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arXiv · 2604.06938

POS-ISP: Pipeline Optimization at the Sequence Level for Task-aware ISP

Jiyun Won·Heemin Yang·Woohyeok Kim·Jungseul Ok·Sunghyun Cho
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Abstract

Recent work has explored optimizing image signal processing (ISP) pipelines for various tasks by composing predefined modules and adapting them to task-specific objectives. However, jointly optimizing module sequences and parameters remains challenging. Existing approaches rely on neural architecture search (NAS) or step-wise reinforcement learning (RL), but NAS suffers from a training-inference mismatch, while step-wise RL leads to unstable training and high computational overhead due to stage-wise decision-making. We propose POS-ISP, a sequence-level RL framework that formulates modular ISP optimization as a global sequence prediction problem. Our method predicts the entire module sequence and its parameters in a single forward pass and optimizes the pipeline using a terminal task reward, eliminating the need for intermediate supervision and redundant executions. Experiments across multiple downstream tasks show that POS-ISP improves task performance while reducing computational cost, highlighting sequence-level optimization as a stable and efficient paradigm for task-aware ISP. The project page is available at https://w1jyun.github.io/POS-ISP

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Jiyun Won, Heemin Yang, Woohyeok Kim, Jungseul Ok, Sunghyun Cho. 2026-04-08. POS-ISP: Pipeline Optimization at the Sequence Level for Task-aware ISP. https://arxiv.org/abs/2604.06938

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