ad: Schulman-1

How to add alpha numeric characters to a SSTV image

Discussion in 'Amateur Radio News' started by KM4EOM, Sep 30, 2015.

ad: L-HROutlet
ad: l-rl
ad: Left-3
ad: Left-2
ad: abrind-2
ad: L-MFJ
ad: Radclub22-2
  1. KM4EOM

    KM4EOM Ham Member QRZ Page

    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?
     
  2. PE1PME

    PE1PME Ham Member QRZ Page

    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!!)
     
    WM9F and KM4EOM like this.
  3. KT6A

    KT6A Ham Member QRZ Page

    Why not do both?
     

    Attached Files:

    N4EGA and KM4EOM like this.
  4. KM4EOM

    KM4EOM Ham Member QRZ Page

    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" =)
     
  5. KE4HTS

    KE4HTS Premium Subscriber QRZ Page

    My son and I have QR codes on our QSL cards that point to our QRZ.com page.
     
    KM4EOM likes this.
  6. KM4EOM

    KM4EOM Ham Member QRZ Page

    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?
     
  7. KT6A

    KT6A Ham Member QRZ Page

    Google Goggles reads QR codes, or other scannable codes, inherently. It's included with nearly every Android phone.
     

Share This Page

ad: wmr-1