diff --git a/samples/cpp/tutorial_code/objectDetection/objectDetection.cpp b/samples/cpp/tutorial_code/objectDetection/objectDetection.cpp new file mode 100644 index 0000000000..c24b02487f --- /dev/null +++ b/samples/cpp/tutorial_code/objectDetection/objectDetection.cpp @@ -0,0 +1,94 @@ +/** + * @file objectDetection.cpp + * @author A. Huaman ( based in the classic facedetect.cpp in samples/c ) + * @brief A simplified version of facedetect.cpp, show how to load a cascade classifier and how to find objects (Face + eyes) in a video stream + */ +#include "opencv2/objdetect/objdetect.hpp" +#include "opencv2/highgui/highgui.hpp" +#include "opencv2/imgproc/imgproc.hpp" + +#include +#include + +using namespace std; +using namespace cv; + +/** Function Headers */ +void detectAndDisplay( Mat frame ); + +/** Global variables */ +//-- Note, either copy these two files from opencv/data/haarscascades to your current folder, or change these locations +String face_cascade_name = "haarcascade_frontalface_alt.xml"; +String eyes_cascade_name = "haarcascade_eye_tree_eyeglasses.xml"; +CascadeClassifier face_cascade; +CascadeClassifier eyes_cascade; +string window_name = "Capture - Face detection"; +RNG rng(12345); + +/** + * @function main + */ +int main( int argc, const char** argv ) +{ + CvCapture* capture; + Mat frame; + + //-- 1. Load the cascades + if( !face_cascade.load( face_cascade_name ) ){ printf("--(!)Error loading\n"); return -1; }; + if( !eyes_cascade.load( eyes_cascade_name ) ){ printf("--(!)Error loading\n"); return -1; }; + + //-- 2. Read the video stream + capture = cvCaptureFromCAM( -1 ); + if( capture ) + { + while( true ) + { + frame = cvQueryFrame( capture ); + + //-- 3. Apply the classifier to the frame + if( !frame.empty() ) + { detectAndDisplay( frame ); } + else + { printf(" --(!) No captured frame -- Break!"); break; } + + int c = waitKey(10); + if( (char)c == 'c' ) { break; } + + } + } + return 0; +} + +/** + * @function detectAndDisplay + */ +void detectAndDisplay( Mat frame ) +{ + std::vector faces; + Mat frame_gray; + + cvtColor( frame, frame_gray, CV_BGR2GRAY ); + equalizeHist( frame_gray, frame_gray ); + face_cascade.detectMultiScale( frame_gray, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30) ); + + //-- Detect faces + for( int i = 0; i < faces.size(); i++ ) + { + Point center( faces[i].x + faces[i].width*0.5, faces[i].y + faces[i].height*0.5 ); + ellipse( frame, center, Size( faces[i].width*0.5, faces[i].height*0.5), 0, 0, 360, Scalar( 255, 0, 255 ), 2, 8, 0 ); + + Mat faceROI = frame_gray( faces[i] ); + std::vector eyes; + eyes_cascade.detectMultiScale( faceROI, eyes, 1.1, 2, 0 |CV_HAAR_SCALE_IMAGE, Size(30, 30) ); + + //-- In each face, detect eyes + for( int j = 0; j < eyes.size(); j++ ) + { + Point center( faces[i].x + eyes[j].x + eyes[j].width*0.5, faces[i].y + eyes[j].y + eyes[j].height*0.5 ); + int radius = cvRound( (eyes[j].width + eyes[i].height)*0.25 ); + circle( frame, center, radius, Scalar( 255, 0, 0 ), 3, 8, 0 ); + } + } + //-- Show what you got + imshow( window_name, frame ); +}