diff --git a/src/interface.jl b/src/interface.jl
index 442de1e..75060e6 100644
--- a/src/interface.jl
+++ b/src/interface.jl
@@ -56,15 +56,15 @@ vecToDict(vec::Vector{UInt8}) = copy(JSON3.read(String(vec)))
     img_str = payload["img"]    # payload received thru mqtt
     buf = base64.b64decode(img_str)
     buffer = np.frombuffer(buf, dtype=np.uint8)
-    frame_1 = cv2.imdecode(buffer, 1)
-    frame_1_julia = pyconvert(Array, frame_1);
-    img_julia_RGB = imageUtils.np2juliaImage(frame_1_julia)
+    cv2_img = cv2.imdecode(buffer, 1)
+    julia_array_img = pyconvert(Array, cv2_img);    # resulted in julia array but in cv2-numpy's row-major BGR format
+    img_julia_RGB = np2juliaImage(julia_array_img)
 
 
     # ----------------------------- modify image here ---------------------------- #
 
 
-    img_bgr = imageUtils.juliaImg2npImg(img_julia_RGB);
+    img_bgr = juliaImg2npImg(img_julia_RGB);
     frame_2 = np.array(img_bgr)  # julia's PythonCall python-obj numpy array
 """