US Patent 7973838 Active mask for electronic imaging system

An active pixel masking system for automatic glare suppression uses a variably transmissive screen such as an LCD in front of a lens. A measurement by an image sensor of oversaturated pixels from one or more extremely bright lights is used to generate corresponding opaque pixels in the variably transmissive screen, thereby preventing the excess light from entering the lens, and thereby clarifying the appearance of any objects near to the bright light. A continuous reading of a motion picture image is used to move the location and area of the opaque pixels in response to the motion and area of the light.