CCTV system having improved detection function and detecting method suited for the system

An identification code reproducing apparatus for use in a closed circuit television (CCTV) system which includes a plurality of monitoring cameras which output camera signals to a plurality of channels, frame switching means for switching between the plurality of channels at a predetermined frame cycle rate, thereby selecting one of the camera signals and outputting a selected camera signal, generating an ID code according to physical event and/or time of day conditions of the switched camera signal and adding the ID code to the switched camera signal, thereby generating an added camera signal, an image recording and reproducing apparatus for recording the added camera signal, reproducing the recorded signal and outputting the reproduced signal to the frame switching means, display dividing means for displaying, as multiscreen picture on a monitor, the camera output which is reproduced and output through the frame switching means, wherein the frame switching means comprises:

• reproduced-signal input means for inputting the signal reproduced by the image recording and reproducing apparatus;
• separating means for separating the ID code from the reproduced signal input from said reproduced-signal input means;
• controlling means for comparing said ID code separated by said separating means with an ID value representing a user-designated physical event and time-of-day condition to be detected, and generating a display control signal;
• display generating means for generating a first display signal corresponding to said user-designated condition and a second display signal corresponding to a physical event and time-of-day condition of said reproduced signal, according to said display control signal;
• and
• mixing means for mixing the ID code separated from the reproduced signal input by said reproduced signal input means with said reproduced signal corresponding to said user-designated physical event and time-of-day condition, and displaying the mixed signal on a monitor.

A detecting apparatus for use in a closed circuit television (CCTV) system comprising a plurality of monitoring cameras for outputting camera signals to a plurality of channels, frame switching means for switching between the plurality of channels at a frame cycle rate, thereby selecting one of the camera signals, an image recording and reproducing apparatus for recording on a recording medium the camera signal selected by the frame switching means, reproducing the recorded signal, and outputting the reproduced signal to the frame switching means, display dividing means for displaying the camera signal which is reproduced and output through the frame switching means as a multiscreen picture, wherein said frame switching means comprises:

• a plurality of camera signal input means for inputting the camera signals output from the plurality of monitoring cameras;
• switching means for switching between the plurality of channels input to said plurality of camera signal input means, thereby outputting a selected camera signal;
• sensing means for outputting a sensing signal by sensing with respect to predetermined conditions;
• first detecting means for detecting synchronization signals from said selected camera signal and outputting a first detection signal;
• second detecting means for detecting motion based on said selected camera signal and outputting a second detection signal;
• ID code generating means for generating an ID code in accordance with a predetermined physical and time-of-day conditions ID code corresponding to said sensing signal, said first detection signal and said detection signal;
• adding means for adding said generated ID code to said selected camera signal during a vertical retrace period of said selected camera signal, and outputting the added result to said image recording and reproducing apparatus;
• reproduced-signal input means for inputting the signal reproduced by said image recording and reproducing apparatus;
• separating means for separating said ID code from the reproduced signal input from said reproduced-signal input means;
• controlling means for comparing said ID code separated by said separating means with an ID value representing a user-designated physical event and time-of-day condition to be detected, and outputting a display control signal;
• display generating means for generating a first display signal corresponding to said user-designated physical event and time-of-day condition to be detected and a second display signal corresponding to a physical and time-of-day condition of the recorded signal, according to said display control signal;
• and
• mixing means for mixing the ID code separated from the reproduced signal input by the reproduced-signal input means with said reproduced signal corresponding to said user-designated physical event and time-of-day conditions, and displaying the mixed signal on a monitor.

An image recording and reproducing apparatus for recording a signal generated from a camera on a recording medium and reproducing the recorded signal, the apparatus comprising:

• input means for inputting the signal generated from the camera;
• sensing means for sensing predetermined conditions and outputting a sensing signal;
• first detecting means for detecting synchronization signals of the camera signal and outputting a first detection signal;
• second detecting means for detecting motion based on the camera signal and outputting a second detection signal;
• ID code generating means for generating an ID code in accordance with predetermined physical event and time-of-day conditions corresponding to said sensing signal, said first detection signal, and said second detection signal;
• recording means for adding said ID code to the camera signal during a vertical blanking period of the camera signal, and recording the added result on the recording medium;
• reproducing means for reproducing the signal recorded on the recording medium;
• detecting means for detecting an ID code of the signal reproduced by said reproducing means;
• controlling means for comparing the detected ID code with an ID value representing a user-designated physical event and time-of-day condition to be detected, and outputting a display control signal;
• display generating means for generating a first display signal corresponding to said user-designated condition to be detected, and a second display signal corresponding to a physical event and time-of-day condition of said reproduced signal, according to said display control signal;
• and
• mixing means for mixing said detected ID code with a reproduced signal corresponding to said user-designated physical event and time-of-day condition to be detected, and displaying the mixed signal on a monitor.

A detecting method for use in a closed circuit television (CCTV) system for switching between a plurality of channels carrying camera signals generated from a plurality of monitoring cameras, recording a physical event and time-of-day condition ID code with one of the switched camera signals on a recording medium, reproducing a desired picture among the recorded signal recorded on the recording medium, and displaying the reproduced picture, the detecting method comprising the steps of:

• (a) inputting a physical event and time-of-day condition to be detected;
• (b) displaying a user designation mode corresponding to said physical event and time-of-day condition to be detected input in step (a);
• (c) determining whether the ID code contained in the reproduced signal of the reproduced desired picture corresponds to said physical event and time-of-day condition input in step (a);
• and
• (d) displaying the reproduced signal when said ID code determined in step (c) corresponds to said physical event and time-of-day condition input in step (a).