使用Python VTK 完成图像切割

目录

• 1、读取二维图片序列完成面绘制
• 2、vtk.vtkOutlineFilter()介绍
• 3、隐函数平面模块vtk.vtkImplicitPlaneWidget()
• 4、vtk.vtkClipPolyData()
• 切割效果展示

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 vtk

def 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()

到此这篇关于使用Python VTK 完成图像切割的文章就介绍到这了,更多相关Python VTK图像切割内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！