A Method of Obtaining Ice Concentration and Floe Size From Shipboard Oblique Sea Ice Images

A Method of Obtaining Ice Concentration and Floe Size From Shipboard Oblique Sea Ice Images
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一种从船载倾斜海冰图像获取冰浓度和浮冰尺寸的方法

DOI:
10.1109/tgrs.2010.2042962
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发表时间:
2010-04
影响因子:
8.2
通讯作者:
Li, Zhijun
Li, Zhijun
中科院分区:
工程技术1区
文献类型:
--
作者:
Lu, Peng;Li, Zhijun

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数码相机被广泛应用于考察船上,以确定多冰海域的冰层状况。然而,如果相机相对于海面倾斜,图像的几何失真是无法避免的。为了准确测量海冰特征,基于摄影测量理论,对倾斜摄影引起的几何变形进行了定量估计。提出了一种精确计算冰块浓度和浮冰大小的方法,并对相应的简化方法进行了验证。合理选择相机系统参数(相机高度、倾斜度和焦距),既可以避免几何失真带来的误差,又可以充分利用图像信息。此外,在2006年冬季韦德尔外流研究期间获得的倾斜海冰图像也使用这里开发的方法进行了调查。结果表明,通过对每个图像像素点的分析,可以准确地纠正倾斜图像的几何失真,简化方法可以保证计算冰特征的精度和效率。
Digital cameras are widely used on research vessels to ascertain ice conditions in ice-infested seas. However, geometric distortion of images cannot be avoided if the camera is tilted relative to the sea surface. In this study, the geometric distortion induced by oblique photography was quantitatively estimated based on photogrammetric theory to enable accurate measurement of sea ice features. One accurate method of calculating the ice concentration and floe size was developed, and a corresponding simplified method was also tested. Proper selection of camera system parameters (camera height, tilt, and focal length) cannot only avoid possible errors induced by geometric distortion but also make full use of the image information. Additionally, oblique sea ice images obtained during the 2006 Winter Weddell Outflow Study were investigated using the methods developed here. The results revealed that the geometric distortion of oblique images could be accurately corrected by analyzing each image pixel and that the simplified method could be applied to ensure the precision and efficiency of calculating ice features.
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