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 dpc
27 Apr 2019, 14:31
Forum: Scanners and Build Threads
Topic: a small story for my scanner
Replies: 58
Views: 28307

Re: a small story for my scanner

You're correct. We don't know how much brighter the light is at the lower edge than the upper corners, only that it is brighter. What I wanted to make apparent is that in that image the light is brighter near the bottom of the page and that distinctive circular pattern across the various levels indi...
by dpc
26 Apr 2019, 21:51
Forum: Scanners and Build Threads
Topic: a small story for my scanner
Replies: 58
Views: 28307

Re: a small story for my scanner

Thanks for posting your progress. I took one of the images that you posted and reduced the number of levels in Photoshop to reveal the uneven lighting you have across the pages. In the image of both of the book's pages, the light looks as if it were pointed at the lower half of the page: 2PpmMjC_2.j...
by dpc
23 Mar 2019, 21:41
Forum: Lighting
Topic: Using SORAA Snap System Beam Spreader - Uneven Lighting
Replies: 18
Views: 963

Re: Using SORAA Snap System Beam Spreader - Uneven Lighting

Something to try.... Put a piece of white paper over one side of the platen glass (place OVER the glass, not underneath). Put a black piece of paper (or better, a piece of black velvet fabric) over the other side of the platen glass. Photograph the white paper. Next, replace the black paper with ano...
by dpc
29 Jan 2019, 13:43
Forum: Scanners and Build Threads
Topic: Another book shooter Mk-V
Replies: 8
Views: 1166

Re: Another book shooter Mk-V

You can do image color-correction as a post-processing step. This thread discusses the technique somewhat.
by dpc
24 Jan 2019, 13:06
Forum: OCR/Optical Character Recognition
Topic: OCR for 78 RPM record labels
Replies: 9
Views: 825

Re: OCR for 78 RPM record labels

If I were going to do this I'd get a 12"x12" piece of 1/4" MDF, put a 1/4" dowel coming out the center of it and stick that to the wall with double-stick tape. I'd put a camera on a tripod about 6' back, pointed at that dowel, and have two clip-on lights to the right and left of the tripod to light ...
by dpc
05 Jan 2019, 19:54
Forum: HELP
Topic: scanning & processing 78 RPM record labels
Replies: 2
Views: 410

Re: scanning & processing 78 RPM record labels

cday is right. It's worth determining if you can type the info you need from the label rather than scan the entire lot. If you were going to save the images of the record label for some reason (i.e. to display onscreen of a jukebox app) then it would probably be worth it to do the image mask, color ...
by dpc
20 Nov 2018, 01:04
Forum: Scanners and Build Threads
Topic: a small story for my scanner
Replies: 58
Views: 28307

Re: a small story for my scanner

i also design this Interesting design. You could make it fold up like a step ladder and make it easier to store away. Those black triangular pieces (light shields?) could be made from black fabric instead to allow the framework to fold. You may want to consider making the glass/plastic platens sit ...
by dpc
15 Nov 2018, 16:17
Forum: Scanners and Build Threads
Topic: Libreflip - a new open source page-turning bookscanner
Replies: 11
Views: 20616

Re: Libreflip - a new open source page-turning bookscanner

Are the scanner's cameras capable of capturing images at this point? If so, after having mounted the light, do you see a reflection of the light source in the camera's view? Looking at the dimensions and angles of the platen and camera configuration shown in your first video, it looks like the camer...
by dpc
08 Nov 2018, 16:13
Forum: Lighting
Topic: Using a polarizing filter to suppress glare and lighting reflections?
Replies: 8
Views: 76645

Re: Using a polarizing filter to suppress glare and lighting reflections?

I'm so pissed right now! I typed up a response comprising multiple pages explaining the formulas and examples of how to use them to calculate light and camera distances based on page sizes and platen angles and when I clicked on 'Preview' to check the formatting this POS website took me to the login...
by dpc
05 Nov 2018, 16:32
Forum: Lighting
Topic: Using a polarizing filter to suppress glare and lighting reflections?
Replies: 8
Views: 76645

Re: Using a polarizing filter to suppress glare and lighting reflections?

Dan's original post regarding platen angles here: https://forum.diybookscanner.org/viewtopic.php?f=17&t=1149 For some odd reason the links to the associated videos don't appear to be in that post any longer. Here they are: Part I Part II Part III I can provide the mathematical routines for determini...