CODEWITHSUNDEEP
pythonc++opencvimage-processing
user6544508
user6544508

Reputation:

How to make buttons in OpenCV 3.1 using cv2.createButton?

I'm trying to add a button to my image processing script to save the high and low HSV values for my binary threshold.

According to the OpenCV 3.0 documentation here, OpenCV evidently has a function which does that.

I am writing the function like this
cv2.createButton('Button',f)
Where Button is the name of the button and f is the callback function (just an empty function)

However I keep on getting:-

AttributeError: 'module' object has no attribute 'createButton'

Apparently the same function works fine with C/C++ but it isn't working with python. Most probably because it isn't there for python (maybe) ?

How do I get around this problem?

Upvotes: 8

Views: 35854

Answers (4)

arun chand
arun chand

Reputation: 56

I was searching for the reason why the button was getting attached to the control panel of QT window. I think the following extract from CV2 home page would help

The function createButton attaches a button to the control panel. Each button is added to a buttonbar to the right of the last button. A new buttonbar is created if nothing was attached to the control panel before, or if the last element attached to the control panel was a trackbar or if the QT_NEW_BUTTONBAR flag is added to the type

open cv new qt functions page link

Upvotes: 1

helloworld12345
helloworld12345

Reputation: 127

cv2.namedWindow("Frame")
cv2.createButton("Back",back,None,cv2.QT_PUSH_BUTTON,1)

def back(*args):
    pass

The above code shows how to implement the cv2.createButton() method.

Notes:

  • "Back" = text displayed on the button
  • back = function called when the button is pressed
  • the cv2 window must be created before the button
  • if your button is not appearing: click inside the frame, press ctrl+p or command+p (for mac) and the button menu should appear

Upvotes: 7

Stas Vasin
Stas Vasin

Reputation: 527

I think it's unposible

    cv2.createButton('test', GeekObject, None , cv2.QT_PUSH_BUTTON, 0)

cv2.error: OpenCV(3.4.6) C:\projects\opencv-python\opencv\modules\highgui\src\window.cpp:579: error: (-213:The function/feature is not implemented) The library is compiled without QT support in function 'cv::createButton'

Upvotes: 1

ppasler
ppasler

Reputation: 3719

The documentation says

Another important application of trackbar is to use it as a button or switch. OpenCV, by default, doesn’t have button functionality. So you can use trackbar to get such functionality (found at Trackbar as the Color Palette).

There is a small example how to use it as button.

Upvotes: 10

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