Advanced Materials Research Vols. 989-994

Abstract: In a vision-based system for mobile robot/human localization in the environment, extracting feature from images and image matching are important for the final results. Although there are many algorithms for image matching, they are not fit for this system. A new method is designed to improve image matching effect.

Abstract: The space-based visible observation imaging platform for sky targets is influenced by many factors, a serious factor is the light of background too bright. A image with the bright stray light background has some high gray areas those may submerge the targets info. Aimed at the shortcomings of traditional background removal method in target extraction under the bright stray light background, according to the differences of bright stray light background and sky targets imaging characteristics, this paper has made some research of the algorithms about how to remove the bright stray light background but not delete the targets info. The algorithm we got that give us great results will be shown in the paper. It solves the problems of the bright background light removal and greatly retain the targets info which submerged in the bright areas.

Abstract: In order to build WBAN devices and design WBANs, it is imperative to study the characteristics of WBAN channel and model the channel accurately. WBAN channel models are so different from the traditional mobile channel models and there are few publications on them. In this paper, we studied the statistic characteristics of the WBAN channel based on the IEEE 802.15.6 models. We focus on body surface nodes to external nodes, simulated the path loss models on 820 MHz and 2.36 GHz at both LOS and NLOS situations. We also used the Gauss model to fit the statistic results of the path loss and obtained coefficients of Gauss model.

Abstract: When the root is collecting data at a tree-based network, more upper nodes is usually with more packets usually. We called this bottleneck problem. The goal of this paper is to solve the bottleneck problem in ZigBee tree network. We use The Beacon-Only Period Approach which has been proposed by IEEE802.15.4b to avoid the collision caused by beacon frame. Moreover, we propose a centralized algorithm (TDMLF) that enables the nodes to fully use the GTS transmission. TDMLF not only avoides the hidden node problem which occurs in IEEE802.15.4, but also enables the entire network to achieve a more effective parallel transmission. Simulation results show that the TDMLF algorithm effectively reduces the bottleneck problem, and thus achieves a high delivery ratio. Moreover, because of no collision, the TDMLF also reduces the waste of time and energy by retransmission.

Abstract: This paper presents a robust but simple image feature representation method, called image decomposition based on Euler mapping (IDEM). IDEM firstly captures the orientation information by implementing arctangent operator for each pixel. Then, the orientation image is decomposed into two mapping images by executing Euler mapping. Each mapping image is normalized using the “z-score” method, and all normalized vectors are concatenated into an augmented feature vector. The dimensionality of the augmented feature vector is reduced by linear discriminant analysis to yield a low-dimensional feature vector. Experimental results show that IDEM achieves better results in comparison with state-of-the-art methods.

Abstract: The visual attributes of color are suitable for human perception and computer vision. A Color space is defined as a model for representing the intensity value of color. We propose a color space comparison and analysis between RGB and HSV based images retrieval. We succeed in transferring the image retrieval problem to sequences comparison and subsequently using the color sequences comparison between the color featurs of RGB and HSV to compare and analyze the images of database.

Abstract: This paper proposed a detection algorithm for copy-move in same image based on dyadic wavelet transform. First of all, four sub images could be got through the decomposition of detecting image by dyadic wavelet transform. Secondly, high-frequency and low-frequency sub image were decomposed into blocks without any overlap and two sub image’s dyadic wavelet coefficients were regarded as the eigenvalue of the image block. At Last, both the high similarity among the low-frequency sub image blocks and the low similarity among the high-frequency sub image blocks were selected as a distorted image block. A kind of image edge processing methods was used to improve the tampering region at the same time. Through the experiments, it shows that the algorithm got the higher detection rate and lower error rates.

Abstract: A brief introduction of hybrid automatic repeat request (HARQ) is given first, and then a description of physical uplink shared channel (PUCCH) or physical uplink shared channel (PUSCH) receiving and reporting the HARQ-ACK information in bundling mode or multiplexing mode is made in detail. Based on the principle, a scheme is designed to solve the problem of receiving and reporting the HARQ-ACK information.

Abstract: Proposed is an algorithm of NSCT-Based Image Enhancement Combing Homomorphic Filtering With Fuzzy theory to improve the performance of traditional algorithms in the expression of the image edge detail and contrast. With the NSCT, both the low and high frequency sub-band components can be extracted. We dispose of the low frequency sub-band components of the decomposed image by homomorphic filtering and enhance the high-frequency sub-band components with fuzzy sets theory. Then the reconstructed image after above enhancement is obtained by using NSCT inverse transform.

Abstract: Book positioning in mobile phone libraries could make readers acquire books conveniently andquickly. Readers could use mobile phone access to OPAC system, and apply to book positioning systemwhich is based on RFID system for book positioning. The book positioning system combines with the RFIDsystem to fix the position of books, converts spatial information of books to geographic location information,then feedbacks the information to readers by mobile phone.