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<title>Capture</title>
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<h1>Image Capture</h1>
<p>The capture support is designed for live video, it is not for passive
digital cameras that only transfer the already taken pictures. Are valid: USB
cameras (like most Webcams), Firewire (IEEE 1394) cameras, and analog video
capture boards, including TV Tuners. These are called devices.</p>
<p>The capture functions allows you to:</p>
<ul>
<li>list the available devices</li>
<li>connect to a device</li>
<li>configure the device</li>
<li>retrieve an image</li>
</ul>
<p>You can list the installed devices and once you connect to a specific
device you can control its parameters. Each connected device captures data
frames continuously when in Live state otherwise it stays in standby. You can
connect to more than one device at the same time. </p>
<p>Once connected the user can retrieve frames from the device any time. This
can be done with one function call, or inside a closed loop for several
frames, or inside an idle function to periodically update the screen. The user
is not notified when a new frame is available, but every time the user
retrieve a frame, if successful, it is a new frame, old frames are discarded
when a new frame arrives.</p>
<p>Currently it is implemented only in Microsoft Windows. </p>
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