error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'
时间: 2023-09-29 12:03:20 浏览: 61
This error occurs when the input image, '_src', is empty or null. The cvtColor function in OpenCV requires a non-empty input image to perform color conversion.
To resolve this error, you should check if the input image is empty or null before passing it to the cvtColor function. You can use the empty() function in OpenCV to check if the image is empty or not.
Here is an example code snippet that demonstrates how to check for an empty input image:
```
cv::Mat inputImage = cv::imread("image.jpg");
if (inputImage.empty()) {
std::cout << "Error: Input image is empty or null!" << std::endl;
return -1;
}
// Perform color conversion using cvtColor function
cv::Mat outputImage;
cv::cvtColor(inputImage, outputImage, cv::COLOR_BGR2GRAY);
```
In this example, we first read an input image using imread function and then check if it is empty or not using the empty() function. If the input image is empty, we print an error message and return from the function. If the input image is not empty, we proceed with the color conversion using cvtColor function.
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