Search found 308 matches

by duerig
04 Jan 2017, 11:29
Forum: Cameras and Electronics
Topic: Dire camera situation 2017
Replies: 11
Views: 363

Re: Dire camera situation 2017

This has been a growing problem. For smaller books, a Pi camera (at 8MP) is likely to be sufficient. So I have been working on adding support for them to Pi Scan. Similarly, for those who want a high quality camera, the DSLRs and mirrorless cameras that libgphoto supports are the way to go and so I'...
by duerig
20 Dec 2016, 11:08
Forum: Scanners and Build Threads
Topic: My DIY Scanner
Replies: 31
Views: 567

Re: My DIY Scanner

Pi Scan finds the focus once at the beginning of the session and then locks it there. So it is really designed for the case where the camera is fixed relative to the platen. This must be why it slowly drifted out of focus on the original design. Billgill, this scanner looks really good. Especially t...
by duerig
20 Dec 2016, 10:52
Forum: Scan Tailor
Topic: Scan Tailor and Keystone effect correction
Replies: 2
Views: 106

Re: Scan Tailor and Keystone effect correction

Try using the dewarp feature on Scan tailor. If you have a consistent keystone, you should be able to set up a manual dewarp on one page and apply it to all the others. But you can pretty reliably avoid keystoning in the first place by aligning your cameras. The trick is to get a small mirror and ta...
by duerig
14 Dec 2016, 14:03
Forum: Agora / The Marketplace
Topic: Automated Book Scanner - ?
Replies: 1
Views: 98

Re: Automated Book Scanner - ?

There are a number of people who have been developing designs for automated book scanners. Dany, the one who developed the linear book scanner you read about, is still actively working on it. I'm sure that he will post here and on his site when he has more to show. In the mean time, you can see the ...
by duerig
07 Dec 2016, 18:34
Forum: "Destructive" Scanning
Topic: ix500 workflow. Scan directly to grayscale/bw or do it in photoshop postprocessing?
Replies: 21
Views: 326

Re: ix500 workflow. Scan directly to grayscale/bw or do it in photoshop postprocessing?

I never saw much of a benefit to scanning in greyscale on the camera. And I also found that it seemed to slow down the scanning cycle somewhat. When just taking normal pictures, I find that the cameras work as fast as I can turn the pages. When using greyscale, I had to wait on the camera sometimes....
by duerig
07 Dec 2016, 18:32
Forum: HELP
Topic: Confused newbie - new versus old
Replies: 1
Views: 103

Re: Confused newbie - new versus old

This is definitely something I want to fix. I'll start looking through all of the webpages to see if I can find all the places where it might be ambiguous. If you noticed any pages in particular that need fixing, please post links here.

-Jonathon Duerig
by duerig
07 Dec 2016, 18:31
Forum: Scanners and Build Threads
Topic: a small story for my scanner
Replies: 6
Views: 365

Re: a small story for my scanner

This looks great! I would agree that you should feel free to ask any questions you come across. But judging from your results, it looks like you have the whole process figured out. Well done on a great build.

-Jonathon Duerig
by duerig
03 Nov 2016, 15:26
Forum: Software
Topic: i need a software
Replies: 3
Views: 255

Re: i need a software

I think L.Willms has the right idea and Scan Tailor is what you want. Take a look at the tutorial video for it:

https://vimeo.com/12524529

-Jonathon Duerig
by duerig
13 Oct 2016, 15:59
Forum: HELP
Topic: Newbie Questions about Reducing File Size...
Replies: 6
Views: 256

Re: Newbie Questions about Reducing File Size...

Thanks for those clarifications, cday. There are a lot of trade-offs to be made between quality and compression. And binarization can work both ways. On the one hand, it can 'sharpen' an image by making the text blacker and the background whiter. But it can also make things much harder to read if it...
by duerig
13 Oct 2016, 12:45
Forum: HELP
Topic: Newbie Questions about Reducing File Size...
Replies: 6
Views: 256

Re: Newbie Questions about Reducing File Size...

Usually the compression happens in the last step when creating a PDF or DJVU or EPUB file from the ScanTailor images. Don't worry too much that the ScanTailor images are large. Here are the three basic paths that you can follow: (1) Create an epub file by OCRing the text. You typically lose formatti...

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