OpenCV error while reszing new created window is there any other way to do it?

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cv2.namedWindow("Trackbars")
cv2.resize("Trackbars", 640 ,420)
cv2.createTrackbar("Hue Min","Trackbars",0,179,empty)

I am using this code to create and resize the new window but its showing giving me following error: what am doing wrong here ?

Overload resolution failed:

  • src is not a numpy array, neither a scalar
  • Expected Ptr<cv::UMat> for argument 'src'

what is wrong here ?

trackbar opencv python-3.x python
2 Answers

There are two slightly different ways to do this.

I would recommend changing resize to resizeWindow. cv2.WINDOW_KEEPRATIO keeps the correct ratio of an image (if you have one).

cv2.namedWindow("Trackbars", cv2.WINDOW_KEEPRATIO)
cv2.resizeWindow("Trackbar", 640, 420)

You could also resize the window in a ratio form instead of a specific pixel - this is if you have the media input as a variable (image).

cv2.resize(frame, (0,0), fx=0.4, fy=0.4)

user_156759130

cv2.resize("Trackbars", 640 ,420)
"Trackbars" is not an numpy array. Add an image here. hence src error. Use cv2.imread to read your image or from another source.
Secondly, 640, 420 should be a tuple (640,420) i.e dimensions.

user_162341740
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