Volume 11, Issue 1, October 2011

Pedestrian-to-Vehicle Communication System for Pedestrian Safety Using Both Cellular Wireless Network and WLAN [Full Text]

Chika Sugimoto and Yasuhisa Nakamura

Abstract—
We propose a pedestrian-to-vehicle communication system without roadside equipments using both 3G cellular wireless network and wireless LAN for improving pedestrian safety. One of the effective measures against pedestrian accidents is to make each of pedestrians and drivers find the others and recognize the risk from out of sight and with time to spare for avoidance of accidents. We focused on intersections as a traffic scene to be covered by the system. At some blind intersections where the propagation property of NLOS roads is worse than that of straight roads, the potential for WLAN to serve as P2P communication method was verified. Information was exchanged via 3G cellular wireless networks in a wide area, and then could be directly exchanged between a pedestrian and a vehicle via WLAN 20m and 100m away from an intersection to different directions in about 20ms. The system could give an alarm to pedestrians and vehicles with collision risk. Sensory tests showed that the system seems to be effective for making drivers recognize pedestrians in NLOS areas and heightening safety.

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A Very Compact Ultra-Wideband Monopole Antenna with Triple Band-Notched
[Full Text]

M.Mighani, M.Akbari, A.Izadi and R.Gholami

Abstract—
In this paper, an ultra wideband antenna with capability of triple band-notched is designed. The proposed antenna consists of a simple hexagonal radiation patch and a partial ground. The antenna has a very compact size of 15 × 10 × 1 mm3 which by using a new technique its bandwidth has been increased from 2.85 to 17.8 GHz for VSWR ≤ 2. By using a slot line with length of λg/2 on the patch and two other L shaped slots with lengths of λg/4 on the ground have obtained band-rejected filtering properties for the interference bands WiMAX, WLAN, and ITU. Measured Radiation patterns of the antenna are non directional at H-plane and almost bidirectional at E-plane.

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Performance Enhancement of Fractional Coefficients of the Discrete Hartley Transform for Palm Print Recognition
[Full Text]

Dr. H. B. Kekre, Dr. Tanuja K. Sarode and Aditya A. Tirodkar

Abstract—
One of the most rapidly growing techniques in Biometric Identification is that of Palm Print Recognition. One commonplace technique for this purpose is that of applying Discrete Fourier-related Transforms to Palm Prints and then using these transformed images for comparison. The Discrete Hartley Transform is one such integral transform closely related to the Fourier Transform. As compared to generally used transforms such as the Discrete Cosine Transform, it is seen that the Discrete Hartley Transform performs poorly especially showing a decrease in accuracy when it is applied in the form of fractional coefficients. When applied as fractional coefficient, other transformations are found to show vast improvements in accuracy. Our paper provides a solution to this problem based on an analysis of the transformed image obtained by using the Discrete Hartley Transform. We then test this hypothesized solution on a database of over 8000 Palm Print images, calculating and comparing accuracy values for different fractional coefficients of the Palm Print images obtained using the DCT, the original DHT coefficient extraction method and our improvised technique for the same, along with a quantitative comparison for processing time and provide inferences based on our findings.

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A wavelet separate sign approach for video coding and motion vector study [Full text]

W. Hassen, J. Mbainaibeye, H. Amiri and C. Olivier

Abstract—
Video compression algorithms use motion compensation to provide better results by increasing the temporal correlation between pixels from consecutive frames. A precise estimate of the motion is necessary to minimize temporal redundancy. However, a motion vector field of high precision is very expensive in binary resources compared to the cost of residual coding. In this paper, we present a new approach for color video coding that which can reduce the cost of storage and the bandwidth transmission of video file. The new method is a sub-band coding approach that employs Discrete Wavelet Transform (DWT) and is based on a separate sign coding (SSC) from wavelet coefficients amplitude. Furthermore, we study the motion vector for some test sequences with different motion types. And we propose an optimized motion vector representation. Then, we present a motion vector coding scheme for video compression which based on a single motion vector entropic coding. An assessment of the proposed scheme was operated on a set of standard video sequences. In a first part, test video sequences were compressed with this codec, and the results obtained indicate that SSCMC outperforms H.264-AVC in terms of PSNR quality assessment for some standard video sequences and in terms of perceptual metric as structural similarity metrics (SSIM) and Video Quality Metric (VQM). Furthermore, the decoded video sequences visualized presents a competitive visual quality compared to H.264-AVC standard.