Kazuhiro Oka Kineo Matsui A signature method for image data using partial scrambling with the generalized Peano scan. 20-29 2000 31 Systems and Computers in Japan 1 http://dx.doi.org/10.1002/(SICI)1520-684X(200001)31:1<20::AID-SCJ3>3.0.CO;2-D db/journals/scjapan/scjapan31.html#OkaM00