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Only Chen
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來自: 台北县
文章: 1024

發 表 於: 2010.11.04 11:21:47 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

How Motion Detection Works in Xbox Kinect

How Motion Detection Works in Xbox Kinect

The prototype for Microsoft's Kinect camera and microphone famously cost $30,000. At midnight Thursday morning, you'll be able to buy it for $150 as an Xbox 360 peripheral. Let's take some time to think about how it all works.

Camera

Kinect's camera is powered by both hardware and software. And it does two things: generate a three-dimensional (moving) image of the objects in its field of view, and recognize (moving) human beings among those objects.

How Motion Detection Works in Xbox Kinect

Older software programs used differences in color and texture to distinguish objects from their backgrounds. PrimeSense, the company whose tech powers Kinect, and recent Microsoft acquisition Canesta use a different model. The camera transmits invisible near-infrared light and measures its "time of flight" after it reflects off the objects.

Time-of-flight works like sonar: If you know how long the light takes to return, you know how far away an object is. Cast a big field, with lots of pings going back and forth at the speed of light, and you can know how far away a lot of objects are.

Using an infrared generator also partially solves the problem of ambient light. Since the sensor isn't designed to register visible light, it doesn't get quite as many false positives.

PrimeSense and Kinect go one step further and encode information in the near-IR light. As that information is returned, some of it is deformed - which in turn can help generate a finer image of those objects' 3-D texture, not just their depth.

With this tech, Kinect can distinguish objects' depth within 1 centimeter and their height and width within 3 mm.

How Motion Detection Works in Xbox Kinect

Figure from PrimeSense Explaining the PrimeSensor Reference Design.

Middleware

At this point, both the Kinect's hardware - its camera and IR-light projector - and its firmware (sometimes called "middleware") are operating. The Kinect has an on-board processor which is using algorithms to process the data to render the three-dimensional image.

The middleware also can recognize people: distinguishing human body parts, joints and movements, as well as distinguishing individual human faces from one another. When you step in front of it, the camera "knows" who you are.

Does it "know" you in the sense of embodied neurons firing, or the way your mother knows your personality or your confessor knows your soul? Of course not. It's a videogame.

How Motion Detection Works in Xbox Kinect

But it's a pretty remarkable videogame. You can't quite get the fine detail of a table tennis slice, but the first iteration of the WiiMote couldn't get that either. And all the jury-rigged foot pads and nunchuks strapped to thighs can't capture whole-body running or dancing like Kinect can.

That's where the Xbox's processor comes in: translating the movements captured by the Kinect camera into meaningful on-screen events. These are context-specific. If a river-rafting game requires jumping and leaning, it's going to look for jumping and leaning. If navigating a Netflix "Watch Instantly" menu requires horizontal and vertical hand-waving, that's what will register on the screen.

It has an easier time recognizing some gestures and postures than others. As Kotaku noted this summer, recognizing human movement - at least, any movement more subtle than a hand-wave - is easier to do when someone is standing up (with all of their joints articulated) than sitting down.

So you can move your arms to navigate menus, watch TV and movies, or browse the internet. You can't sit on the couch wiggling your thumbs and pretending you're playing Street Fighter II. It's not a magic trick cooked up by MI-6. It's a camera that costs $150.

How Motion Detection Works in Xbox Kinect

Audio

Kinect also has a stereo microphone to enable chat and voice commands. The tech on the audio capture is fairly well-known, but it's worth observing that unlike the noise-canceling microphone you might have on your smartphone or laptop's webcam, Kinect has a wide-field, conic audio capture.

This is because, unlike a smartphone, you wouldn't want the Kinect's microphone to capture only sounds close to it: It'd only pick up the sound of the television set. You want it to capture ambient speech throughout the room, such as that emitted by whole groups of people watching sports or playing games.

How Motion Detection Works in Xbox Kinect

Screenshot from Kinect Sports Hurdles

A traditional videogame controller is individual and serial: It's me and whatever I'm controlling on the screen versus you and what you're controlling. We might play cooperatively, but we're basically discrete entities isolated from one another, manipulating objects in our hands.

A videogame controller is also a highly specialized device. It might do light work as a remote control, but the buttons, d-pads, joysticks, accelerometers, gyroscopes, haptic feedback mechanisms and interface with the console are all designed to communicate very specific kinds of information.

Kinect is something different. It's communal, continuous and general: a Natural User Interface (or NUI) for multimedia, rather than a GUI for gaming.

But it takes a lot of tech to make an interface like that come together seamlessly and "naturally."

(gizmodo)

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Tommy Chung
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來自: 美加
文章: 1102

發 表 於: 2010.11.05 11:52:38 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

Microsoft kinect spills its guts for ifixit

The dudes over at iFixit just love to rip stuff apart. Now, on the launch day of Microsoft’s much anticipated Xbox 360 Kinect peripheral, they stripped one of these set-top gadgets down to its bare essence.

ifixit_kinect_teardown_1

With the Kinect priced at $149 (USD), I figured there’d be a significant amount of complexity inside the device, and that’s exactly what the iFixit guys found. They had to remove no less than 4 different types of Torx security screws and a sticky rubber pad to crack it open.

ifixit_kinect_teardown_2

Once inside, they found the following goodies: four microphones for speech recognition and directional detection, an infrared camera and accompanying IR projector for depth detection, and one standard (640×480) camera for visual recognition. The brains behind the operations are a PrimeSense PS1080-A2 image processor, a Marvell AP102 system-on-a-chip, along with 64MB of DDR2 SDRAM, among other things. There’s also a motor for moving the gadget, and a three-axis accelerometer, presumably used for improving the motor’s accuracy. And as we all know by now, all that gear requires more power than a standard USB connector can provide, using 12-watts of power. There’s even a tiny fan inside to keep things nice and cool.

ifixit_kinect_teardown_4

We’ve only got a few of the photos here, but you can check out the entire teardown over at iFixit now. (Their site is getting inundated with traffic at the moment, so you might have to try again in a little bit.)

(technabob)

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Tommy Chung
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來自: 美加
文章: 1102

發 表 於: 2010.12.01 11:02:30 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

Microsoft Files for Patent on Touchy-Feely Screens

A recent Microsoft patent could add a new dimension to touchscreen technology. The concept uses light-induced shape-memory polymers that would allow the screen to actually change its topography with the image, providing the sensation of touching actual buttons. Don't expect to see it on the next Windows Phone, though -- practical uses for such an invention are still years away.

Microsoft (Nasdaq: MSFT) has filed a patent application for a display screen that would dynamically give users the feeling of pushing buttons when they touch it.

It filed patent application 20100295820 last week.

The patent's for a "light-induced shape-memory polymer display screen" that would give users the sensation of actually touching buttons as they're displayed on a touchscreen.

At least one other project that would give users tactile sensations when they put their fingers on a touchscreen is under way elsewhere.

Microsoft Explores Your Feelings

Microsoft's patent describes a device with a display screen that has a topography-changing layer. This layer would consist of a shape-memory polymer activated by light. It would have an imaging engine that would project visible light onto a display screen and a topography-changing engine projecting ultraviolet (UV) light onto the screen.

The UV light would, in essence, command the shape-memory layer to create buttons on the screen as required. This could provide a virtual keyboard users can interact with.

The screen would also have a reference engine that would project infrared (IR) light onto the screen and a touch-detection engine that would detect when the screen was touched. The lights would impact the polymer layer pixel by pixel.

Microsoft's patent proposes using cinnamic acid groups for light detection. The E-isomeric form of cinnamic acid can be converted to the Z-isomer through irradiation with UV light. The technology would apparently be used first in large devices.

"A simple application would be to use this technology to create a true tactile touch keyboard where you could actually feel the keys under your fingers," Carl Howe, director of anywhere consumer research at the Yankee Group, told TechNewsWorld.

Microsoft declined comment on the patent.

Other Efforts With Touchscreen Technology

Disney Research in Pittsburgh, Penn., is also working on a project to provide tactile feedback to touchscreens.

Its TeslaTouch project uses the electrovibration principle to provide tactile feedback to users of a touchscreen. Electrovibration, like mechanical vibration, it is a type of tactile sensation.

A handheld prototype was created in collaboration with Mark Baskinger of the Carnegie-Mellon University School of Design.

The prototype measures 35 by 4 by 40 mm and uses 8 volts of electricity to generate tactile feedback. An electrostatic force attracts the user's fingers to the interactive surface, so the user doesn't receive an electric charge. The input signal is spread uniformly across the touch surface.

TeslaTouch technology can be added to devices ranging from small handheld items to large multitouch collaborative surfaces. However, the user must be grounded for best results. For larger devices, this can be achieved by users wearing antistatic wristbands or sitting or standing on grounded pads. For mobile devices, the back of the device's case serves to ground it when the user holds the device.

Uses of Tactile Feedback

It's difficult right now to predict exactly where this type of tactile technology might be used on a large scale.

"Ideally, this would be for devices with screens which come closer to laptops and smartphones than they do to desktops," Rob Enderle, principal analyst at the Enderle Group, told TechNewsWorld.

"However, initially monitors for existing PCs and other devices are more likely to be easier to use with this technology because the initial cost of the panel will likely limit the market significantly," he added.

The design is part of the problem with the technology.

"The patent puts several constraints on the display and, as of now, I don't see such constrained displays -- ones where have multiple projectors behind them -- having a ton of utility," the Yankee Group's Howe pointed out.

However, there might be niche applications, such as in the command and control center of a battleship, where the tactile feedback would help users remain oriented while the vessel is pitching and yawing, Howe suggested.

However, practical use for the technology might be some ways off.

"It'll likely be seven to 10 years before the technology exists outside the lab in limited runs and over 10 years before it hits the broader market," Enderle opined.

(technewsworld)

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Only Chen
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來自: 台北县
文章: 1024

發 表 於: 2010.12.03 11:54:49 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

Kinect now offers a stealth mode, courtesy of optical camouflage hack (video)

http://www.engadget.com/2010/12/02/kinect-now-offers-a-stealth-mode-courtesy-of-optical-camouflage/

 

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Tommy Chung
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來自: 美加
文章: 1102

發 表 於: 2010.12.10 11:16:57 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

微軟將在IE 9加入防止隱私追蹤功能

http://www.zdnet.com.tw/news/software/0,2000085678,20148449,00.htm

 

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Tommy Chung
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來自: 美加
文章: 1102

發 表 於: 2010.12.14 10:36:32 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

Kinect minority report hack: fingers detected!

Engineers from MIT CSAIL have figured out out how to get the Xbox 360 Kinect to not just sense larger body movements, but to actually detect individual fingertips in mid-air.

kinect-minority_report-hack_mit

They used the data points to replicate a rudimentary version of the gesture interfaces seen in Minority Report – sans gloves, of course.The guys used something called the Point Cloud Library from Willow Garage’s open source robotic control package ROS.

Here’s a video of the hack in action:

One can only hope that some games start to surface that take advantage of individual finger movements. I could see this coming in handy for puzzle games, and maybe something like the part of Bioshock where you hack into the security system – this would be a much cooler way to test your dexterity. Also, for virtual porn.

If you’re interested in giving this a shot for yourself, you’ll need to grab the ROS Kinect code here, and MIT’s code here. I’m not sure exactly what else you need to do to make it all work though, so install at your own risk.

(technabob)

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Only Chen
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來自: 台北县
文章: 1024

發 表 於: 2010.12.22 11:56:07 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

Microsoft Opens HTML5 Proving Ground

Web developers will have a chance to explore and tweak emerging yet unstable standards in Microsoft's new HTML5 Labs site. "At this point, HTML5 standards are moving targets," Pund-IT's Charles King stated. "But it's better for developers to get involved early and tweak their offerings along the way than to start late and deliver half-baked offerings."


"3 Payment Security Myths and Their Truths" - Payment Security goes beyond PCI Compliance. Understand 3 key myths and how they impede success, and learn an approach to Enterprise Payment Security to achieve successful Tokenization and PCI Compliance, without touching sensitive payment data. Learn more.

Microsoft (Nasdaq: MSFT) launched an HTML5 laboratory for developers on Tuesday. The company intends the project to be a site where Redmond prototypes early and unstable Web standard specs from standards bodies such as the W3C and shares them with the developer community.

One reason for establishing the lab could be that Microsoft wants to leverage its strong relationship with developers for the Web.

Microsoft could also be playing catch-up with Google (Nasdaq: GOOG), which launched its HTML5-based Body Browser last week, and with Mozilla's Firefox browser.

(technewsworld)

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Tommy Chung
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來自: 美加
文章: 1102

發 表 於: 2010.12.24 11:35:15 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect

Windows 8 on ARM, but don't hold your breath

All signs point to the next version of Windows running on ARM, the emerging global silicon standard for smartphones and tablets. But don't get too excited--it won't happen until 2012 at the earliest and just as likely not until 2013.

Unless Windows 7 tablets like the Archos 9 take the world by storm--not likely--consumers will have to wait for Windows 8.

Unless Windows 7 tablets like the Archos 9 take the world by storm--not likely--consumers will have to wait for Windows 8.

(Credit: CNET Reviews)

For now, let's call the next major release from Redmond Windows 8--though I'm hearing that Microsoft will call it something else. More importantly, I'm also hearing that Windows 8 isn't due until the fourth quarter of 2012, at the earliest.

So that means tablets running Windows 8 won't appear until 2013. Microsoft could do something in the interim with a technology such as a future version of Windows CE but that's not the Windows we all know and love.

A lot can happen in two years and a lot of that on tablets and smart devices running on Google's and Apple's operating systems--not Windows. "Time after time in the high tech industry you see these companies that are successful in one market can't make the leap into the next phase because they're so busy serving their installed base," said Linley Gwennap of the Linley Group, a chip consulting firm.

Granted, that installed base is still the envy of the tech world: both Microsoft and Intel have a plum position serving a global computer market measured in the hundreds of billions of dollars.

But that doesn't mean both of those companies are going to lead the next computing revolution, or even evolution. Many consumers look at the iPad and see a device that represents the future of personal computing. While they don't know--or care--that it runs on a power-frugal ARM processor and slimmed-down version of Apple's OS X, both of those technologies are the foundation for its appeal.

And that future began last April when the iPad was released. "Apple is one of those companies that is really good at bringing out the next product that obsoletes their previous products," Gwennap said. That is a crucial point. Apple is bold enough to entertain the possibility of ultimately cannibalizing its own MacBook product line (it's not hard to imagine next-generation iPads that increasingly impinge on the feature set of the MacBook Air) with the iPad because it knows it has to create new markets to be successful.

Not to rain too much on the Windows-on-ARM parade, but Windows on other platforms--such as outside of Intel's x86--has not fared well, either. Full-featured versions of Windows--what used to be called Windows NT--ran on PowerPC, MIPS, and Alpha processors. However, support for all three platforms was phased out. While certainly ARM holds more promise for Microsoft than DEC's Alpha technology ever did, it doesn't mean that Windows will necessarily be successful on ARM.

And that chance for success gets dimmer every month that Microsoft doesn't bring out a fully optimized version of Windows for tablets. So, the prospect of Windows 8 in 2012 will stick out as a symbol of WinTel's complacency. And how much bigger does Apple (which President Obama cited today in a news conference as an American success story) need to get before it begins to eclipse both of those companies, combined? We should know by 2012.

(cnet)

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Tommy Chung
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來自: 美加
文章: 1102

發 表 於: 2010.12.24 11:52:16 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect
檢視會員個人資料個人資料 回覆文章 回頂端

Tommy Chung
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來自: 美加
文章: 1102

發 表 於: 2011.01.10 11:24:05 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect
檢視會員個人資料個人資料 回覆文章 回頂端

Tommy Chung
(不在線上)
nbsp;
來自: 美加
文章: 1102

發 表 於: 2011.01.10 11:53:30 AM
文章主題: Re: 沉浸多時的微軟,發表電視遊樂器的人體動作感應視訊遊戲系統Kinect
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