Layered representations for image coding
Edward H. Adelson · 1991
Introduction In order to represent a television image sequence with a minimal number of bits, it is necessary to perform efficient image coding. Transform coding, subband coding, and vector quantization are examples of popular techniques that have been applied to the coding of still and moving images. In the case of moving image sequences, these techniques are often combined with frame-differencing or motion compensation, to take advantage of the temporal structure of image sequences. Any image coding technique contains an implicit vocabulary and image model; that is, it offers a way to describe images. For example, in a discrete cosine transform technique, an image is described as a sum of cosine basis functions, and this forms the implicit image model. If motion compensation is used for moving images, then the implicit image model includes the idea that regions of the image move coherently across time. There are three interrelated parts to the design of an image coding syste