accuracy about 94 but predicted images are hazy as if sand was sprinkled on the border of the image.

[RLADUDWN7237]

I trained this model for predicting boundaries on the x-ray image.
But it is hazy as if sand was sprinkled on the border of the image.
Anybody know the reason?
Do I have to change the structure of model?
or do I have to improve the quality of train data?

In my opinion, there are some problems on bright part of the image.

you can see the x_train, y_train data and predicted data by visiting the site below.
thank you.

https://blog.naver.com/72kyj37

[BlueGis]

Hello, have you found a solution?