Motion-Aware Reinforcement Learning For Object Localization

• URL: http://arxiv.org/abs/2606.21764v1
• Date: Fri, 19 Jun 2026 21:27:02 GMT
• Title: Motion-Aware Reinforcement Learning For Object Localization
• Abstract summary: We present MARLNet, a PPO-based bounding-box refinement agent that incorporates a constant-velocity motion prior into the observation state.<n>The agent operates on 268-dimensional observations and learns a five-dimensional policy controlling coordinate adjustments and a binary termination trigger.<n>We analyze a reward interference in which combining a constant-velocity deviation penalty with an absolute IoU term causes trigger collapse.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present MARLNet (Motion-Aware Reinforcement Learning Network), a PPO-based bounding-box refinement agent that incorporates a constant-velocity motion prior into the observation state and an action smoothness penalty into the reward function. The agent operates on 268-dimensional observations encoding the current proposal, a kinematic prediction, the previous action, and a 256-dimensional EfficientNet-B0 crop feature, and learns a five-dimensional policy controlling coordinate adjustments and a binary termination trigger. Evaluated on Pascal VOC 2012 and VisDrone 2019, MARLNet trains stably across all regularization strengths tested and achieves consistent gains in detection success rate at $\text{IoU} \geq 0.5$: up to $+0.011$ on VOC ($λ_\text{phys}{=}0.10$), where the motion prior prevents the overshooting that causes plain PPO to regress on this metric, and $+0.007$ on VisDrone ($λ_\text{phys}{=}0.70$), where unconstrained PPO achieves a larger gain ($+0.025$) owing to the weaker base detector. Through reward design ablations and training dynamics analysis, we identify a reward interference in which combining a constant-velocity deviation penalty with an absolute IoU term causes trigger collapse, and show that replacing it with the action smoothness penalty resolves this failure. We further characterize a representational ceiling facing crop-feature refinement agents that share a backbone with their base detector, confirmed through a global-plus-local observation ablation. Project page: https://prithviraj97.github.io/marl-net

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