When we acquiring the image from webcam whithin Matlab result depends from Exposition Time, Contrast, Gain etc, many aquisition parameters that control image properties. Webcams that I have tried (Logitech Webcam HD C310 and Philips SPC 900NC) have automatic mode for set of these parameters. It is good for common purposes, but it is not convenient if you like to compare different images.
I have try to control these parameters, but did not found how to communicate between Matlab and camera driver. Correspondence with webcam producer to obtain interface to camera driver (I have asked about corresponding DLL) gives no result as well.
If somebody knows the webcam models that allow such a control, please, give information about your positive experience.