OpenCV Error: Assertion failed (size.width>0 && size.height>0) simple code

问题:

I am trying to run this simple OpenCV program, but i got this error:

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file .../opencv/modules/highgui/src/window.cpp, line 276 

Code:

#include  #include   using namespace std;  int main() {     cout 

What's the cause of this error?

回答1:

This error means that you are trying to show an empty image. When you load the image with imshow, this is usually caused by:

1. The path of your image is wrong (in Windows escape twice directory delimiters, e.g. imread("C:\path\to\image.png") should be: imread("C:\\path\\to\\image.png"), or imread("C:/path/to/image.png"));
2. The image extension is wrong. (e.g. ".jpg" is different from ".jpeg");
3. You don't have the rights to access the folder.

A simple workaround to exclude other problems is to put the image in your project dir, and simply pass to imread the filename (imread("image.png")).

Remember to add waitKey();, otherwise you won't see anything.

You can check if an image has been loaded correctly like:

#include  #include  using namespace cv;  int main() {     Mat3b img = imread("path_to_image");      if (!img.data)     {         std::cout 

回答2:

I had the exact same problem, only in Raspbian. After hours of trying, the solution was pretty simple, I had to leave out the file extension.

#include  #include   using namespace std; using namespace cv; int main() {     Mat inputImage = imread("beniz1");     imshow("Display Image", inputImage);     waitKey(5000);      return 0; } 

回答3:

Usually it means that your image is not there, it's a basic assertion for checking if the content is displayable in the window before actually displaying it, and by the way you need to create a window in order to show the image namedWindow( "name") then imshow ("name", image);

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