Method and apparatus for controlling overshoot in a video enhancement system
View Patent ↗A method for enhancing an edge transition in a video signal comprising the steps of receiving a video signal including an edge transition, generating a correction signal for the edge transition, applying the correction signal to the video signal to produce a corrected signal and restricting the amplitude of the corrected signal to extend between extended maximum and minimum amplitude limits in dependence on the measured maximum and minimum amplitudes of a predefined pattern of pixels adjacent to the edge transition.
1. A method for enhancing an edge transition in a video signal comprising the steps of:
receiving a video signal including an edge transition;
generating a correction signal for the edge transition;
applying the correction signal to the video signal to produce a corrected signal;
measuring maximum and minimum amplitudes of a cross-shaped window pattern of pixels adjacent to the edge transition; and
restricting the amplitude of the corrected signal to extend between extended maximum and minimum amplitude limits in dependence on the measured maximum and minimum amplitudes of the cross-shaped window pattern of pixels.
2. An apparatus for enhancing an edge transition in a video signal comprising:
means for receiving a video signal including an edge transition;
means for generating a correction signal for the edge transition;
means for applying the correction signal to the video signal to produce a corrected signal;
means for measuring the maximum and minimum amplitude of pixels in a cross-shaped window pattern adjacent to the edge transition;
means for calculating extended maximum and minimum amplitude limits in dependence on the measured maximum and minimum amplitudes; and,
means for restricting the amplitude of the corrected signal within the extended maximum and minimum amplitude limits.