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
21 Jul 2011, 16:06
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 18279

Re: Fix Keystoning via hardware adjustments

@Eppi, That's probably the best way to ensure that things remain aligned. I suppose you'll have to be concerned with the camera casting a shadow depending on where your lights are positioned, but other than that it should work OK. My camera has an onscreen display where it will draw an 'X' across th...
by dpc
20 Jul 2011, 12:54
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 18279

Re: Fix Keystoning via hardware adjustments

Now we established that c was 12 The degrees of the three corners are AB = 90° BC = 30° AC = 60° What will be the correct formula for calculating line a line b Length of 'a' = cos(AC) * c Length of 'b' = sin(AC) * c So with 'c' = 12... a = 0.5 * 12 = 6 b = 0.86025 * 12 = 10.4 Whether your trig f...
by dpc
20 Jul 2011, 01:38
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 18279

Re: Fix Keystoning via hardware adjustments

To convert degrees to radians you multiply the number of degrees times the value PI/180: radians = degrees * (PI / 180) degrees = radians * (180 / PI) 30 = radians * (180/1.61803399) This is wrong, as you should be using the value of PI (3.1415927) instead of 1.61803399. 30 = radians * (180 / 3.1415...
by dpc
19 Jul 2011, 16:59
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 18279

Re: Fix Keystoning via hardware adjustments

Use the Excel function RADIANS to convert a value in degrees to radians.


sine of BC (30 deg) should be 0.5.

cosine of BC should be 0.8660254
by dpc
16 Jul 2011, 19:21
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 18279

Re: Fix Keystoning via hardware adjustments

If you have a right triangle and know the length of one side and one of the other angles, you can find the length of the other sides using sine and cosine functions. Given a right triangle with sides a, b, and c, with c being the hypotenuse, and BC being the angle formed by sides b and c: a = sin(BC...
by dpc
15 Jul 2011, 00:33
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 18279

Re: Fix Keystoning via hardware adjustments

If you know the length (L) of the green line segment between the red and yellow camera direction vectors in the diagram below, then the vertical distance between those two lines (i.e. the amount you'll need to translate the camera) is simply L / cos(cradle_angle / 2). (The cradle_angle of the standa...
by dpc
30 Jun 2011, 17:55
Forum: Scanners and Build Threads
Topic: Aluminium build from Australia
Replies: 2
Views: 3398

Re: Aluminium build from Australia

Looks nice and clean. Will have any problems with reflections off all those shiny parts?
by dpc
16 May 2011, 10:48
Forum: Cameras and Electronics
Topic: Do we actually need portable cameras ?
Replies: 43
Views: 30951

Re: Do we actually need portable cameras ?

You put an HD camera above the book and start recording a video. When you turn the page you press a button. That button isn't connected to the camera, it's just a beeper/zoomer what ever ringing device. The sound is recorded and then you post process the video and extract the frames where the sound...
by dpc
14 May 2011, 15:21
Forum: Cameras and Electronics
Topic: Do we actually need portable cameras ?
Replies: 43
Views: 30951

Re: Do we actually need portable cameras ?

I've often wondered about the feasibility of using a video camera., which could be set up overhead to film both open pages. This would allow hands free turning of pages. One could pause at each page. Of course this would involve more post-processing to capture the stills from each page, so, not sur...
by dpc
10 May 2011, 18:10
Forum: Scanners and Build Threads
Topic: Fix Keystoning via hardware adjustments
Replies: 37
Views: 18279

Re: Fix Keystoning via hardware adjustments

Does this mean that the camera position should be adjusted over the course of a scanning a thick book?