[Daniel] at diybookscanner.org posted a roundup of the best automatic book scanner builds to date. A lot of the comments on our last coverage of book scanners were summed up by [Spork] with, “No automatic page turning = no use.” Turning a page in a book with a robot is really hard, though, and these builds do a really amazing job at automating very tedious work.

First up is [jck57]‘s servo actuated auto scanner. From the video, this build is very good and we caught it skipping only one page. Check out the video in action and the overview.

Next up is the Berlin Hackerspace c-base’s vacuum box scanner. The video shows a large diamond-shaped box with a vacuum cleaner hose attached to the top. The box is pressed down into the binding of the book where the vacuum picks up the next page. The build is a manual version of this very expensive machine, but does have the bonus of not poking a centuries-old book with robotic manipulators.

[dtic] was one of the first people to look into automatic page turning. His prototype (video here) uses servos, but has a very simple construction. The downside is that the book can only scan one side of the book at a time; to get other side, the user would have to turn the book upside down and scan it again.

Project Gado was an unsuccessful Kickstarter campaign whose goal was to develop a scanner to archive photos at Johns Hopkins University. The build used a vacuum-powered suction cup to lift pages onto a flatbed scanner. It’s a lot slower than some of the other builds, but we think there would be less of a risk of skipping a page.

As for processing the images captured by a digital camera, [Steve]‘s book scan wizard handles a lot of the necessary post processing tasks. Converting everything to a PDF, changing the DPI, and putting all the pages in order can be done with [Steve]‘s app. Download here.

Turning a page of a book is a very hard problem – books are designed for hands, not grippers. If you’ve got a book scanner build you’d like to show off, send it in on the tip line. We’ll be sure to put it up.

Like any learned individual, [Justin] has a whole mess of books. Not being tied to the dead-tree format of bound paper, and with e-readers popping up everywhere, he decided to build a low-cost book scanner so an entire library can be carried in a his pocket. If that’s not enough, there’s also a complementary book image processor to assemble the individual pictures into a paginated tome.

The build is pretty simple – just a little bit of black craft board for the camera mount and adjustable book cradle. [Justin] ended up using the CHDK software for the Cannon PowerShot camera to hack in a remote trigger. The scanner can manage to photograph 600 pages an hour, although that would massively increase if he ever moves up to a 2-camera setup.

We’re wondering if OCR could be applied to this build – it’s nice to have an image of a page on your computer, but searchable text would be amazing. If you have experience or a story about a massive OCR job, be sure to leave a note in the comments. Check out the videos below for a walk-through of the build and a demo of the operations.

[Kenneth] is a Mechanical Engineer who likes to dabble in electronics. Besides providing us with an excellent picture of his workbench, he has put together a list of things that you’ll need as you learn to work with electronics. A beginner electronics kit from one of a number of different sources may work for some, but others may not be interested in a kit.

[Kenneth] gives links and recommendations for categories of: books, electrical equipment, development tools, components, digital electronics, and analog chips. As he puts it, this post is a “gigantic list of everything I would buy right now to replace my entire workshop if mine were to disappear.”  This is a great list of things you may need if you’re starting out.  If you have some experience, this list may introduce you something new. Check out some of [Kenneth's] other projects like his cloud chamber or the Chumby webserver that he made.

[Steve] was tired of looking at the speakers in his workshop and began searching around for something a little more aesthetically pleasing. Having recently received a set of hollowed out books used for hiding things as a gift, he thought that he might be able to solve his speaker issue in a similar fashion.

He grabbed a couple of books from a local thrift store and promptly removed the pages. They were replaced with cloth-covered plywood to make the device more sturdy while simulating the look of pages.

He mounted his speaker inside one of the books, and in a second installed a small 7W Class A amplifier. A third book houses a padded compartment to hold his iPod, completing the set.

[Steve] reports that the speakers are pretty much undetectable, and the sound quality is decent too. In fact, we’ve started looking for some old books to re-purpose in our workshop as well.

PBS Newshour did a piece on robots. They talked about NASA’s bot pictured above, Asimo, Big Dog, PR2, Robbie the robot and a few others. We didn’t see anything new, but we really do like the coverage getting out there. We also never need an excuse to watch that guy kick big dog around for a while. We know it’ll only be a matter of time before the tables are turned.

Willow Garage, the folks behind PR2, are conducting a survey to see what your favorite robot is. Their list is pretty short, but they did leave a spot for you to add a name. The picture above, is not from willow garage though. This is the picture I got from BotJunkie (we love this site) where I found this story. They didn’t attribute the artist, but I feel they need credit, it is an awesome shirt.

It turns out that it is a t-shirt design available at the chopshopstore. You can see that their eyes are done in glow-in-the-dark material. On a side note, the hackaday store just got glow in the dark material yesterday(as well as a re-design) and will be announcing several new designs in the near future.

I personally inherited several huge boxes full of sci-fi pulp. The robots I’ve seen in these are amazing, ranging from amazingly ridiculous to amazingly awesome. I’ve only just begun scanning in the covers, and plan to post at least one a day. You know what would be awesome though? If I had one of these.

SparkFun’s free day came and went as entertainment for some and an infuriating event for others. They filmed some video in their office during the madness to give us a look at how it went on their end. We find it amusing that Solarbotics, one of their competitors, sent them flowers with a card reading “Rest in Peace SparkFun”.

According to [Nate's] original post, the concept of free day was inspired by reading [Chris Anderson's] book “Free: The Future of a Radical Price”. We recently finished reading this wonderful work and we’re making it our next book recommendation. [Chris] is editor-in-chief of Wired and has had a ring-side seat as the digital world rose around us. He takes a historical look at what the price of free really means, defining cost by adding more terms like Gratis and Libre to the mix. If you have a good handle on the companies that have defined the 21st Century business model so far you wont’ be able to put this book down.

Now, we should mention something that is remotely related to hacking since we try to do that sort of thing around here. The SparkFun post also reminds those folks lucky enough to get a $100 credit to chronicle and share their projects. We’d love to see them too so get your projects written up and send us the dirty details.

Google has acquired reCAPTCHA and plans to use the system for digitizing books. Wait… what? CAPTCHA is the method of requiring a user to type in a visually obscured word to prove they are human. How can this digitize books? The answer is a bit obscure and takes some time to discover, but you’ll have fun along the way.

The Google blog links to a Google TechTalk video on Human Computation as an example of how they plan to use their new acquisition. It’s embedded below but at 51 minutes we figure most won’t watch it all so we did it for you. This fascinating discussion looks at how people are already being tricked into solving CAPTCHA challenges, and shows several tested implementations of getting people to input cognitive data computers cannot, under the guise of playing games.

Spammers have to beat the CAPTCHA system in order to get large numbers of free email accounts.  There have been examples of software overcoming this test such as the greasemonkey script that beat MegaUpload’s security, or Time Magazine’s poll being hacked. But, for the most part, only humans can pass the test. People seeking to bypass millions of CAPTCHA challenges either pay for sweatshop laborers to solve them or, more creatively, they get you to solve them when cruising for porn. This is the proof of concept; we can use people to interpret words computers cannot if we use the right carrot.

Talked about in the video, the ESP game was written in order to correctly tag photographs.  Players are shown pictures and asked to type what they see.  The round keeps going until the two have typed the same word. With a lot of players, and proper safeguards, these tags are incredibly accurate. Furthermore, the game has been very popular and has the potential to accomplish herculean feats in short amounts of time (namely, tag every image in Google’s image search in just a few months).

It seems that Google plans to use these methods to digitize books that are otherwise very difficult to scan with Optical Character Recognition. According to the video, 9 billion human hours were spent playing solitaire in 2003.  What if a small portion of this time could be diverted over to playing games that added to the digitized knowledge cache? If the right type of verification game can be developed it will allow Google to tap society as their typing minions. It’s an interesting proposition and frankly we hope to see it happen.