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arXiv 1911.02466cs.CV
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基于感知颜色距离的大而不可感知的对抗图像扰动

Towards Large yet Imperceptible Adversarial Image Perturbations with Perceptual Color Distance

Radboud University(拉德堡德大学)

Zhengyu Zhao, Zhuoran Liu, Martha Larson

摘要:

设计欺骗图像分类器的图像扰动的成功评估的对抗效果和视觉不可感知性。关于不可感知性的传统假设是,扰动应该争取RGB空间中的紧$L_p$范数界限。在这项工作中,我们放弃了这个假设,追求一种方法,利用人类的颜色感知,更具体地说,最小化扰动大小相对于感知颜色距离。我们的第一种方法,感知颜色距离C&W(PerC-C&W),扩展了广泛使用的C&W方法,并产生更大的RGB扰动。PerC-C&W能够保持对抗强度,同时有助于感知。我们的第二种方法,感知颜色距离交替损失(PerC-AL),实现了相同的结果,但这样做更有效地通过在更新扰动时在分类损失和感知色差之间交替。实验评估表明,PerC方法优于传统的$L_p$方法的鲁棒性和可转移性方面,还表明,PerC距离可以提供附加值的现有的基于结构的方法来创建图像扰动。

英文摘要:

The success of image perturbations that are designed to fool image classifier is assessed in terms of both adversarial effect and visual imperceptibility. The conventional assumption on imperceptibility is that perturbations should strive for tight $L_p$-norm bounds in RGB space. In this work, we drop this assumption by pursuing an approach that exploits human color perception, and more specifically, minimizing perturbation size with respect to perceptual color distance. Our first approach, Perceptual Color distance C&W (PerC-C&W), extends the widely-used C&W approach and produces larger RGB perturbations. PerC-C&W is able to maintain adversarial strength, while contributing to imperceptibility. Our second approach, Perceptual Color distance Alternating Loss (PerC-AL), achieves the same outcome, but does so more efficiently by alternating between the classification loss and perceptual color difference when updating perturbations. Experimental evaluation shows PerC approaches outperform conventional $L_p$ approaches in terms of robustness and transferability, and also demonstrates that the PerC distance can provide added value on top of existing structure-based methods to creating image perturbations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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