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Does FreeBSD support in any way the TWAIN API? If not, what is the API that could be used to read data from imaging devices (webcams) - preferably in a portable way.

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The FOSS scanner/imaging API is SANE. You may need to install Linux compatibility files in order to allow it to access the webcam as a V4L device.

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This is the layer for compatibility with Video4Linux in FreeBSD freshports.org/multimedia/webcamd. –  Juan Francisco Cantero Hurtado Aug 17 '11 at 1:25

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