Patent ID: 6278494
Filing Date: 2001-08-21
Classification: H04N

Abstract:
An edge emphasis device which comprises first delay means for delaying an input signal a predetermined time, second delay means for further delaying an output signal from said first delay means a predetermined time, and second derivative signal generation means for outputting a second derivative signal of the input signal on the basis of the input signal and the output signals from said first and second delay means, comprising:edge-emphasizing signal generation means for generating an edge-emphasizing signal by assigning a sign of the second derivative signal to a minimum absolute value of a difference between the input signal and the output signal from said first delay means, a difference between the output signals from said first and second delay means, and the second derivative signal; anddelay addition means for outputting a signal obtained by emphasizing an edge of the input signal by adding the input signal and a corresponding edge-emphasizing signal in correspondence with each other.