Television – Special applications – Observation of or from a specific location
Reexamination Certificate
1998-05-04
2001-05-15
Britton, Howard (Department: 2613)
Television
Special applications
Observation of or from a specific location
C348S156000
Reexamination Certificate
active
06233006
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a video signal and an image change detecting machine of a video displayer, and more particularly, an image change detecting machine for easily monitoring a moving subject via the image change by using character generator and a method thereby.
DESCRIPTION OF THE RELATED ART
Generally, television system has two kinds, that is, closed circuit system and open circuit system. CCTV is closed circuit system and sends visual information to specific viewers for a specific purpose. Normally, it is used in the finance-related security system such as bank, subway system, traffic condition monitoring system, etc. The conventional CCTV comprises video camera
1
, signal transferring part
2
, monitor
3
, storing part
4
, and main controlling part
5
, as shown in FIG.
1
.
The video camera
1
takes a photograph at a specific area for monitoring and outputs the taken video signals to the signal transferring part
2
. The signal transferring part
2
transfers the video signal received from the video camera
1
to the signal capable of being output to the monitor
3
, and outputs the signals to the monitor
3
. The monitor
3
displays the video signal applied from the signal transferring part
2
for the supervisor who watches the specific area. The storing part
4
stores the taken photographs for later displaying. Because the camera
1
is always in taking a photograph or takes a photograph at a certain area for any time interval, the recording is long and it takes lots of tapes. The main controlling part
5
controls the whole operation of the CCTV system. When monitoring a specific area by using the CCTV system as described above, in other words, supervising a bank out of business hour, an alarm was equipped with the CCTV system such that the supervisor doesn't have to keep watching the monitor
3
. Synchronous signal was separated from the video signal of the video camera. Then, it was transferred to PWM (Pulse Width Modulation). The image change in the specific area was detected by using the transferred signal, which is analog method. Or, by digital method, the video signal from the video camera
1
is transferred to A/D (Analog/Digital) for the detection of the image change for the determined area.
As described above, in the analog method, the image change detecting machine of the conventional CCTV needs a separate system structure because of signal treatment by the variation of the vertical and the horizontal synchronous signal pulse, and as a result, the control and the installation are complicated. Further, the portion indicating the monitored area is not uniform at moving because of the vertical and the horizontal frequency properties. In addition, malfunctioning sometimes occurs with respect to the level characteristics of video output of the video camera. On the contrary, the digital method makes up for the disadvantages of the analog method but the construction of the circuits is very complicated and requires a separate ASIC (Application Specific Integrated Circuit) so that high expenses for development and prices for the system are increased.
THE SUMMARY OF THE INVENTION
The present invention is directed to provide an image change detecting machine and a method by using a character generator, which substantially obviates one or more of the problems due to the limitation and the disadvantages of the related art.
One object of the present invention is to provide an image change detecting machine and a method for detecting the image change for a specific area, providing easy-controlling for the monitoring system with minimum hardware configuration, and taking photographs in case of the image change for the monitored area when VCR recording so that long time recording is possible and the reliability for the supervising is improved.
To achieve these and other objects and in accordance with the purpose of the present invention, as embodied and broadly described, the image change detecting machine comprises: a video camera for taking a photograph and outputting the video signal for it; a synchronous signal separating part for separating and outputting the video signal from the video camera into a vertical synchronous signal and a horizontal synchronous signal; a monitor for displaying the video signal from the video camera; a character generator for outputting letter signal the synchronousness of which matches with that of the video signal received from the video camera based on the synchronous signal applied from the synchronous signal separating part; an analog switches for overlapping the video signal from the video camera and the letter signal from the character generator and outputting it to the monitor, and detecting the change of the video signal at where the frequency of the video signal from the video camera and the frequency of the letter signal from the character generator match each other and outputting the detecting signal corresponding to this; a comparator for comparing the detecting signal from the analog switches with the standard signal and outputting the control signal corresponding to this; a main controlling part for determining the letter signal output from the character generator and controlling its location, and outputting the alarm signal in accordance with the control signal from the comparator; a buffer for stabilizing the control signal from the comparator and applying it to the main controlling part; and an alarm generating part for generating or cutting off alarm in accordance with the alarm signal from the main controlling part.
A method of detecting image change by using character generator comprises the steps of: a) determining the initial image from the picture applied from a video camera and displaying it on the monitor; b) determining the area to be supervised for the image change on the initial picture displayed on the monitor after the a) step; c) storing the initial character generator data corresponding to the determined supervised area after the b) step; d) inputting the picture from the video camera and displaying it on the monitor after the c) step; e) comparing the video data corresponding to the detected area on the video data being input at present after the d) step, and the initial character generator data corresponding to the detected area stored on the c) step; f) comparing if there is any image change on the determined detected area after the e) step, and going back to the step S
4
if any image change is not detected; and g) generating alarm if image change is detected in the f) step, and completing the operation.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 4706075 (1987-11-01), Hattori et al.
patent: 4922339 (1990-05-01), Stout et al.
patent: 4929935 (1990-05-01), Rysavy et al.
patent: 5396284 (1995-03-01), Freeman
patent: 5623304 (1997-04-01), Ota et al.
patent: 5671009 (1997-09-01), Chun
patent: 94-8813 (1994-09-01), None
patent: 96-6637 (1996-02-01), None
patent: 96-16569 (1996-05-01), None
Britton Howard
Diep Nhon T
Greer Burns & Crain Ltd.
Samsong Industries, Ltd.
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