ctrlw
Posts: 7
Joined: Wed Dec 19, 2018 6:16 pm

Video magnifier for low vision

Fri Dec 21, 2018 3:01 am

Update (2020-12-29): Documentation now at https://github.com/ctrlw/magni

Need a Christmas present for someone with reduced vision, or want to build a Raspberry Pi video magnifier over the holidays?

I’ve just done that with a Pi camera, and shared the description on my blog: http://www.fhack.org/2018/12/19/raspber ... fier-2018/

Such a low vision reader can help e.g. elderly people with macular degeneration to get rid of hovering a magnifying glass when reading.

It supports switching between different levels of magnification with a single push button, or full control including colour inversion for white on black reading.

My post describes 2 different setups, but the fun part is probably to make up your own.

I’d be happy if this helps anyone, so please give feedback, notify me of stuff I missed, as well as your results and ideas.

Happy holidays!
Markus
Last edited by ctrlw on Mon Dec 28, 2020 11:15 pm, edited 1 time in total.

ross43729
Posts: 1
Joined: Sat Jan 04, 2020 8:38 pm

Re: Video magnifier for low vision

Sat Jan 04, 2020 8:50 pm

Hi Markus,
I posted a reply on the fhacks.org page in July, but didn't have a photo to post or know how to add a photo to
VideoMagnifier_v1.png
VideoMagnifier_v1.png (100.33 KiB) Viewed 4416 times
a reply there. A photo of the lamp-mounted camera is included here. I didn't use the read-only script because I wanted to retain the option of editing the configuration later, but the card seems to have become corrupted. I will visit soon to replace the card with a version set to read-only (except when GPIO pin 21 is grounded), and try an adjustable focus camera from Arducam in place of the stock v1 Rpi camera module.

ctrlw
Posts: 7
Joined: Wed Dec 19, 2018 6:16 pm

Re: Video magnifier for low vision

Mon Dec 28, 2020 11:06 pm

ross43729 wrote:
Sat Jan 04, 2020 8:50 pm
Hi Markus,
I posted a reply on the fhacks.org page in July, but didn't have a photo to post or know how to add a photo toVideoMagnifier_v1.png a reply there. A photo of the lamp-mounted camera is included here. I didn't use the read-only script because I wanted to retain the option of editing the configuration later, but the card seems to have become corrupted. I will visit soon to replace the card with a version set to read-only (except when GPIO pin 21 is grounded), and try an adjustable focus camera from Arducam in place of the stock v1 Rpi camera module.
Thanks Ross, I've only come to see this now and am very happy to see your setup.
The main reason for the read-only script is to avoid corrupting the SD card, and you can make the file system writable afterwards again if you want to do changes. This would not undo all of the script's actions, but should be enough for tweaks on the system or setup.

Did you improve the setup in the meantime?

ctrlw
Posts: 7
Joined: Wed Dec 19, 2018 6:16 pm

Re: Video magnifier for low vision

Mon Dec 28, 2020 11:11 pm

It's been 2 years since the original post, and I've just updated the video magnifier setup and documentation on github: https://github.com/ctrlw/magni

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davidcoton
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Joined: Mon Sep 01, 2014 2:37 pm
Location: Cambridge, UK

Re: Video magnifier for low vision

Mon Dec 28, 2020 11:12 pm

I don't think you will get an answer:
ross43729

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