diff --git a/opencv/cv.go b/opencv/cv.go
index c41ddcc..2e5e689 100644
--- a/opencv/cv.go
+++ b/opencv/cv.go
@@ -23,7 +23,11 @@ const (
 	CV_BGR2BGRA  = C.CV_BGR2BGRA
 	CV_RGBA2BGRA = C.CV_RGBA2BGRA
 
-	CV_BLUR = C.CV_BLUR
+	CV_BLUR_NO_SCALE = C.CV_BLUR_NO_SCALE
+	CV_BLUR          = C.CV_BLUR
+	CV_GAUSSIAN      = C.CV_GAUSSIAN
+	CV_MEDIAN        = C.CV_MEDIAN
+	CV_BILATERAL     = C.CV_BILATERAL
 
 	CV_8U  = C.CV_8U
 	CV_8S  = C.CV_8S