MSU NoiseGenerator VirtualDub plugin   
http://www.compression.ru

The filter adds artificial noise of one common types (equidistributed, normaldistributed, colour stains, echo signal) to video stream. It can be used for testing, debuging and comparison of various denoising filters. 'Settings' dialogue box allows to select type of noise to generation. Noise intensity can be specified for each colour component (the filter uses YCrCb colour space). Individual noise parameters also can be changed for some noise types.