Patent ID: 7298404

Claim:
An edge enhancing apparatus comprising: a filter for extracting a horizontal high-frequency component from a video signal; a signal level detecting means for discriminating between positive and negative of signal levels of the high frequency component detected by the filter; a rise and fall detecting means for discriminating between leading and trailing edges of the video signal; an enhancement signal generating means for generating an enhancement signal by multiplying the high frequency component extracted by the filter by a gain; and an adding means for adding the enhancement signal to the video signal; the enhancement signal generating means makes the gain larger than a predetermined value when the signal level of the high frequency component at the leading edge of the video signal is positive while making the gain equal to or smaller than the predetermined value when the signal level of the high frequency component at the leading edge of the video signal is negative; makes the gain equal to or smaller than the predetermined value when the signal level of the high frequency component at the trailing edge of the video signal is positive while making the gain larger than a predetermined value when the signal level of the high frequency component at the trailing edge of the video signal is negative.