US Patent 8134589 Zoom by multiple image capture

An image sensor assembly includes a fixed focal length optical lens; a mirror that reflects light from the scene to an optical lens and moves into a plurality of positions; and an image sensor that receives the light after it passes through the optical lens and captures a plurality of images that represents each image captured from each position of the mirror; wherein at least portions of the plurality of images are stitched together to form a composite image with a desired zoom factor.