different images ◦ Threshold is a function of average gradient value and standard deviation of gradient value ◦ Threshold= mean + factor*std. deviation
those maximas which are above the threshold. •Two matrices ◦ LM_H = (Mag_q > Mag_r or q = r) and (Mag_q > Mag_p or q = p) ◦ LM_L = LM_H | Mag_q > thresh_mag