Disclosed in an image processing unit for generating, based on a plurality of input images, a first output image and a second output image, to be displayed on a stereoscopic display device, wherein a stereoscopic image and a monoscopic image can be displayed. The image processing unit including an offset calculator designed to calculate an offset image based on a first one of the input images, an addition unit designed to calculate the first output image by adding the offset image with a second one of the input images and a subtraction unit designed to calculate the second output image by subtracting the offset image from the second one of the input images.