Dual-Domain Fusion Convolutional Neural Network for Contrast Enhancement Forensics
This work addresses the need for more accurate and robust contrast enhancement forensics tools for the image forensics community, representing an incremental improvement over existing methods.
The paper tackles the problem of detecting contrast-enhanced images in forensics by proposing a dual-domain fusion convolutional neural network that combines pixel and histogram domain features, achieving better performance and robustness against pre-JPEG compression and anti-forensics attacks.
Contrast enhancement (CE) forensics techniques have always been of great interest for image forensics community, as they can be an effective tool for recovering image history and identifying tampered images. Although several CE forensic algorithms have been proposed, their accuracy and robustness against some kinds of processing are still unsatisfactory. In order to attenuate such deficiency, in this paper we propose a new framework based on dual-domain fusion convolutional neural network to fuse the features of pixel and histogram domains for CE forensics. Specifically, we first present a pixel-domain convolutional neural network (P-CNN) to automatically capture the patterns of contrast-enhanced images in the pixel domain. Then, we present a histogram-domain convolutional neural network (H-CNN) to extract the features in the histogram domain. The feature representations of pixel and histogram domains are fused and fed into two fully connected layers for the classification of contrast-enhanced images. Experimental results show that the proposed method achieve better performance and is robust against pre-JPEG compression and anti-forensics attacks. In addition, a strategy for performance improvement of CNN-based forensics is explored, which could provide guidance for the design of CNN-based forensics tools.