I have an S3 I9300 since October and there were 2 times where my back-facing camera seemed to crash into a green screen, both in apps.
1st crash happened in MixBooth last month, the camera preview screen was fully green. Exiting the program and opening the official camera app seemed to fix it.
2nd crash, today, happened in Barcode Scanner. The camera preview screen turned green, with some flickering lighter-green lines. It also completely froze the device and I had to force shutdown by holding the power button.
Has yet to happen in the camera app itself, but I'm worried if it's for certain an hardware issue related to internal connections or otherwise.
Unless these happen with software glitches/crashes as well? I found a person showcasing a similar green-screen issue on the S3 (can't post link so Google for "Android Camera Preview is incorrect on Samsung Galaxy S3"). It's not quite the same green pattern, though it seems a problem encountered while developing an app that uses the camera.
Many thanks for any answer, even if it's just an opinion or conjecture.
Android version: 4.1.1
Kernel version: 3.0.31-368423