Question in brief: at a sensor level what are the typical causes of an unequal response between adjacent green pixels?
Background: I'm experimenting with a sensor, which is typically deployed in the camera unit of mobile phones,tablets etc, and I can see there is an imbalance between green pixels even on flat areas. It seems too localised to be caused by CFA variances, so I'm trying to understand what is causing this at a fundamental sensor level. Equally the effect seems too global to be caused by thermal noise components. My first thought was this could be caused by an imbalance in the column and row transistors that are present in a typical CMOS pinned photodiode sensor - I guess this would be a dark-signal non uniformity
Matt Grum suggests it could be PRNU - maybe you could provide more info why you think this?
Otherwise any comments, suggestions or links to further reading material would be greatly appreciated.