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ACM Multimedia 2026 Challenge

GenText-Forensics: Challenge on Explainable Forensics and Adversarial Generation for Text-Centric Images

Rio de Janeiro, Brazil — 10–14 November 2026

Register on Codabench

Latest News

22 May 2026 Test Data Released & Evaluation Open! The test set is now available on HuggingFace . The evaluation pipeline is officially open — submit your predictions on Codabench .
22 May 2026 Evaluation Weights Updated! The final score formula has been refined: SFin = 0.3 × SDet + 0.4 × SLoc(mIoU) + 0.15 × SExp(BERTScore) + 0.15 × SRep. See the Challenge page for details.
20 Apr 2026 Training Data Released! The RealText-V2 training set is now available on HuggingFace , including forged and authentic images with pixel-level ground truth masks and expert annotations.
17 Apr 2026 Competition launched! Registration is now open on Codabench .
7 Mar 2026 Our GenText-Forensics Challenge proposal has been officially accepted by ACM Multimedia (ACM MM) 2026!

About the Challenge

The rapid advancement of AIGC has fundamentally lowered the barrier to digital content manipulation, shifting document tampering from "visible visual modifications" to a sophisticated fusion of visual forgery and semantic manipulation. In the AGI era, covert techniques—such as visually similar character substitution—not only evade traditional detection but also pose cascading poisoning risks across OCR–LLM pipelines. As global AI regulations tighten, simple binary authenticity judgments are no longer sufficient; there is an urgent need for explainable, reasoning-based forensic capabilities.

To address these critical security threats, we launch GenText-Forensics, the first AI security challenge dedicated to global multilingual text-image forensics. The challenge reframes document forgery detection as a unified generative "forgery analysis" task, aiming to bridge the gap in evidence traceability and reasoning insight by producing structured forensic reports.

Supported by RealText-V2, the world's first large-scale multilingual document forgery benchmark, this challenge provides a solid data foundation featuring:

Defense Track

Forgery Analysis Report Generation

  • Requiring the generation of comprehensive reports that integrate detection, spatial grounding, and natural language explanation.