期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
An advanced wind vector retrieval algorithm for the rotating fan-beam scatterometer
1
作者 XIE Xuetong WEN Ya HUANG Zhou 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2017年第5期83-89,共7页
The rotating fan-beam scatterometer (RFSCAT) is a new type of satellite scatterometer that is proposed approximately 10 a ago. However, similar to other rotating scatterometers, relatively larger wind retrieval erro... The rotating fan-beam scatterometer (RFSCAT) is a new type of satellite scatterometer that is proposed approximately 10 a ago. However, similar to other rotating scatterometers, relatively larger wind retrieval errors occur in the nadir and outer regions compared with the middle regions of the swath. For the RFSCAT with the given parameters, a wind direction retrieval accuracy decreases by approximately 9 in the outer regions compared with the middle region. To address this problem, an advanced wind vector retrieval algorithm for the RFSCAT is presented. The new algorithm features an adaptive extension of the range of wind direction for each wind vector cell position across the whole swath according to the distribution histogram of a retrieved wind direction bias. One hundred orbits of Level 2A data are simulated to validate and evaluate the new algorithm. Retrieval experiments demonstrate that the new advanced algorithm can effectively improve the wind direction retrieval accuracy in the nadir and outer regions of the RFSCAT swath. Approximately 1.6 and 9 improvements in the wind direction retrieval are achieved for the wind vector cells located at the nadir and the edge point of the swath, respectively. 展开更多
关键词 rotating fan-beam scatterometer objective function wind vector retrieval distribution histogram ofbias wind direction extension
下载PDF
Shape Retrieval Using ECPDH with Dynamic Programming
2
作者 Xin Shu Lei Pan Yunsong Qi 《Journal of Computer and Communications》 2016年第16期63-78,共16页
The matching and retrieval of the 2D shapes are challenging issues in object recognition and computer vision. In this paper, we propose a new object contour descriptor termed ECPDH (Elliptic Contour Points Distributio... The matching and retrieval of the 2D shapes are challenging issues in object recognition and computer vision. In this paper, we propose a new object contour descriptor termed ECPDH (Elliptic Contour Points Distribution Histogram), which is based on the distribution of the points on an object contour under the polar coordinates. ECPDH has the essential merits of invariance to scale and translation. Dynamic Programming (DP) algorithm is used to measure the distance between the ECPDHs. The effectiveness of the proposed method is demonstrated using some standard tests on MPEG-7 shape database. The results show the precision and recall of our method over other recent methods in the literature. 展开更多
关键词 Shape Descriptor Shape Retrieval Elliptic Contour Points distribution histogram Dynamic Programming
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部