Y. Fisher, E. W. Jacobs, R. D. Boss. Fractal image compression using iterated transforms. Research Report Naval Ocean Systems Center, No 1408, 1991.
The theoretical framework for iterated transform image compression has been generalized to include noncontractive transforms. The method has been used to encode the 512 x 512 8-bpp image of "Lena" at a compression of 15.9:1 with the decode image having a root mean square error of 6.33 (32.1 dB). Other image have been encoded at various encoding conditions with the resulting compressions ranging from 10:1 to 63:1. It was shown that the relaxation of the contractivity constraint can lead to improvement in the fidelity of decoded images.
@TechReport{FiJaBo91,
Author = {Fisher, Y. and Jacobs, E. W. and Boss, R. D.},
Title = {Fractal image compression using iterated transforms},
Number = {1408},
Institution = {Naval Ocean Systems Center},
Address = {San Diego},
Year = {1991}
}