an implementation of Viresh Ratnakar and Miron Livny ' s algorithm in the paper <RD-OPT: An Efficient Algorithm For Optimizing DCT Quantization Tables>
Ratnakar, Viresh, and Miron Livny. "RD-OPT: An efficient algorithm for optimizing DCT quantization tables." Data Compression Conference, 1995. DCC'95. Proceedings. IEEE, 1995.