论文标题

通过空间相关检测重新上色的图像

Detecting Recolored Image by Spatial Correlation

论文作者

Zhang, Yushu, Chen, Nuo, Qi, Shuren, Xue, Mingfu, Cao, Xiaochun

论文摘要

旨在确保图像的真实性的图像取证在处理常见的图像操纵(例如复制移动,拼接和涂料)方面取得了长足的进步。但是,只有少数研究人员会注意一种称为图像重新上色的新兴编辑技术,该技术可以操纵图像的颜色值,从而使其具有新的样式。为了防止其恶意使用,先前的方法从渠道间相关性和照明一致性的角度解决了传统的重新着色。在本文中,我们尝试从空间相关的角度探索解决方案,该解决方案具有常规和基于深度学习的重新上色的通用检测能力。通过理论和数值分析,我们发现重新着色的操作将不可避免地破坏像素之间的空间相关性,这意味着统计上的新事先可区分性。基于这样的事实,我们生成了一组空间相关特征,并通过卷积神经网络从集合中学习信息表示。为了培训我们的网络,我们使用三种重新着色方法来生成大规模和高质量的数据集。在两个重塑场景中的广泛实验结果表明,空间相关特征具有很高的歧视性。我们的方法在多个基准数据集上实现了最先进的检测准确性,并在未知类型的重新上色方法上表现出很好的概括。

Image forensics, aiming to ensure the authenticity of the image, has made great progress in dealing with common image manipulation such as copy-move, splicing, and inpainting in the past decades. However, only a few researchers pay attention to an emerging editing technique called image recoloring, which can manipulate the color values of an image to give it a new style. To prevent it from being used maliciously, the previous approaches address the conventional recoloring from the perspective of inter-channel correlation and illumination consistency. In this paper, we try to explore a solution from the perspective of the spatial correlation, which exhibits the generic detection capability for both conventional and deep learning-based recoloring. Through theoretical and numerical analysis, we find that the recoloring operation will inevitably destroy the spatial correlation between pixels, implying a new prior of statistical discriminability. Based on such fact, we generate a set of spatial correlation features and learn the informative representation from the set via a convolutional neural network. To train our network, we use three recoloring methods to generate a large-scale and high-quality data set. Extensive experimental results in two recoloring scenes demonstrate that the spatial correlation features are highly discriminative. Our method achieves the state-of-the-art detection accuracy on multiple benchmark datasets and exhibits well generalization for unknown types of recoloring methods.

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