A dual watermarking technique for images
Saraju P. Mohanty, K.R. Ramakrishnan, Mohan Kankanhalli · 1999
Digital watermarking is the technique in which a visible/invisible signal (watermark) is embedded in a multimedia document for copyright protection. In this paper, we propose a watermarking scheme called "dual watermarking". Dual watermark is a combination of a visible watermark and an invisible watermark.