JP3033198B2 - Monitoring video signal recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance video signal recording apparatus for combining text information with a video signal and recording it.

[0002]

2. Description of the Related Art In recent years, a video signal recording apparatus for surveillance has become the main stream in which text information such as the date and time and the situation at the time of shooting is combined with a shot video and recorded.

FIG. 3 is a block diagram showing a conventional monitoring video signal recording apparatus. In FIG. 3, reference numeral 1 denotes a video camera, 2 denotes a character information generating circuit for generating characters and information necessary for monitoring such as date and time, and 3. A character synthesizing circuit for synthesizing the character information output from the character information generating circuit 2 with the video signal output from the video camera; and 4, a video signal recording circuit for recording the video signal on a recording medium such as a magnetic tape. 5 is a character synthesis circuit 3
Character position control circuits 1 and SW1, which control a combination position of character information to be sent to a video signal by sending a control signal, are switches.

A conventional monitoring video signal recording apparatus having the above-described components will be described below with reference to FIGS.

FIG. 4 shows the position of character information to be combined with the video signal, and A to D are the combination positions of the character information. The video signal output from the video camera 1 is
The character information is combined with the character information generated from the character information generating circuit 2 by the character synthesizing circuit 3 and then recorded on the recording medium by the video signal recording circuit 4. The combination position of the character information to be combined with the video signal can be determined by operating the switch SW1 to set the character position control circuit A.
5 allows the user to set an arbitrary position in A to D on the imaging screen shown in FIG.

[0006]

However, in the above-described conventional configuration, when the monitored object moves to the position where the character information is synthesized on the image pickup screen, the object is obstructed by the character information and is not sufficiently disturbed. There was a problem that it could not be monitored.

In order to solve the above problems, the present invention provides a surveillance video signal recording apparatus capable of sufficiently monitoring an object to be monitored even if the object moves to an arbitrary position on an imaging screen. With the goal.

[0008]

In order to achieve the above object, the present invention provides a character information generating circuit, a character synthesizing circuit for synthesizing character information output from the character information generating circuit with a video signal, and at least one character synthesizing circuit. A frame memory circuit that records and outputs a video signal of a frame, a comparison circuit that compares a current video signal and a video signal one frame before output from the frame memory circuit, A motion discriminating circuit for detecting a motion of an image of each area of the screen divided into a plurality of regions, and a character position control circuit for controlling a combination position of character information to be combined with a video signal based on a result of the discrimination by the motion discrimination circuit It has become.

[0009]

According to the present invention, in the above configuration, the current video signal is compared with the video signal one frame before output from the frame memory circuit by the comparison circuit, and the motion discriminating circuit uses the output of the comparison circuit. Detect image movement. Then, the character position control circuit controls the synthesis position of the character information to be synthesized with the video signal based on the motion information from the motion discrimination circuit, so that the image is synthesized so as to be synthesized in an area where the image does not move.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A monitoring video signal recording apparatus according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of one embodiment of the present invention. In FIG. 1, reference numerals 1 to 4 denote the same components as those in FIG. Reference numeral 6 denotes a frame memory circuit that stores and outputs at least one frame of video signal, 7 denotes a comparison circuit that compares a current video signal with a video signal of one frame before output from the frame memory circuit 6, and 8 denotes a comparison circuit. A motion discriminating circuit 9 detects the motion of the image using the output, a character position control circuit 2, which controls the synthesizing position of the character information to be synthesized with the video signal, and a switch 2, SW2 and SW3.

A surveillance video signal recording apparatus according to the present embodiment comprising the above components will be described below with reference to FIGS.
The relationship and operation of each component will be described with reference to FIG.

FIG. 2 shows the position of the character information to be combined with the video signal and the division of the imaging screen. E to H indicate the positions of the character information to be combined with the video signal, and I to D indicate the divided areas of the imaging screen. , And each divided area always includes one combination position of character information. The video signal output from the video camera 1 is combined with the character information generated from the character information generating circuit 2 by the character synthesizing circuit 3 in the same manner as in the conventional example, and further recorded on the recording medium by the video signal recording circuit 4.
On the other hand, the video signal output from the video camera 1 is also input to the frame memory circuit 6 and the comparison circuit 7.
Compares the video signal output from the video camera 1 with the video signal one frame before output from the frame memory circuit 6. Then, as shown in FIG. 2, the motion determining circuit 8 detects an area in which the image has a motion among the four divided areas of the imaging screen, and outputs a detection signal to the character position control circuit B9. If the area where the character information is synthesized (for example, if the character information is at the position E, the area becomes A) is included in the area where the image has motion, the character position control circuit 2 deletes the character information. The image is synthesized at a predetermined position in an area where the image does not move. The initial combination position of the character information is determined by the switch SW2.
Can be set to any position from E to H. Further, by operating the switch SW3, it is possible to fix the combining position of the character information to an arbitrary position from E to H.

As described above, according to the present embodiment, a frame memory for recording and outputting at least one frame of a video signal as a generator of motion information of an image to be input to a character position control circuit for controlling a synthesis position of character information. Circuit, a comparison circuit for comparing the current video signal with the video signal of one frame before output from the frame memory circuit, and utilizing the output of the comparison circuit to determine the motion of the image in each of the plurality of divided regions. By providing the motion discriminating circuit for detection, character information can be synthesized outside the area to which the monitored object belongs.

In the above description, the screen division is performed in the motion discriminating circuit 8. However, the division is performed in the comparing circuit 7 for comparison, and the motion discriminating circuit 8
It is also possible to determine only in which area there is a movement.

Further, in the present embodiment, although the imaging screen is divided into four regions to detect the motion of the image, the number of the divided regions is increased, so that the synthesis position of the character information can be controlled more accurately. You may. Also, the central part where an important monitoring target is likely to appear may be set out of the divided area.

Further, in this embodiment, character information is used as information indicating a situation at the time of shooting, but other information such as a video may be used.

[0017]

As described above, according to the present invention, even if an object to be monitored moves to an arbitrary position on the imaging screen, it can be sufficiently monitored without being disturbed by character information. It is possible to provide a surveillance video signal recording device that achieves an excellent effect.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a monitoring video signal recording device according to an embodiment of the present invention.

FIG. 2 is also an illustration showing the position of character information and the division of an imaging screen.

FIG. 3 is a configuration diagram of a conventional monitoring video signal recording device.

FIG. 4 is an explanatory diagram showing the positions of character information of the monitoring video signal recording device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video camera 2 Character information generation circuit 3 Character synthesis circuit 4 Video signal recording circuit 5 Frame memory circuit 6 Comparison circuit 7 Motion discrimination circuit 8 Character position control circuit SW2, SW3 switch

Claims (1)

(57) [Claims] 1. A character information generating circuit, a character synthesizing circuit for synthesizing character information output from the character information generating circuit with a video signal, a frame memory circuit storing and outputting at least one frame of a video signal, A comparison circuit that compares the video signal of the previous frame and the video signal of one frame before output from the frame memory circuit, and detects the motion of the image in each area of the screen divided into a plurality by using the output of the comparison circuit. A monitoring video signal recording device, comprising: a motion determination circuit; and a character position control circuit that controls a synthesis position of character information to be synthesized with a video signal based on a determination result of the motion determination circuit.