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Using USB host mode to connect to a cheap PC webcam

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mzoran
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2010/05/06 15:47:27 (permalink)
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Using USB host mode to connect to a cheap PC webcam

I've experimented some with embedded cameras and they either have a composite analog output, have a very complex digital signal, or have a very unreliable UART interface.

I know a USB video standard exists, but I was wondering if anybody knows if most of the cheap USB webcames one finds at the local electronics or discount store follow the standard or if they use proprietary drivers.

My thinking is that maybe it might be possible to use a microcontroller( such a as PIC24 or PIC32 ) to read video data from the camera.
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    DarioG
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    RE: Using USB host mode to connect to a cheap PC webcam 2010/05/06 15:55:37 (permalink)
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    Never tried that.
    I've used /installed some several webcams, and I think that in more recent XP versions there has to be some standard driver since thay can install (and show as peripherals in the My Computer icon) without their disk.

    Hope you can work it out Smile

    GENOVA :D :D ! GODO
    #2
    xiaofan
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    RE: Using USB host mode to connect to a cheap PC webcam 2010/05/06 16:47:08 (permalink)
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    I think most of the cheap webcams now conforms to the UVC standard. They will be supported by XP SP2, Vista and WIn7.
    http://en.wikipedia.org/wiki/USB_video_device_class

    I have the cheap Microsoft VX-800, it does not even come with a disk.

      USB_Links and libusb
    #3
    chinzei
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    RE: Using USB host mode to connect to a cheap PC webcam 2010/05/06 21:48:17 (permalink)
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    Maybe, most of webcams are configured to work just on high-speed, for the bandwidth of video streaming. I've examined four webcams from different manufacturers. All of them has no streaming interface on Other_Speed_Config.

    If you find a webcam which has a streaming interface on full-speed (Other_Speed_Config), it's valuable information.
    Please let us know about the manufacturer and model number.
    I want to try it.

    Tsuneo
    #4
    DarioG
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    RE: Using USB host mode to connect to a cheap PC webcam 2010/05/07 01:37:36 (permalink)
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    Thank you guys.

    GENOVA :D :D ! GODO
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    xiaofan
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    RE: Using USB host mode to connect to a cheap PC webcam 2010/05/07 02:36:33 (permalink)
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    I am sure that my old webcam a few years back (2000-2002?) is USB Full Speed only. But I do not have it any more and it may well be not compatible with the USB UVC standard.

      USB_Links and libusb
    #6
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