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Video magnifier for low vision

Posted: Fri Dec 21, 2018 3:01 am
by ctrlw
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: ... 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!

Re: Video magnifier for low vision

Posted: Sat Jan 04, 2020 8:50 pm
by ross43729
Hi Markus,
I posted a reply on the page in July, but didn't have a photo to post or know how to add a photo to
VideoMagnifier_v1.png (100.33 KiB) Viewed 917 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.