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Touch ID or thumbs' bug?

T

thanpag

macrumors newbie
Original poster
Sep 22, 2014
8
0
A colleague of mine bought a new iPhone 6 and he asked me how come both of his thumbs work perfectly on touch ID even tough he had scanned and registered only his right one. I tried it on my iPhone 6 and it doesn't work; I have to scan and register both my left and right thumbs individually. Are his thumbs uniquely identical or any of you had a similar experience?

https://youtu.be/hv8U_dhbI0c
 
Newtons Apple said:
OR your friend is pulling your leg!:eek:
Click to expand...

OR pulling a finger

want-cheap-gas-pull-my-finger.jpg
 
it's possible when setting up his right thumb he either purposefully or accidentally placed his left thumb on the reader.

When you are with him have him remove all fingers from Touch ID and setup the thumb again.
 
I believe iOS doesn't allow to mix fingures up during the scanning and registration process. Let's try it out though; video comming up
 
It does indeed! Do you think this is normal? Should it distinguishes between fingers...? If not, why the 5 finger slots in the options???

Two finger mix
https://youtu.be/CJDRu2nXfjs

Three finger mix
https://youtu.be/ZdU8wCDjx6k
 
Last edited:
Using two fingers works by design. During the registration process you are told to shift your grip and resume. This has to be done to allow for different angles of the finger during a scan. A different angle makes a significantly different print from a static readers standpoint.
 
Where is it stated that two fingers work by design? As you are correctly pointing out, the different angles registration improves the recognition success rate of each of the scanned fingers.
 
thanpag said:
Where is it stated that two fingers work by design? As you are correctly pointing out, the different angles registration improves the recognition success rate of each of the scanned fingers.
Click to expand...

The works by design phrase is my opinion. It seems to me that from a static readers point of view that two different angles are nearly as different as two different fingers. I could be wrong though. Just thinking aloud.
 
thanpag said:
It does indeed! Do you think this is normal? Should it distinguishes between fingers...? If not, why the 5 finger slots in the options???

Two finger mix
https://youtu.be/CJDRu2nXfjs

Three finger mix
https://youtu.be/ZdU8wCDjx6k
Click to expand...

No way the phone knows what finger or thumb you are registering. How would it? The graphic you see is for us humans to keep track of what we have registered, the phone could care less.
 
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