JP2607186Y2 - Surveillance camera system - 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 camera system that enables efficient installation.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional surveillance camera system.
As shown in the figure, a plurality of camera imaging units a, b, c, and d can be driven simultaneously, and coaxial lines a1, b
1, c1, and d1, the power supply from the monitor unit m to the camera imaging unit is supplied via a coaxial line, and the video signal from the camera imaging unit is transmitted to the monitor unit m via the same coaxial line. is there. The monitor unit m is further provided with video signal switching means for sequentially switching video signals from the four camera imaging units a, b, c, and d and monitoring the video signals on one monitor television mt. . Further, in order to prevent the image from being disturbed at the time of switching the video signal, control is also performed to substantially match the phase of the vertical synchronization of each camera imaging unit.

[0003]

Here, when it is attempted to monitor the inside of a building as shown in FIG. 7 using the above-described surveillance camera system, four camera imaging units are insufficient, and one more camera imaging unit is required. It is necessary to add a stand and a camera imaging unit e. Then you have to add a four-system for one more.

[0004] That is, in the conventional surveillance camera system, when the number of camera imaging units slightly exceeding the number of camera imaging units of one system is required, an additional power supply unit for one system is required, which is expensive. Had the problem of becoming

[0005] As one means for solving the above problems,
Means of constantly turning the camera imaging unit d shown in FIG. 7 using a swivel table to expand the monitoring area is conceivable. However, in the monitoring by such a method, the image in the panning state suddenly enters the image in the still state which is sequentially switched, and gives an uncomfortable feeling to the observer.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive surveillance camera system which suppresses the addition of a shortage of a camera image pickup unit and does not cause an observer to feel uncomfortable.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a surveillance camera system including a plurality of camera imaging units each having at least one synchronization signal detecting unit for detecting the presence or absence of a supplied synchronization signal. A camera imaging unit,
A synchronization signal supply unit that supplies a synchronization signal to the plurality of camera imaging units; a video signal switching unit that sequentially switches video signals from the plurality of camera imaging units; and a synchronization signal according to an operation of the video signal switching unit. A prohibition unit that controls a supply unit and prohibits the supply of a synchronization signal to the camera imaging device having the synchronization signal detection unit, and the synchronization signal detection unit in response to the absence of the synchronization signal being detected by the synchronization signal detection unit. An imaging range switching unit that switches an imaging range by turning a camera imaging unit or moving a mirror provided on an optical axis of the camera imaging unit.

[0008]

The types of images switched by the video signal switching means are larger than the number of camera imaging units.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram of a surveillance camera system according to an embodiment of the present invention. In the figure, A, B, C,
D is a camera imaging unit. The camera imaging unit A includes a power supply circuit 1a, a video circuit 2a, and a synchronization signal generation circuit 3a that generates a synchronization signal that is a control signal. The camera imaging units B, C, and D include power supply circuits 1b, 1c, and 1d, video circuits 2b, 2c, and 2d, and pulse separation circuits 4b, 4c, and 4
d, and synchronization circuits 5b, 5c, and 5d, respectively. Further, the camera imaging unit D includes a synchronization signal detection circuit 6d.
And a swivel 7 are provided.

On the other hand, M is a monitor section, which includes a power supply circuit 8, video signal separation circuits 9a, 9b, 9c, 9d, a synchronization signal separation circuit 10a, and synchronization signal addition circuits 11b, 11c.
11d, a video signal changeover switch 12, a control circuit 13, and a switch 14 which is a prohibiting means for prohibiting the supply of a synchronization signal to the camera imaging unit D. Note that the camera imaging units A, B, C, and D and the monitor unit M
a, 15b, 15c, and 15d.

Next, the operation of the camera image pickup section A will be described. The video circuit 2a receives a synchronization signal from the synchronization signal generation circuit 3a, converts light from a subject (not shown) into a video signal, and converts the video signal including the synchronization signal into a coaxial line 15a.
Is supplied to the monitor section M via the. The monitor M
Thereafter, power is supplied from the power supply circuit 8 to the power supply circuit 1a via the coaxial line 15a, and the power supply circuit 1a supplies power corresponding to the video circuit 2a and the synchronization signal generation circuit 3a, respectively. In the monitor section M, the video circuit 2a sends the coaxial line 15a
The video signal including the synchronization signal supplied via the video signal separation circuit 9a is separated by the video signal separation circuit 9a and supplied to the video signal changeover switch 12. Further, the synchronizing signal supplied from the video circuit 2a via the coaxial line 15a is separated by the synchronizing signal separating circuit 10a, supplied to the synchronizing signal adding circuits 11b and 11c, and further through the switch 14 to the synchronizing signal adding circuit 11d. To supply.

Next, the operation of the camera image pickup units B and C will be described. The video circuits 2b and 2c respectively include a synchronization circuit 5b,
Light from a subject (not shown) is converted into a video signal based on the synchronization signal supplied via the video signal 5c, and the video signal including the synchronization signal is converted to the monitor M via the coaxial lines 15b and 15c.
To supply. The synchronizing circuits 5b and 5c are supplied with synchronizing signals from the synchronizing signal generating circuit 3a which are added to the coaxial lines 15b and 15c by the synchronizing signal adding circuits 11b and 11c and separated by the pulse separating circuits 4b and 4c. Is done. Also,
The power supply circuits 1b and 1c are connected to the power supply circuit 8 of the monitor M.
And supplies power supplied via the coaxial lines 15b and 15c from the camera, and supplies power corresponding to each unit of the camera imaging units B and C, respectively. In the monitor section M, video signals including synchronization signals supplied from the video circuits 2b and 2c via the coaxial lines 15b and 15c are separated by the video signal separation circuits 9b and 9c and supplied to the video signal changeover switch 12.

Next, the operation of the camera image pickup unit D will be described. The video circuit 2d converts light from a subject (not shown) into a video signal based on a synchronization signal supplied via the synchronization circuit 5d, and converts the video signal including the synchronization signal into a coaxial cable 15d.
The signal is supplied to the monitor section M via d. Note that the synchronization circuit 5
To d, a synchronizing signal from a synchronizing signal generating circuit 3a which is added to the coaxial line 15d by a synchronizing signal adding circuit 11d and separated by a pulse separating circuit 4d is supplied. The power supply circuit 1d is connected to the coaxial line 1 from the power supply circuit 8 of the monitor M.
5d, power is supplied to the camera
Supply power according to each part of. In the monitor section M, the video signal including the synchronization signal supplied from the video circuit 2d via the coaxial line 15d is separated by the video signal separation circuit 9d.
It is supplied to the video signal changeover switch 12. Further, the synchronization signal detection circuit 6d detects the presence or absence of the synchronization signal separated by the pulse separation circuit 4d, and drives the swivel 7 according to the detection result.

Next, the operation of the monitor section M will be described. The video signals from the camera imaging units A, B, C, and D separated by the video signal separation circuits 9a, 9b, 9c, and 9d are supplied to a video signal switch 12, and the video signal switch 12 is connected to a control circuit. 13 is controlled as shown in the timing chart of FIG. That is, the video signal supplied to the monitor television (not shown) is cyclically switched at each time interval T1. Since the video signals are formed in the camera imaging units B, C, and D based on the synchronization signal from the camera imaging unit A, even if the video signal is switched by the video signal switch 12, the discontinuity of the synchronization signal may occur. Does not cause the image disturbance immediately after the switching.

On the other hand, the control circuit 13 also controls the switch 14. That is, the video signal changeover switch 12
2, during a period in which the video signal from the camera imaging unit D is not supplied to the monitor television, a predetermined period (T2) required to switch the imaging range of the camera imaging unit D using the swivel 7 as shown in FIG. ), The switch 14 is released so that the synchronizing signal from the synchronizing signal generating circuit 3a provided in the camera imaging section A is not added to the coaxial line 15d by the synchronizing signal adding circuit 11d. Then, the synchronization signal detection circuit 6d provided in the camera image pickup unit D includes a pulse separation circuit 4d
When it is detected that the synchronization signal cannot be separated, that is, that the synchronization signal is not added to the coaxial line 15d, the swivel 7 is driven, and as shown in FIG. To range 2 or from range 2 to range 1. Therefore, the images based on the video signals from the camera imaging units A, B, and C are referred to as an image A, an image B, and an image C, respectively.
Assuming that the image based on the video signal when the camera imaging unit D is capturing the range 1 is an image D1 and that when capturing the range 2 is the image signal D2, as shown in FIG. The images to be projected are image A, image B, image C, image D1, image A, image B, image C, image D2, image A,
Image B is cyclically switched. The images D1 and D2
Is an image in a state where the camera imaging unit D is stationary, and is a stationary state which is not a panning state, and does not give an observer an uncomfortable feeling.

Although the operation of the embodiment of the present invention has been described above, the means for switching the imaging range may be to move the mirror ml instead of turning the camera imaging unit as shown in FIG. . Also, instead of switching the imaging range to two, for example, the camera imaging unit may be able to rotate 360 degrees on a swivel, and may be switched to three or four. Further, the means for switching the imaging range may be provided in a plurality of camera imaging units.

[0017]

According to the present invention, even when the number of camera image pickup units slightly exceeding the number of camera image pickup units in one system is required, the shortage of camera image pickup units can be suppressed.
In addition, the images to be switched are all in a stationary state that is not a panning state, so that an inexpensive surveillance camera system that does not cause an uncomfortable feeling to an observer can be provided, and the effect is great.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing the operation of the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing the operation of the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an operation of another embodiment of the present invention.

FIG. 6 is a functional block diagram showing a conventional technique.

FIG. 7 is an explanatory diagram showing a problem of the related art.

[Explanation of symbols]

 A, B, C, D Camera imaging unit M Monitor unit 3a Synchronous signal generation circuit 6d Synchronous signal detection circuit 7 Swivel table 11b, 11c, 11d Synchronous signal addition circuit 12 Video signal changeover switch 13 Control circuit 14 Switch

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/225 G08B 25/00 510 H04N 7/18

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of camera imaging units including at least one camera imaging unit having a synchronization signal detecting unit for detecting the presence or absence of a supplied synchronization signal, and a synchronization signal for supplying a synchronization signal to the plurality of camera imaging units A camera unit comprising: a supply unit; video signal switching means for sequentially switching video signals from the plurality of camera imaging units; and the synchronization signal detection means for controlling the synchronization signal supply unit in accordance with the operation of the video signal switching means. Prohibiting means for prohibiting the supply of a synchronization signal to the camera, and turning the camera imaging unit having the synchronization signal detection means in response to the detection of the absence of the synchronization signal by the synchronization signal detection means or the optical axis of the camera imaging unit. A surveillance camera system comprising: an imaging range switching unit that switches an imaging range by moving a mirror provided above.