From f91b4d80cde08c4cd527d037afbaff119cd972bf Mon Sep 17 00:00:00 2001
From: Ivar Clemens <iclemens@mind-trace.com>
Date: Sat, 15 May 2021 20:37:51 +0200
Subject: [PATCH] Do conversion to grayscale after face detection.

---
 modules/face/src/facemarkLBF.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/modules/face/src/facemarkLBF.cpp b/modules/face/src/facemarkLBF.cpp
index 264ec0379..df01a2213 100644
--- a/modules/face/src/facemarkLBF.cpp
+++ b/modules/face/src/facemarkLBF.cpp
@@ -535,13 +535,14 @@ Rect FacemarkLBFImpl::getBBox(Mat &img, const Mat_<double> shape) {
 void FacemarkLBFImpl::prepareTrainingData(Mat img, std::vector<Point2f> facePoints,
     std::vector<Mat> & cropped, std::vector<Mat> & shapes, std::vector<BBox> &boxes)
 {
+    Mat shape;
+    Mat _shape = Mat(facePoints).reshape(1);
+    Rect box = getBBox(img, _shape);
+
     if(img.channels()>1){
         cvtColor(img,img,COLOR_BGR2GRAY);
     }
 
-    Mat shape;
-    Mat _shape = Mat(facePoints).reshape(1);
-    Rect box = getBBox(img, _shape);
     if(box.x != -1){
         _shape.convertTo(shape, CV_64FC1);
         Mat sx = shape.col(0);