公开(公告)号：JP2756420B2

公开(公告)日：1998-05-25

申请号：JP3357595

申请日：1995-02-22

Applicant: ST MICROELECTRONICS SRL

Inventor： MANUSO MASSIMO ,  POLUZZI RINALDO ,  RIZZOTTO GIANGUIDO

IPC: H04N5/21 ,  G06T5/20 ,  H03H21/00 ,  H04N1/409

公开(公告)号：JPH0869526A

公开(公告)日：1996-03-12

申请号：JP3357595

申请日：1995-02-22

Applicant: ST MICROELECTRONICS SRL

Inventor： MANUSO MASSIMO ,  POLUZZI RINALDO ,  RIZZOTTO GIANGUIDO

IPC: H04N5/21 ,  G06T5/20 ,  H03H21/00 ,  H04N1/409

Abstract: PURPOSE: To obtain the inexpensive filter with a simple structure by which noise is reduced and an image ridge is emphasized. CONSTITUTION: The filter 1 is provided with an image ridge detection circuit 6 connected between outputs of the 1st and 2nd processing circuit means 2, 3 and with an image ridge emphasis circuit 7 connected between the output of the image ridge detection circuit and a noise reduction circuit 5 in addition to the 1st and 2nd processing circuit means 2, 3 receiving a digital image signal, a noise detection circuit 4, the noise reduction circuit 5 and an output of the image ridge emphasis circuit 7 is an output of the filter 1.