Opencv learning notes (2) -- cvcreatetrackbar

Int cvcreatetrackbar (

Const char * trackbar_name, // The name of the slider

Const char * window_name, // window name. The slider does not block the image.

Int * value, // when the slider is dragged, opencv will automatically pass the value represented by the current position to the integer pointed to by the pointer

Int count, // maximum value that a slider can reach

Cvtrackbarcallback on_change // optional callback function. For the callback function, see http://wapedia.mobi/zhtrad/callback function.

);

 

The highgui library of opencv provides two functions to read and set the value of the scroll bar.

// Read the value

Int cvgettrackbarpos (

Const char * trackbar_name,

Cosnt char * window_name

);

// Set the value

Void cvsettrackbarpos (

Const char * trackbar_name,

Const char * window_name,

Int POS

);