如果您使用过Windows 8.1或至少阅读过它，您可能会遇到一个名为Hands-Free Mode的功能。顾名思义，它是关于在没有双手的情况下使用 Windows 8.1 设备。但它是如何工作的？有什么好处吗？让我们从本指南中找出答案。
什么是Windows 8.1(Windows 8.1)中的免提模式(Mode)？
此功能专为具有触摸屏和摄像头的平板电脑或混合设备而设计。免提模式(Hands-Free Mode)使用Windows 8.1设备上的摄像头来监控您的手部动作，并在支持此功能的Windows 8.1应用程序中执行基本导航。(Windows 8.1)借助免提模式，您可以在(Hands-Free Mode)Windows 8.1应用程序中前后导航，而无需触摸设备上的屏幕。这在几种情况下非常有用。
如何在Windows 8.1中使用免提模式(Mode)
在本文发表时，免提模式(Hands-Free Mode)仅在 Windows 8.1的Food & Drink应用程序中可用。(Food & Drink)
启动应用程序并浏览(app and browse)可用的食谱。当你发现一个有趣的文本食谱(text recipe)时，打开它。显示配方以及底部的上下文菜单。如果菜单未显示，则向上滑动。
在底部的上下文菜单中，单击或点按(click or tap) 免提模式(Hands-Free Mode)。
如果您之前没有使用过此功能，系统会询问您Bing Food & Drink是否可以使用您的网络摄像头。您必须单击或点击允许(Allow)，否则免提模式(Hands-Free Mode)将不起作用。
然后，您将看到免提模式(Hands-Free Mode)如何工作的教程。花点时间查看它。
在您的设备上使用免提模式(Hands-Free Mode)时，请将其视为在中间某处打开的书。
要移动到下一页，请用右手抓住当前页面并将其移动到左侧。因此，要移动到下一页，您必须在相机前从右向左滑动右手。
要移动到上一页，您可以用左手抓住当前页面并将其向右移动。后退的手势包括在镜头前的相同动作。
如教程所示，要确认您已获得它，请将右手从右侧移到左侧，在相机前面。然后，打开您选择的食谱。
当您准备好移至下一页时，请执行适当的手势。
如您所见，您可以在烹饪时轻松浏览食谱，而不会弄脏屏幕(screen dirty)。
如何打开或关闭免提模式(Mode)
如果您不想再使用免提模式(Hands-Free Mode)，请单击或点击屏幕右上角的免提开启(Hands-Free ON)按钮。
要重新打开它，请单击或点击免提关闭(Hands-Free OFF)按钮。
另一种关闭它的方法是在不启用免提模式的(Hands-Free Mode)情况下打开您想要查看的食谱并查看它。
如何打开免提教程(Hands-Free Tutorial)
当您第一次启动免提模式(Hands-Free Mode)时，会显示有关如何使用它的教程。第二次使用它时，该教程将被禁用，因为Food & Drink应用程序假定您知道如何使用它。
如果你想打开教程再看一遍，你可以。打开Food & Drink应用程序，调出魅力。转到设置(Settings)，然后转到选项(Options)。
在“选项(Options)”窗格中，查找名为“显示免提教程”("Show Hands-Free tutorial")的开关。将其设置为ON。
该教程将在您下次使用免提模式(Hands-Free Mode)时显示。
免提模式(Hands-Free Mode)的局限性(Limitations)
这个特性在这一点上是相当实验性的，它不能很好地工作。在使用它时，我遇到了以下限制：
- 如果您有台式电脑，即使您有网络摄像头(web camera)，此功能也无法使用。在我的 PC 上，我有一个Microsoft Lifecam，这并不重要。免提模式(Hands-Free Mode)拒绝打开。
- 虽然前进的手势通常效果很好，但当你想倒退时事情会变得复杂。免提模式(Hands-Free Mode)很难记录我向后移动的手势。
- 此功能仅适用于为其提供支持的应用程序。到目前为止，它仅由Microsoft在其Food & Drink应用程序中实施。我还没有听说过第三方开发商提供支持此功能的应用程序。
如果您在使用此功能时发现了其他限制，请不要犹豫，使用下面的评论表分享它们。
结论
正如您从本指南中看到的那样，免提模式(Hands-Free Mode)是一个有趣的实验，目前它在烹饪时很有用。但是，此功能可以用于具有不同使用场景的各种应用程序。我希望更多的应用程序会为其提供支持，并且微软(Microsoft)会花一些时间来改进它的工作方式。
在使用它时，我不禁想到我多么希望看到下一代Surface平板电脑采用类似 Kinect 的技术(Kinect-like technology)，它可以以比免提模式(Hands-Free Mode)更精确的方式使用，并且不仅仅是来回浏览应用程序内部。你怎么看？那不是很好吗？
Simple Questions: What is Hands-Free Mode in Windows 8.1?
If you have used Windows 8.1 or at least read about it, you might have encountered a feature named Hands-Free Mode. As the name implies, it is about using your Windows 8.1 device without your hands. But how does it work? Is it any good? Let's find out from this guide.
What is Hands-Free Mode in Windows 8.1?
This feature is designed for tablet or hybrid devices that have a touch screen and a camera. Hands-Free Mode uses the camera on your Windows 8.1 device to monitor your hand movements and perform basic navigation inside Windows 8.1 apps that provide support for this feature. With Hands-Free Mode you can navigate back and forward inside Windows 8.1 apps without touching the screen on your device. This can be very useful in several scenarios.
How to Use Hands-Free Mode in Windows 8.1
At the time this article was published, Hands-Free Mode was available only in the Food & Drink app, in Windows 8.1.
Start the app and browse through the available recipes. When you find a text recipe that is interesting, open it. The recipe is displayed as well as the contextual menu on the bottom. If the menu is not displayed, then swipe upwards.
In the contextual menu on the bottom, click or tap Hands-Free Mode.
If you haven't used this feature before, you are asked whether Bing Food & Drink can use your webcam. You must click or tap Allow, otherwise Hands-Free Mode won't work.
Then, you are shown a tutorial of how Hands-Free Mode works. Take a moment to view it.
When using Hands-Free Mode on your device, think of it as a book that's opened somewhere in the middle.
To move to the next page, you take your right hand, grab the current page and move it to the left. Therefore, to move to the next page, you have to swipe your right hand in front of the camera, from right to left.
To move to the previous page, you take your left hand, grab the current page and move it to the right. The gesture for going back involves this same movement in front of the camera.
To confirm that you got it, move your right hand from the right side to the left, in front of the camera, as shown by the tutorial. Then, the recipe you selected is opened.
When you are ready to move to the next page, perform the appropriate gesture.
As you can see, you can easily navigate through recipes without getting the screen dirty, while you cook.
How to Turn On or Off Hands-Free Mode
If you no longer wish to use Hands-Free Mode, click or tap the Hands-Free ON button on the top-right of the screen.
To turn it back on, click or tap the Hands-Free OFF button.
Another way to turn it off is to open the recipe you want to see and view it without enabling Hands-Free Mode.
How to Turn On the Hands-Free Tutorial
When you start Hands-Free Mode for the first time, a tutorial is shown about how to use it. When using it a second time, the tutorial is disabled because the Food & Drink app assumes you know how to use it.
If you want to turn on the tutorial and see it again, you can. With the Food & Drink app opened, bring up the charms. Go to Settings and then to Options.
In the Options pane, look for the switch that's named "Show Hands-Free tutorial". Set it to ON.
The tutorial will be displayed the next time you use Hands-Free Mode.
The Limitations of the Hands-Free Mode
This feature is rather experimental at this point and it doesn't work very well. While using it, I have encountered the following limitations:
- If you have a desktop PC, this feature won't work even if you have a web camera. On my PC I have a Microsoft Lifecam and it just doesn't matter. Hands-Free Mode refuses to turn on.
- While the gestures for moving forward work generally well, things get complicated when you want to go backwards. Hands-Free Mode had a very hard time registering my gestures for moving back.
- This feature works only with apps that provide support for it. So far it was implemented by Microsoft only in their Food & Drink app. I haven't heard of third-party developers providing apps that support this feature.
If you have found other limitations when working with this feature, don't hesitate to share them using the comments form below.
Conclusion
As you can see from this guide, Hands-Free Mode is an interesting experiment that, for now, can be useful while cooking. However, this feature can be used for all kinds of apps with different usage scenarios. I hope more apps will provide support for it and that Microsoft will spend some time improving the way it works.
While using it, I couldn't help think how I would love to see the next generation of Surface tablets with Kinect-like technology that can be used in a more precise way than Hands-Free Mode and for much more than browsing back and forward inside apps. What do you think? Wouldn't that be great?
