sebboh wrote:
i don't understand why you think focus needs to be calculated differently for OIS vs IBIS since both are doing the same thing without complete success? in both cases calculations for focus and IS should be independent (but probably phase and frequency locked).
I didn't say that focusing for OIS vs IBIS needs to be calculated differently. What I am trying to say is that the sequence or the way it is calculated will be different.
Look at it this way: for OIS it is like a moving horse rider shooting at a fixed target, while for IBIS is like a WWII bird shooting at it enemy with both moving at the same time. Which is more difficult?
Yes, the calculation for focus and IS are independent but interlaced.
hans98ko wrote:
I didn't say that focusing for OIS vs IBIS needs to be calculated differently. What I am trying to say is that the sequence or the way it is calculated will be different.
that is saying that it is calculated differently - i didn't think you were saying the CDAF algorithm was different.
hans98ko wrote:
Look at it this way: for OIS it is like a horse rider shooting at a fixed target, while for IBIS is like a WWII bird shooting at it enemy with both moving at the same time. Which is more difficult?
Yes, the calculation for focus and IS are independent but interlaced.
sorry, i'm just not understand where the difference is. from the perspective of the pixels on the sensor (which is what is used to calculate CDAF) everything is the same. things look different from the perspective of the camera body or lens, but the sensor sees the same thing assuming both IBIS and OIS are functioning equally well. if each pixel on the sensor is receiving the same photons in both cases (in our hypothetical repeatable experiment), why does the calculation need to be different?
i'm not saying your wrong necessarily, i'm just can't figure out why what your saying would be the case.
Sorry, can't explain it better in layman term and don't have all the details to post it here.
Anyway, even if I do I'll not be allowed to post it because it belongs to those companies who owns the proprietary information.
hans98ko wrote:
Sorry, can't explain it better in layman term and don't have all the details to post it here.
Anyway, even if I do I'll not be allowed to post it because it belongs to those companies who owns the proprietary information.
if you can do it in non layman's terms without violating any agreements send me a pm. i have a math degree and do quite a bit of signal processing and computer programing for my job, so i expect i ought to be able to follow it. the main issue i don't understand is why the sensor should be receiving a different image during focusing with OIS then IBIS.
incidently, don't work too hard, this is just idle curiosity. i don't care much about autofocus for my own uses.
