Advanced Materials Research Vols. 850-851

Abstract: In this paper, the principal component analysis method is applied in the underwater image data for detecting the image objects. The system is designed to assist the underwater monitor system survey operations, specialized to the task of object identification. Firstly, the nature of the underwater is analyzed according to the image formation model and the appearance. Then, the discipline of the principal component analysis is theoretically analysis. Third, the principal component analysis method is applied in the underwater image for dimension reduction, extracting the image feather for recognition. Experimental results, which have been performed on a set of real underwater images, demonstrate the robustness and the accuracy of the principal component analysis in the task of underwater object recognition.

Abstract: Earth pressure can be divided into three kinds of load form by Spangler theory: vertical earth pressure, bed reaction and horizontal lateral pressure. According to Spangler theory, the level of static earth pressure presents a parabolic distribution in central angle bon both sides of the tubes. Used the glass steel pipe as the specific research object, Spangler theory applied to the three-dimensional buried tube model for finite element analysis, the analysis is divided into two situations: (1) the same soil, finite element analysis of different pipe diameter; (2) the same tube diameter, finite element analysis of different soil. This method can reasonably reflect the interaction of soil and structure, it is feasible. The complicated process of the finite element simulation of tube soil interaction can be avoided.

Abstract: Using dark channel prior to estimate the thickness of the haze , recent research work has made significant progresses in single image dehazing. However , it is difficult to apply existing method for processing high resolution input images because of t he heavy computation cost s of it . For some kinds of input images , existing method still can not reach enough accuracy . we develop a powerful and practical single image dehazing method. The experimental results show our gradient prior of transmission map s greatly reduces t he computation cost s of t he previous method. Furthermore , the optimization methods and parameter adjustment for our novel image prior enhance t he accuracy of the computation related with transmission map. Overall , compared wit h the state of the art , our new single image dehazing method achieves t he same, and even better image quality with only around 1/8 computation time and memory cost .

Abstract: There are many test generation algorithms currently. With continuously increasing of circuit scale, complexities of these algorithms are also increasingly sharply. Simple algorithms based on circuit structure, including exhaustive testing and pesudo-exhaustive testing, and simplicity of generation of test vector are more and more highlighted by scientific researchers and scholars. The dissertation mainly analyzes pseudo-exhaustive testing.

Abstract: With the development of information technology, the QR code technology in the application of information technology industry has become more and more widely, its action also is particularly important. In modern business activities, with the popularity of smart phones and all kinds of mobile intelligent device, which can realize the application is very extensive. But in practice, influenced by acquisition equipment, collections of images tend to have all kinds of noise, affect later decoding result. Late in order to decode the reliability and stability, based on the smart phone and mobile equipment acquisition have shadows and space of tilt of the QR code image as an example, discusses the gray, filtering, binaryzation, edge detection and image preprocessing technology such as geometric correction. Especially the closing operations in the application of morphology in image processing on the image to get rid of the shadow and corrosion expansion, extraction of the target area the edge of the straight line obtained very good effect, in addition to get rid of the shadow, the four control points using morphological expansion corrosion and correction of the QR code.

Abstract: An improved level set PDE based on the Chan-Vese multiphase level set method is proposed. Because the segmentation results is well influenced by the initial zero level set, we use the method based on Edge-Link to obtain initial zero level set of the proposed multiphase level set segmentation model. Experimental results of ambiguous edges in human motion image suggest the efficiency and accuracy of the algorithm in its segmentation operations.

Abstract: Based on tuber size statistics commercially available Longshu 3, new Daping, Zhuangshu 3, and the typical geometry of the statistical value of the potato be accessed. With application modeling technology contours data were imported into Solid works to generate solid model of potato. Maize grain boundary slice profile image were collected with the digital camera, By dint of the application of image processing technology and slice shape modeling technology the various parts of maize grain (seed coat and horny endosperm, salty endosperm, germ) three-dimensional solid model was generated.

Abstract: In order to study the coal and gas outburst similar simulation experiment, coal similar material was made up based on the similarity theory. Based on the previous similar material study, the cement, sand, water, activated carbon and coal powder was selected as the raw material of similar material. Meanwhile similar material matching program with 5 factors and 6 levels was designed by using Uniform Design Method. And the physical and mechanical properties of the similar material compressive strength was measured under different proportions circumstances. The relationship between similar material and the raw materials was analyzed. The results show that choosing different materials can compound different similar materials with different requirements. And the water-cement ratio plays a decisive influence on the compressive strength of similar material. The compressive strength of similar material decreases linearly when the water-cement ratio increases.

Abstract: Agglomeration reduces the productivity and the quality of polyethylene fluidized bed. The mathematical model cant characterize the nonlinearity of two-phase flow in the fluidized bed exactly, which make state monitoring and failure diagnosis to inner state of fluidized bed lacking assessment criterion. Acoustic emission sensor could monitor the signals from polyethylene granules impacting on the wall of fluidized beds. Use wavelet packet analysis to process the acoustic emission signals and extract voiceprint feature by MFCC. The feature vector is combined with the MFCC of all sensors. Reduce the dimensionality of vector by PCA and test the feature vector by BP neural network.

Abstract: In order to get further optimizations on tracking performance of the RLS algorithm in nonstationarity signal processing, and to simplify the variable forgetting factor updating model, a novel variable forgetting factor updating model based on Butterworth low pass filter transfer function was proposed. The relationship between the variable forgetting factor and the tracking performance of RLS algorithm was analyzed. The updating model proposed in this paper was built based on the modification of the transfer function of Butterworth low pass filter. The model function fit the theoretical variation curve of the variable forgetting factor well. It also could be adjusted by parameters of the function order and the critical point according to the different applications. In addition, the computation of the updating model was simple and convenience. The RLS algorithm with the updating model was tested in an adaptive interference cancellation system. Some conclusions were drawn from the simulation results. The optimized RLS algorithm had a better tracking performance in nonstationarity signal processing as well as small stationary errors after convergence.