rMQR codes
rMQR codes
rMQR codes
rMQR codes
rMQR codes
rMQR codes

rMQR codes

The above is the rMQR Code for "https://padumma.com"

Critical to this proposal is the relatively new QR variant, rMQR, which became an ISO standard in May of 2022. An apropos analogy would be: square is to rectangle as QR is to rMQR. It seems like these rMQR codes would be easier to handweave than the original large square QR codes.

In May of 2022, ISO standardized a new QR code variant. Standard ISO/IEC 23941 defines this new type of QR code, called rMQR codes. They are designed to be narrow (7 to 17 “modules” wide), and come in various lengths as needed to address data storage requirements.

Six blank rMQR codes of various sizes

An R7-sized rMQR is – as the name implies – 7 modules wide. Here is what an example R7x77 rMQR looks like. This is large enough to encode a UUID, which would be a very useful garment ID by which Padonma could track garments in a distributed inventory system. (Note the rMQR spec calls for two a two module wide margin quiet zone around an rMQR Code, so the white background margin below is technically part of the rMQR Code. More importantly, a R7-sized rMQR would require an 11 module wide band to be handwoven.)

An example rMQR, of size R7 x 77, long enough to contain a UUID

All Universally Unique Idenfifiers (UUIDs) are 128 bits long or, in other words, 16 bytes in size. According to ISO 23941, an rMQR Code of size R7x77 at error correction level “M” can handle 160 bits (or 19 bytes max). Or an R9x77 (error correction “H”) can also handle exactly 16 bytes of data.

For Padonma, the QR code will contain a UUID that IDs the garment. For example, one of those UUIDs might look like the following:

170bf486-a96f-47e9-90e6-632373d27924