error: ‘cvwaitKey’ was not declared in this scope char c = cvwaitKey(20);这是什么
时间: 2023-05-29 10:02:23 浏览: 147
这个错误是因为在当前的作用域中未定义cvwaitKey函数。可能是因为您没有包含相关的头文件或命名空间。解决方法是包含正确的头文件并使用正确的命名空间。在OpenCV 4之前,使用cvWaitKey而不是cvwaitKey。可以尝试使用以下代码:
```c++
#include <opencv2/opencv.hpp>
using namespace cv;
int main() {
Mat image = imread("image.jpg", IMREAD_GRAYSCALE);
imshow("Image", image);
int key = waitKey(0);
return 0;
}
```
这里使用了`waitKey`而不是`cvwaitKey`,因为OpenCV 4已经更改了函数名称。
相关问题
error: ‘CV_RGB’ was not declared in this scope
This error typically occurs when the OpenCV library is not properly included or if the code is using an outdated version of OpenCV.
To resolve the error, make sure that the OpenCV library is properly installed and included in the project. You can also try using a different color definition such as Scalar(255, 0, 0) instead of CV_RGB(255, 0, 0).
error: ‘CV_WINDOW_FREERATIO’ was not declared in this scope
This error message typically occurs when the code is trying to use the constant "CV_WINDOW_FREERATIO" in a scope where it is not defined.
To resolve this error, you may need to include the appropriate header file that declares the constant. For example, if you are using OpenCV, you may need to include the "opencv2/highgui/highgui.hpp" header file.
Alternatively, you may need to check if the constant is spelled correctly and if it is available in the version of the library you are using.
If you are still having trouble resolving the error, please provide more context and code snippets so that we can better assist you.
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