how to implement automatic gain control

From: "sergej.jurecko@xxxxxxxxx" <sergej.jurecko@xxxxxxxxx>
Date: 9 Oct 2006 09:31:07 -0700

Can anyone help me with some sources (links, books) about how to
implement automatic gain control for a webcam?
Just turning it on/off via DirectShow is not an option, because it does
not seem to work properly. So I have no choise but to implement it
myself.

.

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