Patent ID: 7210786

Claim:
A projection display device comprising: an image processing means for processing input image data to generate a display image; a projection lens for projecting the display image processed by said image processing means onto a screen to make an enlarged presentation of a video picture; a test-pattern projection means for projecting a test pattern on said screen through said projection lens; an imaging means provided with an imaging element for shooting the projected video picture and a photograph lens; a shot-image analysis means for analyzing a shot image generated by said imaging means and also for detecting an obstacle within a region of said projected video picture; an image mask generation means for generating an image mask that corresponds to the detected obstacle; and a luminance control means for controlling luminance corresponding to said image mask; wherein said image mask generation means is provided with an image-mask enlargement-processing means for generating an image mask section that has a larger region than the region corresponding to the detected obstacle.