Idea: eBooks that watch you read
Every device is an eReader these days. Some are dedicated e-ink devices, and some are multipurpose gadgets that have (or will soon have) front-facing cameras. Presumably those cameras are intended for video chat. But as long as the cameras are there, I think eReader software should take advantage of those cameras, too.
Using existing face detection technology, here are some things your eReader could do:
Gather analytics data: Movie studios do test screenings where they gauge how much audiences laugh or cry, and at what point in the movie. Books can’t do that. But what if the book were watching you? It could anonymously (with your consent) send data back to the publisher about where you were in the book when you smiled. This could be good feedback for the author, who would learn which jokes were hits and which were misses.
Dynamically change text size: Instead of setting your preferred font size, you can set your preferred apparent font size. As you move your head closer and further away from the page, the font adjusts accordingly. (Although I can’t come up with a real reason why I would use this feature).
Automatic page scrolling: With eye-tracking, the device could see when you’re reaching the bottom of the page, and scroll accordingly.
Advertising fodder: Imagine an ad for Stephen King’s new book: it’s a photo grid of real people’s faces while they’re engrossed in the pivotal and terrifying chapter where something really gruesome happens. Perhaps the eBook takes the photo without telling you, and it’s saved locally on your device. At the end of the book you get the opportunity to submit it, and you get some cash and a free copy of his next book if they use your photo to advertise this one.
Special edition of 1984: Every time you get to a page with the phrase “Big Brother,” the camera takes a photo of you and posts it on-line.
UPDATE: Well, it didn’t take long for someone to point out in the comments that Wired has already covered this territory. Hrm. I guess I’ll do some more research before I post my other related idea: eye-tracking high dynamic range photos that adjust the exposure according to the part of the image you’re looking at.
Previously: Idea: Fun With Facial Recognition