OpenCV Weird Memory Corruption - c++

Question

I set up OpenCV with Visual Studio for a project and I am getting these really weird memory errors. I have been searching extensively for a fix to this, and while there are many similar questions, they are either unanswered or not working for me.
This is one of the few OpenCV functions I'm having problems with (got it from docs), which replicates the errors I get:
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
using namespace cv;
using namespace std;
Mat src; Mat src_gray;
int thresh = 100;
int max_thresh = 255;
RNG rng(12345);
/** #function main */
int main(int argc, char** argv)
{
/// Load source image and convert it to gray
std::string img = "<path-to-picture>";
src = imread(img, CV_LOAD_IMAGE_COLOR);
/// Convert image to gray and blur it
cvtColor(src, src_gray, CV_BGR2GRAY);
blur(src_gray, src_gray, Size(3, 3));
/// Create Window
char* source_window = "Source";
namedWindow(source_window, CV_WINDOW_AUTOSIZE);
imshow(source_window, src);
Mat canny_output;
vector<vector<Point> > contours;
vector<Vec4i> hierarchy;
/// Detect edges using canny
Canny(src_gray, canny_output, thresh, thresh * 2, 3);
/// Find contours
findContours(canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0));
/// Draw contours
Mat drawing = Mat::zeros(canny_output.size(), CV_8UC3);
for (int i = 0; i< contours.size(); i++)
{
Scalar color = Scalar(rng.uniform(0, 255), rng.uniform(0, 255), rng.uniform(0, 255));
drawContours(drawing, contours, i, color, 2, 8, hierarchy, 0, Point());
}
/// Show in a window
namedWindow("Contours", CV_WINDOW_AUTOSIZE);
imshow("Contours", drawing);
waitKey(0);
return(0);
}
Weird thing is that findContours() works perfectly, but after that the program crashes with this error:
Expression: "(_Ptr_user & (_BIG_ALLOCATION_ALIGNMENT - 1)) == 0" && 0
Any ideas on how to fix this? Here's my OpenCV setup:
Visual Studio 2015, Debug/Release x64
OpenCV 2.4.13 (pre-built)
C++ includes points to build\include
C++ linker points to \build\x64\vc12\lib
Dependencies includes libs in the above folder.

Answer 1

You're using OpenCV build with vc12 compiler (Visual Studio 2013), but in your project you're using vc14 (Visual Studio 2105).
Be sure to use the prebuild libs compiled with vc14.
I'm sure OpenCV 3.1 has prebuild binaries for vc14. I don't know if OpenCV 2.4.13 has them, too (probably not). In this case you need to recompile OpenCV with vc14, or switch to OpenCV 3.1