The test result show artfacts

[shliang0603]

@cszn
I test the testsets/BSD68 dataset, but my test results show artfacts. Can you give me some advice.Here are my test results.

[cszn]

You should use the default parameter settings.

[shliang0603]

@cszn I used the default parameter settings. I haven't changed any parameters

[shliang0603]

@cszn I used demo_test_dpsr_real.py test myself images， but it didn't achieve the effect of deblurring. Result is as fallow:
test image test_09.png :

result images test_09_x4.png: