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.

Filter by
Sorted by
Tagged with
2
votes
0answers
571 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 ...
2
votes
2answers
480 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 ...
6
votes
2answers
174 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
votes
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 ...
0
votes
2answers
578 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 ...
1
vote
1answer
374 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 ...
3
votes
1answer
178 views

Stereo camera baseline not needed for calibration?

I am doing stereo camera calibration as described in this blog post. I wonder I do not need to input camera baseline for the calibration. The fact probably goes back to some very basic mathematics of ...
1
vote
1answer
140 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 ...
3
votes
2answers
894 views

Connect sensors to beaglebone/arduino in a complex robot

I'm building the biggest robot I've ever done. The hardware I have so far is as follows: HCR-Platform from DFRobot as a base x2 12V 146Rpm DC motor with two phase hall encoder x7 Sharp 2Y0A21 IR ...
6
votes
1answer
492 views

Role of Neuromorphic Computing and Quantum Computing in the field of Robotics and AI

I asked a similar kind of question some time ago (Neuromorphic Engineering and Robotics) Since then, many things have come to the point of revelation. A road-map for neuromorphic computing was ...
0
votes
1answer
97 views

How do I get started in Computer Vision? [closed]

I want to know how to write and run the correct code. I understand that I need to download OpenCV (which I have), but when I try to compile sample code - for example, Blob Detection - it doesn't ...
3
votes
0answers
783 views

Alternatives to Primesense depth cameras? [closed]

I'm looking for low-cost depth cameras (less than 1000 USD) with a range of more than 3 meters. Currently, I have found only SoftKinetic DS-311 that meets these requirements. Here are some other ...
4
votes
1answer
3k views

LIDAR solutions [closed]

I am surprised by the price range of Lidar applications considering the simplicity of the design. I try to make a simple project that requires lidar for object recognitions etc. I wouldn't like to use ...
2
votes
1answer
330 views

Maximum angle between the camera pose to correctly estimate homography

I want to capture two views of same scene. The scene consists of a set of objects kept on a table. From the two views, I wish to calculate homography for image matching. I want to know what is the ...
3
votes
5answers
536 views

Using vision for Monte-Carlo localization

From each step of my vision code I am able to get around 400 coordinates of where the robot thinks the walls are I want to integrate this into Monte-Carlo observation step. I'm storing the map of ...
1
vote
3answers
2k views

System for determining occupied seats in an auditorium [closed]

I need an app that can do live monitoring of whether each seat in an auditorium is occupied, so visitors can load the app and see where to sit. The auditorium has a relatively flat ceiling 4m ...
2
votes
1answer
224 views

Workable low-resolution object/target recognition pattern and library?

I've spent quite some time researching this, but most of my Google search results have turned up academic research papers that are interesting but not very practical. I'm working on a target/pattern ...
2
votes
1answer
16k views

How can I interface my CMOS camera module to an Arduino? [closed]

I am totally new to the camera interface and usage in an Embedded project, and would like to use a CMOS vision sensor like this.This project further will be used to power a small robot with on-board ...
5
votes
1answer
4k 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 ...
8
votes
1answer
149 views

Public training data for vehicle detectors in computer vision?

This question is to anyone familiar with object (specifically vehicle) detection research. I'm new to computer vision and am confused about training object detection classifiers. Specifically, the ...
5
votes
1answer
170 views

classify if two adjacent surfaces belong to same object

I have a box (cuboid) lying on floor or table. So there are 6 surfaces of the box and 1 surface of the floor. If I take each pair of surface such that the surfaces are "adjacent" to each other, I get ...
17
votes
4answers
8k 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 ...
3
votes
2answers
164 views

Non-Vision Based Target Tracking

I am building 4-wheeled, knee-high robot with music and speakers on top that will follow a target person as the target moves around. I would like some help with the setup for tracking the target. The ...
3
votes
1answer
917 views

How to obtain stereo correspondences and what exactly is a disparity map?

I am currently reading into the topic of stereo vision, using the book of Hartley&Zimmerman alongside some papers, as I am trying to develop an algorithm capable of creating elevation maps from ...
0
votes
2answers
287 views

How do we make our robot work?

As a holiday project we are building a surveillance robot that is capable of transmitting live images using a webcam and is also capable of lifting small objects. It uses a CC2500 module for ...
18
votes
4answers
12k 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 ...
5
votes
1answer
85 views

Is it possible to achieve arbitrary precision in camera calibration?

Is it possible to achieve arbitrary precision to the calibration of the extrinsic parameters of a camera or is there a minimum error wich can not be compensated (probably dictated by the camera's ...
5
votes
2answers
167 views

How to Identify Objects in Space

Using a depth sensing camera like Kinect, I would like to retrieve the position of an predetermined object (e.g. a cup, fork etc so that I would ultimately be able to grab the object). What would be a ...
6
votes
3answers
222 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 ...
12
votes
4answers
4k views

How to obtain dense point clouds from stereo cameras?

I am trying to use a stereo camera for scene reconstruction, but I can usually only obtain sparse point clouds (i.e. over half the image does not have any proper depth information). I realize that ...
6
votes
3answers
970 views

Visual Odometry options? [closed]

What are the pros/cons of the different visual odometry options? Stereo Camera Optical Flow SLAM other? Criteria: how well it performs vs other odometry options/sensors (lidar, radar) sensor ...
8
votes
2answers
174 views

Floor Segmentation to Determine Navigable Paths

In my application, my robot has the following physical setup: Differential drive mechanics with feedback (wheel encoders) Commercially available webcam mounted with a known transform to the base of ...
5
votes
3answers
198 views

F/OSS Optical Object Avoidance

I am beginning work on a larger scale, 250-350 lbs wheeled robot and looking to use both optical and other means of object avoidance. I am concerned with a robot this large causing issues with running ...