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 Mark Main
01 Nov 2013, 16:27
Forum: Cameras and Electronics
Topic: Fujitsu ScanSnap SV600
Replies: 15
Views: 18593

Re: Fujitsu ScanSnap SV600

The detailed specification shows the optical resolution varying during the scan: Optical resolution Horizontal scanning: 285 to 218 dpi / Vertical scanning: 283 to 152 dpi * * Optical resolution differs due to variable scanning That is presumably due to the CCD sensor having an angular motion as it...
by Mark Main
29 May 2011, 09:15
Forum: Software
Topic: Using a Reverse Warp Calculation to Dewarp
Replies: 1
Views: 2579

Using a Reverse Warp Calculation to Dewarp

I think that I have an eloquent solution to accurately dewarp. I’m getting ready for a new job, and so I want to offer this to the community so that it doesn’t get lost. If this is already a known idea, I am sorry, for my lack of time to investigate. I woke up with the idea in my head, and I spe...
by Mark Main
15 Mar 2011, 00:27
Forum: R&D and New Technologies
Topic: Methods To Sense The 3D Surface/Structure Of A Book
Replies: 358
Views: 245799

Re: Methods To Sense The 3D Surface/Structure Of A Book

Why do we need a grid? Right now I am thinking two lines are enough. Re: IR cameras, yep, I'm familiar . :) But I don't want to be using IR because we'll likely be infringing on Google's patent, and that's not going to help us stay in business. I'm not yet worried about the line quality at all. We ...
by Mark Main
25 Oct 2010, 22:16
Forum: Scanners and Build Threads
Topic: Gorilla Glass & Aluminosilicate glass
Replies: 41
Views: 77672

Re: Gorilla Glass & Aluminosilicate glass

here is the contact info for Corning:

http://www.corning.com/displaytechnolog ... tions.aspx

I contacted their corporate office trying to see about a group buy. I'll let folks here know if I got any better luck... probably not, but worth a shot.
by Mark Main
25 Oct 2010, 22:01
Forum: Scanners and Build Threads
Topic: Minimum Cradle Angle Formula
Replies: 12
Views: 12572

Re: Minimum Cradle Angle Formula

First I want to mention that I edited my original posting that said, "H=maximum Height of the page you will be shooting"; I changed it to say "H=shortest Height of the page you will be shooting" I made the change because I noticed that the minimum cradle angle increases as the books get smaller. Sad...
by Mark Main
24 Oct 2010, 00:14
Forum: Scanners and Build Threads
Topic: Automatic Page Turning
Replies: 10
Views: 10154

Re: Automatic Page Turning

I posted in another thread that it looks like cradle angles of 70 to 80 degrees are very possible to do and still get an unobstructed right angle photo of both pages. I assumed a 15" page size because our standard glass size seems to be 11"x15". The closer the camera is to the work, the less angle r...
by Mark Main
23 Oct 2010, 23:11
Forum: Scanners and Build Threads
Topic: Minimum Cradle Angle Formula
Replies: 12
Views: 12572

Re: Minimum Cradle Angle Formula

Whoa, what?? Can you draw this out for us? I love how you're thinking, but don't quite get it... Sure, I drew a diagram to save on the thousand words: http://www.markmain.com/images/MinimumCradleAngle.gif I estimated using a 14 degree camera angle to reach from the camera to the page. You can see t...
by Mark Main
23 Oct 2010, 22:34
Forum: Scanners and Build Threads
Topic: Minimum Cradle Angle Formula
Replies: 12
Views: 12572

Minimum Cradle Angle Formula

I'd always assumed that the minimum cradle angle needed to be 90 degrees to get a clear shot of each page to the camera; but then it occurred to me that a camera angle is far less than 90 degrees and so that would mean that the cradle angle can technically be less if you want and still get a right a...
by Mark Main
21 Oct 2010, 23:45
Forum: Scanners and Build Threads
Topic: Gorilla Glass & Aluminosilicate glass
Replies: 41
Views: 77672

Re: Gorilla Glass & Aluminosilicate glass

No, the G.G. division of Corning haven't returned my calls, emails. I've thrown some serious time at Corning to get an order placed; only samples have have been shipped. Maybe I find their competitor, but it's not looking good. At present, they have the G.G. market cornered and are scrambling to su...
by Mark Main
21 Oct 2010, 23:37
Forum: Scanners and Build Threads
Topic: Glass Size
Replies: 1
Views: 2410

Glass Size

First, let me say that I think that the 11x15 choice is a very good size selection because it covers every common book size and even many of the uncommon sizes up through the Quarto and British Imperial sizes. I know that I'm splitting hairs, but I'm surprised that 11.5x15.5 or 12x16 was not selecte...