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

Minimum Camera for Book Scanning

Everything camera related. Includes triggers, batteries, power supplies, flatbeds and sheet-feeding scanners, too.
blueblazer

Re: Minimum Camera for Book Scanning

Post by blueblazer » 03 Feb 2012, 13:44

I have been experimenting with smart phone cameras with my scanner and have found the Droid Incredible to work quite well as an 8mp camera. I've found I can scan books up to 8x10 without much issue.

I'm using droid based cameras, do to the ability to fully script the picture taking and sorting process, bypassing any need for mechanical triggers or camera firmware shenanigans and seem to be having some success. Having all your pages fully sorted and ready for cleaning through Scan Tailor as soon as you finish the scan is really quite handy.

You can pick up an Incredible with a bad ESN for around 60$(we don't need it for the cell service after all). You can setup a manual focus using Camera 360 as I have found the auto focus feature really throws you off if you are scanning quickly. As the cost of used smart phones comes down and the camera resolutions come up I believe that this will eventually be the route we take. The HTC Titan II is already up to 16mp($700 :shock: but so was the Incredible when it first came out.)

I'm working up my build for you guys as soon as I get the last few kinks worked out.

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Heelgrasper
Posts: 70
Joined: 19 Feb 2012, 21:04
E-book readers owned: None
Number of books owned: 500
Location: Randers, Denmark

Re: Minimum Camera for Book Scanning

Post by Heelgrasper » 21 Feb 2012, 19:58

One subject that needs to be dealt with is the minimum focus distance (MFD from now) when you zoom.

I haven't thought of it as a problem until yesterday but it seems be a growing problem. My old Canon PowerShot A540 in macro mode have a MDF of 5 cm (2 inches) when not zoomed (W) and 30 cm (12 inches) when zoomed (T). In my experience the 30 cm kicks in as soon as you zoom, not just when you're at full zoom. Without macro mode the MFD is 45 cm (18 inches) for both W and T.

For the newest line of Canon PowerShot A-series cameras that has changed quite a bit. It might have done that long ago but I haven't noticed before.

The Canon PowerShot A810 can serve as an example since it seems to be same for all in the new line. The specifications are ( http://www.usa.canon.com/cusa/support/c ... ifications ):

Focusing Range
Normal: 2.0 in. (5cm) - infinity (W), 3.9 ft. (1.2m) - infinity (T)
Auto: 1.2 in. (3cm) - infinity (W), 3.9 ft. (1.2m) - infinity (T)
Macro: 1.2 in. - 2.0 ft. (3-60cm) (W)

It has to be confirmed but this could mean that if you're book scanning you can't zoom in unless the camera is at least 1.2 m from the platen. Basicly the same seems to be true of a camera like Sony DSC-W570.

So it seems MFD when zoomed is something to look out for. If you can't zoom you might need to able to change the distance between camera and platen more to adjust to different sized books (or live with wasted pixels and lower DPI). And if barrel distortion is a problem when the camera isn't zoomed the only way around might be to build a scanner were the cameras are something like 3-4 feet from the platen.
---
Jakob Øhlenschlæger
Randers, Denmark

The past is a foreign country: they do things differently there
L. P. Hartley

jlee
Posts: 5
Joined: 22 Nov 2011, 12:10
Number of books owned: 0

Re: Minimum Camera for Book Scanning

Post by jlee » 06 Apr 2012, 10:01

Hi Folks,

Building my set up and need help on camera selection. Will the Canon ELPH 100 HS work OK? Been trying to find out whether this particular model has SDM or CHDK, but no luck yet. Any one with a guidance on this, please help. Thank you in advance.

John

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Gerard
Posts: 154
Joined: 17 Oct 2010, 07:15
Number of books owned: 0
Location: Berlin (Germany)

Re: Minimum Camera for Book Scanning

Post by Gerard » 06 Apr 2012, 10:52

http://bit.ly/HPXdzL

the canon cameras have sometimes different names in different countries, see the porting thread how far the development is

barth
Posts: 28
Joined: 28 Sep 2014, 09:42
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Country: Belgium

Re: Minimum Camera for Book Scanning

Post by barth » 20 Jun 2015, 17:16

In my experience it depends on the goal of your digitization project, which will determine the image quality you want, which will determine which camera you want to use. And then of course, your choice will be limited further by the availability of chdk builds :)

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