Closed papermache closed 4 years ago
boltgolt
commented
4 years ago Although i like the idea, Howdy is made to be a replacement for laptops that support Windows Hello and which normally do not have a thermal imaging camera. Closing as out of scope, but only because the required hardware just isn't there.
papermache
commented
4 years ago Does false color require special hardware or is the IR emitter sufficient?
On Mon, Nov 11, 2019, 8:49 AM boltgolt notifications@github.com wrote:
Closed #264 https://github.com/boltgolt/howdy/issues/264.
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boltgolt
commented
4 years ago In this case the image returned from the camera is only in black and white, there is no exposed thermal data
papermache
commented
4 years ago I think if you assign colors to different shades of grey received by heat from the IR emitter false color adds in so no special hardware is required.
https://github.com/fk128/falseColor
On Mon, Nov 11, 2019, 1:23 PM boltgolt notifications@github.com wrote:
In this case the image returned from the camera is only in black and white, there is no exposed thermal data
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boltgolt
commented
4 years ago That's not reliable though, a well printed picture on a piece of paper will have more or less the same IR image as a real human. We're shining IR light on the subject through the emitters and then measuring how much of the light gets reflected back, it has very little to do with how much IR radiation the subject itself is emitting
papermache
commented
4 years ago Can the colors therefore be assigned by the reflected light instead of heat?
On Mon, Nov 11, 2019, 1:38 PM boltgolt notifications@github.com wrote:
That's not reliable though, a well printed picture on a piece of paper will have more or less the same IR image as a real human. We're shining IR light on the subject through the emitters and then measuring how much of the light gets reflected back, it has very little to do with how much IR radiation the subject itself is emitting
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boltgolt
commented
4 years ago We could, but it would not be effective in determining if a subject is alive or not, and thus not help prevent picture spoofing. We would be adding false colors to both real humans and pictures and the difference would not be noticeable.
papermache
commented
4 years ago OK, I get it. Could basic ray tracing be an alternative to reduce spoofing?
On Mon, Nov 11, 2019 at 1:43 PM boltgolt notifications@github.com wrote:
We could, but it would not be effective in determining if a subject is alive or not, and thus not help prevent picture spoofing. We would be adding false colors to both real humans and pictures and the difference would not be noticeable.
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papermache
commented
4 years ago Here is another small raytracing program. There are quite a few repos.
https://github.com/embedded2016/raytracing
On Mon, Nov 11, 2019 at 1:48 PM Benjamin Fenigsohn fenjamin@gmail.com wrote:
OK, I get it. Could basic ray tracing be an alternative to reduce spoofing?
On Mon, Nov 11, 2019 at 1:43 PM boltgolt notifications@github.com wrote:
We could, but it would not be effective in determining if a subject is alive or not, and thus not help prevent picture spoofing. We would be adding false colors to both real humans and pictures and the difference would not be noticeable.
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-- Benjamin Fenigsohn Director, Elmhurst, Inc. c: 818-964-5858
If Howdy authenticated by false color from a heat signature in addition to the face model it would be harder to spoof with a photo.
https://github.com/loganwilliams/thermografree