getTrackbarPosBrightness
getTrackbarPos is a function in OpenCV’s HighGUI module that retrieves the current position of a trackbar created with createTrackbar in a specified window. It returns the trackbar’s value as an integer, reflecting its position within the trackbar’s defined range. The function is commonly used to query user-adjusted parameters in real time during image or video processing.
In C++: int getTrackbarPos(const string& trackbarname, const string& winname);
In C: int getTrackbarPos(const char trackbarname, const char winname);
Both versions require that the trackbar exists in the given window. If the specified trackbar or window
getTrackbarPos is typically called inside a processing loop to read the current value of a trackbar and
The function is part of a small set of trackbar utilities in HighGUI. createTrackbar initializes a trackbar
This function requires a GUI-capable OpenCV build and a running environment with display support. It is