Earlier quoted context omitted.
I commend your enumeration of religious and mystic texts.
Yes I was also impressed. But in making the point, the poster surely went overboard - Mahabarata (I just read about it on Wikipedia) is the "longest poem ever written", ten times as long as the combined Iliad and Odyssey, and at 1.8 million words that is going to be hard to fit into 1.5 megabytes even by itself - unless it is massively redundant I don't see how you can do it. The entropy per word has to be about ~1 b…
PaperBack – How to store data on a single A4/Letter sheet
111–119 of 119 posts
Re: PaperBack – How to store data on a single A4/Letter sheet
#112this has some pretty powerful applications for example for politics or mass dissemination of paper based digital files for the public to quickly consume. Imagine, if students could start posting free textbook pdf files just by handing out a piece of paper which you could scan, or maybe with a phone one day, and instantly receive the file. Why not QR code? QR code needs connectivity while this solution would just requ…
On that note, i seem to recall that certain encryption algorithms were transported out of USA by way of book back in the day. Back then (and i think the law is still in place) anything beyond something like a 90-bit key was considered a military weapon, and thus needed relevant export licenses. But this only applied to working binaries, not the code printed on paper. So what some researchers did was to get the code p…
Re: PaperBack – How to store data on a single A4/Letter sheet
#113With HCCB (High Capacity Color Barcode) of which an implementation is Microsoft Tag you can get 1.5 MB with 600dpi color on a A4. If you add the best compression techniques (cmix v7) depending on the source material you could get 8 times as much english text, easily fitting the pearls or religion: Tenach, New Testament, Quran, Mahabarata, The Dhamapada, the Atthakavagga and the Parayanavagga, Rhinoceros and Lotus Sut…
I imagine someone in a post apocalyptic world carrying around a single sheet like this without anyway to replay it but taking solace in knowing it exists somewhere in there.
Re: PaperBack – How to store data on a single A4/Letter sheet
#114Earlier quoted context omitted.
Clay tablets? They survived from Sumer, Assyria and Babylon thousands of years ago.
True, some of them did. Any idea what fraction survived? I quite like the idea of being able to frame the backup an important piece of text and put it on my wall.
Re: PaperBack – How to store data on a single A4/Letter sheet
#115Earlier quoted context omitted.
I think you (unintentionally?) are proving the OP right. Because it's far easier to swallow and poop out a plastic bag with a microSD card in it than it is to put a piece of paper in your carry-on. Plus--wouldn't full-body scanners catch something like this?
It depends on the amount of information you want to transfer, and how likely it is that you'll get a full customs inspection. A single microSD card can hold 512 GB of data; try bringing that in paper format through customs.
Re: PaperBack – How to store data on a single A4/Letter sheet
#116Re: PaperBack – How to store data on a single A4/Letter sheet
#117Re: PaperBack – How to store data on a single A4/Letter sheet
#118Here's a demo PNG file which contains 48 QR codes (6x8) at V23 level with L correction (~7% recovery). That's 1091 bytes per code, or just over 51KB per page when printed at 300 dpi. This level of density seems to be very reliable using ambient lighting and an iPhone 5c.
I was also able to read a QR code which was 66% of that size, but it required turning on the iPhone's flash in order to be reliably read. That level of density would allow fitting 9x12 codes on a single page at 300 dpi, which would yield 115KB of data per page.
(At first I tried using 600 dpi, but at 1 dot per pixel the codes were totally unreadable by a cell phone. The above 115KB/page density is the equivalent of 4 dots per pixel at 600 dpi. The good news is this means the system doesn't require a 600 dpi printer. In fact, at 1 dot per pixel, the 51KB/page density is equivalent to 100dpi, and the 115KB/page density is equivalent to 150dpi).
Re: PaperBack – How to store data on a single A4/Letter sheet
#119This inspired me prototype out a system which would use QR codes and use a smartphone camera for recovery, rather than a flatbed scanner. Here's a demo PNG file which contains 48 QR codes (6x8) at V23 level with L correction (~7% recovery). That's 1091 bytes per code, or just over 51KB per page when printed at 300 dpi. This level of density seems to be very reliable using ambient lighting and an iPhone 5c. I was also…