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autogain. how to disable autogain and set a fixed value

I would like to know if there is a simple and cheap way to achieve this. I am requiring to control the gain (and exposure if possible)in a webcam using OpenCV.

Usually automatic gain(autogain) is set on in standard cheap web cameras (and analog video cameras too). For my project I need to control by software the gain/ exposure and any other property available in the camera. I am using OpenCV.

I would like: a recommendation for a cheap/flexible web usb camera that can be controlled with OpenCV. Any sugestion?