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【2017年整理】第七章 图像分割.ppt

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极坐标方程 2.按点的坐标(x,y)和每个角度θ求r (x,y) (2,0) (1,1) (2,1) (1,3) (2,3) (4,3) (3,4) -45° 1.4 0 0.7 -1.4 -0.7 0.7 -0.7 0° 2 1 2 1 2 4 3 45° 1.4 1.4 2.1 2.8 3.5 4.9 4.9 90° 0 1 1 3 3 3 4 7.2 hough 变换 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 极坐标方程 3 统计 出现的次数。 最大次数3出现 7.2 hough 变换 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 极坐标方程 则相对应的图像空间中的线分别为: 和 7.2 hough 变换 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 极坐标方程 霍夫变换检测到的直线 7.2 hough 变换 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Hough 变换的函数实现 7.2 hough 变换 hough:计算图像的hough变换空间 Syntax: [H, theta, rho] = hough(BW) [H, theta, rho] = hough(BW, Parameter1, Parameter2) BW是二值图像 Parameter1:指定了theta方向的分辨率 Parameter2:指定了lamda方向的分辨率 H:hough变换空间矩阵 Theta和rho:为返回的theta和lamda值 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Hough 变换的函数实现 7.2 hough 变换 houghpeaks:Identify peaks in Hough transform Syntax peaks = houghpeaks(H, numpeaks) peaks = houghpeaks(..., param1, val1, param2, val2) H是hough变换矩阵空间 Numpeaks指定峰值的数目 Peaks是容纳峰值的行列坐标的矩阵 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Hough 变换的函数实现 7.2 hough 变换 houghlines:Extract line segments based on Hough transform Syntax lines = houghlines(BW, theta, rho, peaks) lines = houghlines(..., param1, val1, param2, val2) 从hough变换空间选出候选峰值后,利用峰值所对应的theta和rho值找到直线的位置。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Hough 变换的函数实现 7.2 hough 变换 houghlines:Extract line segments based on Hough transform Syntax lines = houghlines(BW, theta, rho, peaks) lines = houghlines(..., param1, val1, param2, val2) 从
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