According to one embodiment, a video processing device includes a test pattern controller configured to output a test pattern to a display capable of displaying stereoscopically. The test pattern is indicative of whether a viewer is substantially at a center of a viewing area in which a video is viewed stereoscopically. The test pattern includes first to sixth parallax images corresponding to respective first to sixth viewing points arranged in a horizontal direction. The third parallax image and the fourth parallax image include a first mark The first parallax image and the sixth parallax image include a second mark different from the first mark. The second parallax image and the fifth parallax image include neither the first mark nor second mark.