opencv从相机数据创建垫 [英] opencv create mat from camera data

问题描述

在我的程序我有一个功能，它从相机的图像，应该包装所有的数据 OpenCV Mat 结构。从相机我得到宽度，高度和 unsigned char * 到图像缓冲区。我的问题是如何可以从这些数据创建Mat，如果我有全局Mat变量。 Mat结构的类型为CV_8UC1。

  Mat image_; 
 
 function takePhoto（）{
 unsigned int width = getWidthOfPhoto（）; 
 unsinged int height = getHeightOfPhoto（）; 
 unsinged char * dataBuffer = getBufferOfPhoto（）; 
 Mat image（Size（width，height），CV_8UC1，dataBuffer，Mat :: AUTO_STEP）; 
 
 printf（width：％u\\\
，image.size（）。width）; 
 printf（height：％u\\\
，image.size（）。height）; 
 
 image_.create（Size（image.size（）。width，image.size（）。height），CV_8UC1）; 
 image_ = image.clone（）; 
 
 printf（width：％u\\\
，image_.size（）。width）; 
 printf（height：％u\\\
，image_.size（）。height）; 
} 
  

当我测试我的程序时，我得到 width ，和 height ，但宽度和高度的全局Mat image _ 是 0 。

谢谢你。

$ b如果我在全局 Mat 不幸的是， clone（）或 copyTo（） code>将width / height的值复制到另一个Mat。至少在OpenCV 2.3！

但是，你可以通过使函数返回 Mat 。这种方式你不需要有一个全局变量：

  Mat takePhoto（）
 {
 unsigned int width = getWidthOfPhoto（）; 
 unsigned int height = getHeightOfPhoto（）; 
 unsigned char * dataBuffer = getBufferOfPhoto（）; 
 Mat image（Size（width，height），CV_8UC1，dataBuffer，Mat :: AUTO_STEP）; 
 return Mat; 
} 
 
 int main（）
 {
 Mat any_img = takePhoto（）; 
 printf（width：％u\\\
，any_img.size（）。width）; 
 printf（height：％u\\\
，any_img.size（）。height）; 
} 
  




in my programm I have function that takes the image from camera and should pack all data in OpenCV Mat structure. From the camera I get width, height and unsigned char* to the image buffer. My Question is how I can create Mat from this data, if I have global Mat variable. The type for Mat structure I took CV_8UC1.

Mat image_;

function takePhoto() {
    unsigned int width = getWidthOfPhoto();
    unsinged int height = getHeightOfPhoto();
    unsinged char* dataBuffer = getBufferOfPhoto();
    Mat image(Size(width, height), CV_8UC1, dataBuffer, Mat::AUTO_STEP);

    printf("width: %u\n", image.size().width);
    printf("height: %u\n", image.size().height);

    image_.create(Size(image.size().width, image.size().height), CV_8UC1);
    image_ = image.clone();

    printf("width: %u\n", image_.size().width);
    printf("height: %u\n", image_.size().height);
}

When I test my program, I get right width and height of image, but width and height of my global Mat image_ is 0. How I can put the data in my global Mat varible correctly?

Thank you.

解决方案

Unfortunately, neither clone() nor copyTo() successfully copy the values of width/height to another Mat. At least on OpenCV 2.3! It's a shame, really.

However, you could solve this issue and simplify your code by making the function return the Mat. This way you won't need to have a global variable:

Mat takePhoto() 
{
    unsigned int width = getWidthOfPhoto();
    unsigned int height = getHeightOfPhoto();
    unsigned char* dataBuffer = getBufferOfPhoto();
    Mat image(Size(width, height), CV_8UC1, dataBuffer, Mat::AUTO_STEP);
    return Mat;
}

int main()
{
    Mat any_img = takePhoto();
    printf("width: %u\n", any_img.size().width);
    printf("height: %u\n", any_img.size().height);
}

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