Revert to Default Camera Settings

edit

you can solve this problem by using windows camera app.

plug in the usb cam you have and click Windows icon ->search->Camera

if you see the clean video, the usb cam settings are all reverted to the beginning.

hope this answer would be helpful to everyone.

Hi. If you ask about MS Windows then all camera controls are managed through DirectShow and you can enable/disable all automatic adjustments through the device settings dialog. To open this dialog use:

#include <opencv/opencv2.hpp>
...
cv::VideoCapture _videocap;
if( _videocap.open( _camid ) ) {
   while(true) {    
        // Paste processing code here    
        int c = cv::waitKey(1); //enroll user's input
        // escape key code, if the user has pressed escape then break loop
        if( (char)c == 27 ) 
            break;
        else switch(c) {
            case 's':
                // if the user has pressed key 's' open device settings dialog
                capture.set(CV_CAP_PROP_SETTINGS,0.0); 
                break;
        }    
   }
}