Hallo,

ich kann dir nur sagen wie das unter Matlab mit der Image Acquisition Toolbox funktionieren würden, keine Ahnung ob dir das hilft. Ich arbeite mit Logitech QickCam Pro 9000 Kameras. Da würde es so ablaufen:


Code:
% erstmal videoobjekt erzeugen
vid = videoinput('winvideo', 1, 'RGB24_640x480')

Summary of Video Input Object Using 'Logitech QuickCam Pro 9000'.

   Acquisition Source(s):  input1 is available.

  Acquisition Parameters:  'input1' is the current selected source.
                           10 frames per trigger using the selected source.
                           'RGB24_640x480' video data to be logged upon START.
                           Grabbing first of every 1 frame(s).
                           Log data to 'memory' on trigger.

      Trigger Parameters:  1 'immediate' trigger(s) on START.

                  Status:  Waiting for START.
                           0 frames acquired since starting.
                           0 frames available for GETDATA.

% die eigenschaften des objets anzeigen
vid_src = getselectedsource(vid);

set(vid_src)
  General Settings:
    Tag

  Device Specific Properties:
    BacklightCompensation: [ {on} | off ]
    Brightness
    Contrast
    Exposure
    ExposureMode: [ {auto} | manual ]
    Focus
    FocusMode: [ {auto} | manual ]
    FrameRate: [ {30.0000} | 25.0000 | 20.0000 | 15.0000 | 10.0000 | 5.0000 ]
    Gain
    HorizontalFlip: [ {off} | on ]
    Saturation
    Sharpness
    VerticalFlip: [ {off} | on ]
    WhiteBalance
    WhiteBalanceMode: [ {auto} | manual ]

% jetze einfach mal ein preview vom stream starten
preview(vid)

% autofocus ausschalten
set(vid_src, 'FocusMode', 'manual')

% autofocus wieder einschalten
set(vid_src, 'FocusMode', 'auto')
Vielleicht hilft's dir weiter.

Gruß
Malte