Bird-SR outperforms prior super-resolution methods on real images by guiding diffusion trajectories with bidirectional rewards, early structure optimization on synthetic pairs, and later perceptual rewards with dynamic balancing.
DP²o-SR: Direct perceptual preference optimization for real- world image super-resolution
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Bird-SR: Bidirectional Reward-Guided Diffusion for Real-World Image Super-Resolution
Bird-SR outperforms prior super-resolution methods on real images by guiding diffusion trajectories with bidirectional rewards, early structure optimization on synthetic pairs, and later perceptual rewards with dynamic balancing.