Erasing the JPEG Compression Artifacts: An Improved Counter-Forensic Algorithm Based on Parameter Adjustment

With the growing awareness of the fraud case for digital images, the researchers have developed some forensic techniques that based on the intrinsic statistical history or trace left by the JPEG compression to determine an image´s manipulation. In this letter, we present an improved counter-forensic scheme that based on parameter adjustment. The simulation shows that by using the proposed strategy and combined with the chaotic theory, the scheme can erase the quantization artifacts perfectly, especially when the compression factor Q = 50, the improved algorithm can achieve a better counter-forensic result than the original method.