I adapted this code to read the white rectangle with the word 23-1965
But, it does not detect it sees a lot of other side dishes, but not what interests me. Who tells me where I'm wrong? Also attach the image to be processed
/**
* Simple shape detector program.
* It loads an image and tries to find simple shapes (rectangle, triangle, circle, etc) in it.
* This program is a modified version of `squares.cpp` found in the OpenCV sample dir.
*/
#include
#include
#include
#include
using namespace std;
/**
* Helper function to find a cosine of angle between vectors
* from pt0->pt1 and pt0->pt2
*/
static double angle(cv::Point pt1, cv::Point pt2, cv::Point pt0)
{
double dx1 = pt1.x - pt0.x;
double dy1 = pt1.y - pt0.y;
double dx2 = pt2.x - pt0.x;
double dy2 = pt2.y - pt0.y;
return (dx1*dx2 + dy1*dy2)/sqrt((dx1*dx1 + dy1*dy1)*(dx2*dx2 + dy2*dy2) + 1e-10);
}
/**
* Helper function to display text in the center of a contour
*/
void setLabel(cv::Mat& im, const std::string label, std::vector& contour)
{
int fontface = cv::FONT_HERSHEY_SIMPLEX;
double scale = 0.4;
int thickness = 1;
int baseline = 0;
cv::Size text = cv::getTextSize(label, fontface, scale, thickness, &baseline);
cv::Rect r = cv::boundingRect(contour);
cv::Point pt(r.x + ((r.width - text.width) / 2), r.y + ((r.height + text.height) / 2));
cv::rectangle(im, pt + cv::Point(0, baseline), pt + cv::Point(text.width, -text.height), CV_RGB(255,255,255), CV_FILLED);
cv::putText(im, label, pt, fontface, scale, CV_RGB(0,0,0), thickness, 8);
}
int main(int argc, char** argv)
{
//cv::Mat src = cv::imread("polygon.png");
cv::Mat src = cv::imread(argv[1]);
if (src.empty())
return -1;
// Converti in scala di grigi
cv::Mat gray;
cv::cvtColor(src, gray, CV_BGR2GRAY);
// Utilizzare Canny invece di soglia per la cattura di piazze con ombreggiatura gradiente
cv::Mat bw;
cv::Canny(gray, bw, 0, 50, 5);
// Trova contorni
std::vector> contours;
cv::findContours(bw.clone(), contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);
std::vector approx;
cv::Mat dst = src.clone();
for(unsigned int l=0;l
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