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A quadrotor Micro Aerial Vehicle (MAV) is designed to navigate a track using neural network approach to identify the direction of the path from a stream of monocular images received from a downward-facing camera mounted on the vehicle. Current autonomous MAVs mainly employ computer vision techniques based on image processing and feature tracking for vision-based navigation tasks. It requires expensive...
In the recent years', image processing is becoming an important field in computer science. Also, interaction between human and computer is in increasing rate. Nowadays image processing used in many application for example application like measuring the distance between systems that consist of a camera and objects around the system using Stereo vision. Some previous studies use pixel by pixel search...
Due to its advantageous features (eye protection, low energy consumption and capability of being read under any lighting-conditions), Electrophoretic displays (EPD) have been rapidly developed in the past ten years. Different types or production batches of EPD films need different driving waveforms; even in the same device, different driving waveforms are required under different environments to guarantee...
This paper presents a robust and important method for the self-calibration of a numerical camera using a tridimensional unknown scene. The particularity of our technique resides in the use of an arc of the circle and the localization of some of the matching points detected in the use of an ensemble of images in order to define in an automated way the intrinsic parameters, which are unknown and variable...
Dimensions like the length and breadth of an object can be useful in the field of Human Computer Interaction (HCI) for applications such as Augmented Reality. Moreover, digitally measuring the length and breadth of an object can save the tediousness of performing many day-to-day activities like geometrical calculations involving real life objects. In this paper, we talk about finding the length and...
Camera calibration is a fundamental problem in computer vision community. Already extensive research has been conducted and emerge a large number of excellent calibration algorithm, but there is few studies of automatic calibration system, the camera calibration toolbox for the moment almost use multi-use manual or semi-automatic marking the target area and extracting feature points, inefficient and...
In this paper we present a method for prediction and trajectory tracking of a set of vehicles operating in a port. The objective is to enable the prediction of risk situations in order to avoid collisions. The system is designed for high traffic areas located in ports or civil engineering projects, environments in which traffic occurs without structured lanes of movement. While many studies have been...
Camera calibration technique has important research and application value in the field of computer vision, and its precision directly affects the three-dimensional reconstruction effect. This paper elaborated the principles of the existing camera calibration methods: traditional camera calibration method, camera self-calibration method, and camera calibration method Based on active vision, and analyzed...
Depth from Defocus (DfD) is an effective method to infer the depth information of a scene. This technique requires a focused and defocused image of the same scene. The state of the art DfD literature uses an energy function optimization method based on the Markov Random Field model with Maximum a Posteriori statistics (MRF-MAP). Typically this energy function consists of two terms: first, the absolute...
Birds inhabiting an airport are recognized as a risk factor to aviation safety. Even though several methods and equipment has been contrived for the bird expellant, their effectiveness and durability are limited. In this paper, we present a semi-autonomous unmanned ground vehicle as a bird expellant in an air port. The designed UGV has three mounted laser range finders, four video cameras, and a digital...
this paper proposes a algorithm to generate the panoramic view from 360 ¡ãfisheye images based on angular fisheye projection model. Firstly, the image plane will be mapped to the view plane, the sphere plane, to obtain the coordinates of spherical points. Then use the angular fisheye projection model to get fisheye images' radius. Secondly, calculate the coordinates of fisheye images' points with...
A visual interface system that recognizes handwriting of Japanese katakana characters in the air has been developed. Characters written in a single stroke have both on-strokes and off-strokes. Thus, the shapes of the hand-gesture characters are different from the shapes of characters written on paper. It is difficult to trace the shapes of characters in air because the writer cannot see the trajectories...
A new non-contact method for detecting the flatness of hot rolling strip, which is based on laser, CCD and digital image processing technology is presented. This new method projects linear lasers to the strip at some angle between 20 degree to 30 degree from the length and width direction of strip to become the latitudinal and longitudinal lines, and then uses one or several cameras to pick images...
The new concept of reprogrammable digital circuit implementation for auto-guiding system is shown in this paper. It is dedicated to astrophotography and operates with popular CCD Webcam and ST4 compatible equatorial mounts. This idea was verified by MATLAB model, which was used to test all procedures and data conversions. Next the circuit prototype was implemented at Altera MAX II CPLD device and...
In this article, 3-D image acquisition for high-speed machine vision using Fourier transform profilometry (FTP) with digital tilting-fringe projection is presented. FTP employing tilting-fringe patterns is proposed to achieve real-time 3-D machine vision. To achieve this, the mathematical modeling of FTP with tilting-fringe projection is presented and the critical condition for measuring maximum surface...
In 3D computer graphics, it has been an important issue to describe a virtual object realistically and show it in a physically correct manner. Unlike the virtual reality(VR), the augmented reality (AR) is an environment containing virtual and real objects simultaneously. However, the difference in motion between the virtual and real objects is obvious, which makes it hard for AR to be realistic and...
We review some recent techniques for 3D tracking and occlusion handling for computer vision-based augmented reality. We discuss what their limits for real applications are, and why object recognition techniques are certainly the key to further improvements.
Advances in Internet connections speeds and computer hardware means that web content has grown richer and more interactive for users. One such area is Web3D which has seen the emergence of ISO standard technologies such as VRML (Virtual Reality Modeling Language) and its XML-based (eXtensible Markup Language) successor X3D(eXtensible 3D). X3D, in particular, presents opportunities for further integration...
There are two steps in using 3D computer vision to extract metric information from 2D images. Camera calibration is the first step, and this paper analyses and compares the three popular calibration methods: typical linear calibration, Tsaipsilas two-stage calibration and Zhangpsilas planar pattern calibration by measuring the position of space points. It is concluded that Zhangpsilas method has the...
This paper presents an eye-gaze tracking system based on the image processing. All the computations are performed in software and the system just needs a PC camera attached to the user's computer. We first extract the facial regions form the images using the skin-color model and connected-component analysis. Then the eye regions are detected by employing the rules and area segmentation. After the...
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