Enhancing Video Super-Resolution via Implicit Resampling-based Alignment

• URL: http://arxiv.org/abs/2305.00163v2
• Date: Thu, 18 Jan 2024 02:10:01 GMT
• Title: Enhancing Video Super-Resolution via Implicit Resampling-based Alignment
• Abstract summary: In super-resolution video, it is common to use a frame-wise alignment to support the propagation of information over time. We show that for alignment to be effective, the resampling should preserve the reference frequency spectrum while minimizing spatial distortions.
• Score: 44.27520685545412
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In video super-resolution, it is common to use a frame-wise alignment to support the propagation of information over time. The role of alignment is well-studied for low-level enhancement in video, but existing works overlook a critical step -- resampling. We show through extensive experiments that for alignment to be effective, the resampling should preserve the reference frequency spectrum while minimizing spatial distortions. However, most existing works simply use a default choice of bilinear interpolation for resampling even though bilinear interpolation has a smoothing effect and hinders super-resolution. From these observations, we propose an implicit resampling-based alignment. The sampling positions are encoded by a sinusoidal positional encoding, while the value is estimated with a coordinate network and a window-based cross-attention. We show that bilinear interpolation inherently attenuates high-frequency information while an MLP-based coordinate network can approximate more frequencies. Experiments on synthetic and real-world datasets show that alignment with our proposed implicit resampling enhances the performance of state-of-the-art frameworks with minimal impact on both compute and parameters.

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