Well, in this case, enriquito&#x27;s intuition is correct.  The algorithm is very similar (if not identical[0]) to the algorithm found in the simplest edge-detection filter, which is to do isolate medium-band frequency contributions in phase space.<p><a href="https:&#x2F;&#x2F;github.com&#x2F;JalaliLabUCLA&#x2F;Image-feature-detection-using-Phase-Stretch-Transform&#x2F;blob&#x2F;master&#x2F;PST.m" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;JalaliLabUCLA&#x2F;Image-feature-detection-usi...</a><p>[0] I would be surprised if no one has ever used this exact arctangent kernel (with maybe different normalization and parametrization) in phase space.