Title:
MOTION DETECTION CIRCUIT
Document Type and Number:
Japanese Patent JP3425320
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce a failure in a display image by image by extracting a difference component between frames from a video signal, applying band limit to the difference component in a horizontal direction, comparing the inter-frame difference signal subjected to band limit with a prescribed setting value so as to discriminate a motion and to control a characteristic of a filter depending on the pattern of the video signal thereby detecting the motion accurately without malfunction.
SOLUTION: An inter-frame difference signal outputted from an inter-frame motion detection circuit 15c is fed to an absolute value circuit 15e via a horizontal low pass filter(LPF) 15i in place of a horizontal LPF 15d. The frequency characteristic of the horizontal LPF 15i is varied up to a through-state, that is, an input signal is outputted without any modification. The horizontal LPF 15i detects pattern of a composite video signal fed to an input terminal 15a. As a result, the frequency characteristic is controlled. A pattern detection circuit 22 controls the frequency characteristic of the horizontal LPF 15i to be in a through-state as the simplest method.
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Inventors:
Yasuo Takahashi
Takashi Suzuki
Takashi Suzuki
Application Number:
JP3503097A
Publication Date:
July 14, 2003
Filing Date:
February 19, 1997
Export Citation:
Assignee:
Toshiba Corporation
Toshiba A.V.E. Co., Ltd.
Toshiba A.V.E. Co., Ltd.
International Classes:
H04N9/78; (IPC1-7): H04N9/78
Domestic Patent References:
| JP6327030A | ||||
| JP3127591A | ||||
| JP8149503A |
Attorney, Agent or Firm:
Takehiko Suzue (6 outside)