PROCEDE ET DISPOSITIF D'AMELIORATION DE LA NETTETE POUR LA REPRODUCTION D'IMAGES

PROCEDE ET DISPOSITIF D'AMELIORATION DE LA NETTETE POUR LA REPRODUCTION D'IMAGES.L'IMAGE D'ORIGINE EST EXPLOREE PHOTO-ELECTRIQUEMENT POUR OBTENIR UN SIGNAL PRINCIPAL ET UN SIGNAL FLOU. LE DISPOSITIF COMPREND:A.UN CIRCUIT A SIGNAL D'AMELIORATION DE NETTETE 11, 7, 9;B.UN CIRCUIT DE DETECTION DES COMPOSANTES D'AMELIORATION DE NETTETE 12, 13, 14;C.UN CIRCUIT COMPOSEUR 15 QUI AJOUTE LES COMPOSANTES D'AMELIORATION DE NETTETE DETECTEES AU SIGNAL PRINCIPAL DANS SES PARTIES CORRESPONDANTES. A sharpness emphasizing method and machine used in a picture reproducing machine such as a color separator, wherein a sharpness emphasizing signal is prepared from a main signal and an unsharp signal, which are obtained by scanning an original picture, in a sharpness emphasizing signal circuit, wherein a corrected sharpness emphasizing signal is selectively produced from the sharpness emphasizing signal depending on the leap of the unsharp signal in a sharpness emphasizing component pickup circuit, and wherein the corrected sharpness emphasizing signal is added to the main signal in a composer circuit, thereby obtaining a picture signal whose sharpness is emphasized in its detail portions.