VTK将窗口图像渲染为numpy数组
问题描述：
在VTK中，我可以使用以下代码片段将渲染窗口另存为图像.但是，实际上，我想直接将其作为一个numpy数组获取(无需编写然后读取).
In VTK I am able to use the following snippet to save the render window as an image. However, actually I want to get it directly as a numpy array (without writing then reading).
im = vtkWindowToImageFilter()
writer = vtkPNGWriter()
im.SetInput(renderWindow)
im.Update()
writer.SetInputConnection(im.GetOutputPort())
writer.SetFileName("file.png")
writer.Write()
做到这一点的最佳方法是什么?
What is the best way to do this?
答
我相信没有必要涉及vtkXWriter(其中X是某种格式)，除非您需要X格式的数据.在定义了要从中导出其内容作为图像的窗口之后，您可以继续获取VTK图像并对其进行处理.
I believe there is no need to involve vtkXWriter (where X is some format), except if you need the data in the X format. After you define the window from which you want to export its contents as an image, you can proceed to get a VTK image and work with that.
from vtk.util.numpy_support import vtk_to_numpy
...
vtk_rw = vtk.vtkRenderWindow()
...
vtk_win_im = vtk.vtkWindowToImageFilter()
vtk_win_im.SetInput(vtk_rw)
vtk_win_im.Update()
vtk_image = vtk_win_im.GetOutput()
width, height, _ = vtk_image.GetDimensions()
vtk_array = vtk_image.GetPointData().GetScalars()
components = vtk_array.GetNumberOfComponents()
arr = vtk_to_numpy(vtk_array).reshape(height, width, components)
...