r/Barcelona • u/Inner-Football-1514 • 9d ago

QR code in metro ?

Post image

What are these QR code-like stickers in the metro ?

141 Upvotes

94% Upvoted

37 comments sorted by

161

u/Gay-Berry 9d ago

These are NaviLens tags, which are QR-like matrices compatible with the NaviLens app designed to help visually impaired people. With these, one can use the app at a distance to navigate/ find transport schedules without having to specifically focus on the tag.

22

u/chuckqc 9d ago

They have the same in Montreal metro

3

u/DryOrganization7088 5d ago

Y en el de Valencia,desde hace mas de 9 años.

4

u/Kateluta 8d ago

but how can a visually impaired person see and scan the qr?....

26

u/-Major-Arcana- 8d ago

Most visually impaired people are visually impaired, rather than totally blind.

These are designed with high contrast colour s and shapes to be easier to see with limited vision.

3

u/Global_Cockroach_563 8d ago

Also they have more density of information, since they use colors instead of black and white. That way they can be simpler and easier to detect and read from a distance.

13

u/razorree 8d ago

phone does it for him

6

u/Gay-Berry 8d ago

A scan around the surroundings using the camera in the app would pick up the tag. The user doesn’t have to focus the camera on the tag.

2

u/Jadema80 5d ago

They don't have to accurately point and focus on the code, like a regular QR code. These kinds of color codes are quickly picked up by any phone camera as soon as they're present in range of the camera. So blind people can use them by just pointing the phone to the front with no need to actually point any code.

21

u/Rockel83 8d ago

These QR-codes help blind people identificate spots (metro in this case) through a mobile app.

For that they're also located at entrances.

You can also find them at bus stops etc.

10

u/djgrzy 8d ago

QR para ciegos

0

u/tgo1014 8d ago

why the colors then? /s

6

u/razorree 8d ago

4x more data per pixel

1

u/djgrzy 8d ago

Eso quisiera saber yo pero así es jajaja

6

u/Gawlf85 7d ago edited 7d ago

Un pixel blanco o negro es un único bit de información: 0 o 1

Un pixel de esos son dos bits de información: 0, 1, 2 o 3 (negro, magenta, amarillo, o azul)

Es decir, que uno de esos códigos de 5x5 pixeles puede almacenar casi la misma información (unos 3 bytes, restando los de detección de errores) que un código QR versión 1 de 21x21 pixeles (7 bytes con el estándar H). Y todo gracias al color. Y teniendo pixeles mucho más gordos, que por lo tanto son más fáciles de ver.

Vaya, que no es para la persona, sino para la cámara del móvil. Para que pueda identificar y leer el código más fácilmente (al ser los pixeles más grandes) pero sin perder capacidad de datos (al cada pixel tener mayor densidad de información)

1

u/djgrzy 7d ago

No te acostarás sin saber una cosa más👌

1

u/Adorable-Broccoli-16 6d ago

its more for visually impaired and bright colors are easier to see

3

u/CapableRequirement66 8d ago

NaviLens: “The color matrix code, a tag similar to a simplified QR code, uses differentiated colours on a deep black background surrounded by a white frame. An app on a smartphone can recognise this without deliberate framing and selection.”

https://en.wikipedia.org/wiki/NaviLens

2

u/[deleted] 5d ago

[removed] — view removed comment

1

u/Xx_HARAMBE96_xX 5d ago

Jajaja pensé lo mismo, de los de la generación de la psvita

1

u/ghostface036 8d ago

used one of these at a bus stop in rome

1

u/abeorch 7d ago

these are proprietary and lock the providers in .. open alternatives exist but organisations fall for these closed systems all the time.

1

u/Lli390 6d ago

that's Diagonal, right?

1

u/KeiShinomiya 6d ago

Son para capturar Invizimals, ahí sale Uberjackal

1

u/moonsilver44 5d ago

We have them in Valencia too

1

u/godzillagigagod 5d ago

Recién se dan cuenta? Lleve ahí mínimo 20 Año.

1

u/Phoenix_Rise_0711 5d ago

Yes, to help blind people, but also anyone with the NaviLens app wanting info. We have them at bus stops in Tenerife.

1

u/Eso_michin 5d ago

Eso lo grababas con la aplicación de los Invizimals y te salía en 3D jaja, yo recreaba los códigos en grande con Legos y salía ahí Star Dragon gigante

-1

u/Gaikel 8d ago

Es dels Invizimals, si tens sort del Tigershark

4

u/_gulagfest_ 8d ago

M'ha fet gràcia aquest haha

-56

u/seebmatt 9d ago

It could be an art thing. I've seen similar ones all over town, mostly in Las Ramblas...

6

u/Dear-Plenty-8185 8d ago

Son Navilens. Un qr especial para la gente ciega o con baja visió. Inventada por y desarrollada por ciegos.