Force ROI for Facemark to be square

This seems to help with Facemark accuracy.

TODO.md

@@ -4,7 +4,8 @@
 - smoothing
 
 ## docs
-- model format documentation
+- getting started guide
+- demo video?
 
-## vision
-- fix worse facemark on dnn mode (maybe due to non-square roi?)
+## models
+- better default model

src/cv.cpp

@@ -83,10 +83,18 @@ void cvFrame() {
 			biggestFace = i;
 			biggestArea = iArea;
 		}
+		
+		//force ROI to be square
+		faces[i] = cv::Rect(faces[i].x + faces[i].width / 2 - faces[i].height / 2,
+				faces[i].y,
+				faces[i].height,
+				faces[i].height);
 
 		cv::rectangle (frame, faces[i], cv::Scalar (255, 255, 0));
 	}
 
+	//TODO: make a pointer to faces[biggestFace] and use that
+
 	std::vector<std::vector<cv::Point2f>> landmarks;
 
 	if (facemark->fit (frame, faces, landmarks)) {