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Vein Authentication Technology Reads Palm Veins

Posted February 03, 2017 12:00 AM by Engineering360 eNewsletter

Fujitsu Laboratories Ltd. reportedly developed the world's first slide-style palm vein authentication technology. This technology is compact enough to be equipped to future tablets and other handheld mobile devices. For some time, making the optical unit smaller had been difficult. 


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#1

Re: Vein Authentication Technology Reads Palm Veins

02/03/2017 11:59 AM

If they can reliably detect the vein pattern and this pattern is sufficiently unique to each individual, this has an advantage over fingerprint sensors: you don't leave a copy of your vein pattern on everything you touch.

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#2
In reply to #1

Re: Vein Authentication Technology Reads Palm Veins

02/03/2017 2:08 PM

Hack proof? I would not be too sure...just sayin'

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#3
In reply to #2

Re: Vein Authentication Technology Reads Palm Veins

02/03/2017 10:09 PM

Probably nothing is hack proof, but maybe it won't be so easy...

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#4
In reply to #1

Re: Vein Authentication Technology Reads Palm Veins

02/03/2017 11:30 PM

When they say the vein pattern, are they referring to the wrinkles, or to blood vessels? The wrinkles can be seen with visible light, but I think the veins would require infrared.

In fact, I just took an infrared photo of my palm:

I sure don't see enough information there to identify me, so I presume they must be talking about the wrinkles.

But what is the deal about the optics? the built-in camera should be able to see the palm just fine. Now when they said "slide" , maybe they are talking about sliding the palm past a linear sensor array...

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#5
In reply to #4

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 8:53 AM

Blood vessels within the palm (other body parts can be used as well; it doesn't have to be your palm). Fujitsu states that its technology maps only the blood vessels carrying oxygen-depleted blood as these blood vessels absorb PalmSecure's near-infrared light (760 nm) and so look darker than the surrounding tissue. As NIR absorption varies as the heart beats, the tech cannot be fooled by using cadavers* or photos as the subject must have a pulse.

FLIR depends on much longer wavelengths more indicative of bulk temperature. As blood vessels are roughly the same temperature as the surrounding tissue, they don't show up as readily.

-----

* PalmSecure's tech is also used in secure-area access control. I wouldn't expect cadavers to be trying to break into your phone. That would happen only during the Zombie Apocalypse and by then you would probably have more pressing problems.

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#6
In reply to #5

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 10:47 AM

Thanks for the link, although that article is almost 9 years old!

I'm still not quite understanding it! If it depends on absorption of near IR, then either it must depend on the veins near the surface absorbing the energy coming from deeper in the body, or it must emit its own light and measure the reflections. Perhaps the latter is why it's been difficult to reduce the size of the sensor...

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#8
In reply to #6

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 3:09 PM

This whitepaper is a little more up-to-date, but it's the same idea: the device illuminates the scan area with NIR light and looks at what gets reflected back. Vessels near the surface tend to reflect less NIR light than the surrounding (somewhat translucent) tissue.

What model of FLIR camera are you using?

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#11
In reply to #8

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 10:51 PM

It's the FLIR-One, an attachment to my iPhone 6. It has served extremely well, leading to savings of tens of thousands of dollars for our company in the year or so I've had it, locating overheated electrical electric cables leading to defective devices, especially air compressors, among other things.

There is a similar unit available for Android phones.

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#12
In reply to #11

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 11:59 PM

Ah, okay. Thanks.

Apparently the FLIR One is most sensitive to wavelengths in the range 8 to 14 μm (8000 - 14000 nm). Deep IR.

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#10
In reply to #6

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 3:17 PM

Infrared LEDs emit in this region and they are looking at the reflectance of the veins.

A body does not emit near infrared unless it is almost hot enough to glow red. (The human body is about 300 K.)

As a body gets hotter the peak emission wavelength becomes shorter and the amount of radiation increases. The peak emission wavelength is proportional to 1/T. The power is proportional to T4 .

The human body radiates at about 5 microns. The infrared LED source is about 0.76 microns.

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#7
In reply to #4

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 3:05 PM

Your picture looks more like heat or far infrared (~10 microns). I'm thinking they use near infrared, (~1 micron or 1000 nm).

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#9
In reply to #7

Re: Vein Authentication Technology Reads Palm Veins

02/04/2017 3:11 PM

PalmSecure uses 760 nm.

Previous models used the range 390 to 700 nm but often generated spurious results.

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