A quadtree-based approach is described for representing colour images using variable spatial and colour resolution. This approach allows systematic refinement of images during reconstruction. Compression and noise results are presented for test images in several colour spaces.
Anthony J. Maeder, "Rapid Colour Image Reconstruction Using Colour Quadtress" in Proc. IS&T 3rd Color and Imaging Conf., 1995, pp 133 - 135, https://doi.org/10.2352/CIC.1995.3.1.art00035