blocks|key|3192354|text|大力神相机是符合紫外线标准的，因此它们应该与DirectShow接口IAMCameraControl一起工作。您可以将焦点设置为特定值，并使用标志将其设置为不希望它自动。您可以使用IAMCameraControl::Get来轮询当前状态，因为并非所有相机都支持关闭焦点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3192355|IAMCameraControl+*pCameraControl;+
HRESULT+hr;+
hr+=+pFilter->QueryInterface(IID_IAMCameraControl,+(void+**)&pCameraControl);+
if+(hr+==+S_OK)+{
++long+defaultFocusValue;
++hr+=+pCameraControl->GetRange(CameraControl_Focus,
++++++++++++++++++++++++++++++++NULL,+//+min
++++++++++++++++++++++++++++++++NULL,+//+max
++++++++++++++++++++++++++++++++NULL,+//+minstep
++++++++++++++++++++++++++++++++&defaultFocusValue,+//+default
++++++++++++++++++++++++++++++++NULL);+//+capflags
++hr+=+pCameraControl->Set(CameraControl_Focus,+//+property
+++++++++++++++++++++++++++defaultFocusValue,+//+value
+++++++++++++++++++++++++++CameraControl_Flags_Manual);+
}+|code-block|syntax|javascript|3192356|Focus有一个由每个摄像头单独定义的范围，所以你应该按照图中所示进行查询，以找到默认值和最小值、最大值。在本例中，pFilter是指向您从DirectShow获得的输入过滤器的指针。你可以通过enumerating+the+devices获得它，然后找到你想要的。|3192357|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/dd389145(VS.85).aspx)|1|http://msdn.microsoft.com/en-us/library/dd407292(VS.85).aspx^0|2I|L|Y|G|0|0|0|1M|7|2P|N|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|M|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

The Hercules cameras are UVC compliant, so they should work with the DirectShow Interface <a href="http://msdn.microsoft.com/en-us/library/dd389145(VS.85).aspx" rel="noreferrer">IAMCameraControl</a>. You can set the focus to a specific value, and use the flags to set that you do not want it to be automatic. You can use <code>IAMCameraControl::Get</code> to poll the current state, because not all cameras do support turning off the focus.

<pre><code>IAMCameraControl *pCameraControl; 
HRESULT hr; 
hr = pFilter-&gt;QueryInterface(IID_IAMCameraControl, (void **)&amp;pCameraControl); 
if (hr == S_OK) {
 long defaultFocusValue;
 hr = pCameraControl-&gt;GetRange(CameraControl_Focus,
 NULL, // min
 NULL, // max
 NULL, // minstep
 &amp;defaultFocusValue, // default
 NULL); // capflags
 hr = pCameraControl-&gt;Set(CameraControl_Focus, // property
 defaultFocusValue, // value
 CameraControl_Flags_Manual); 
} 
</code></pre>

Focus has a range which is defined by each camera separately, so you should query it as shown to find the default value and the min, max if you want.
In this example the <code>pFilter</code> is a pointer to the input filter that you have from DirectShow. You can get it by <a href="http://msdn.microsoft.com/en-us/library/dd407292(VS.85).aspx" rel="noreferrer">enumerating the devices</a> and finding the one you want.

blocks|key|932100|text|尝试使用uvcdynctrl，其中-l标志将列出功能，-s可用于设置任何功能http://manpages.ubuntu.com/manpages/natty/man1/uvcdynctrl.1.html|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|932101|entityMap|0|LINK|mutability|MUTABLE|url|http://manpages.ubuntu.com/manpages/natty/man1/uvcdynctrl.1.html^0|4|A|12|1S|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Try using uvcdynctrl
where -l flag shall list you the features
and -s can be used to set any feature
<a href="http://manpages.ubuntu.com/manpages/natty/man1/uvcdynctrl.1.html" rel="nofollow">http://manpages.ubuntu.com/manpages/natty/man1/uvcdynctrl.1.html</a>

blocks|key|5509698|text|在、OpenCV、和Python的帮助下，你可以很容易地做到这一点：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|5509699|cap+=+cv2.VideoCapture(1)+#+my+webcam+cap.set(3,+1280)+#+set+the+resolution+cap.set(4,+720)+cap.set(cv2.CAP_PROP_AUTOFOCUS,+0)+#+turn+the+autofocus+off|CODE|5509700|我用的是OpenCV+3.1.0-dev，Python2.7.5和罗技HD+Pro网络摄像头C920|5509701|entityMap^0|1|8|0|0|47|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|P|8|@$9|Q|A|R|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|S|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|L|$]]

With the a little help of OpenCV and Python you can do this very easy:

<code>cap = cv2.VideoCapture(1) # my webcam
cap.set(3, 1280) # set the resolution
cap.set(4, 720)
cap.set(cv2.CAP_PROP_AUTOFOCUS, 0) # turn the autofocus off</code>

I use OpenCV 3.1.0-dev, Python 2.7.5 and the Logitech HD Pro Webcam C920

I am trying to do computer vision using a webcam (the model is Hercules Dualpix). I know it is not the ideal camera to use, but I have no choice here. 

The problem is the auto-focus makes it hard/impossible to calibrate the camera. Anyone knows a way to disable the auto-focus feature. Or, if someone has an idea to deal with it and calibrate the camera with the auto-focus.

How to programmatically disable the auto-focus of a webcam?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试使用网络摄像头进行计算机视觉(模型是Hercules Dualpix)。我知道这不是理想的相机，但我别无选择。问题是自动对焦使得校准相机变得困难/不可能。任何人都知道禁用自动对焦功能的方法。或者，如果有人有一个想法来处理它，并校准相机与自动对焦。

问如何以编程方式禁用网络摄像头的自动对焦？
EN

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问如何以编程方式禁用网络摄像头的自动对焦？EN