c++ - Changing brightness and contrast of an image -


please have @ following code

#include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <iostream>  using namespace std; using namespace cv;  mat change(mat m);  int main()  {     mat image = imread("c:/users/public/pictures/sample pictures/penguins.jpg");      mat copy = mat::zeros(image.size(),image.type());      mat changedimage = change(copy);      namedwindow("image");     imshow("image",changedimage);      waitkey(0); }  mat change(mat m) {     int cols = m.cols;     int rows = m.rows;      double alpha = 2.2;     int beta = 50;       for(int i=0;i<rows;i++)     {         for(int c=0;c<cols;c++)         {             m.at<vec3b>(rows,c)[0] = saturate_cast<uchar>(alpha* (m.at<vec3b>(rows,cols)[0]) + beta);             m.at<vec3b>(rows,c)[1] = saturate_cast<uchar>(alpha* (m.at<vec3b>(rows,cols)[1]) + beta);             m.at<vec3b>(rows,c)[2] = saturate_cast<uchar>(alpha* (m.at<vec3b>(rows,cols)[2]) + beta);         }     }      return m;  }

this compiles fine, when run this, following error

    opencv error: assertion failed (dims <= 2 && data && (unsigned)i0 < (unsigned)si ze.p[0] && (unsigned)(i1*datatype<_tp>::channels) < (unsigned)(size.p[1]*channel s()) && ((((sizeof(size_t)<<28)|0x8442211) >> ((datatype<_tp>::depth) & ((1 << 3 ) - 1))*4) & 15) == elemsize1()) in unknown function, file c:\opencv\build\inclu de\opencv2\core\mat.hpp, line 534

why getting this? guess have done correctly. please help.

try code.

#include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <iostream>  using namespace std; using namespace cv;  mat change(mat m);  int main() {     mat image = imread("c:/users/public/pictures/sample pictures/penguins.jpg");      mat changedimage = change(image); //modified      namedwindow("image");     imshow("image",changedimage);      waitkey(0); }  mat change(mat m) {     int cols = m.cols;     int rows = m.rows;      double alpha = 2.2;     int beta = 50;      for(int i=0;i<rows;i++)     {         for(int c=0;c<cols;c++)         {             m.at<vec3b>(i,c)[0] = saturate_cast<uchar>(alpha* (m.at<vec3b>(i,c))[0]) + beta);  //modified             m.at<vec3b>(i,c)[1] = saturate_cast<uchar>(alpha* (m.at<vec3b>(i,c))[1]) + beta);  //modified             m.at<vec3b>(i,c)[2] = saturate_cast<uchar>(alpha* (m.at<vec3b>(i,c))[2]) + beta);  //modified         }     }      return m;  }

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