Qt：捕获图像而不保存 - QCameraImageCapture [英] Qt: Capture image without saving - QCameraImageCapture

问题描述

我在使用OpenCV和QCamera之间的一个项目我正在工作。

I was torn between using OpenCV and QCamera for a project I'm working on.

基本上我想让用户输入他们想要捕获多少帧，然后相机将采用应用了使用CUDA和CPU实现编写的高斯滤波器的那个数量的图像。

Basically I want a user to input how many frames they want to capture, the camera will then take that amount of images applying a Gaussian filter I have written with both a CUDA and CPU implementation.

然后，数据被返回并放入图形中，所以I可以分析性能差异。

Data is then returned and put into a graph so I can analyse the performance difference.

我已经设置了大部分的应用程序，但我在最后的障碍，我创建了一个 QCameraViewFinder ， QCameraImageCapture 和 QCamera 对象。在我的while循环中，我然后调用以下代码：

I have set most of my application up, but I'm struggling at the final hurdle, I have created a QCameraViewFinder, QCameraImageCapture and QCamera object. In my while loop I am then calling the following code:

do
    {
       imageCapture->capture();

       //cpu method call here

       // Emit the frame number from the thread back to GUI for update
       emit frameProcessed(QString::number(currFrame));

       currFrame++;
       frames--;
} while(frames > 0);

如何提取 imageCapture-> capture创建的图像不保存到我的机器？我关心的唯一数据是函数需要计算的时间（以毫秒为单位），因此不必保存原始图像数据。

How would I extract the image created by imageCapture->capture without saving it to my machine? The only data I am concerned with is the time in ms that the functions take to compute, so saving the raw image data is not necessary.

推荐答案

1. 确保缓冲区目标是支持的：

1. Make sure that the buffer destination is supported:

imageCapture.
  isCaptureDestinationSupported(QCameraImageCapture::CaptureToBuffer)

如果是这样，请设置缓冲目标，和缓冲区格式和分辨率等。

If so, set the buffer destination, and buffer format and resolution, etc.

最后，在连接到 QVideoFrame&）信号。

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