Papers by Author: Chun Feng Liu

Abstract: By giving a centroid algorithm to extract pixel coordinates of each circle in the center of a circle under the coordinates, through the coordinate transformation the image coordinates can be obtained. Based on the data obtained from above to verify the model, from the specific data of the relative error, absolute error and error propagation theory to discuss the algorithm accuracy and stability. Finally using the least square method, according to the mean square error criteria for the establishment of a minimum of three-dimensional coordinate system fixed relative position of two cameras, binocular positioning mathematical models and by discussing the nature of matrix and the relationship between the relative position of the camera to calibrate the binocular digital camera.

Abstract: Digital cameras have been widely used in the areas of road transportation, railway transportation as well as security system. To address the position of digital camera in these fields this paper proposed a geometry calibration method based on feature point extraction of arbitrary target. Under the meaning of the questions, this paper first defines four kinds of coordinate system, that is the world coordinate system. The camera's optical center of the coordinate system is the camera coordinate system, using the same point in different coordinate system of the coordinate transformation to determine the relationship between world coordinate system and camera coordinate. And thus determine the camera's internal parameters and external parameters, available transformation matrix and translation vector indicated by the camera's internal parameters of the external parameters and the establishment of a single camera location model. According to the model, using the camera's external parameters to be on the target circle center point in the image plane coordinates.

Abstract: With rapid growth of national economy, infrastructure construction maintains its vigorous development, but there are some serious problems in this field, for example, construction unit and supervision unit may conspire together to swindle governmental capital. This paper introduces some background which exists in construction project management system, analyses relation and benefit of project’s tripartite main body, and establishes conspiracy game’s utility matrix of construction unit and supervision unit by introducing game theory. By establishing conspiracy game model between construction unit and supervision unit, the paper mainly discusses conspiracy action which may occur between construction unit and supervision unit (rent-seeking and rent-creating), gets equilibrium probabilities of seeking rent and creating rent, and make some further analysis.

Abstract: As one aspect of granular computing, hierarchical knowledge granularity can speed up solution, and reduce computational complexity. This paper describes the structure and hierarchy analysis of granularity simply, details the current methods of construction algorithms in granular computing, and emphasizes the performance comparisons of various construction algorithms, and finally reviews the applications of knowledge granularity in rule extraction, attribute reduction, cluster analysis, optimization theory, neural network and fuzzy control and so on.

Abstract: In 2009 from the comprehensive competitiveness comparison of nearly 300 cities on district level shown in "Chinese Urban Competitiveness Report", 12 competitivenesses of more than 50 major cities are evaluated by using econometric models, and Chinese most competitive top 10 cities of Year 2009 emerge. Since the city's comprehensive competitiveness ranges many indexes which are difficult to quantify and various best programs with fuzziness, the fuzzy analytic hierarchy process (FAHP) is relatively more scientific and objective. This paper presents Mathematica program which use fuzzy analytic hierarchy process to evaluate the the city's comprehensive competitiveness, and the practicability of FAHP presented in this paper may provide the reference to the researchers in the field.