Television – Image signal processing circuitry specific to television – Motion dependent key signal generation or scene change...
Patent
1992-05-14
1994-12-27
Chin, Tommy P.
Television
Image signal processing circuitry specific to television
Motion dependent key signal generation or scene change...
348665, H04N 713, H04N 514
Patent
active
053769724
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a video signal transmission/reception system based on interlace scanning and, more particularly to a system in which a motion detection necessary for processing a received signal is carried out on the reception side.
2. Background Art
In recent television receivers, when a received video signal is processed, a motion detection for detecting whether a picture is a still image or real moving image is carried out and then a proper signal processing is carried out on the basis of a resultant motion detected information. When a composite video signal, for example, is separated into a luminance signal and color difference signals, the separation processing is carried out at respective frequency bands by utilizing only the video signals within the same frame if a picture is a real moving image. If a picture is a still image, then video signals of adjacent frames are utilized and the separating processing is carried out by a comb filter, thereby optimum processing being carried out in response to the signal conditions.
However, a conventional motion detecting circuit is low in motion detection accuracy of picture. When a motion detection is carried out on the basis of a vertical correlation of pictures between adjacent fields, for example, there is then the disadvantage such that even the still image is erroneously detected as the real moving image at the portion in which no vertical correlation is present. For this reason, according to the prior art, a responsiveness is lowered by widening a motion detection range or a motion is identified by using also motion detection information provided by other methods. If the responsiveness is lowered as described above, then there is then the disadvantage such that a resolution of a processed video signal is lowered. Further, if a plurality of motion detection information is obtained, there is then the problem such that the arrangement of the motion detecting circuit becomes complex.
SUMMARY OF THE INVENTION
In view of the aforesaid aspects, the present invention is to provide a video signal transmission/reception system of a simplified configuration in which a motion detection can be carried out on the reception side reliably.
In order to solve the aforesaid problems, according to the video signal transmission/reception system of the present invention, video signals picked up by an image pickup unit according to the sequential scanning are limited in vertical frequency band by low-pass filters, the video signals thus limited are converted into an interlace scanning video signal by a converting circuit, a signal of a predetermined vertical frequency band is extracted from the received video signal by a high-pass filter on the reception side of the video signal thus transmitted and a motion of the video signal is detected on the basis of the thus extracted signal.
Thus, a motion detection of high accuracy can be carried out by the simple arrangement in which the video signal of the predetermined vertical frequency band is only identified on the reception side
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1. is a block diagram showing a transmission side according to an embodiment of the present invention, FIG. 2 is a block diagram of a filter utilized on the transmission side according to the embodiment of the present invention, FIG. 3 is a block diagram showing a reception side according to the embodiment of the present invention, FIG. 4 is a block diagram of a filter utilized on the reception side according to the embodiment of the present invention, FIGS. 5, 6, 7 and 8 are respectively frequency characteristic diagrams used to explain the embodiment of the present invention, and FIGS. 9A-9E, 10A-10E, and 11A-11E are respectively diagrams used to explain the embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the video signal transmission/reception system according to the present invention will hereinafter be described with reference to the accompanying dr
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Matsunaga Osamu
Tanaka Yutaka
Chin Tommy P.
Frommer William S.
Sinderbrand Alvin
Sony Corporation
Tung Bryan S.
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