stereo vision method which applies two cameras. The other is the RGBD ...
3
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1answer
516 views

Robot Navigation Feedback using Image Processing

In my project, I've successfully analyzed the arena and have detected the obstacles using an overhead webcam. I also have computed the shortest path. The path data is transmitted to the robot via ...
1
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1answer
316 views

kinect - development kit to aid obstacle-avoiding robot?

Some friends and I are interested in working on a robot. I know little to nothing about robotics, but do have a lot of experience with programming. Before we start, I am hoping that I can find some ...
2
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2answers
709 views

Find Centre Of Circle, when robot can “see” a partial arc

I originally asked this here but I am struggling to take the concepts, particularly "Circumcenter", discussed there and apply it in my context. So here it is in my context... I have a small robot ...
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1answer
170 views

I am new in robotics…I want to know about SLAM algorithm…How should I proceed? [closed]

Please give me guidance how should I proceed to know about SLAM algorithm? I am following some youtube videos but those are not so much helpful for me.....
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3answers
508 views

Real time operating system for robotics vision

I have robot vision system which consists of conveyor with encoder, two cameras (gigabit eth and usb) and simple illuminator. I need to trigger cameras and illuminator when encoder reaches position ...
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0answers
198 views

How to change the orientation of an object w.r.t a scene?

I am trying to localize an object in a point cloud using ROS, PCL. For that I capture the scene and model using Asus xtion pro sensor. I use RGBDSLAMv2 for capturing the model. Then I use ICP (...
6
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3answers
225 views

How can computer vision distinguish one object being contained by another vs being on top of it?

How do we know that an object is contained inside another object or is just lying on top of it? Lets take an example of a cup-plate-spoon. The cup is lying on top of the plate. But the spoon is ...
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1answer
690 views

tracking robot in a room

I'm trying to track a simple robot (e.g. arduino, raspberry pi, even toys) in a room using fixed location kinect sensor(s) and cameras at different parts of the room. How might one usually use to do ...
2
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2answers
76 views

Image processing in bright lights

We are working on a project which requires us to detect and hit a ball. We are trying to accomplish the task by detecting the position of ball by processing the input from a camera. The problem is ...
2
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0answers
594 views

Correcting GPS track with visual odometry (sensor fusion)

I am trying to build low cost and precise outdoor positioning. I explored NS-RAW with RTKLIB - this would be doable but probably will need either a base station to get the correction data for rover or ...
6
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2answers
182 views

computer vision using the FREAK local features descriptor - why overlapping fields?

I am currently studying the FREAK descriptor and I read the article published by its designers. It states that the aim was to mimic the retinal topology, and one of the advantages that could be gained ...
2
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2answers
566 views

image size vs image resolution

I read somewhere that in the case of photoshop for example, the size refers to the number of pixels an image contains, but resolution involves the pixel's size, I don't know whether this definition ...
2
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1answer
1k views

Machine Vision vs Computer Vision?

I'm trying to understand the core differences between the two topics. Is one simply a newer term? Connotations of automobile vs automation? Something with a screen vs without? I've only ever heard ...
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1answer
386 views

Are stereo camera calibration data standardized?

Is there a standard format of how stereo calibration data (various matrices, usually saved in XML) are stored? Can I load calibration data generated say from a OpenCV script in C to another OpenCV ...