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how can I change webcam zoom

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mskhalili

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hi,

I can connect a web cam with matlab, but I can't change my webcam zoom in matlab m-file. I need it.
I used of : set(src_obj,'ZoomMode','manual');
src_obj.zoom = 145;

and I recieved this error:
??? Error using ==> imaqchild.set at 74
Invalid property: 'ZoomMode'.
Type 'imaqhelp' for information.

Error in ==> HandRead at 51
set(src_obj,'ZoomMode','manual');

could you plz help me?:!:
 

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