1. A camera system comprising: at least three lens units; at least three color filter units, each color filter unit being assigned to one of the at least three lens units and including a plurality of color filter sections; and at least three pixel units, each pixel unit being assigned to one of the lens units and including a plurality of pixel sensors arranged in a matrix, wherein the color filter sections have at least three different filter colors and each color filter unit is single-colored, and the at least three pixel units capture original monochromatic low-resolution images of a same scene or object that are pixel shifted versions imaged from deviating positions with respect to each other, and that are to be fused to form a polychromatic high-resolution image, each of the original monochromatic low-resolution images including a lower number of pixel values than a number of the pixel sensors that are available in the pixel units.