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Create Your Own Digital Library - Open Knowledge — LiveJournal

Jul. 30th, 2003

01:53 am - Create Your Own Digital Library

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From:gustavolacerda
Date:July 30th, 2003 02:14 pm (UTC)
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I have tried to do this.

I actually paid like $40 for the copy stand, which is now useless. I photographed a few pages, but didn't get around to OCRing them. My ideal device for this could be named "book2pdf".

The other thing I wanted to do is digitize my thousands of scribbles, including math, drawings and lots of handwriting. This could be done, but the resulting medium (a simple picture format) would be far from desirable. Still, I searched for ways to automate snapping (pressing the camera button for each page is a little troublesome), lighting and automatic feeding (the stack-of-paper analog of flipping) of pages with ADFs (automatic document feeders). If automated and properly synchronized, I could leave them doing their thing. But it was to be yet another idea that stayed on paper... or rather, on mind.

By the way, once this sort of process gets good enough, scanners will become obsolete. The cameras' resolution is already more than enough.
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From:joe_tofu
Date:July 30th, 2003 05:40 pm (UTC)

hmm

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Well, a camera has a curved lens, so there is some distortion. For that reason anybody who is serious about getting an accurate reproduction (artists, "analog" photographers) will need a scanner.
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From:gustavolacerda
Date:July 30th, 2003 07:59 pm (UTC)

Re: hmm

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It's not because the camera has a curved lens. Any "eye" is going to project a rectangle onto a sphere.

But that's a fairly small problem given a decent distance, say 70cm, especially if the text is going to be OCRed.

But for the sake of the pictures and all, you can always use some good old digital geometrical transforms, or maybe a special kind of lens designed to correct that. For the former approach, laying a gridded transparent glass on top of the sheet may be helpful.
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