Source Code Documentation
The Below are the Code snippet of our Project:
void HandDetector::detectHands(Mat *frame, Mat *bin) {
Mat one, two;
cvtColor(*frame, one, COLOR_BGR2GRAY);
cvtColor(background, two, COLOR_BGR2GRAY);
Mat diff;
absdiff(two, one, diff);
// Convert the difference image to binary
threshold(diff, *bin, 0, 255, THRESH_BINARY | THRESH_OTSU);
std::vector> contours;
std::vector hierarchy;
findContours(*bin, contours, hierarchy, RETR_TREE, CHAIN_APPROX_SIMPLE);
// Find the contour with the largest area
double maxArea = 0;
int maxAreaIdx = -1;
for (int i = 0; i < contours.size(); i++) {
double area = contourArea(contours[i]);
if (area > maxArea) {
maxArea = area;
maxAreaIdx = i;
}
}
// Create a convex hull from the largest contour
std::vector hullIndices;
convexHull(contours[maxAreaIdx], hullIndices);
// Draw the contour on the original image
drawContours(*frame, std::vector>{contours[maxAreaIdx]}, -1, Scalar(0, 0, 255), 2);
std::vector hullPoints;
for (int i = 0; i < hullIndices.size(); i++) {
hullPoints.push_back(contours[maxAreaIdx][hullIndices[i]]);
}
Point topPoint = hullPoints[0];
for (int i = 1; i < hullPoints.size(); i++) {
if (hullPoints[i].y < topPoint.y) {
topPoint = hullPoints[i];
}
}
// Draw the convex hull on the original image
drawContours(*frame, std::vector>{hullPoints}, -1, Scalar(0, 255, 0), 2);
int verts = hullPoints.size();
// The top point's x and y coordinates can be accessed as follows:
int topX = topPoint.x;
int topY = topPoint.y;
// mouse.setCursor(topPoint.x, topPoint.y);
// mouse.click(0, true);
int count = fingerCounter.fingerCount(contours, maxAreaIdx, hullIndices, frame);
std::string text = "Top point: (" + std::to_string(topX) + ", " + std::to_string(topY) + ") "+ std::to_string(count);
// Print the text onto the frame
putText(*frame, text, Point(10, 30), FONT_HERSHEY_SIMPLEX, 1, Scalar(255, 0, 0), 2);
}
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