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In this paper, the information acquisition problem of columnar moving obstacles is investigated for a quadrotor equipped with a stereo vision system flying in an indoor GPS-denied environment. A acquisition algorithm based on stereo vision is proposed to obtain the position and velocity direction. The spatial position relation between the quadrotor and the object detected is used to remove the interferences...
Exchange of image information is one of the main features of a camera network. In order to exchange a large amount of information, a platform with good communication speed is needed. In this study, we designed and implemented a specialized camera network platform using Wi-Fi Direct devices. This platform can provide various services to other devices within the same network. We designed the platform...
Even in state-of-the-art processors, real-time processing of stereo pairs to generate useful scene information is too computationally intensive to process high resolution images and the large disparity ranges necessary for precise depth information. We have implemented the symmetric dynamic programming stereo (SPDS) algorithm in reconfigurable hardware which is able to generate disparity and occlusion...
Rear camera or other wide-angle camera mounted on vehicle has serious perspective effect which makes driver unable to feel distance correctly and is not helpful for succeeding image analysis. To remove perspective effect, it's necessary to change diagonal view to bird's-eye view. In this paper, a software-hardware cooperative bird's-eye view system is proposed, which can estimates the transformation...
As the number of older Americans increases and many decide to stay in their homes, the need for assistive technologies grows. One such technology is an intelligent system of surveillance cameras. While these systems can provide many services, we attempted to limit ourselves to the evaluation of systems that use cameras to track the locations of objects that may be lost or misplaced within a home....
As background subtraction is a common computer vision task; we analyze the usual pixel-level approach. We develop an efficient adaptive algorithm system based on pixel comparison. Recursive comparison of pixel is used between the present frame and the reference frame. This algorithm is implemented using image processing in MatLAB Environment and we work on making it a real-time applicable tool for...
During the last few years many Advanced Driver Assistant Systems have been developed and a larger number of new car models every year is going to be equipped with these systems. However the product/function scenario lacks of common evaluation methodologies and tools for testing and improving performances of these systems. In this paper a validation methodology and a tool for Traffic Sign Recognition...
This paper describes the hardware and software systems that make up an experimental architecture developed to facilitate teleoperation research for miniature rotorcraft. One objective in developing this platform is to place the minimum required sensors and electronics onboard a miniature helicopter with limited payload. The onboard hardware resources must be sufficient to simplify the teleoperation...
The multi-angle spectro-polarimetric imager (MSPI) is an advanced camera system currently under development at JPL for possible future consideration on a satellite based aerosol-cloud-environment (ACE) interaction study as outlined in the national academies 2007 decadal survey. In an attempt to achieve necessary accuracy of the degree of linear polarization of better than 0.5%, the light in the optical...
Paper deals with frequency analysis and measurement of object beating frequency using image analysis of video sequences for biological and medical purposes. Current methods use hardware photosensitive devices or visual analysis frame after frame what is time consuming process. FFT-based method of frequency measurement brings automation of process, removal of hardware devices, removal of subjective...
Region-of-interest (ROI) determination is very important for video processing and it is desirable to find a simple method to identify the ROI. Along this direction, this paper investigates a user attention model based on visual rhythm analysis for automatic determination of ROI in a video. The visual rhythm, which is an abstraction of a video, is a thumbnail version of a video by a 2-D image that...
This paper describes the hybrid architecture developed for speeding up the processing of so-called multi-modal visual primitives which are sparse image descriptors extracted along contours. In the system, the first stages of visual processing are implemented on FPGAs due to their highly parallel nature whereas the higher stages are implemented in a coarse parallel way on a multicore PC. A significant...
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