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Here a simple answer to this:

1. first of all you should extract sharp edges. Like if you use Canny for edge detection set the thresholds somehow to that is responsive to sharp edges.
2. Then you could simply use a smoothing filter(e.g Gaussian) where a sharp edges where detected.

Here a simple answer to this:this but not an exact one:

1. first of all you should extract sharp edges. Like if you use Canny for edge detection set the thresholds somehow to that is responsive to sharp edges.
2. Then you could simply use a smoothing filter(e.g Gaussian) where a sharp edges where detected.