My program,
int main()
{
//cv::Mat src = cv::imread("polygon.png");
cv::Mat src;
cv::Mat gray;
cv::Mat bw;
cv::Mat dst;
std::vector approx;
std::vector> contours;
VideoCapture capture(0);
int q;
while (cvWaitKey(30) != 'q')
{
capture >> src;
if (true)
{
// Convert to grayscale
cv::cvtColor(src, gray, CV_BGR2GRAY);
// Use Canny instead of threshold to catch squares with gradient shading
blur(gray, bw, Size(3, 3));
cv::Canny(gray, bw, 80, 240, 3);
cv::imshow("bw", bw);
//cv::bitwise_not(bw, bw);
// Find contours
cv::findContours(bw.clone(), contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);
src.copyTo(dst);
for (int i = 0; i < contours.size(); i++)
{
// Approximate contour with accuracy proportional
// to the contour perimeter
cv::approxPolyDP(cv::Mat(contours[i]), approx, cv::arcLength(cv::Mat(contours[i]), true)*0.02, true);
// Skip small or non-convex objects
if (std::fabs(cv::contourArea(contours[i])) < 100 || !cv::isContourConvex(approx))
continue;
..................
Facing the problem in the for loop when i=1 and breaks at point cv::approxPolyDP().
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