diff --git a/ImageDetect/ImageDetect.cxx b/ImageDetect/ImageDetect.cxx
index 30340be..be18880 100644
--- a/ImageDetect/ImageDetect.cxx
+++ b/ImageDetect/ImageDetect.cxx
@@ -113,7 +113,7 @@ void detect_graydiff(cv::Mat img, float& CON, float& ASM, float& ENT, float& MEA
 void detect_definition(cv::Mat input_img, float& sb, float& lap, float& dev)
 {
     Mat imgGray, imgSobel, imgLap, imgDev, meanValueImage;
-    cvtColor(input_img, imgGray, CV_BGR2GRAY);
+    cvtColor(input_img, imgGray, COLOR_BGR2GRAY);
     Sobel(imgGray, imgSobel, CV_16U, 1, 1);
     Laplacian(imgGray, imgLap, CV_16U);
     meanStdDev(imgGray,meanValueImage,imgDev);