Advanced Materials Research Vols. 989-994

Abstract: In this paper, physical layer cooperative communication of code division multiple access system is explored. Many mobile terminals relay signals for each other so as to achieve spatial diversity. The cooperative scheme of the mobile terminal is well designed. The uplink system model, as well as the receiving structure is given. The performance advantage of such system is clearly indicated through simulation.

Abstract: In this paper, we propose an improved method for reconstruct 3D facial shape from a single frontal image. We use improved fast marching method to solve the Eikonal equation which can obtained from the method of shape from shading (SFS). In order to overcome the concave-convex ambiguity problems inherent to SFS, we find out the concave region and recover concave into the convex keeping the relative shape invariant to reconstruct the accuracy facial shape.

Abstract: With combining Unmanned Aerial Vehicle (UAV) and the high-precision of the low altitude Remote Sensing (RS) technology, UAV RS technology has become an important compleme-nt for satellite and manned aircraft RS, so it has drawn great attention of people at home and abroad. Most of UAV RS image technologies use small digital cameras to shoot so that it causes some proble-ms such as lower magnitude, more and larger morphing image. The image processing and mosaicing system of UAV RS implements the function of image identifying, selection of image group control points, geometric correction, mosaicing, seam lines eliminating automatically and rapidly with Interactive Data Language (IDL), and is targeted to solve the practical application problems such as preprocessing, mosaicing, seam-lines removing of civil UAV RS image.

Abstract: With the development of the internet, more and more images appear in the internet. How to effectively retrieve the desired image is still an important problem. In the past, traditional color histogram is used image retrieval system, but color histograms lack spatial information and are sensitive to intensity variation, color distortion and cropping. As a result, images with similar histograms may have totally different semantics. So the spatial information should be included in color histogram. The color histogram based on saliency map approach is introduced to overcome the above limitations. In this paper, we present a robust image retrieval based on color histogram of saliency map. Firstly, in order to extract useful spatial information of each pixel, the steady saliency map of the images is extracted. Then, color histogram based on saliency map is introduced, and the similarity between color images is computed by using the color histogram of saliency map. Experimental results show that the proposed color image retrieval is more accurate and efficient in retrieving the user-interested images.

Abstract: Beamforming technique based the reciprocity of LTE communication system for high-speed railway is a practical way to improve the system performance in this paper. Kerdock codes, which facilitate efficient codebook and codeword search, are implemented in the LTE system for high-speed railway as the beamforming precoding codebook. The analysis of complexity and simulation results about the communication system of the beamforming with Kerdock codes (KBF) show that the proposed KBF can eliminate complex multiplications and improve the Bit Error Rate (BER) performance at large SNR compared with the existing beamfoming communication system for high-speed railway.

Abstract: This paper designs an image encryption algorithm with a dynamical feedback operation based on sensitive chaotic system. In the proposed algorithm, the piece wise linear chaotic map is selected to construct pseudo-random keystream sequences. The pseudorandom keystream sequences are used to permute and substitute the plain image data. To enhance the complexity and security of the algorithm, each pixel is dynamically confused by its two previous adjacent encrypted pixels which are specified by a quantized binary tuple derived from a chaotic element. Both theoretical analysis and experimental tests show that the proposed algorithm is secure and efficient.

Abstract: In this paper, the author starts from the literature reviews and the development and application of the video analysis technology software in the sports area, discussing the movement video collection, the processed and transformed digits from the computer software. Through the application of the first-line coaches and teachers in the sports teaching course, the athletes or students can see the technical action and tactical implementation effects, get the timely and accurate analysis information of which it will be beneficial to put the language style into the intuitive image, make the exchange for the coach or the students at the spot. In this way, the sports training and the teaching results will be greatly improved.

Abstract: Moire effect is a special optical phenomenon caused by the interference of light. In the printing industry, it is also called Moire phenomenon which is caused by superposition of the multicolor printing dots for halftone images. Now it is widely used in the anti-counterfeiting areas. In this paper, we firstly introduce the basic principle of Moire effect. Then we describe several main applications of the Moire effect in the field of halftone image security. We review the main types of Moire-based anti-counterfeiting methods, compare them, and explain how they can be used for such security applications. It will provide the necessary technical information for the persons that in anti-counterfeiting area.

Abstract: In the face of mass movement of image data storage management and retrieval applications, traditional search techniques and methods have been completely incompetent. The emergence of the technology on Based-Static Motion Image Retrieval, points out a specific direction for the development of the field of information retrieval. First of all, the thesis analyze the basic principles of the Based-Static Image Retrieval technology and Based-Static Motion Image Retrieval technology. And the thesis discuss mainly the relevant key technologies and development situations whose based on the static motion image retrieval technology. Secondly, the thesis Introduce and analyze, briefly, the characteristics and application background of several motion image retrieval prototype system, which developed by the domestic and foreign research institutes.

Abstract: As the physical meaning of components are different in feature vector, this paper presents a weight query vector based on QPM to represent the user’s true intention more properly, and then proposes two RF frameworks to learn the weights for positives and negatives in the feedback process of CBIR by PSO. Experiments were conducted to validate the proposed frameworks based on color histogram weight-vector. The proposed frameworks were compared and outperformed four other relevance feedback methods regarding their efficiency and effectiveness, thanks to the fact that they can make full use of the features’ different importance.