另外還需要的硬體是一支紅外線筆，您也可以到Radio Shack花五美元買材料自己做一個，內含電池、按鈕及紅外線LED，它打開了，您們看不到－我只要按下按鈕即可打開，現在，如果我開始執行這個軟體，相機就能看見紅外線光點，我就可以標出相機映像點位置，對應到投影機的映像點位置，這就成了一個互動式白板了（掌聲），只要50美元的硬體，您就能擁有屬於自己的互動式白板，這是Adobe Photoshop（掌聲）。
So, as researchers, something that we often do is use immense resources to achieve certain capabilities, or achieve certain goals. And this is essential to the progress of science, or exploration of what is possible. But it sort of creates this unfortunate situation where a tiny, tiny fraction of the world can actually participate in this exploration or can benefit from that technology. And something that motivates me, and what gets me really excited about my research is when I see simple opportunities to drastically change that distribution, and make the technology accessible to a much wider percentage of the population.
And I'm going to show you two videos that have gotten a lot of attention recently that I think embody this philosophy. And they actually use the Nintendo Wii remote. Now, for those of you who aren't familiar with this device, it's a 40 dollar video game controller. And it's mostly advertised for it's motion sensor capabilities, so you can swing a tennis racket, or hit a baseball bat. But what actually interests me a lot more is the fact that in the tip of each controller is a relatively high-performing infrared camera. And I'm going to show you two demos of why this is useful.
So here I have my computer setup with the projector, and I have a Wii remote sitting on top of it. And for example, if you're in a school that doesn't have a lot money, which is probably a lot of schools, or if you're in an office environment, and you want an interactive whiteboard, normally these cost about two to three thousand dollars. So what I'm going to show you how to do is how to create one with a Wii remote. Now, this requires another piece of hardware, which is this infrared pen. You can probably make this yourself for about five dollars with a quick trip to the Radio Shack. It's essentially got a battery, a button and an infrared LED, and it turns on -- you guys can't see it -- but it turns on whenever I push the button. Now, what this means is that if I run this piece of software, the camera sees the infrared dot, and I can register the location of the camera pixels to the projector pixels. And now this is like a whiteboard surface. (Applause) So for about 50 dollars of hardware, you can have your own whiteboard. This is Adobe Photoshop. (Applause) Thank you. (Laughter)
但事實上讓我更感興趣的，不是這兩個產品，而是人們如何發現它們，You Tube 確實改變了個人點子傳播到全世界的方法與速度，我只不過是一位在實驗室中用攝影機作研究的人，但頭一週就有上百萬人看到我所做的，短短幾天內，全球的工程師、老師與學生，開始在YouTube上發表使用或變化這套系統的影片，我希望將來能看到更多這樣的影片，同時也希望線上影片傳播能廣為研究社群所接納，感謝聆聽。
Now, the software for this I've actually put on my website and have let people download it for free. And in the three months that this project has been public it's been downloaded over half a million times. So teachers and students all around the world are already using this. (Applause) I want to quickly say that although it does do it for 50 dollars, there are some limitations of this approach. But you get about 80 percent of the way there, for about one percent of the cost. Another nice thing is that a camera can see multiple dots, so this is actually a multi-touch, interactive whiteboard system as well. (Applause)
For the second demo, I have this Wii remote that's actually next to the TV. So it's pointing away from the display, rather than pointing at the display. And why this is interesting is that if you put on, say, a pair of safety glasses, that have two infrared dots in them, what these two dots are essentially going to give you is give the computer an approximation of your head location. And why this is interesting is I have this sort of application running on the computer monitor, which has a 3D room, with some targets floating in it. And you can see that it looks like a 3D room if you can see, kind of like a video game, it sort of looks 3D, but for the most part, the image looks pretty flat, and bound to the surface of the screen. But if we turn on head tracking, the computer can change the image that's on the screen and make it respond to the head movements. So let's switch back to that. (Laughter) (Applause)
So this has actually been a little bit startling to the game development community. (Laughter) Because this is about 10 dollars of additional hardware if you already have a Nintendo Wii. So I'm looking forward to seeing some games, and actually Louis Castle, that's him down there, last week announced that Electronic Arts, one of the largest game publishers, is releasing a game in May that has a little Easter egg feature for supporting this type of head tracking. So -- and that's from less than five months from a prototype in my lab to a major commercial product. (Applause) Thank you.
But actually, to me, what's almost more interesting than either of these two products, is how people actually found out about them. YouTube has really changed the way, or changed the speed, in which a single individual can actually spread an idea around the world. You know, I'm doing some research in my lab with a video camera, and within the first week, a million people had seen this work, and literally within days, engineers, teachers and students from around the world, were already posting their own YouTube videos of them using my system or derivatives of this work. So I hope to see more of that in the future, and hope online video distribution to be embraced by the research community. So thank you very much.