Disguise Visor uses a projector mounted at the edge of the visor on any large brimmed hat to project an image over the face of the wearer.
The projector can be powered by sunlight using a condenser, a slide of the image, and mirrors and lenses to create the image.
Alternately the projector can be electronic using a lightbulb and a slide of the image, or be completely digital using computer software and whatever components are in contemporary projectors.-- rcarty, Feb 16 2013random, halfbakery