fixed comments

modules/v4d/samples/nanovg-demo.cpp

@@ -127,9 +127,9 @@ static bool iteration() {
     static cv::UMat hsv;
     static cv::UMat hueChannel;
 
-    //we use frame count to calculated the current hue
+    //we use frame count to calculate the current hue
     float t = window->frameCount() / 60.0;
-    //nanovg hue fading depending t
+    //nanovg hue fading depending on t
     float hue = (sinf(t * 0.12f) + 1.0f) * 127.5;
 
     if (!window->capture())
@@ -167,7 +167,6 @@ static bool iteration() {
 
     window->write();
 
-    //If onscreen rendering is enabled it displays the framebuffer in the native window. Returns false if the window was closed.
     return window->display();
 }
 

modules/v4d/samples/video-demo.cpp

@@ -3,7 +3,7 @@
 // of this distribution and at http://opencv.org/license.html.
 // Copyright Amir Hassan (kallaballa) <amir@viel-zu.org>
 
-/**
+/*
  * Based on cube-demo. Only differs in two points:
  * - Uses a source to read a video.
  * - Doesn't clear the background so the cube is rendered on top of the video.

modules/v4d/tutorials/16-optflow.markdown

@@ -8,7 +8,7 @@
 | Original author | Amir Hassan (kallaballa) <amir@viel-zu.org> |
 | Compatibility | OpenCV >= 4.7 |
 
-Optical flow visualization on top of a video. Uses background subtraction (OpenCV/) to isolate areas with motion, detects features to track (OpenCV), calculates the optical flow (OpenCV), uses nanovg for rendering (OpenGL) and post-processes the video (OpenCV/).
+Optical flow visualization on top of a video. Uses background subtraction (OpenCV) to isolate areas with motion, detects features to track (OpenCV), calculates the optical flow (OpenCV), uses nanovg for rendering (OpenGL) and post-processes the video (OpenCV).
 
 \htmlinclude "../samples/example_v4d_optflow-demo.html"