結合仕様による学習ベースキーポイント検出のロバスト性検証:分離から結合へ
From Decoupled to Coupled: Robustness Verification for Learning-based Keypoint Detection with Joint Specifications
キーポイント検出器のロバスト性を、全キーポイントの結合的なずれを考慮して検証する初のフレームワークを提案。MILPを用いて反例探索を行い、検証の健全性を保証する。
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著者: Xusheng Luo, Changliu Liu
分類: cs.CV, cs.LG, cs.RO
原文アブストラクト
Keypoint detection underpins many vision tasks, including pose estimation, viewpoint recovery, and 3D reconstruction, yet modern neural models remain vulnerable to small input perturbations. Despite its importance, formal robustness verification for keypoint detectors is largely unexplored due to high-dimensional inputs and continuous coordinate outputs. We propose the first coupled robustness verification framework for heatmap-based keypoint detectors that bounds the joint deviation across all keypoints, capturing their interdependencies and downstream task requirements. Unlike prior decoupled, classification-style approaches that verify each keypoint independently and yield conservative guarantees, our method verifies collective behavior. We formulate verification as a falsification problem using a mixed-integer linear program (MILP) that combines reachable heatmap sets with a polytope encoding joint deviation constraints. Infeasibility certifies robustness, while feasibility provides counterexamples, and we prove the method is sound: if it certifies the model as robust, then the keypoint detection model is guaranteed to be robust. Experiments show that our coupled approach achieves high verified rates and remains effective under strict error thresholds where decoupled methods fail.
