1. An imaging system, comprising: a camera lens for collecting an incoming light beam to thereby output an image-forming light beam; a plurality of beam splitters each comprising optical components that split a light beam into two or more beams, wherein one of the beam splitters is configured to receive the image-forming light beam; a plurality of color image sensors each arranged to receive a split light beam from one of the beam splitters, the color image sensors being configured to individually sense a scene with different focus to yield a plurality of captured images; a plurality of multiple-DOF (degree of freedom) actuators each connecting to an individual color image sensor for translating and rotating the individual color image sensor with respect to the beam splitter that the individual color image sensor is arranged to receive the split light beam from; and a computational unit comprising one or more processors and one or more memory units; wherein the computational unit is configured to: compute a geometric transformation among the images captured by the color image sensors so as to configure the multiple-DOF actuators to align the color image sensors; and to perform luminance unification on the captured images so as to output a resultant image; such that the resultant image after alignment and luminance unification is a high resolution image of the scene with pixel-to-pixel registration.