System information (version)

• OpenCV => 3.3.0
• Operating System / Platform => Windows 10 Enterprise 64 Bit
• Compiler => using opencv-python

Detailed description

Setting exposure is not working with the python wrapper for opencv, I don't know if this is related to the wrapper.

I tried to set CAP_PROP_AUTO_EXPOSURE as well to disable any auto exposure.

The camera is a HD USB Camera USB8MP02G
http://www.elpcctv.com/8mp-highdefinition-usb-camera-module-usb20-sony-imx179-color-cmos-sensor-75degree-lens-p-223.html

Steps to reproduce

I use this snippet to try to set the exposure to different values

import cv2

cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_AUTO_EXPOSURE, 0)
cap.set(cv2.CAP_PROP_EXPOSURE, -7.0)
print(cap.get(cv2.CAP_PROP_EXPOSURE))
while True:
	ret, frame = cap.read()
	cv2.imshow('test', frame)
	cv2.waitKey(1)

I can't see any difference when changing exposure