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Edge-Informed Single Image Super-Resolution (arxiv.org)
2 points by sel1 on Sep 16, 2019 | hide | past | pdf | discuss on HN

In plain words: To blow up a small image, the system first draws its likely sharp edges, then fills in color and texture around them, treating the task like patching a damaged picture. This split produced cleaner results than simple stretching at 2x, 4x, and 8x enlargement.

Abstract

The recent increase in the extensive use of digital imaging technologies has brought with it a simultaneous demand for higher-resolution images. We develop a novel edge-informed approach to single image super-resolution (SISR). The SISR problem is reformulated as an image inpainting task. We use a two-stage inpainting model as a baseline for super-resolution and show its effectiveness for different scale factors (x2, x4, x8) compared to basic interpolation schemes. This model is trained using a joint optimization of image contents (texture and color) and structures (edges). Quantitative and qualitative comparisons are included and the proposed model is compared with current state-of-the-art techniques. We show that our method of decoupling structure and texture reconstruction improves the quality of the final reconstructed high-resolution image. Code and models available at: https://github.com/knazeri/edge-informed-sisr

Kamyar Nazeri, Harrish Thasarathan, Mehran Ebrahimi
arXiv:1909.05305 · eess.IV, cs.CV · submitted Sep 11, 2019
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