Article

Benchmark Collapse in Text CAPTCHAs: Generator Heterogeneity, Cross-Generator Transfer, and Reliability-Aware Synthetic Evaluation

2026-06-08

Abstract excerpt

<title>Abstract</title> <p>Text-based CAPTCHAs remain widely studied, but published results often depend as much on the benchmark generator as on the recognition model. We examine this problem under controlled synthetic conditions and make four contributions. First, we identify and correct a defect in a CAPTCHA generation pipeline whose advertised difficulty control introduced visual artifacts unrelated to true d...

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Literature Corpus work: cd05bc55-7480-537d-8a8f-176b792b26cb
DOI: 10.21203/rs.3.rs-9558596/v1

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