Search found 98 matches
- 01 Dec 2016, 22:02
- Forum: Scanners and Build Threads
- Topic: Best non-DIY book scanners
- Replies: 47
- Views: 89412
Re: Best non-DIY book scanners
Ouch! That's a lot of money for half a year of scanning. I hope you can get it fixed.
- 01 Dec 2016, 04:19
- Forum: Scanners and Build Threads
- Topic: Best non-DIY book scanners
- Replies: 47
- Views: 89412
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...
- 30 Mar 2016, 18:47
- Forum: Cameras and Electronics
- Topic: Problem with the other camera not focusing properly
- Replies: 4
- Views: 6140
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.
- 09 Feb 2016, 15:40
- Forum: Scanners and Build Threads
- Topic: Announcing the Archivist Quill
- Replies: 34
- Views: 88177
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...
- 09 Feb 2016, 03:23
- Forum: Scanners and Build Threads
- Topic: Announcing the Archivist Quill
- Replies: 34
- Views: 88177
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...
- 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: 22099
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 ...
- 05 Nov 2015, 03:12
- Forum: R&D and New Technologies
- Topic: A cheap 3D Volume to Page Scanner?
- Replies: 5
- Views: 13321
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...
- 03 Nov 2015, 11:24
- Forum: R&D and New Technologies
- Topic: A cheap 3D Volume to Page Scanner?
- Replies: 5
- Views: 13321
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.
- 14 Sep 2015, 14:49
- Forum: Lighting
- Topic: Edge lighting
- Replies: 3
- Views: 9456
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...
- 18 Aug 2015, 16:57
- Forum: Scanners and Build Threads
- Topic: Anti-reflective glass
- Replies: 7
- Views: 11161
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 ...