Exposure mode for scanning bright phone screens
Posted: Sun May 26, 2019 10:34 pm
Hello,
I'm trying to implement QR reader as it was done by many before me.
I was somewhat successful scanning QR printed on paper, but I need to scan QR from a screen of a phone.
The camera has many exposure modes, but no matter what I choose the exposure set to have a whole picture right. After I put my phone screen in front of the camera, the screen is too bright for the exposure, since it is trying to have the exposure right for the whole image, and content of the screen is overexposed and hardly readable by QR code reader algorithm.
Is something could be done to have an exposure based on the phone's screen brightness instead of the background?
Thank you.
I'm trying to implement QR reader as it was done by many before me.
I was somewhat successful scanning QR printed on paper, but I need to scan QR from a screen of a phone.
The camera has many exposure modes, but no matter what I choose the exposure set to have a whole picture right. After I put my phone screen in front of the camera, the screen is too bright for the exposure, since it is trying to have the exposure right for the whole image, and content of the screen is overexposed and hardly readable by QR code reader algorithm.
Is something could be done to have an exposure based on the phone's screen brightness instead of the background?
Thank you.
