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
11 Apr 2014, 00:20
Forum: Scanners and Build Threads
Topic: Simple, easy to build, ~600pg/hr, very portable scanner
Replies: 29
Views: 27382

Re: Simple, easy to build, ~600pg/hr, very portable scanner

I would guess that no change is ever made to the zoom factor once it is set up to get the whole of the glass plate into the picture. For small books, you just crop away a lot of the picture around it. That's the price you pay for a simple, unchanging setup. I also had the same questions about the er...
by rkomar
30 Mar 2014, 19:41
Forum: Scanners and Build Threads
Topic: A new scanner design using plastic tubing
Replies: 224
Views: 145121

Re: A new scanner design using plastic tubing

How long do the camera batteries last? How old are the batteries? Are the RAW images being saved as well as the JPG images when using the Canon CHDK software? Is the camera display on? Is the autofocus on? Is the USB connection being used to download each image on the fly? ... It's an impossible qu...
by rkomar
30 Mar 2014, 14:52
Forum: Scanners and Build Threads
Topic: Camera mounts for the DIY Book Scanner...
Replies: 11
Views: 6155

Re: Camera mounts for the DIY Book Scanner...

Aw crap! To prove my point, I scanned a ruler in both directions, and carefully calculated the resolution in the images in both directions. They both came out to 600 dpi. Yet, when I display a scanned PDF book on the monitor and hold the real book beside it, I can see that the text looks compressed ...
by rkomar
30 Mar 2014, 13:35
Forum: Scanners and Build Threads
Topic: Camera mounts for the DIY Book Scanner...
Replies: 11
Views: 6155

Re: Camera mounts for the DIY Book Scanner...

My Plustek Opticbook 3600 does _not_ keep the same scale in the X and Y directions. I'm not sure if this is common among scanners, but it's something to look out for when trying to use scans to measure physical dimensions.
by rkomar
25 Mar 2014, 14:46
Forum: Scanners and Build Threads
Topic: Scanner for less than 20$
Replies: 4
Views: 4821

Re: Scanner for less than 20$

It looks great for the price, but personally, I wouldn't accept the results. You can see from the first picture that the pages don't sit flat like they do against a pane of glass. The text will be slightly distorted because of that. Also, if some light comes in obliquely, you'll see shadows on the p...
by rkomar
19 Mar 2014, 22:27
Forum: Scanners and Build Threads
Topic: MDF-Built Hackerspace-Scanner
Replies: 12
Views: 6869

Re: MDF-Built Hackerspace-Scanner

I'm kind of against long-term editing because it can produce confusing threads. One person writes something wrong, another comments on it, first person edits out the error later, then the following comment makes no sense at all because the context is gone. That said, it would be nice to be able to u...
by rkomar
12 Mar 2014, 23:58
Forum: Scanners and Build Threads
Topic: Oversized davidlandin Model
Replies: 82
Views: 43449

Re: Oversized davidlandin Model

Some big advantages of LEDs over halogen lights are much lower power usage and heat output, smaller size for reduced reflections, and whiter light so the software has to do less white balance work. I first tried a halogen light, switched to LED, and wouldn't go back.
by rkomar
11 Mar 2014, 20:56
Forum: Scanners and Build Threads
Topic: Rhino his first scanner
Replies: 8
Views: 8145

Re: Rhino his first scanner

You can also move the camera back from the platen and zoom in to decrease the camera's viewing angle which will allow the light to be moved closer without appearing in the frame. Another option is to use two lights on either end of the platen crease instead of a single light overhead (underneath). ...
by rkomar
05 Mar 2014, 23:29
Forum: Scanners and Build Threads
Topic: A DIY Book Scanner In Every Hackerspace /DIY Kit
Replies: 399
Views: 356909

Re: A DIY Book Scanner In Every Hackerspace /DIY Kit

I wonder if it makes sense to use four cheap cameras (two per page)? That would get the DPI back up. You'd have to post-process the images a lot more than with one camera per side to produce a single image per page. You would also need more complicated camera rigging hardware, especially if you want...
by rkomar
25 Feb 2014, 15:27
Forum: Scanners and Build Threads
Topic: Oversized davidlandin Model
Replies: 82
Views: 43449

Re: Oversized davidlandin Model

I notice that the arms may not be horizontal when the platen is down, so the pictures will be skewed. If the camera mounts were attached to places where the platen is bolted to the attachments, making them fixed relative to the platen rather than the arms, it would fix that problem.