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reference to the PIRM18-SR Chanllenge report
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QA.md
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QA.md
@ -6,6 +6,8 @@ First, the released ESRGAN model in the GitHub (`RRDB_ESRGAN_x4.pth`) is **diffe
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We found that the lower perceptual index does not always guarantee a better visual quality.
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The aims for the competition and our ESRGAN work will be a bit different.
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We think the aim for the competition is the lower perceptual index and the aim for our ESRGAN work is the better visual quality.
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> More analyses can be found in Sec 4.1 and Sec 5 in [PIRM18-SR Chanllenge report](https://arxiv.org/pdf/1809.07517.pdf).
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> It points out that PI (perceptual index) is well correlated with the human-opinion-scores on a coarse scale, but it is not always well-correlated with these scores on a finer scale. This highlights the urgent need for better perceptual quality metrics.)
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Therefore, in the PIRM18-SR Challenge competition, we used several tricks for the best perceptual index (see Section 4.5 in the [paper](https://arxiv.org/abs/1809.00219)).
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