Abstract: The disclosure relates to an optical system for capturing information on the two-dimensional and/or three-dimensional distribution of wavefronts from a plurality of images, wherein the optical system comprises at least one sensor for capturing images, wherein the at least one sensor comprises a plurality of pixels and wherein at least some of the pixels comprise at least two photodiodes; at least one tunable optical element, wherein said at least one tunable optical element is adapted to vary the focus of the optical system; and wherein the optical system is configured for capturing a plurality of images with the at least one sensor at a plurality of focus positions set by the at least one tunable optical element.

Abstract: The disclosure relates to a method including: capturing a sequence of images of a scene with a camera at different focus positions according to a predetermined focus schedule that specifies a chronological sequence of focus positions of the camera, extracting image features of captured images, after having extracted and stored image features from said captured images, processing a captured image whose image features have not yet been extracted, said processing comprising extracting image features from the currently processed image and storing the extracted image features, said processing further comprising aligning image features stored from the previously captured images with the image features of the currently processed image, and generating a multi-dimensional tensor representing the image features of the processed images aligned to the image features of the currently processed image, and generating a two-dimensional depth map using the focus positions in the predetermined focus schedule and the generated