which downsampling method do you use to generate the LR image from the testing image?

[DanChen001]

Hi, thank you for sharing the code.

which downsampling method do you use to generate the LR image from the testing image?

[assafshocher]

We have several separate cases.
It is important that the downscaling method will be the correct one (= approximately the one by which the test image was downscaled from the theoretic ground-truth image [that may not exist]).
For the ideal case (= we have prior knowledge that the correct downscaling is bicubic), we just use bicubic downscaling.
For the non-ideal case we use a given input-kernel.
(for unknown kernel we need to first estimate the kernel, for example using our method KernelGAN: https://github.com/sefibk/KernelGAN).

An example for test-data generation for blind SR can be found here: https://github.com/assafshocher/BlindSR_dataset_generator

It depend whether you want to original data used