Alternative Techniques
A black rectangular or square box (known as censor bars) may be simply be used to occlude parts of images completely (for example, a black bar covering the eyes in lieu of the entire face being pixelized). Censor bars were extensively used as a graphic device in the January 2012 Protests against SOPA and PIPA.
A drawback of pixelization is that any differences between the large pixels can be exploited in moving images to reconstruct the original, unpixelized image; squinting at a pixelized, moving image can sometimes achieve a similar result. In both cases, integration of the large pixels over time allows smaller, more accurate pixels to be constructed in a still image result. Completely obscuring the censored area with pixels of a constant color or pixels of random colors escapes this drawback but can be more aesthetically jarring.
Read more about this topic: Pixelization
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