Reality Transform Adversarial Generators for Image Splicing Forgery Detection and Localization
When many forged images become more and more realistic with the help of image editing tools and deep learning techniques, authenticators need to improve their ability to verify these forged images. The process of generating and detecting forged images is thus similar to the principle of Generative Adversarial Networks (GANs). Creating realistic forged images requires a retouching process to suppress tampering artifacts and keep structural information. We view this retouching process as image style transfer and then proposed the fake-to-realistic transformation generator GT. For detecting the tampered regions, a forgery localization generator GM is proposed based on a multi-decoder-single-task strategy. By adversarial training two generators, the proposed alpha-learnable whitening and coloring transformation (alpha-learnable WCT) block in GT automatically suppresses the tampering artifacts in the forged images. Meanwhile, the detection and localization abilities of GM will be improved by learning the forged images retouched by GT. The experimental results demonstrate that the proposed two generators in GAN can simulate confrontation between fakers and authenticators well. The localization generator GM outperforms the state-of-the-art methods in splicing forgery detection and localization on four public datasets.