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Two-dimensional Generalisations Of Dynamic Programming For Image Analysis

机译:图像分析动态规划的二维概括

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Dynamic programming (DP) is a fast, elegant method for solving many one-dimensional optimisation problems but, unfortunately, most problems in image analysis, such as restoration and warping, are two-dimensional. We consider three generalisations of DP. The first is iterated dynamic programming (IDP), where DP is used to recursively solve each of a sequence of one-dimensional problems in turn, to find a local optimum. A second algorithm is an empirical, stochastic optimiser, which is implemented by adding progressively less noise to IDP. The final approach replaces DP by a more computationally intensive Forward-Backward Gibbs Sampler, and uses a simulated annealing cooling schedule. Results are compared with existing pixel-by-pixel methods of iterated conditional modes (ICM) and simulated annealing in two applications: to restore a synthetic aperture radar (SAR) image, and to warp a pulsed-field electrophoresis gel into alignment with a reference image. We find that IDP and its stochastic variant outperform the remaining algorithms.
机译:动态编程(DP)是解决许多一维优化问题的一种快速,优雅的方法,但是不幸的是,图像分析中的大多数问题(例如恢复和翘曲)都是二维的。我们考虑DP的三种概括。第一种是迭代动态规划(IDP),其中DP用于依次递归解决一系列一维问题,以找到局部最优值。第二种算法是经验的随机优化器,它是通过向IDP逐渐增加噪声来实现的。最终方法是使用计算量更大的“前向后-吉布斯采样器”代替DP,并使用模拟的退火冷却时间表。将结果与现有的迭代条件模式(ICM)和模拟退火的逐个像素方法进行比较,在以下两个应用中:恢复合成孔径雷达(SAR)图像,并使脉冲场电泳凝胶变形以使其与参考物对齐图片。我们发现IDP及其随机变量的性能优于其余算法。

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