Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ

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by rkomar
01 Dec 2016, 04:19
Forum: Scanners and Build Threads
Topic: Best non-DIY book scanners
Replies: 44
Views: 47730

Re: Best non-DIY book scanners

I would add that, for acid-paper, scanning with the Plustek in black and white can produce a lot of noise if the pages are becoming brown. It appears that the scanner software just does a simple thresholding calculation when binarizing the output file. I got much better results when I scanned in gre...
by rkomar
30 Mar 2016, 18:47
Forum: Cameras and Electronics
Topic: Problem with the other camera not focusing properly
Replies: 4
Views: 2780

Re: Problem with the other camera not focusing properly

For a fixed geometry, you might try taking a series of pictures at different focal lengths, see which looks the best, and then always set the focal length to that value and lock it prior to each session. Relying on autofocus is hit and miss, depending on what is being photographed.
by rkomar
09 Feb 2016, 15:40
Forum: Scanners and Build Threads
Topic: Announcing the Archivist Quill
Replies: 30
Views: 31780

Re: Announcing the Archivist Quill

Wouldn't the cradle meet the platen before the knot hits the pulley? It seems to me that as long as the distance from the pulley to the knot is greater than the distance from the cradle to the platen, the knot won't reach the pulley. Shortening or lengthening the ropes is an easy solution. I was thi...
by rkomar
09 Feb 2016, 03:23
Forum: Scanners and Build Threads
Topic: Announcing the Archivist Quill
Replies: 30
Views: 31780

Re: Announcing the Archivist Quill

Nice job on the videos! The system looks pretty nice. My only quibble is that it looks like the push bar is a little in the way when it comes time to flip pages, especially if you don't want to drop the book all the way down and lose your page in a springy book. Is that the case, and if so, any thou...
by rkomar
31 Dec 2015, 13:16
Forum: Scanners and Build Threads
Topic: One size doesn't fit all --or how to scan larger books
Replies: 6
Views: 14145

Re: One size doesn't fit all --or how to scan larger books

I wouldn't go less than 45 degrees, or you will see reflections from the opposite pages. Going more than 45 degrees cuts down on those reflections, but then you have to put the light source further away or you start to see its reflection in the images (especially for large books). If you don't want ...
by rkomar
05 Nov 2015, 03:12
Forum: R&D and New Technologies
Topic: A cheap 3D Volume to Page Scanner?
Replies: 5
Views: 6698

Re: A cheap 3D Volume to Page Scanner?

I don't mean that you have to send a bolt of lightning into the book, but rather that the bolts would be coming out when the charge built up enough inside the pages. Since paper doesn't conduct electricity, it would continue to charge up until it arced out. The same thing happened with the plexiglas...
by rkomar
03 Nov 2015, 11:24
Forum: R&D and New Technologies
Topic: A cheap 3D Volume to Page Scanner?
Replies: 5
Views: 6698

Re: A cheap 3D Volume to Page Scanner?

The pages of the book are nonconducting, so I suspect the "lightning bolts" shooting through it when the charge builds up would fry it. I saw a piece of plexiglas with some pretty discharge patterns when a proton beam was shot into it.
by rkomar
14 Sep 2015, 14:49
Forum: Lighting
Topic: Edge lighting
Replies: 3
Views: 4073

Re: Edge lighting

The problem is that the camera is much more sensitive to light levels than the human eye, and will pick up differences in light intensity over the page. That may not be too bad if you only convert to black and white images, but grayscale and colour images will look uneven. Similar technology is used...
by rkomar
18 Aug 2015, 16:57
Forum: Scanners and Build Threads
Topic: Anti-reflective glass
Replies: 7
Views: 4755

Re: Anti-reflective glass

One problem I noticed with my ordinary glass is the reflections of the cameras themselves, especially any shiny pieces on them. The only way to avoid that is to make the cameras, clamps and what's behind them completely black. I wasn't able to accomplish that, so anti-reflective glass would be very ...
by rkomar
29 Jul 2015, 14:14
Forum: R&D and New Technologies
Topic: Binarization
Replies: 14
Views: 16076

Re: Binarization

I like the results I'm getting with the binarizewolfjolion program, available from Christian Wolf's website: http://liris.cnrs.fr/christian.wolf/software/binarize/. The latest versions use opencv for image manipulation. I'm not sure if it builds under cygwin; I only run it on my linux machine.