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We propose a new design of 25-GHz flat-top multichannel optical filter. The flat-top of optical filters can improve to 2.288×10-11dB which is superior to that of 5 orders of previous study. The superior performance of dispersion and channel spacing isolation improve 73.5% and 94%, respectively, which compared with current available commercial products and previous study.
It is an effective solution to recognize the position of intravenous infusion needles using the Zernike moments invariants. Firstly, preprocessing and normalizing the character image are introduced; secondly, the image's rotation invariant features using Zernike moments are gotten. The result shows that the Zernike moment has better invariant properties, and can describe robustly the needle-image...
Facing the monitoring demand to the progress of key project using remote sensing technology, the Beijing-Tianjin inter-city railway project (Beijing South Railway Station) was taken for example and the high resolution remote sensing image of 2005 (before project) and 2007 (in project) were used as data source. At first, we built land-use classification index system. Then land-use information of South...
This paper analyzes construction method of Mathematical morphology structure element, puts forward a new algorithm for constructing mathematical morphology structure element , combined genetic algorithm, and designs corresponding genetic fitness function, cross operator and mutation method. We apply structure element obtained from this algorithm to traffic vehicle detection, and carry out experimental...
Understanding timely of the changes in land resources, rapid and accurately access to land information has become one of the important foundations that solved the conflict between man and land. This paper selects a region study in the west of Chengdu, application of "QuickBird" data, measurement and statistics and other auxiliary data, combined with Erdas Imagine, eCogntion and ArcView and...
Vector feature matching method is one of the key techniques in data updating. In this paper, disadvantages of existed methods have been analyzed, and a matching method of polygon shapes based on tangent space has been proposed. This method has also combined with discrete curve evolution algorithm to improve the efficiency of matching shape, which can simplify the complexity of polygons . And the paper...
Based on RS and GIS technology, use the landscape pattern analysis software FRAGSTATS3.3, analyzed landscape changes in Miyun county in 1990, 2000, 2009 nearly 20 years. From landscape structure, spatial distribution and relationship aspects discussed about the landscape changes. Using patch area index, path density index, edge density index, shape index, connection Index and cohesion index describe...
In many situations, we have to read characters on the object we are inspecting. Typically, the character text is horizontal, in this case, we can recognize the character easily, and the recognition methods are very mature. But, sometimes the characters distribute on the circle or ellipse, and the characters are distortion, which bring us huge trouble to recognize. This paper main about how to read...
The paper presents a method of image retrieval using ellipse shape feature and particle swarm optimization. Based on Fourier descriptor (FD), this method decomposes the contour of image into a series of ellipses. An ellipse can be simply represented with semi-major axis, semi-minor axis, and orient angle. Because the distinction of different ellipses' parameters is remarkable, the weights of parameters...
Landscape spatial patterns have profound implications for the functions of ecosystem. Remote sensing is an important tool for monitoring and managing structural changes of protected areas. Based on landscape ecological principles, the paper presents a case study on landscape pattern with the application of satellite remote sensing and GIS data, using dynamic analysis method. Such indices as the patch...
Gait is thought to be the most effective feature for human recognition in the distance. For optimal performance, the feature should include as many different types of information as possible, so in this paper, we present an integrated feature, which integrates motion feature and shape feature based on the Bayesian theory. For motion feature, we use shape variation-based frieze pattern (SVB frieze...
At presents, the technique of multi-feature combination of trademark image retrieval is an increasingly popular branch of CBIR. In this paper, it's proposed that multi-feature combination based on color and shape is applied to trademark image retrieval. Firstly, RGB color space is converted to HSV color space, which complied with human visual perception better. Then color moments, which can describe...
This paper introduced a new way for information graph to demonstrate the two-dimension data table. The Graphs drawn by the new method is divided into three types for vertical, horizontal and full-table comparison respectively. In the society of information, the information is not only to be administrated, but also to be analyzed. The graph of data is the base of analysis. Having drawn the graph of...
Based on characteristics of clear geometry features in high-spatial resolution remote sensing image, the paper presents a study method of land use/cover by object-oriented classification. The object-oriented classification method overcomes salt and pepper phenomena of conventional classification method by using feature object as basic processing units, which are generated from image segmentation....
After analyzing the curvature expression, the inflection points were given by the known planar cubic B'ezier control polygon information. Based on that, we proposed a brief algorithm that can obtain the shape feature points of cubic Bézier and B-spline curves. Experimental results show that the method is rapid, accurate, and robust.
We develop a method to construct tetrahedral mesh from contours in this paper. Each tetrahedron is generated under the supervision of the defined quality measure standard. This method reduces possibility of intersection between the segment and the triangle. Intersection test is sufficiently analyzed to guarantee that there is no overlap between tetrahedrons.
Based on MODIS snow cover products from 2003 to 2008, spatial and temporal distribution of snow is analyzed in Yangbajain basin of Lhasa River Basin. In spatial characteristics, snow-cover ratio varied with elevation in "S" style. In temporal features, there is not a significant trend of snow-covered ratio in the 6-year series from annual-scale. While in a year, the elevation zone between...
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