Guys the shiny mustache is chapstick reflecting the lights lol gimme a break Edit: Apparently some of yall want a 5 paragraph essay explanation: Probably just accidentally rubbed my mouth and got some up there then the bright lights make it look way more exaggerated.

My favourite description of how error correction works is comparing it to a sudoku. Sudokus (with relatively few rules) can have most of the numbers missing, yet you can reconstruct the entire thing

Australia's largest supermarket chain is currently in the process of replacing all normal barcodes with data matrix codes on the packaging. This lets them store a whole bunch of things like the expiry date, batch number, etc. So if you try to scan something that's expired at the checkout it won't let you buy it

I can tell he had a lot of fun putting easter eggs in these qr codes

1:56 : STOP SCANNING THE EXAMPLES >:O That made me laugh so much! 🤣 LETS KEEP ON GOIN! 2:00 : oi mate i swear on me grave if you dun stop scannin these examples i'll give you a proper slap

When Joe uploads exactly what we need.

Someone had to do it: 0:03 Bunch of wiki links 0:14 "HEY THIS IS AN EXAMPLE, WHY YOU SCAN >:(" 0:30 Bunch of Lorem ipsum text 1:03 Just the numbers and a wikilink on the right 1:36 "EPIC bruh moment" and the same as 0:14 1:46 Bruh why you scan this 1:57 STOP SCANNING THE EXAMPLES >:O 2:00 "oi mate i swear on me grave if you dun stop scannin these examples i'll give you a proper slap" 2:22 I can't scan any of these 1:36 "EPIC bruh moment" 2:45 "Ver1" 2:58 "Ver1", "Version 2", "Version 3 QR Code" "VERSION 10 QR CODE, UP TO 174 CHAR AT H LEVEL, WITH 57X57 MODULES AND PLENTY OF ERROR CORRECTION TO GO AROUND. NOTE THAT THERE ARE ADDITIONAL TRACKING BOXES" "Version 25 QR Code, up to 1853 characters at L level. A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional code) that is designed to be read by smartphones. The code consists of black modules arranged in a square pattern on a white background. The information encoded may be text, a URL, or other data. Created by Toyota subsidiary Denso Wave in 1994, the QR code is one of the most popular types of two-dimensional barcodes. The QR code was designed to allow its contents to be decoded at high speed. The technology has seen frequent use in Japan and South Korea; the United Kingdom is the seventh-largest national consumer of QR codes. Although initially used for tracking parts in vehicle manufacturing, QR codes now are used in a much broader context, including both commercial tracking applications and convenience-oriented applications aimed at mobile phone users (termed mobile tagging). QR codes may be used to display text to the user, to add a vCard contact to the user's device, to open a Uniform Resource Identifier (URI), or to compose an e-mail or text message. Users can generate and print their own QR codes for others to scan and use by visiting one of several paid and free QR code generating sites or apps." "Version 40 QR Code can contain up to 1852 chars. A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional code) that is designed to be read by smartphones. The code consists of black modules arranged in a square pattern on a white background. The information encoded may be text, a URL, or other data. Created by Toyota subsidiary Denso Wave in 1994, the QR code is one of the most popular types of two-dimensional barcodes. The QR code was designed to allow its contents to be decoded at high speed. The technology has seen frequent use in Japan and South Korea; the United Kingdom is the seventh-largest national consumer of QR codes. Although initially used for tracking parts in vehicle manufacturing, QR codes now are used in a much broader context, including both commercial tracking applications and convenience-oriented applications aimed at mobile phone users (termed mobile tagging). QR codes may be used to display text to the user, to add a vCard contact to the user's device, to open a Uniform Resource Identifier (URI), or to compose an e-mail or text message. Users can generate and print their own QR codes for others to scan and use by visiting one of several paid and free QR code generating sites or apps." 3:18 "What in Davy Jones’ locker did ye just bark at me, ye scurvy bilgerat? I’ll have ye know I be the meanest cutthroat on the seven seas, and I’ve led numerous raids on fishing villages, and raped over 300 wenches. I be trained in hit-and-run pillaging and be the deadliest with a pistol of all the captains on the high seas. Ye be nothing to me but another source o’ swag. I’ll have yer guts for garters and keel haul ye like never been done before, hear me true. You think ye can hide behind your newfangled computing device? Think twice on that, scallywag. As we parley I be contacting my secret network o’ pirates across the sea and yer port is being tracked right now so ye better prepare for the typhoon, weevil. The kind o’ monsoon that’ll wipe ye off the map. You’re sharkbait, fool. I can sail anywhere, in any waters, and can kill ye in o’er seven hundred ways, and that be just with me hook and fist. Not only do I be top o’ the line with a cutlass, but I have an entire pirate fleet at my beck and call and I’ll damned sure use it all to wipe yer arse off o’ the world, ye dog. If only ye had had the foresight to know what devilish wrath your jibe was about to incur, ye might have belayed the comment. But ye couldn’t, ye didn’t, and now ye’ll pay the ultimate toll, you buffoon. I’ll shit fury all over ye and ye’ll drown in the depths o’ it. You’re fish food now." 3:41 Can't scan that one, it won't recognize 3:54 "ah yes hello good day this is a very good thing of text that will be still readable despite covering up lots of the actual code" 4:17 "wow incredible example i blocked off the middle and yet it is still readable" 4:40 "Ver1" 9:32 Same as the Version 10 QR at 2:58 10:39 Same as 0:14 11:10 "YES HELLO GOOD DAY" and "YES HELLO GOOD DAY TO YOU I SAY" 11:16 Some info about the HP laptop (as seen at 12:05) 11:21 MSI Plessey 0000000000000000000 13:18 Same as 1:46 15:07 Same as 1:57

Actually there is one 2d code missing, a code most of us had heard from (but maybe not about): Dolby Digital Code. This was one of the digital sound recording methods on analog films, between the perforation, was scanned by a little camera, decoded and given to the amplifier. About 15 years ago this code went pacticly away with digital projection coming up - but till then it was one of the most used 2d codes (4 codes per picture, 24 pictures a second), so anyone watching a DD movie in cinema heard 345600 2d-codes per hour (of course there was much redundancy in encoding, as parts of the perforation might get damaged).

3:30 Damn... Rick rolled.

I'm scanning all of those qr codes and some of them are actually pretty funny.

Bro I still remember the “how to increase your WiFi “ video like it was yesterday

I found out something sort of recently that was interesting. 1d traditional barcodes are actually read with the white spaces between the black lines. In hindsight that makes a lot of sense because it's the reflective part.

8:52 actually for RS-Code you always need 1 EC block to verify that the data is valid and then 1 additional block for each corrupted block in the data segment. so to replace 1 corrupted/missing data block you need 2 EC blocks. To replace 3 corrupted/missing data blocks you need 4 EC blocks and so on.

The biggest qr code is the entire "never gonna give you up" lyrics

Excellent show, Joe! As someone who was involved in building and programming barcode readers years ago, I understood most of what you were illustrating. It is fascinating how the relatively simple, one-dimensional designs have developed and expanded, using most of the same original principles and concepts.

The "Mask" that flips the blocks in the QR code is a process that is also used in digital signal transmission, called "Alternate Mark Inversion" so instead of having a digital signal that has a long string of 1's or 0's, these are broken up. This also helps with basic error detection in digital signals. If part of the transmission system receives no signal input, it creates an alarm signal to signify loss of signal at that point, and then injects a string of all 1's to transmit forward. This is an "Alarm Inhibit Signal", so the system recognises the point where the signal is broken, but prevents parts of the system further up the chain from creating their own alarm signal. This means the first place where the signal failed can be identified. Further up the system the all 1's signal registers as a "valid" signal, but displays a warning there is an all 1's input being received, so you can tell that there is a problem somewhere back from that point.

Some years ago we had unexpected crashes with our imaging software because one of the forms had square boxes one could tick exactly in the pattern of the finder squares the software thought to be able to read a QR code in between but actually it was human readable text. Was hilariously funny once we figured that one out.

"So did you deliver the sales reports to the higher ups?" "O, I thought you said 'drop a ton of LSD in the insane asylum.' Anyway, look at what they made. I call it Data Matrix"

Did anyone else scan all of these

I am so glad ThioJoe makes useful content like this now!

This video is phenomenal. It really embodies the essence of this channel. Spectacular job, Thio.

You miss the opportunity to rick roll us using the QR Code nevermind I see what you did there 3:30

This is a fascinating subject matter. Aztec codes, I have read somewhere, are better for use in mobile device displays than QR Codes. I would guess that their appearance makes them somewhat faster and more resilient for that purpose. Also, since they spread from the central pattern, I would also guess that they make it possible to emphasize certain parts of the encoded information (that closer to the core) and make partial readings possible.

at first i thought to myself "how cool would it be to make my own fancy QR code?" then after a while i realized it'd probably be a little stressful

9 years ago(I am 14 now), I used to think that a computer, like a billing machine would search for words hidden in those patterns. And I used go spend a hell Lotta time actually finding any letters or words hidden in the pattern of the qr and bar code 😅😅

Playing around with Scandit. It just recognized a small area of wood grain on my desk as Interleaved-2-of-5!

ThioJoe, your great explanation brought back memories of when I was a programmer, I had to write software to print UPC-A bar codes for a clothing manufacture. For bills of lading, price tags etc. I told management that the printer they purchased at great cost, was not able to print price tags small enough, so they had to buy another printer. It was a fun project.

Me scanning all the QR codes in the video…. Anyone else?

Am I the only one that scanned all of them?

The QR codes, when scanned, tell us a whole story

You did a fantastic job discussing this technology. This could be a multi-hour class, but you condensed it down really well. It is amazing where you find QR and Data codes, today.

This video was so great. I've always wondered about these and now I know!

Someone actually fit a whole snake game in the v40 qr code lol

Fun fact. The QR code in the video leads to Wikipedia. Missed chance for a Rick role

Dude this SCANDIT app is amazing, I am a huge QR code nerd (since having to make QR Codes for huge data for an invoicing application at work), and knew some of the details in this video before, but the discovery of this app is the best thing from the entire video for me. Thanks ThioJoe!

One of my favorite tech channels on KZfaq:) explaining common and uncommon stuff well to anyone with any skill 💪🏻

Here in the UK I remember a few times I have come across Aztec codes in trains like Virgin Trains (which became Avanti West Coast in 2019) and I believe cross country trains

13:30 All it really needs to store is the tracking number, then it can use that as a reference to look up all the rest of the shipping information from their database.

Thank ThioJoe for explaining QR codes. I always wander how it works you made it very clear, thanks again. You make this world for many people easier to understand. A big applause and merci French for thank you. Although I'm from Holland but in some parts of Holland we use the French word for thank you quite often. 🙏⭐😊

Awesome video, I never gave these much thought other than presuming they were magical. After your explanation I at least know they were produced by some very smart people. Thanks for the tutorial, you make it easier to understand.

This is a high level quality video, good job for it! Especially the animations and how you illustrated everything so we can better understand.

Funnily enough, some airlines also use Aztec codes for their mobile/digital boarding cards, as well as the PDF417 on the paper/printed ones. In my experience they're easier to scan off screens (and faster to process), probably because they're smaller and less complex. However they have less data in them, so occasionally you have to get a PDF417 reprint when certain things happen

Superb information. Never knew it was that complicated. Fascinating.

Your videos are always very worthful. Thank you bro

it's strangely adorable how he's constantly reassuring us thay the computer knows what it's doing lol

11:25 This big C H O N K of a Data Matrix literally says: "Wow, this code sure is unnecessarily large!" lol

I met CIRC error correction method at first in early seventies for Compact Discs. For every 16 bits of data there were 18 bits of error correction. I tested it putting a radial black tape on a disc and it was read correctly. Amazing.

Cool vid. Was wondering why some codes are different and how the patterns are read by a computer. This answers everything. Really cool

Wow, you are still my go to guy for cutting edge information made more simpler.

1:57 I scanned the code and it said: STOP SCANNING THE EXAMPLES

bro this had almost the whole info I needed for my project, thanks g

Wow Theo you really did BLOW my mind with this “code lesson” 😱. But now I DO have a better understanding of how these codes work.

I really like the fact that the thumbnail QR says "This is QR code" when you scan it

QR codes are so underrated. It blows my mind. Often the easiest way to copy some text or an URL is just make a qr code of it with your pc and scan with phone.

🤯 great video have always wondered about the other codes

This video deserves more likes and views, I could imagine the amount of research done to make such a video

I discovered (maybe not) that if you scan the QR code and the data matrix code in the thumbnail it will say what it is, and the ones in video will lead to either Wikipedia or a text file full of gibberish or describing the Version of a QR code or various different text files. Try it yourself! Neat detail Joe! Also, I did go through and scan them all and, yes my phone scans Data Matrix codes. Also I just got Rick Rolled by one.

Reed-Solomon? Nice, I used to know how that worked when I used to fix CD players and tried to learn how they worked. Now I don't remember anything about it lol.

I have an old Symbol USB Barcode scanner and remember it being able to scan those PDF417 and remember sometimes I had to sweep up and down a few times to get it all - and it would make digital noise while it was scanning. Now I understand what it was doing.

Selection of topics for videos are lit

Fun fact: this is his 666th video

The developers when Joe says "Yeah it's complicated but the computer has no problem understanding it": 🥺

Love that you put easter eggs in there!

i m scanning all the qr codes in this video

the ad code in the thumbnail says "this is a QR code"

Thank you very interesting. And just the right level of depth.

Thanks, this was really cool (I’ve always wondered how these codes work)!

3:51 “ah yes hello good day this is a very good thing of text that will still be readable despite covering up lots of the actual code”

Proud to be in first 150 viewers 😎

I gotta say, I'm honestly impressed with how ThioJoe has changed so much. Used to be a dirty troll but now he's here putting out good information. This is the kind of story that needs to be a movie.

Holy crap! I have always wondered how these all worked, I knew they were information of some sort but how they worked with a camera just amazed me. Now I _kinda_ get it, a bit. ....Just a bit!! You explained all this so bloody well!! Thank-you... Love how people scanned the examples and you left Easter eggs everywhere for them to find! I am sure this has been answered in the past and no doubt you get asked this frequently so are sick of explaining it, but what is that tick you have with your left shoulder/neck?

Dude I just read the Wikipedia page on QR codes don't question my knowledge

0:40 i searched for rick roll QR code and i found the same qr code

Thanks - never new any of this info - really informative.

Barcodes have always fascinated me. When QR, 2d and 3d barcode started showing up, it just amazed me, even though I understood what was going on. What amazes me more than anything is that we have printers with enough DPI control (I mean you can print all these barcodes on a bubblejet).

This guy is trying to be regular, I am really into this information.

When I started watching the video: hey I could make a program in Python to make these, it would be fun 5 minutes in: I guess I'll just make one to decode them, it's already good enough 10 minutes: why

I'm glad you mentioned Reed Solomon error correction in the video. Video was very very helpful.

Very informative video, subscribed! 😊

Can the coloured 2D barcodes be considered "3D" since the colours represent the barcodes's "depth"?

i was send to this video by a QR code 😂

Really interesting stuff here. Thanks

Cool video idea, loved it

2:02 : oi mate i swear on me grave if you dun stop scannin these examples i'll give you a proper slap

who else noticed a package from Bruce to Kent in 2:11

Man that research certainly took so long. Thanks for explaining in an easy way!

Congrats, great video!

For anyone wondering - the first one on thumbnail says: “This is QR code”

The setup seems to have changed, especially the colour scheme. Not gonna lie, it looks cooler.

The video is really informative. Thanks a lot!!!!

Very cool video! Thank you!

9:40 I wonder with this knowledge if it's possible to generate a QR code that has a fake finder pattern.

0:33 Qr codes (Top to bottem): Lorem Ipsum Regular Text 2h1g3212hdh1d dfgdghg1h3g2h1 s3h21sf2 s3fd1h gq895hq9gh Lorem Ipsum Regular Text 2h1g3 Lor 1 8 3

Thanks, that was very informative!

I learned some things from this video, thank you! I was disappointed in the discussion of error correction, though. Because the rest of the video is so high quality, the error correction hand waving really stands out.

13:52 oi mate i swear on me grave if you dun stop scannin these examples i'll give you a proper slap

i tried scanning them and they actually show something

Thank you for empowering me with the codes

Very helpful, Thanks!

I rick rolled my mom with a QR code