Seamline detection in colour orthoimage mosaicking by use of twin snakes
Seamline detection in colour orthoimage mosaicking by use of twin snakes
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DOI：
10.1016/s0924-2716(01)00033-8
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发表时间：
2001-06-01
影响因子：
12.7
通讯作者：
Kerschner, M
中科院分区：
文献类型：
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作者：
Kerschner, M
在马赛克生产链的最后一步。将场景的相邻且部分重叠的正射图像合并为一个马赛克。这样做的方式，从一个到另一个正交图像的过渡不能被看到。正射影像的生产线由几个步骤组成，每个步骤都可以为所得到的正射影像引入关于几何形状、辐射测量和光谱特性的不同外观。用于镶嵌相邻的正射影像。在这些图像的重叠区域中搜索准则组合中的最低差的路径。接缝线是沿着最大相似性的路径沿着选择的。在本文中，这样一个最佳的接缝线在彩色正射影像的标准进行了阐述。主要要求是一方面图像的高颜色相似性（主要在色调和强度方面），另一方面高纹理相似性（在图像梯度的方向和幅度方面）。指定的标准制定的能量函数的蛇。蛇是一个活动轮廓，它在图像中移动并改变形状，直到找到其能量函数的最小值。我们使用两条相互吸引的蛇（双蛇）。在分层策略中，完全自动地描绘适当的接缝线。最后通过实例说明了该方法的可行性。(C)2001 Elsevier Science B.V.保留所有权利。
In the last step of the mosaic production chain. neighbouring and partly overlapping orthoimages of a scene are merged to one mosaic. This should be done in a way that the transition from one to another orthoimage cannot be seen. The production line of orthoimages consists of several steps, each of which can introduce a different appearance regarding geometry, radiometry and spectral properties to the resulting orthoimage. For mosaicking adjacent orthoimages. a path of lowest difference in a combination of criteria is searched in the overlap area of these images. The seamline is chosen along this path of maximum similarity. In this paper, criteria for such an optimal seamline in colour orthoimages are elaborated. The main requirements are on one hand high colour similarity of the images (mainly in hue and intensity), and on the other hand high texture similarity (in orientation and magnitude of image gradients). The specified criteria are formulated in the energy function of snakes. A snake is an active contour which moves through an image and changes its shape until a minimum of its energy function is found. We use two snakes that attract one another (twin snakes). In a hierarchical strategy, a proper seamline is delineated fully automatically. The potential of the method is shown with an example. (C) 2001 Elsevier Science B.V. Alt rights reserved.