In the same situation, the camera can't capture the clear QR code, which can be solved by turning on the flash and adding other light sources.
2, strong light, even reflective phenomenon, will also cause the QR code to be unrecognizable.
Like taking pictures, the QR code should not be too bright in the photo frame.
3. The QR code is unclear or dirty. Generally, there are only two colors in the QR code, and there are other noises or dirt, which will reduce the recognition rate of the QR code.
4. Due to the air environment, the camera is easy to be contaminated with thick dust, which will also cause the camera to be unable to take clear images.
5. Most QR code scanning software needs to connect to the network. If the signal is poor, the scan may fail.
6. If the QR code cannot be scanned, there may be something wrong with the scanning software itself. Try to replace other QR code scanning software.
There are many softwares for QR code scanning, which are available in most browsers.