I am not sure I post this in the right sub forum, but I'Il explain what I am looking for.
Recently I purchased a very nice projector. Due to my living room setup, I am limited in placing the projecter. Therefore, in order to get the picture on the screen, I have to use keystone correction. Not much, just ~5cm on each side on the top. However, when I use the keystone correction of the projector, the moire effect becomes visible in some scenes. The solution is to keep keystone correction turned of. I am using XBMC, which has a video calibration option. When I use this to fit the picture on the screen, on the bottom there is some space between in the picture and the black bars of the screen. This is visible in bright scenes.
What I am looking for is quitte simple. I need some sort of video overlay thing, that just projects an image on top of anything else. The picture will be some black bars on both sides of the screen in a [|/__\|] shape. This way I do not need the keystone correction of the projector and the picture perfectly fits on the screen.
Is it clear what I want? Do you guys have any ideas how I can accomplish this?