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imshow: Assertion failed (size.width>0 && size.height>0) [closed]

asked 2015-06-23 15:01:15 -0600

Dr. Console gravatar image

updated 2015-06-23 15:02:19 -0600

Hey guys, here's the next error I encountered ... When I tried this code to test the installation:

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace cv;

int main()
    Mat image;// new blank image
    image = cv::imread("C:\\Users\XYZ\Documents\CodeBlocks\Projekte\Test\test.png", 0);// read the file
    namedWindow( "Display window", WINDOW_NORMAL );// create a window for display.
    imshow( "Display window", image );// show our image inside it.
    waitKey(0);// wait for a keystroke in the window
    return 0;

I get this error inside the app console:

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file C :\OpenCV\opencv\sources\modules\highgui\src\window.cpp, line 279 terminate called after throwing an instance of 'cv::Exception' what(): C:\OpenCV\opencv\sources\modules\highgui\src\window.cpp:279: error: ( -215) size.width>0 && size.height>0 in function imshow

This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information.

Process returned 3 (0x3) execution time : 10.086 s Press any key to continue.

The image used is the standart Win7 demo picture of a jellyfish renamed to test.png and put into the project folder.

I hope that someone can help me, maybe it's just a change from opencv 2 to 3 but I don't know.

My System is Win7, Code::Blocks 13.12 and OpenCV 3. Compiler is mingw.

NG Dr. Console

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Closed for the following reason the question is answered, right answer was accepted by Dr. Console
close date 2015-06-24 04:12:12.891086

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answered 2015-06-23 15:06:06 -0600

berak gravatar image

backslashes in fileneames...

either use forward ones:


or use double backslash (consistently):

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It is a good idea to always check for whether your image was opened. You should add a condition to check if ( image.empty() ) std::cerr << "Could not open file" << std::endl; return ( 1 ); just to avoid the exception you got.

unxnut gravatar imageunxnut ( 2015-06-23 15:22:41 -0600 )edit

Well this line throws an error at compiling XD cerr is not a member of std it says

Dr. Console gravatar imageDr. Console ( 2015-06-23 16:16:43 -0600 )edit

#include <iostream>

berak gravatar imageberak ( 2015-06-23 16:25:47 -0600 )edit

Well and in windows you have to have an eye on the filename if you reanme something, so my file was test.png.jpg and i didn't realized it -.-

Dr. Console gravatar imageDr. Console ( 2015-06-24 04:12:03 -0600 )edit

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Asked: 2015-06-23 15:01:15 -0600

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Last updated: Jun 23 '15