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As the limited depth-of-focus of optical lenses, it is usually difficult to get an image that contains all information of the objects in focus. Multi-focus image fusion method can solve this problem effectively. A new multi-focus image fusion method was proposed, which is based on curvelet transform. After analyzing the classical multi-focus image fusion method, we use the maximum local energy method...
The DS-CDMA system has a serious problem that is the multiple-access interference (MAI). Usually, people use the Multi-User detection (MUD) to cancel the MAI. The Multi-User detection makes the best use of the information of other users to cancel the MAI. Indeedly, MUD can cancel the MAI completely, but it has very large computational burden and it increase the noise of the system, besides, it needs...
A blind digital watermarking algorithm based on chaotic is proposed. Logistic system is used to generate chaotic sequence, which is binarizated in the following step. Then one-dimensional binary Logistic sequences are changed into two-dimensional matrix through inverse Zigzag scanning, which is XOR encrypted with the original watermark. Turn the original color image to the YCbCr color spaces, and...
Nature is a talented designer. She makes every natural form existing in the world has own clever and unique shape, color, texture, structure and function. In product form design, using bionic principle, the research and application of natural biological form are carried out. Based on concrete or abstract bionic means, by extracting, simplifying evolving the form features of researched object, design...
The advantages and disadvantages of car body design with the forward and the reverse way is discussed. Hybrid design process with forward and reverse way for car body is proposed. Hybrid design interface technology of car body is study. The three different types of data interface are given. Combined with the hybrid design examples, the new design manner is realized.
Orthogonal Frequency Division Multiplexing (OFDM) has recently been focused on in high-data-rate wireless communication research. But the High Peak-to-Average Power Ratio (PAPR) is one of the main obstacles to limit wide application. In this paper, signal scrambling techniques on reducing PAPR are presented, including Selective Mapping (SLM), a modified scheme of SLM by using the standard arrays and...
Multiple access interference (MAI) is one of the main factors that deteriorate the performance of CDMA systems. The anti-MAI performance of auxiliary vector receivers is studied in this paper. Simulation results indicate that the weight coefficient of an auxiliary vector (AV) diminishes sharply as the AVpsilas sequence number increases, thus the systempsilas performance gain brought by the increase...
Orthogonal frequency division multiplexing (OFDM) has recently been focused on in high-data-rate wireless communication research. But the high peak-to-average power ratio (PAPR) is one of the main obstacles to limit wide applications of OFDM. In this paper, these techniques on reducing PAPR are presented, including signal distortion, signal scramming, and block coding. Furthermore, such PAPR solutions...
This paper introduces a new kind of recovery method which is the combination of Bayesian estimation and wavelet threshold. Wavelet coefficients of signals show strong characteristics of the non-Gauss statistics, its probability density function can be modeled by alpha-stable priori distribution. This paper uses Bayesian estimation to obtain the low frequency coefficients, and deals with high frequency...
Head-related transfer functions (HRTFs) refer to the spectral filtering from sound sources to listenerspsila eardrums or ear canals. As an effective model structure, the degree of the IIR filter approximation of the HRTFs, whose design and implementation is a specific spectrum function approximation process, is much lower than that of the FIR. Based on the assessment of HRTFs different importance...
This paper mainly presents two approaches for image retrieval. There is some faintness in color locating in quantification boundary when image color is quantized. The membership function in fuzzy set theory can describe the fuzzy transition preferably. In this paper, the membership function in HSI color space is adopted to solve the problem above. At the same time, spatial information is integrated...
SIFT (scale invariant feature transform) is used to solve visual tracking problem, where the appearances of the tracked object and scene background change during tracking. The implementation of this algorithm has five major stages: scale-space extrema detection; keypoint localization; orientation assignment; keypoint descriptor; keypoint matching. From the beginning frame, object is selected as the...
A new algorithm of color image blind watermarking based on BP neural network and wavelet significant tree is proposed. In YCbCr, the luminance component is decomposed with wavelet, and the wavelet significant tree can be found. Then the correlativity among nodes of wavelet significant tree is described by the nonlinear relationship responded by the trained BP neural network. Based on the relationship,...
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