p078fig02.30 Choosing the adaptation level to achieve informational noise suppression.<BR>||  Noise suppression. Attenuate Zero Spatial frequency patterns: no information.  Ii vs i (flat line), xi vs i (flat line at zero)<BR>B >> C: Try B = (n - 1)*C or C/(B + C) = 1/n<BR>Choose a uniform input pattern (no distinctive features):  All θi = 1/n<BR>xi = (B + C)*I/(A + I)*[θi -C/(B + C)] = 0 no matter how intense I is.