How Many Characters / Digits Can A QR Code Store? http://qrcode.meetheed.com/question3.php Add a club newsletter, Contest info, Hamfest promos etc etc to a SSTV image. It's not encrypted or obscuring the message. QR codes are now mainstream. Why not use them to maximize data transfers within a SSTV image as a data container? Opinions?
If you are able to transmit/receive a noise-free picture....why not! Sounds interesting! (Now I have a nice idea for a JOTA-JOTI game!!)
Our hamradiocoin team is working on adding a few features to our new upcoming droid wallet revision adding SSTV QR images and a few other features. We are testing how many QR's can fit in one SSTV image, Obviously a clear transmission with excellent SNR will be required for clarity of the image, but if many QR's can be sent via a block or panel in a single image we can then create a OCR type feature that can create the QR panel and decode it for the receiver automatically. OCR https://en.wikipedia.org/wiki/Optical_character_recognition. We hope to incorporate this feature into our Hamdroid app so this can be done with a android device. This can be done manually but if many QR's are sent in one image some automation would make it easy to do on they fly. Anyone interested in participating in our project can inbox me here on QRZ, we are a relativity small team and can use all the help we can get. As that old saying goes "many hands make light work" =)
Use of QR codes is extremely easy QR plugin for Chrome https://chrome.google.com/webstore/...ension/oijdcdmnjjgnnhgljmhkjlablaejfeeb?hl=en QR plugin for Firefox https://addons.mozilla.org/en-US/firefox/addon/qr-code-image-generator/ QR scanner for Android https://play.google.com/store/apps/details?id=la.droid.qr&hl=en QR scanner for Iphone https://itunes.apple.com/us/app/quick-scan-qr-code-reader/id483336864?mt=8 Some of hamradiocoin's radio clubs use QR's to accept club donations. Left side of page 1/3rd down the page http://k2jji.org/ Glad to see some taking advantage of an awesome technology, the QSL card QR is a great example. We have been doing some research into maximum numbers QR's per SSTV image. You can test it in theory by using an example someone showed me. "In a QR code 35 modules gives ~72 characters. That is 35 rows and columns. Scottie 2 is 240 lines (256 with the first 16 greyscale). This gives over 6 lines per module. Assuming even half way decent SNR that should be adequate. 60 modules would give ~249 characters. 4 lines per module should be good with fair SNR. If you want to try it yourself without transmission generate a QR and then reduce it to 240 pixels high. Now try to read it. That would approximately simulate a SSTV transmission with excellent SNR." We also expect to test these theory's OTA via real SSTV transmission and try to find the SWEET spot for maximum characters per SSTV page. Considering propagation and time windows of opportunity the SWEET spot should be able to send the highest quality image in the shortest amount of time. @ 4,296 characters, the alphanumeric max multiplied by the total count of QR's on a single image could be significant amount of data per SSTV image. In addition I don't see why other common public encoding like Binary or Hexadecimal could not be the QR's payload. As long as you added a prefix to the QR image as KT6A did above with his callsign. Using a BIN or HEX designation in addition to a callsign. I think this would be within FCC and International rules, as no message would be encrypted with a private key. Only common encoding with a note telling readers what type of encoding is being used. http://encoders-decoders.online-domain-tools.com/ Sounds like a gray area, but in reality, it could be un-encrypted and un-obscured if done in a standardized encoding format. Opinions?
Google Goggles reads QR codes, or other scannable codes, inherently. It's included with nearly every Android phone.