在VTK帧缓冲区和OpenCV Mat数据之间转换 [英] Converting between VTK framebuffer and OpenCV Mat data

问题描述

我正在VTK中可视化数据，我想获取渲染窗口的帧缓冲区并将其显示在OpenCV应用程序中.

I am visualizing data in VTK and I want to grab the framebuffer of the renderwindow and show it in an OpenCV application.

我目前正在尝试通过以下方式进行操作:

I am currently attempting this through:

void aig::VirtualScene::Mat(cv::Mat &m) {
  typedef unsigned char pixel;
  pixel *pixels = this->window_->GetRGBACharPixelData(0, 0, this->w_, this->h_, true);
  m = cv::Mat(this->h_, this->w_, CV_8UC4, pixels);
}

但是我最终得到了失真的图像:

But I am ending up with a distorted image:

(上下颠倒，我认为这是一个 step 问题.

(both upside down and slanted, which I assume is a step issue.

此代码中是否存在明显的错误?我知道颠倒的问题是由于两个数据坐标的原点.最感兴趣的是该倾斜问题.

Is there an obvious error in this code? I know the upside down issue is because of the origin of the two data coordinates. Mostly interested in the slant issue.

推荐答案

查看GetRGBACharPixelData的定义:

virtual unsigned char *GetPixelData(int x,int y,int x2,int y2,int front);

您会看到它采用的是右上角的索引(x2，y2)，而不是子图像的 size .

You can see that it takes the index of the top-right angle (x2, y2), not the size of the subimage.

因此，您想要的是:

pixel *pixels = this->window_->GetRGBACharPixelData(0, 0, this->w_ - 1, this->h_ - 1, true);
                                                                   ^^^^         ^^^^

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