vtk中的图片传给opencv的mat操作

一时失言乱红尘 2022-06-09 06:25 198阅读 0赞

vtkImageData* image = windowToImageFilter->GetOutput(); 
    // Check number of components. 
    const int numComponents =  image->GetNumberOfScalarComponents(); // 3
    // Construct the OpenCv Mat 
    int dims[3]; 
    image->GetDimensions(dims); 
    cv::Mat openCVImage(dims[0], dims[1], CV_8UC3, image->GetScalarPointer()); // Unsigned int, 3 channels 
    
    cvtColor(openCVImage, openCVImage, CV_BGRA2GRAY); 
    
    // Flip because of different origins between vtk and OpenCV 
    cv::flip(openCVImage,openCVImage, 0);

I think vtk is giving me the image in BGRA, so I perform a conversion from BGRA to GRAY. Doing it to RGB did not give me the expected results, but since I just need a black and white image I did not did deeper.  
If you need to keep colors, just figure out if vtk is storing the image in RGBA, BGRA or how and transform into RGB.  
网上搜了一下，用vtk得到的图像传给opencv使用，资料里说明，vtk的图像可能是RGBA的4通道，所以用转换一下成灰度图像。并且两个库得到图像的坐标也不一样，所以要对图片进行翻转操作。

再来对vtk图像进行了解，vtkChangeImageInformation可以作为管线中的一个filter来修改图像信息。利用这个filter可以修改图像的原点，像素间隔以及范围起点（extent），另外还可以对图像平移缩放等操作。【2】

参考资料：  
【1】

> [http://vtk.1045678.n5.nabble.com/From-vtkImageData-to-Iplimage-OpenCV-td5716020.html][http_vtk.1045678.n5.nabble.com_From-vtkImageData-to-Iplimage-OpenCV-td5716020.html]  
> 【2】
> 
> [http://blog.csdn.net/shenziheng1/article/details/54646862][http_blog.csdn.net_shenziheng1_article_details_54646862]

[http_vtk.1045678.n5.nabble.com_From-vtkImageData-to-Iplimage-OpenCV-td5716020.html]: http://vtk.1045678.n5.nabble.com/From-vtkImageData-to-Iplimage-OpenCV-td5716020.html
[http_blog.csdn.net_shenziheng1_article_details_54646862]: http://blog.csdn.net/shenziheng1/article/details/54646862