[aprssig] Packet Compressed Sensing Imaging (PCSI)

[Ross Whenmouth]

Hi Jaye,

That is not how "compressed sensing" works.
If you only receive 75% of the packets, your computer can still 
reproduce a representation of the original image, but the picture 
quality won't be as good as what you would see if your computer had 
received 100% of the packets.
This is a good intro to compressed sensing:
http://www.pyrunner.com/weblog/2016/05/26/compressed-sensing-python/

One possible mode of operation might be as a "digital fountain" (search 
term: "fountain code") where the sending machine keeps sending packets 
until the recipient(s) machines tell the sending machine that they have 
successfully received enough packets and it can now stop sending.
It doesn't matter which recipients receive which packets, provided that 
each receiver receives enough packets, which means that there is no need 
to send the same packet twice (which wastes air-time for those who have 
already received the duplicated packet).


73 ZL2WRW
Ross Whenmouth


On 8/07/20 4:00 am, aprssig-request at lists.tapr.org wrote:
> Subject:
> Re: [aprssig] Packet Compressed Sensing Imaging (PCSI)
> From:
> MJ Inabnit <ke6sls at arrl.net>
> Date:
> 7/07/20, 4:50 pm
>
> To:
> aprssig at lists.tapr.org
>
>
> If we're dreaming, then lets add one more idea.  FLamp (from the FLdigi
> software) has the ability to copy part of a message, then request fills
> of only what it didn't get.  So perhaps this new mode can add that
> element so if a user QSY's and only gets 75% of image, it would only ask
> for fills of the 25% it didn't get.
>
> Dreaming:)
>
> 73
> Jaye ke6sls

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