Progressive quantized projection watermarking scheme

Abstract

In this paper we present a new watermarking technique for digital images. Our approach modifies blocks of the image after projecting them onto certain directions. By quantizing the projected blocks to even and odd values we can represent the hidden information properly. The proposed algorithm does the modification progressively to ensure successful data extraction without any prior information being sent to the receiver side. In order to increase the robustness of our watermark to scaling and rotation attacks we also present a solution to recover the original size and orientation based on a training sequence which is inserted as part of the watermark.