Footwear Forensics - Sixty Symbols
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- เผยแพร่เมื่อ 25 ส.ค. 2024
- Dr James Sharp on some work he is doing on a shoe print scanner.
It is in collaboration with East Midlands Special Operations Unit - Forensic Services. Read more about Cinderella at: www.nature.com/...
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Very nice how you have to put on a dress to use Cinderella.
Ask Caitlyn Jenner.
Moral of the story, wear new shoes before a heist.
Also, don't forget to get them 2 sizes too big, that will point to a different guy...
Most importantly, throw everything away you have worn. Fibers are a thing, too.
I think it is more like, discard/destroy your footwear along with all other clothing you were wearing during the crime. In Truman Capote's, "In Cold Blood", the killers immediately left town and trekked thousands of miles all over the U.S. and Mexico... but fortunately, never thought to get rid of the boots they were wearing during their crime.
oh, you can wear shoes; just get rid of them, as anything else...
Using infrared light would get rid of the background light. Or using polarized light on the camera and the LEDs would reduce the amount of background light that you would have.
Fascinating device. I suppose if you scaled it up to a size that you can actually walk/run along, you could also use it to diagnose/analyze walking/running/standing medical issues and their potential corrections.
I'd totally watch a Brady forensic channel.
Interesting video, but it didn't seem to confirm the link between Nike Air Maxes and violent crime I was expecting.
"Ad-I-Das" Oh lawdy
The german "i" in "Adidas" is pronounced like an english "e"
From "OK this... is Cinderella [...]" on, the video is suddenly a lot louder.
You can get rid of the black curtain by making the scanning LEDs blink at a certain frequency (something which is not a factor of 50 or 60 Hz) a and then separating the useful signal (that would be blinking at the same frequency) from the constant backround light.
This is by the way the same technology used in large scale touch screens such as in museums. They only use infrared leds and cameras.
Nice one Brady, but when are you going to do pop-pop boats and Richard Feinman's reverse lawn sprinkler (related) ?
Science finally addresses the nature of the sole!
This glass thingy is how the Microsoft surface table worked. You basically had a glass pane with leds all around and a webcam on the bottom. Search 'diy surface' to learn more. It's pretty cool.
I would love to see a video on total internal reflection, since I don't really understand it at all. It seems like the entirety of the energy of the wave ought to be reflected within the glass (except for some inevitable losses as heat), although somehow a visible wave is transmitted anyway.
Asda's own make shoes wear away so fast you actually get mostly a genuine foot print ;)
Use infra red LEDs with an IR filter on the camera to not have to mess around removing ambient light (at least for the 'fingerprint' style capture)
This was oddly fascinating
He said this technique relies on the object of interest being a good scatterer of light, and demonstrated it with his hand and a pair of pale-soled Converses. I wonder how well it would work on shoes or boots with black rubber soles that don't reflect as much light?
Really cool!
That's fascinating! Btw, is that the same technology used on comercial fingerprint scanners?
lol. why did they use white leds?? If they used near IR leds, which are both cheaper and brighter than visible light ones, they wouldn't have to shield the camera from ambient light with a drape and the suspect would be unaware that what they were walking on was some kind of sensor and would be less likely to deceptively modify their gait.
near IR should behave closely enough afaik, but should be much easier to distinguish from ambient light
Hi Brady, love all your channels and I don't want to miss a video, but I almost missed this one because of the very different thumbnail design. Love! -renzo
Im getting movie update notifications on my phone at 12am
One more vid then bed. Maybe 30mins of googleing current forensics practices lol.
Damn you Brady stealing my sleep!!
Hey Brady, what happened to James (Clewett)? Haven't seen him in ages, loved seeing him in the videos! He was always such a genuine character and such a lovely person to listen to.
Sorry for not being Brady,but James is working in Germany so it's hard for him to be in any videos.But I've seen him interact with Brady on Twitter so he'll probably be back if he gets the chance.
Very clever!
cinderella looks like a great piece of kit
A bit of a PSA: I've read my share of articles that have warned that, unlike what you see in CSI and similar shows, you can't just use any kind of prints for evidence. Fingerprints are good, as is DNA. Footwear can be good if there's something unique about the print that distinguishes it from other people wearing the same shoe (such as a unique wear pattern). Definitely don't assume that any oddball "print" is uniquely identifying somebody.
Nice mate.
You failed to ask what happens if you have black or dark shoe soles. He (the man) you were speaking to, said if the object on top of the acrylic is good at scattering light (I.e. white objects or light colours) it will reflect light into the angle of the camera (in that case, perpendicular to the acrylic). the easy solution to this is to have the person coat the bottoms of their shoes in white paint/ink but that then defeats the whole feasibility of using this apparatus because you're essentially using the old school method with a new more complicated setup. So the question I propose to anyone reading is this: would another form of electromagnetic radiation (like infrared) work? A portion of the surface not in contact with the acrylic would also reflect/emit infrared but I feel like that could be easily solved with computer image processing.
but if you were to use infrared, you'd have the issue of white not showing up well so perhaps the solution is to use a combination of the two or something in between
If it’s to do with refractive index, does that mean wearing a shoe made of glass won’t show anything?
If so, then I guess Cinderella was onto something.
hmmm... LEDs have a fairly monochromatic light. Would it work if you add a filter between the surface and the camera? (and use a coloured LED instead of a white one)
Neat! I'll try to replicate something like that!
This is also how certain rain sensors work right?
I thought I had clicked on the wrong channel and nearly bailed before I saw the relevance at nearly 4 minutes. But the big open question is - can you derive a unique signature for a shoe (maybe some kind of index), or is this just a new fangled way of taking a shoe print?
So is the idea to map the specific shape and wear pattern on a specific pair of shoes - like taking a fingerprint, or is it to capture the walking/pressure/contact pattern of a person?
I.e if the would-be thief changes their footwear will the system still be useful?
Wait, there are people who actually still do crimes without throwing their shoes away? I thought this was as deep in the public conscious as wearing gloves to avoid fingerprints, or throwing away a murder weapon...
i would just buy new shoes beforehand wear them to the crime and throw them away after. so having brand new shoes does not incriminate me
Please don't tell me people use the same murder weapon multiple times in this day and age! o.o
this is not about the shoes themselves but about the way people wears it.
gertrude dulila Welcome to the internet. :)
I don't know. Why don't you tell us all about it, "SheezyBites"...If that is your real name...
If I wear ice-skating shoes to rob a bank, you can't catch me now, can you?
They'd catch you because you couldn't run very fast in ice skates...
Just ice the neighbourhood up beforehand.
what are those
Why do I suddenly feel like I'm going to be tracked when walking over a perspex floor...
So, this could also be used by NSA in lieu of surveillance cameras, right?
What's the refractive index of an opaque material?
Oh hey its Snell's law.
Brady we need to discuss your pronunciation of Adidas.
I'm just using the Australian pronunciation I grew up with - search Adidas' own TV ads from Australia in the 1980s! They used it themselves! :) th-cam.com/video/LEYpVhhKniI/w-d-xo.html
Ha ha, fair enough.
+Sixty Symbols I went through half that commercial not even realizing the singer was saying adidas.
*Of course* there is a national footwear database.
What Image Processing software are you using? at 9:00 I think i saw a python icon in the start menu. Are you using Jython and ImageJ?
[08:40] What is the purpose of observing one of his feet as being backward?
If it relies on the sole scattering light, does it still work with black soles?
Even then, but wavelengths outside the visible spectrum could be used in these kind of scanners.
It works with black-soled shoes the same way that we see anything that's black: there's always SOME reflection.
(But not as much as with light colors. Why is why blue eyes, white skin and blonde hair photographs so much better than brown eyes, black skin and black hair.)
I see 2 big flaws with this to be exploited by someone that's committed a premeditated crime (i.e: they expect to be doing the crime and thus prepare for it and mitigate against a successful prosecution if caught.)
1. Buy new shoes before the crime and safely dispose of them immediately afterwards (or at the next convenient moment).
2. If caught, alter your stance when standing on the scanner so that your feet are weighted differently to normal.
Please, talk about the Great Attractor !!!!!!!!!!!!
now the question is, is it called Cinderella because of the shoe scanning of the dress
Chuck Taylor all stars.
Cool scanner, but has their been much critical investigation of this idea that people can be reliably connected to footprints using patterns of wear on the soles of their shoes? I would be interested in knowing the rates of false positive and false negative identification. I'd be concerned that a database of shoe prints could be abused to falsely implicate suspects.
From the lower right hand screen image, I thought that James has a serious foot orientation problem.
Why can't you just use pressure sensors to record the footprint instead of creating a new device using total internal reflection?
0:53 "ADD-did-dass"
Pretty sure it's "uh-DEE-duhs"
not in German at least
Adidas comes from the company's original founder, Adolf Dassler. His nickname was "Adi," with the stress on the first syllable, plus a shortened version of his last name, "Das," gives us "Adidas." The emphasis naturally stays on the first syllable.
It's actually short for Adi Dassler, which is short for Adolf Dassler, the founder of ADIDAS. He was the first to screw studs into the soles of football shoes, helping the German team win the world cup in 1954. His brother Rudolf is the founder of Puma. The two company headquarters sit but a few hundred yards apart.
Nah in Aus and the U.K. we say add-I-dass
What is it that drives people to help a group of people that think they know it all ?
my exact thought at 4:20 was "What black magic is this?"
I have shoes bought in the 1970s, one pair has plain leather soles. So do you think that they are on any footwear database? And then there is Prince Charles, still wearing hand made shoes he got in 1968.
4:15 OK, so this looks like it's exactly how the fingerprint scanners at airports work, except that this is an easier problem because we're trying to distinguish between a decent fraction of a person's weight versus nothing, compared to distinguishing the ridges vs troughs of the surface of the skin. So, although there's clearly physics involved in explaining how the device works, the design of the device isn't really physics at all: it's just re-engineering an existing system.
I guess this is why a detective or investigator used to known as a "gumshoe." ^_^
Shane B. Gross. One of the many hazards of law enforcement I guess.
Can you also make videos where you talk to PhD candidates? You know, if they are doing something interesting obviously.
What are THOSE!!!
so is vantablack shoe soles a counter?
They's probably wear out pretty quickly.
I think it would have been good to say, in the video: "This is something that's been for a few decades now. We're just handling the 'COMPUTER[Phile]' concerning issues." (You know the data base).
I fail to see any "physics" here, this is very simplicit forensic science. I know it's been around at LEAST since the 70's... I don't recall the case I watched (yes those "Crime shows"), but I do recall that it's extremely (relatively) old.
His foot prints on screen are pointed in different direction, looks funny
Bet you would have a field day with me Brady...I only wear shoes in stores from April to November and then they are just a flat leather moccasin...the rest of the time I am barefoot cause sidewalks wear out the leather.
Does Nottingham U. have a course or class in forensics?
I'm a student at nottingham uni, as far as I know there isn't a course in forensics, closest course to it is criminology
it's a little quiet? the video.
I were the cheep flat footed shoes lol
wait... what if the suspects wear different shoes when you check them? Or if they wear bags on their shoes? also, if all converse shoes wear in the same way, then the wrong person could be convicted because their converse shoes wore down the same way the real felon's shoes were worn down
"And I would've gotten away with it too, if it wasn't for those meddling Physicists."
isn't this just what they use for finger print for a long time?
that's what I was thinking too, basically a giant finger print scanner.
coool coool cool
Apollo Justice Case 2, anyone?
ah di das eh?
So what if i wear shoes with a glass sole? :)
No difference there.
Also, it would be far easier to identify the one guy with glass soles.
***** well damn ... there goes my saturday bank robbery plan ...
But if u planted glass soled shoes in loads of people's houses then they would say they never owned shoes like that and u could do that same
Still a different refractive index than air.
So the moral of the story is, if you're going to rob a bank buy a new pair of shoes first!
or steal them
sup people
nothing much, you?
sups
what's Gucci
sup bruh
Am I the only one who thinks he looks like 40 year old Harry Potter?
Footwear Foreskins.
Comment.
Reply.
semi-valid point followed by needless personal attack
***** Exactly.
Shameless promotion of a shitty Let's Play channel.
That's kinda cute.
we want the black holes! not this! black holes baby! now!
Of course, some burglars could be barefoot!
Second
time came second
Third
Chuck Taylor all stars.