Maurice Maes Ton Kalker Jaap Haitsma Geert Depovere Exploiting Shift Invariance to Obtain a High Payload in Digital Image Watermarking. 7-12 1999 ICMCS, Vol. 1 http://computer.org/conferen/proceed/icmcs/0253/Volume%201/02539007abs.htm db/conf/icmcs/icmcs99-1.html#MaesKHD99