First-Place Solution to NeurIPS 2024 Invisible Watermark Removal Challenge

• URL: http://arxiv.org/abs/2508.21072v1
• Date: Thu, 28 Aug 2025 17:59:59 GMT
• Title: First-Place Solution to NeurIPS 2024 Invisible Watermark Removal Challenge
• Authors: Fahad Shamshad, Tameem Bakr, Yahia Shaaban, Noor Hussein, Karthik Nandakumar, Nils Lukas,
• Abstract summary: It is unclear whether existing watermarks are robust against adversarial attacks.<n>We present the winning solution to the NeurIPS 2024 Erasing the Invisible challenge.<n>Our method successfully achieves near-perfect watermark removal with negligible impact on the residual image's quality.
• Score: 30.54990467530602
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Content watermarking is an important tool for the authentication and copyright protection of digital media. However, it is unclear whether existing watermarks are robust against adversarial attacks. We present the winning solution to the NeurIPS 2024 Erasing the Invisible challenge, which stress-tests watermark robustness under varying degrees of adversary knowledge. The challenge consisted of two tracks: a black-box and beige-box track, depending on whether the adversary knows which watermarking method was used by the provider. For the beige-box track, we leverage an adaptive VAE-based evasion attack, with a test-time optimization and color-contrast restoration in CIELAB space to preserve the image's quality. For the black-box track, we first cluster images based on their artifacts in the spatial or frequency-domain. Then, we apply image-to-image diffusion models with controlled noise injection and semantic priors from ChatGPT-generated captions to each cluster with optimized parameter settings. Empirical evaluations demonstrate that our method successfully achieves near-perfect watermark removal (95.7%) with negligible impact on the residual image's quality. We hope that our attacks inspire the development of more robust image watermarking methods.

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