OpenCV capturing image with black side bars
I had this exact issue with a Logitech wide angle in windows camera and I was wondering about a driver problem.
So I solved it using the DirectShow driver instead of the native driver using this:
If you have more than one camera add the index to that value like this
cv2.VideoCapture(cv2.CAP_DSHOW + camera_index)
It will accept the desired resolution by applying the right aspect ratio without having the sidebars.
The Answer of @luismesas is completely right and worked for me.
But for people being as unskilled as I am you need to save the capture returned by cv2.VideoCapture. It is not a Parameter you can set like cv2.VideoCapture(cv2.CAP_DSHOW), it is a method.
camera_index = 0 cap = cv2.VideoCapture(camera_index, cv2.CAP_DSHOW) ret, frame = cap.read()
Confirmed on Webcam device HD PRO WEBCAM C920.
I had the same issue too, but only on Windows 10, OpenCV 3.4 and Python 3.7. I get the full resolution without the black side bars on a Mac OS.
I used PyGame to capture the webcam input and got the full resolution of 1920x1080 on Windows.