There is electronic "ringing" that originates from such things as poorly impedance-matched components and sharpness control overuse, but the so-called "edge enhancement" is usually applied during the digital video "authoring" transferring process (for what is worth, I do not believe EE exists in HD anomorphic masters). Once the EE is applied to the video signal by the authoring technician or telecine operator, there is little or next to nothing that we can do to mitigate or eliminate such pesky, odious artifact.
I agree with Jeroen: edge enhancement destroys the illusion of viewing video-originated images in cinema-like settings. EE should never be used neither as a crutch nor as an alternative to poor QC or whatever the reasons for its use. The DVD format doesn't need it!!... http://www.avsforum.com/ubb/mad.gif