Patent ID: 7988304

Claim:
A portable video projector for projecting video, comprising: a projection optical system which projects video by short-wavelength laser light sources which emit laser lights as linear polarized lights of at least three colors including red, blue and green; a camera device which captures external light through said projection optical system; a camera shake detection unit which detects an amount of camera shake of the portable video projector while being held by a user; and a camera shake correction unit which corrects the camera shake according to the amount of camera shake detected by said camera shake detection unit, wherein said projection optical system projects the three-color laser lights without losses in their light amounts using prisms performing polarization, which are arranged such that respective axes thereof coincide with the polarizations of the three-color laser lights, and a part of the captured external light is incident on said camera device by the prisms performing polarization, and wherein said camera shake correction unit performs correction of the camera shake so that projecting positions of the laser lights of three colors including red, blue and green are not deviated when the video is projected, and said camera shake detection unit detects the camera shake amount by detecting movement of a video at four corners of an image that is captured by said camera device.