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you have to (re)build opencv with QT support to use those those functions.

if all you want is some text, use putText

you have to (re)build opencv with QT support to use those those functions.

if all you want is some text, use putText


oh, btw, the order of calls matters, too.

displayOverlay("horizontal", text); // first draw, imshow("horizontal", H); // then show it waitKey(someMillis); // imshow won't work without

you have to (re)build opencv with QT support to use those those functions.

if all you want is some text, use putText


oh, btw, the order of calls matters, too.

displayOverlay("horizontal", text); // first draw,
imshow("horizontal", H); // then show it
waitKey(someMillis); // imshow won't work without

without