An Attempt to Generalize Distortion Measure for JPEG Steganography

摘要

In this paper, we present several methods to improve performance of the existing data hiding method for JPEG steganography. Recent JPEG steganographic methods usually exploit minimum distortion strategy, where each DCT coefficients has predefined distortion value. Such strategy uses the best solution for data hiding with minimum cumulative distortion. Steganographic methods based on hiding data using the best solution with minimum distortion have better chance to pass powerful steganalysis presented in literature. Thus, the key point for such methods is a way to compute distortion for each DCT coefficient. In this paper, we present three different ways to compute distortion and search for parameters, where proposed functions show the best results. BCH-based method has been used as a tool for data hiding. Experimental results show that the presented distortion functions with the best parameters show better results compared to traditional approaches.