A Statistical and Iterative Method for Data Hiding in Palette-Based Images

Authors:
Semin Kim;Wesley Neve;Yong Man Ro
Affiliations:
Image and Video Systems Lab, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea 305-732;Image and Video Systems Lab, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea 305-732;Image and Video Systems Lab, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea 305-732
Venue:
IWDW '09 Proceedings of the 8th International Workshop on Digital Watermarking
Year:
2009

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Abstract

This paper proposes an improved iterative method for data hiding in palette-based images, taking into account the statistics of the data that need to be embedded in an image. In particular, the proposed method considers the distribution of the number of zeroes and ones in the input message, as well as how the message bits are distributed over the colors in the image palette. First, according to the statistics of the input message, the proposed method modifies the pixel indexes and the color palette using an enhanced version of an iterative image pre-processing method, replacing less frequent colors by colors that are close to frequently used colors. In a next step, the actual message bits are embedded into the parity bits of the remaining colors. Finally, the proposed method applies a post-processing step, adjusting particular colors in order to further reduce the amount of image distortion. Experimental results show that the proposed method preserves image quality better than previously proposed techniques for data hiding in palette-based images.