Recently I use image acquistion toolbox, the image captured is very gloomy, but the image in preview figure is clear bright.
% This is copyed from Image acquistion toolbox
vid = videoinput('winvideo', 1, 'I420_640x480'); src = getselectedsource(vid);
% Set video input object properties for this application.
set(vid,'TriggerRepeat',Inf); vid.FrameGrabInterval = 1;
% Set value of a video source object property.
vid_src = getselectedsource(vid); set(vid_src,'Tag','motion detection setup'); preview(vid);% Create a figure window.
figure;
% Start acquiring frames.
start(vid)
% display it.
while(vid.FramesAcquired<=100) % Stop after 100 frames
frame = getsnapshot(vid); imshow(frame); %%This is used to show the snapshot, very gloomy
end stop(vid) closepreview(vid)
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