User:Branko

From DPWiki
Jump to navigation Jump to search

Hi there, and welcome to my page.

Project management

Howtos

How I ...

Press services

Planetary scanner

A planetary scanner (also called orbital scanner) is a document scanner that hangs over a book (codex). The advantage is that a book can be kept open in a way that does not damage its spine. A lot of planetary scanners have as an added feature that they do not use a moving scan head, but instead use a camera photographing a page in a single shot. They therefore tend to be significantly faster than flatbed scanners.

For most DP volunteers commercial planetary scanners will be out of financial reach: the cheapest one I know of costs 5000 USD, excluding the cameras. However, it may be possible to build your own planetary scanner. After all, they are little more than a stand, a couple of lights, a couple of cameras, and a pc. In other words, a planetary scanner could conceivably be cobbled together from off-the-shelf parts that you have in your home now.

Modern digital compact cameras are cheap yet good enough to be used in DIY scanners. I experimented a little with building such a scanner, though my ineptness as a DIY-er has so far failed me. Nevertheless, my experiments may have taught me a thing or two that it would be worthwhile to pass on (well, one thing really: lights, lights, lights).

By now others have taken up the torch of creating cheap planetary scanners from off-the-shelf components, and the most important link in this section may be the following: www.diybookscanner.org. This is a project that tells you not just of experiments, but also of an actual, working DIY scanner.

(simple test image for determining or fixing the amount of barrel distortion and perspective (PNG)

Public Domain Days

Each year January 1 is international Public Domain Day. This is the day when books in countries that have a Life+XX copyright regime return to the public domain.

Other

Notes

(Memos to self)