JP3208804B2 - 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 monitoring video signal recording apparatus using an auto-focus video camera.

[0002]

2. Description of the Related Art In recent years, surveillance video signal recording apparatuses have mainly used a method of recording a video signal using an auto-focus video camera.

Hereinafter, a conventional monitoring video signal recording device will be described with reference to the drawings. As shown in FIG.
A conventional monitoring video signal recording apparatus includes a video camera 1, a video signal recording circuit 2 for recording the video signal on a recording medium such as a magnetic tape, and a video camera 1 using the video signal output from the video camera 1. The camera includes an iris control circuit 3 for controlling the iris and a focus control circuit 4 for controlling the focus of the video camera 1 using a video signal output from the video camera 1.

The operation of the monitoring video signal recording apparatus configured as described above will be described below with reference to FIGS.

FIG. 4 shows an image pick-up screen picked up by the video camera 1, and an area F at the center of the screen shows a fixed area where the iris and the focus are optimally controlled on the image pick-up screen. . The video signal output from the video camera 1 is recorded on a recording medium by the video signal recording circuit 2. On the other hand, the iris control circuit 3 controls the iris of the video camera 1 using the video signal output from the video camera 1 so that the brightness in the F region in FIG.
Further, the focus control circuit 4 controls the focus of the video camera 1 using the video signal output from the video camera 1 so that the focus in the F region in FIG.

[0006]

However, in the above-mentioned conventional configuration, the area where the iris and the focus are optimally controlled on the imaging screen is fixed at a fixed position on the imaging screen, so that the object to be monitored is fixed. However, when the iris and the focus are moved out of the area where the iris and the focus are optimally controlled on the imaging screen, there is a problem that the monitoring object cannot be clearly monitored.

The present invention solves the above-mentioned conventional problems, and provides a monitoring video signal recording apparatus capable of clearly monitoring an object to be monitored even if the object to be monitored moves to an arbitrary position on an imaging screen. The purpose is to provide.

[0008]

In order to achieve the above object, a surveillance video signal recording apparatus according to the present invention comprises a frame memory circuit for storing and outputting at least one frame of video signal, a current video signal and a frame memory. A comparison circuit that compares the video signal one frame before output from the circuit, a motion discrimination circuit that detects the motion of an image using the output of the comparison circuit, a video camera for capturing an image, an output of the motion discrimination circuit and video An iris control circuit that controls the iris of the video camera using a video signal output from the camera, and a focus control circuit that controls the focus of the video camera using the output of the motion determination circuit and the video signal output from the video camera Configuration.

[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 discrimination circuit uses the output of the comparison circuit to generate the image. The motion is detected, and the iris control circuit and the focus control circuit can control the iris and the focus of the video camera based on the motion information from the motion discrimination circuit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to a screen.

As shown in FIG. 1, in the monitoring video signal recording apparatus of the present invention, the same components as those of the conventional example shown in FIG. The apparatus includes a frame memory circuit 5 for storing and outputting at least one frame of video signal, a current video signal and the frame memory circuit 5.
The comparison circuit 6 compares the video signal of one frame before to be outputted from the video camera 1, the motion discrimination circuit 7 detects the motion of the image using the output of the comparison circuit 6, An iris control circuit 8 for controlling the iris of the video camera 1 using the video signal; a focus control circuit for controlling the focus of the video camera 1 using the output signal of the motion determination circuit 7 and the video signal output from the video camera 1 9.

With respect to the monitoring video signal recording apparatus composed of the above components, the relationship and operation of each component will be described with reference to FIGS.

FIG. 2 shows an image pickup screen picked up by the video camera 1 and division of the image pickup screen.
E indicate divided areas of the imaging screen. The video signal output from the video camera 1 is recorded on a recording medium by the video signal recording circuit 2 as in the conventional example. On the other hand, the video signal output from the video camera 1 is also input to the frame memory circuit 5 and the comparison circuit 6, where the video signal output from the video camera 1 and the video signal one frame before output from the frame memory circuit 5 are output. Compare. Then, as shown in FIG.
An area in which the image has motion is detected among the divided areas, and a detection signal is output to the iris control circuit 8 and the focus control circuit 9. Further, the iris control circuit 8 and the focus control circuit 9 respectively control the iris and the focus of the video camera 1 so that the area where the image detected by the motion discrimination circuit 7 has a motion has the optimum brightness and focus. If there is no moving area in the imaging screen, the iris control circuit 8 and the focus control circuit 9 adjust the iris and focus of the video camera 1 so that the area E in the imaging screen has optimal brightness and focus. Control. When one or more moving areas are present in the image detected by the motion discriminating circuit 7, the iris control circuit 8 and the focus control circuit 9 operate in accordance with a preset order. The iris and the focus of the video camera 1 are sequentially controlled at preset time intervals so that a moving area has optimal brightness and focus. With this, even if there are multiple moving objects,
Each object can be clearly monitored at regular intervals.
You.

As described above, according to this embodiment, at least one frame of a video signal is used as a generator of image motion information input to the iris control circuit 8 and the focus control circuit 9 for controlling the iris and focus of the video camera 1. Memory circuit 5 for storing and outputting the image data, a comparison circuit 6 for comparing the current video signal with the video signal of one frame before output from the frame memory circuit 5, and using the output of the comparison circuit 6 to determine the motion of the image. By providing the motion discriminating circuit 7 for detecting, it is possible to optimally control the iris and focus of the video camera in a region to which a moving object belongs.

In the above description, the screen is divided in the motion discriminating circuit 7. However, the division is performed in the comparing circuit 6 for comparison, and the motion discriminating circuit 7
It is also possible to determine only in which area there is a movement.

In this embodiment, the image screen is divided into five regions to detect the movement of the image. However, by further increasing the number of divided regions, the iris and focus of the video camera can be more accurately focused on a moving object. Can be optimally controlled.

[0017]

As is clear from the above embodiments, according to the present invention, the object to be monitored can be clearly monitored even if it moves to an arbitrary position on the imaging screen . Also,
Even when a number of objects move, each object is
It is possible to realize a monitoring video signal recording device that achieves an excellent effect of enabling clear monitoring .

[Brief description of the drawings]

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

FIG. 2 is a divided view of an imaging screen of the embodiment.

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

FIG. 4 is a division view of the imaging screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video camera 2 Video signal recording circuit 5 Frame memory circuit 6 Comparison circuit 7 Motion discrimination circuit 8 Iris control circuit 9 Focus control circuit

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 7/18 H04N 5/225 H04N 5/232

Claims (1)

(57) [Claims] 1. A video camera and a video camera
Recording means for recording a video signal to be output, and the video signal
Screen is divided into multiple areas and the presence or absence of motion is determined for each area.
A motion discriminating means for discriminating, and discrimination by the motion discriminating means.
Focus on the video camera
Or control means to control the iris to be optimal
In the monitoring video signal recording device provided with
If there are a plurality of areas with motion determined by steps,
The control means preliminarily controls each of the moving areas.
In the set order and time interval,
The characteristic is that it controls so that the
Monitoring the video signal recording apparatus according to.