怎么使用Python VTK完成图像切割

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1、读取二维图片序列完成面绘制

详情见Python-VTK批量读取二维切片并显示三维模型

2、vtk.vtkOutlineFilter()介绍

这个空间就相当于生成渲染模型的轮廓线，比如三维图像大小为（256x256x200），那么这个控件就会生成一个长宽高分别为256x256x200的一个长方体框架

详细介绍：VTK官方文档

3、隐函数平面模块vtk.vtkImplicitPlaneWidget()

使用该模块可以灵活的调整需要选取的平面 vtkImplicitPlaneWidget官方文档

4、vtk.vtkClipPolyData()

vtkclippolydata的剪切结果，根据切平面法线分为上下两部分，接口中有相应的输出接口

vtkClipPolyData官方文档

切割效果展示

代码如下:

import vtkdef main():    arender = vtk.vtkRenderer()    arender.SetViewport(0, 0.0, 0.5, 1.0)    renWin = vtk.vtkRenderWindow()    renWin.AddRenderer(arender)    iren = vtk.vtkRenderWindowInteractor()    iren.SetRenderWindow(renWin)    # Reader = vtk.vtkMetaImageReader()    # Reader.SetFileName("bbb.mhd")    # Reader.Update()#读取图片、面绘制    Reader = vtk.vtkPNGReader()    Reader.SetNumberOfScalarComponents(1)    Reader.GetOutput().GetOrigin()    Reader.SetDataByteOrderToLittleEndian()    Reader.SetFileDimensionality(3)    Reader.SetDataExtent(0, 512, 0, 512,0, 226)    Reader.SetFilePrefix("E:/qct_data/in_out_data/in_data/inner/label/22/")    #Reader.SetFilePrefix("C:/Users/deng5/Desktop/2/48/")    Reader.SetFilePattern("%s%d.png")    Reader.SetDataSpacing(1, 1, 1)  # Volume Pixel    Reader.Update()    #面绘制代码，详情见使用python-vtk完成面绘制文章    skinExtractor = vtk.vtkContourFilter()    skinExtractor.SetInputConnection(Reader.GetOutputPort())    skinExtractor.SetValue(0, 1)    skinExtractor.ComputeGradientsOn();    skinExtractor.ComputeScalarsOn();    smooth = vtk.vtkSmoothPolyDataFilter()    smooth.SetInputConnection(skinExtractor.GetOutputPort())    smooth.SetNumberOfIterations(100)    skinNormals = vtk.vtkPolyDataNormals()    skinNormals.SetInputConnection(smooth.GetOutputPort())    skinNormals.SetFeatureAngle(50)    skinStripper = vtk.vtkStripper()    skinStripper.SetInputConnection(skinNormals.GetOutputPort())    skinMapper = vtk.vtkPolyDataMapper()    skinMapper.SetInputConnection(skinStripper.GetOutputPort())    skinMapper.ScalarVisibilityOff()    skin = vtk.vtkActor()    skin.SetMapper(skinMapper)#定义一个图像边界控件    outlineData = vtk.vtkOutlineFilter()    outlineData.SetInputConnection(Reader.GetOutputPort())    mapOutline = vtk.vtkPolyDataMapper()    mapOutline.SetInputConnection(outlineData.GetOutputPort())    outline = vtk.vtkActor()    outline.SetMapper(mapOutline)    outline.GetProperty().SetColor(0, 0, 0)    aCamera = vtk.vtkCamera()    aCamera.SetViewUp(0, 0, -1)    aCamera.SetPosition(0, 1, 0)    aCamera.ComputeViewPlaneNormal()    aCamera.Azimuth(30.0)    aCamera.Elevation(30.0)    aCamera.Dolly(1.5)    arender.AddActor(outline)    arender.AddActor(skin)    #splineActor.GetProperty().SetLineWidth(5)    #arender.AddActor(splineActor)    #arender.AddActor(pointActor)    arender.SetActiveCamera(aCamera)    arender.ResetCamera()    arender.SetBackground(.2, .3, .4)    arender.ResetCameraClippingRange()    renWin.SetSize(1000, 1000)    style = vtk.vtkInteractorStyleTrackballCamera()    iren.SetInteractorStyle(style);#定义切割器    global cliper    cliper = vtk.vtkClipPolyData()    cliper.SetInputData(skinStripper.GetOutput())#定义平面隐函数    implicitPlaneWidget = vtk.vtkImplicitPlaneWidget()    implicitPlaneWidget.SetInteractor(iren)    implicitPlaneWidget.SetPlaceFactor(1.25)    implicitPlaneWidget.SetInputData(skinStripper.GetOutput())    implicitPlaneWidget.PlaceWidget()    global coneSkinActor    coneSkinActor = vtk.vtkActor()    coneSkinActor.SetMapper(skinMapper)    rRenderer = vtk.vtkRenderer()    rRenderer.SetBackground(0.2, 0.3, 0.5)    rRenderer.SetViewport(0.5, 0.0, 1.0, 1.0)    coneSkinActor.RotateZ(90)    rRenderer.AddActor(coneSkinActor)    renWin.AddRenderer(rRenderer)    #关联CallBack函数    implicitPlaneWidget.AddObserver("EndInteractionEvent", my_call_back)    implicitPlaneWidget.On()    renWin.Render()    iren.Initialize()    iren.Start()#CallBack函数def my_call_back(pWidget,ev):#表示当pWidget控件改变时，触发函数    if (pWidget):        print(pWidget.GetClassName(), "Event Id:", ev)        planeNew = vtk.vtkPlane()        #获得pWidget中的平面，将平面值赋值planeNew        pWidget.GetPlane(planeNew)        #cliper将裁剪器cliper的平面设置为planeNew        cliper.SetClipFunction(planeNew)        planeNew.GetNormal()        cliper.Update();        #将裁减后的模型传递给另一个窗口        clipedData = vtk.vtkPolyData()        clipedData.DeepCopy(cliper.GetOutput())        coneMapper = vtk.vtkPolyDataMapper()        coneMapper.SetInputData(clipedData)        coneMapper.ScalarVisibilityOff()        coneSkinActor.SetMapper(coneMapper)        print("Plane Normal = "+str(planeNew.GetNormal()))        print("Plane Origin = "+str(planeNew.GetOrigin()))        main()

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