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We develop a new traffic data collecting device. The device is based on magneto-resistive technology, in which the circuit resistance is changed with the imposing magnetic field. It is known that ferrous-body vehicles interfere with Earth's magnetic field, which can be monitored with our device. The signal will then be processed and yields vehicle count, speed, occupancy time, and classification....
Deploying wireless sensor networks for detecting and counting vehicles is not a new concept. One disadvantage of most simple wireless sensor for detecting vehicles is wrong interpretation of complex vehicle such as a trailer truck with multiple containers. In this paper, we propose an improvement of a simple wireless sensor network for detecting vehicles developed by Chinrungrueng et al. This system...
This paper proposes an extension to our previous work on an automatic low-computed vehicle classification using embedded wireless magnetic sensor. A realization of our vehicle classification on embedded wireless magnetic sensor is studied in this work. The implementation allows real-time vehicle classification based on vehicle magnetic length, averaged energy, and Hill-pattern peaks. The system automatically...
This paper presents a novel algorithm in unsupervised object of interest discovery for multi-view video sequences. We classify a multi-view video sequence based on the degree of movement in a video sequence. In a video sequence with movement, we first group video frames along and across views as a group of picture (GOP). Key points or feature vectors representing textures existing in video frames...
A vehicle classification algorithm is proposed based on signal obtained with low computation magnetic sensor. We focus on an implementation of our algorithm on wireless magnetic sensor node. Since the sensor node has limitations on computing capacity and power source, the algorithm must not be too complex. Features we choose to extract for classification include normalized vehicle magnetic length,...
We describe an improved version of simple polling protocol employed in a wireless sensor network proposed. Although this simple wireless sensor network works efficiently, it is very limited in computing capability. Simple polling protocol works well in situation where every sensor node shares heavy traffic. However, when a few sensor nodes contribute to the traffic, most of the time slots allocated...
The two-rectangular-printed-spiral antenna with U-strip is proposed. The increasing electrical length and impedance matching is performed by using two spiral arms and adding U-strip. There is no ground plane for this antenna structure. The size is relatively small. The measured return loss is -12.435 dB at 433 MHz with 5.455 % bandwidth (428-452 MHz). The measured absolute gain is about -5 dBi. The...
This paper proposes the compact antenna for server node of wireless sensor network system. The antenna parameters are varied to achieve the nearest horizontally polarized omnidirectional pattern. The overall antenna width, length and height are fixed for suitable installation. The antenna structure is simple and its design is straightforward. The return loss, radiation pattern, absolute gain and cross-polarization...
The short-range and near ground measurements of signal attenuation in the UHF band are performed to study radio wave propagation in a car park for a wireless sensor network application. The measurement setup is based on the radio wave propagation along the row of a parking lot (full of cars) by varying heights of server antenna. In the application, a small antenna and a compact antenna are employed...
We develop a new algorithm to select the basis that provides an optimal clustering of non-stationary multidimensional data. This optimality is obtained according to a new cost function that measures the clustering power of a basis vector or feature. Our approach does not require any training sets or any models of the clusters. The basis is searched in a dictionary of wavelet packets. We have conducted...
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