Debug Assertion Failed
Hi, I'm getting this error when i'm trying to start my program:
Debug Assertion Failed!
Program C:\Windows\system32\MSVCP110D.dll
File: c:\program files(x86)\microsoft visual studio 11.0\vc\include\xstring
Line: 1143
Expression: invalid null pointer
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#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv; using namespace std;
double alpha=1.0; int beta=10; /* contrast and brightness control */
int main( int argc, char** argv )
{
Mat image = imread( argv[1] ); // read in image file
imshow("Original Image", image);
Mat new_image = Mat::zeros( image.size(), image.type() );
//std::cout<<"* Enter alpha brighten factor [1.0-3.0]: ";std::cin>>alpha;
std::cout<<"* Enter beta contrast increase value [0-100]: "; std::cin>>beta;
// Do the operation new_image(i,j) = alpha*image(i,j) + beta
for( int y = 0; y < image.rows; y++ )
{
for( int x = 0; x < image.cols; x++ )
{
for( int c = 0; c < 3; c++ )
new_image.at<Vec3b>(y,x)[c] =
saturate_cast<uchar>( ( image.at<Vec3b>(y,x)[c] ) + beta );
}
}
namedWindow("Original Image", 1); namedWindow("New Image", 1);
imshow("Original Image", image); imshow("New Image", new_image);
waitKey(); return 0;
}
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> invalid null pointer
argv[1] is probably a nullptr.
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int main( int argc, char** argv )
{
///////////////// add this //////////////////////////
if( argc < 2 )
{
std::cerr << "usage: " << arv[0] << " path_to_image_file\n" ;
return 1 ;
}
/////////////////////////////////////////////////////
Mat image = imread( argv[1] ); // read in image file
// ...
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So, what i have to do?
Because, when I read image like this:
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Mat image = imread("Blabla.jpg");
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everything is ok.
But how can i read image by argv?
Thanks a lot.
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