[ADD] added handy files

src/computervision/FaceDetector.cpp

@@ -0,0 +1,51 @@
+#include "FaceDetector.h"
+#include"opencv2\opencv.hpp"
+
+/*
+ Author: Pierfrancesco Soffritti https://github.com/PierfrancescoSoffritti
+*/
+
+Rect getFaceRect(Mat input);
+
+String faceClassifierFileName = "../res/haarcascade_frontalface_alt.xml";
+CascadeClassifier faceCascadeClassifier;
+
+FaceDetector::FaceDetector(void) {
+	if (!faceCascadeClassifier.load(faceClassifierFileName))
+		throw runtime_error("can't load file " + faceClassifierFileName);
+}
+
+void FaceDetector::removeFaces(Mat input, Mat output) {
+	vector<Rect> faces;
+	Mat frameGray;
+
+	cvtColor(input, frameGray, CV_BGR2GRAY);
+	equalizeHist(frameGray, frameGray);
+
+	faceCascadeClassifier.detectMultiScale(frameGray, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, Size(120, 120));
+
+	for (size_t i = 0; i < faces.size(); i++) {
+		rectangle(
+			output,
+			Point(faces[i].x, faces[i].y),
+			Point(faces[i].x + faces[i].width, faces[i].y + faces[i].height),
+			Scalar(0, 0, 0),
+			-1
+		);
+	}
+}
+
+Rect getFaceRect(Mat input) {
+	vector<Rect> faceRectangles;
+	Mat inputGray;
+
+	cvtColor(input, inputGray, CV_BGR2GRAY);
+	equalizeHist(inputGray, inputGray);
+
+	faceCascadeClassifier.detectMultiScale(inputGray, faceRectangles, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, Size(120, 120));
+
+	if (faceRectangles.size() > 0)
+		return faceRectangles[0];
+	else
+		return Rect(0, 0, 1, 1);
+}