[第四章图像增强.ppt

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2017-01-09 发布于北京
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[第四章图像增强.ppt

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[第四章图像增强

* * * * * * * * * * * * * * * * * * * * * * * 3 x 3 模板 -1 -1 8 -1 -1 -1 -1 -1 -1 1/9 * Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5 x 5模板 1 -1 1 8 -1 1 -1 1 1 -1 1 -1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1/25 * Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2.频域高通滤波法 1）理想高通滤波器 2）梯形高通滤波器 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3）巴特沃思高通滤波器 n=3 4）指数高通滤波器 n=3 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. IHPF BHPF EHPF Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 5）带通（带阻）滤波器抑制以点（u0,v0）为中心，D0为半径的邻域中所有频率的理想带阻滤波器（IBPF）的转移函数为： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. （a）被正弦噪声污染的图像（b）图像（a）的频谱（c）巴特沃思带阻滤波器（d）滤波效果 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. IHPF BHPF EHPF Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. IHPF滤波效果，D0=15，30，80。D0越小，振铃效应越明显。 BHPF,比IHPF的结果平滑得多。 EHPF滤波效果 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3. 高通锐化 X光片原图；高通滤波效果；高频增强效果；直方图均衡化效果 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 拉普拉斯算子锐化 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose P