Object tracking with range gated camera system

Download
2015
Yağcıoğlu, Mustafa
Imaging systems can be categorized as active or passive. Passive systems act only as a receiver and do not send any energy to their environment. Frequently used night vision systems such as thermal imagers and image intensifier systems are examples of passive systems. Active imaging systems on the other hand, send energy to their environment and detect the reflected energy from the objects. While passive systems require some ambient light or object radiation, active imaging systems can work without any external light source. Range-gated imaging systems are active systems that use a high-power pulsed-light source and control the opening and closing times of the camera shutter in conjunction with the light source. By calculating the arrival time of the reflected light from the object, the camera shutter is opened for a short time period to form an image using the returned light. This allows generating high contrast images of the objects in difficult lighting conditions. To track an object with a range-gated system, beside the horizontal and vertical position of the object, the distance of the object should also be tracked. The distance information is used to arrange shutter timing of the camera. In this thesis, a range-gated camera system test bed was constructed and a robust object tracking algorithm integrated with this system was developed. The distance of the object is calculated by the proposed algorithm with various image comparison methods and the performances of comparison methods are compared.

Suggestions

OBJECT RECOGNITION AND LOCALIZATION WITH ULTRASONIC-SCANNING
KIRAGI, H; Ersak, Aydın (1994-04-14)
In this paper an object recognition and localization system based on ultrasonic range imaging to be used in optically opaque environments is introduced. The system is especially designed for robotics applications. The ultrasonic image is acquired by scanning ultrasonic transducers in two dimensions above the area where objects are located. The features that are used for recognition and localization processes are extracted from the outermost boundaries of the objects present in the input scene. Experimental ...
Measurement of AC magnetic field distribution using magnetic resonance imaging
Ider, YZ; Muftuler, LT (1997-10-01)
Electric currents are applied to body in numerous applications in medicine such as electrical impedance tomography, cardiac defibrillation, electrocautery, and physiotherapy. If the magnetic field within a region is measured, the currents generating these fields can be calculated using the curl operator. In this study, magnetic fields generated within a phantom by currents passing through an external wire is measured using a magnetic resonance imaging (MRI) system, A pulse sequence that is originally design...
Photoluminescence specroscopy of CdS and GaSe
Seyhan, Ayşe; Turan, Raşit; Department of Physics (2003)
With the use of photoluminescence (PL) spectroscopy one can able to get a great deal of information about electronic structure and optical processes in semiconductors by the aid of optical characterization. Among various compound semiconductors, Cadmium Sulfide (CdS) and Gallium Selenide (GaSe) are interesting materials for their PL emissions. Particularly, due to its strong anisotropy, investigation of GaSe necessitates new experimental approaches to the PL technique. We have designed, fabricated and used ...
Super-Resolution Image Reconstruction Applied to an Active Millimeter Wave Imaging System based on Compressive Sensing
Alkus, Umit; Ermeydan, Esra Sengun; ŞAHİN, ASAF BEHZAT; ÇANKAYA, İLYAS; Altan, Hakan (2017-09-11)
The development of passive and active millimeter wave imaging systems is progressing rapidly fueled by the need for many applications in the area of security and defense. Imaging schemes that may either utilize array detectors or single detectors in scan architectures offer suffer from poor resolution due to the longer wavelengths used and the limits of the optical system in terms of lens and mirror dimensions. In order to overcome this limit, super-resolution techniques can be employed to enhance the resol...
SWARM-based data delivery in Social Internet of Things
Hasan, Mohammed Zaki; Al-Turjman, Fadi (Elsevier BV, 2019-03-01)
Social Internet of Things (SIoTs) refers to the rapidly growing network of connected objects and people that are able to collect and exchange data using embedded sensors. To guarantee the connectivity among these objects and people, fault tolerance routing has to be significantly considered. In this paper, we propose a bio-inspired particle multi-swarm optimization (PMSO) routing algorithm to construct, recover and select k-disjoint paths that tolerates the failure while satisfying quality of service (QoS) ...
Citation Formats
M. Yağcıoğlu, “Object tracking with range gated camera system,” Ph.D. - Doctoral Program, Middle East Technical University, 2015.