Title:
【発明の名称】ポストフィルタ
Document Type and Number:
Japanese Patent JP2761077
Kind Code:
B2
Abstract:
PURPOSE:To eliminate noise component from a picture signal and to enhance the degree of the filter by using a frame memory to allow a decoded picture signal to pass through a 2-dimensional LPF for plural number of times and making the number of times of passing adaptive timewise and specemise. CONSTITUTION:A picture signal inputted from an input terminal 1 is outputted to a signal terminal 5 as a decoded picture signal via a coder 2 and a decoder 4. The picture signal is inputted to a selection circuit 84 of a filter block (LPF) 6. A circuit 84 selects an input picture signal from a memory 83 under the control of a filter input selection signal 86 outputted from a control circuit 82, the output is inputted to a selection circuit 68 via a succeeding linear LPF and inputted to a selection circuit 69 via a next stage LPF. The circuits 68, 69 compare the signal with a signal not subject to filter processing and select the signal subject to filter processing when the absolute value of the difference is within a prescribed threshold level T, and select the signal not subject to filter processing when the value exceeds the level T, and output the selected signal.
Inventors:
SUZUKI YUTAKA
KATO YOICHI
KATO YOICHI
Application Number:
JP7542690A
Publication Date:
June 04, 1998
Filing Date:
March 27, 1990
Export Citation:
Assignee:
NIPPON DENSHIN DENWA KK
International Classes:
H04N5/21; H03H17/02; H03H21/00; H04N1/40; H04N1/409; H04N1/41; H04N19/00; H04N19/102; H04N19/117; H04N19/136; H04N19/137; H04N19/14; H04N19/172; H04N19/176; H04N19/182; H04N19/196; H04N19/42; H04N19/423; H04N19/80; H04N19/85; H04N19/86; (IPC1-7): H04N5/21; H03H17/02; H03H21/00; H04N1/41; H04N7/24
Attorney, Agent or Firm:
Takashi Sawai