JPH0423689A - Control method of CCTV camera with electronic shutter - Google Patents

Abstract

PURPOSE:To simplify installation of signal wiring and to reduce the installation cost by converting a parallel data from an electronic shutter or the like into a serial data, synthesizing the data with a latch clock and transferring the synthesized signal to a CCTV camera via one signal line. CONSTITUTION:Data A, B, C, D shifted sequentially by an input clock signal are outputted from a shift register 6 in a serial form. Simultaneously, a control section 9c outputs a data latch clock before each data for each serial data and the clock is synthesized with the serial data at a synthesis section 9, and the synthesis signal is transferred to a CCTV camera via a signal line 10. A shift register 12 in the CCTV camera uses a data latch clock to shift the serial data A, B, C, D and they are outputted in parallel form from each Q output terminal. Thus, in the case of data transfer from the electronic shutter, one signal line 10 is enough for the purpose and the installation work cost is reduced.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is applicable to CCTVs with electronic shutters (C1osed
The present invention relates to a CCTV system equipped with a camera, and more specifically to a control method for a CCTV camera with an electronic shutter that allows the monitoring side to remotely control the CCTV camera with an electronic shutter.

[Conventional Example] In recent years, electronic shutters have come to be attached to cameras used in CCTV systems, and it has become possible to arbitrarily vary the speed of the electronic shutter. For example, as shown in FIG. 3, a CCTV camera with an electronic shutter includes a timing generation IC circuit 1 having an electronic shutter function.
The electronic shutter operates according to the setting data. A setting switch 2 for obtaining the setting data is provided on the housing of the CCTV camera, and when the switch 2a is turned on, that is, when the ENB terminal of the timing generation IC circuit 1 goes to "L" level, other Data (“L” and “H”) corresponding to the ON and OFF states of the switches 2b to 2d are input to the timing generation circuit 1.

This timing generation IC circuit 1 controls the shutter of a camera with an electronic shutter. The timing generating IC circuit 1 is already commercially available, and generates various timing signals in addition to the signals for controlling the electronic shutter.

In addition, the CCTV camera with an electronic shutter is equipped with an imaging unit 3 incorporating an electronic shutter, a signal processing unit 4 that processes the signal obtained by the imaging unit 3, and the like, and the processed signal (video signal) is It is designed to be sent to the monitoring side via a cable or the like. As a result, the video captured by the imaging unit 3 is displayed on the monitor device on the monitoring side, allowing the user to monitor a predetermined area while staying there.

By the way, the setting switch 2 is a CCT with an electronic shutter.
Since it is provided inside the housing of the V camera, when changing the setting data of the electronic shutter, it is necessary to remove the cover and operate the switches 2a, 2b, 2c, and 2d.

In addition, CC equipped with the above-mentioned CCTν camera with electronic shutter
The TV system is security FA (Fact
When the CCTV camera with an electronic shutter is used in the field of Automation or traffic enforcement, etc., the CCTV camera with an electronic shutter is often located far away from the monitoring side. This has the problem of being troublesome.

Therefore, the above setting switch 2 is connected to a CCTV with an electronic shutter.
It is conceivable to provide a camera on the monitoring side and remotely control its electronic shutter and the like from the monitoring side.

[Problems to be Solved by the Invention] However, as shown in FIG. 3, since the setting data consists of multiple bits, when trying to transfer the setting data, the signal line of that number of bits is connected to a C with an electronic shutter.
Since it has to be installed between the CTV camera 1 and the monitoring side, the installation is complicated and construction costs are high.In particular, the further apart they are, the more difficult it is to install and the construction costs increase. Ta.

This invention was made in view of the above-mentioned problems, and its purpose is to be able to transfer electronic shutter setting data, etc. via a single signal line, to simplify the signal line arrangement, and to reduce construction costs. An object of the present invention is to provide a control method for a CCTV camera with an electronic shutter that can be performed at low cost.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for displaying images taken by a CCTV camera with an electronic shutter on a monitor device on the monitoring side. In the method for controlling a CCTV camera with an electronic shutter, the monitoring side converts parallel data from the electronic shutter, etc. into serial data, generates a latch clock for the data, and converts the parallel data from the electronic shutter, etc. into serial data, and generates a latch clock for the data. The combined signal is transferred to the electronic shutter-equipped CCTV camera via one line of signal line, and the electronic shutter-equipped CCTV camera
The receiving side of the camera separates the data latch clock based on the transferred data, converts the serial data into parallel data using the separated data latch clock, and receives the data from the electronic shutter, etc. in one line. The gist is that it is now transferable.

[Function] In the above control method, when data such as the electronic shutter of the CCTV camera is set by the setting switch and the transfer instruction switch is operated, the setting data (parallel data) is transferred to the shift register by the control signal from the control unit. is converted into serial data, and the control unit outputs a data latch clock corresponding to the serial data. At this time, the clock counter section is activated simultaneously with the parallel/serial data conversion operation and the high voltage of the data latch clock. Then, the serial data and the data latch clock are synthesized in the synthesis section, but since the data latch clock is synthesized before each bit of serial data (for example, 4-bit data), the serial data and the data latch clock are synthesized before each bit data. The latch clock can be transferred to the CCTV camera side via one signal line.

Further, the clock counter section counts a number according to the bits of the transfer data, and when that number is reached, a transfer end signal is output to the control section.

Therefore, since the parallel/serial data conversion operation and data latch clock output are stopped in the control section, only the above 4-bit data (data from electronic shutter, etc.) and the data latch clock before each bit are output. be done.

On the other hand, in a CCTV camera that receives serial data transferred via one signal line, the data latch clock is separated in a clock separation circuit, and the serial data is transferred to the data latch clock in a shift register. Converted to parallel at the right time. The data converted by this shift register becomes the data of the electronic shutter drive unit, so the controller side
The camera's electronic shutter, etc. can be controlled by remote control.

In this way, data from electronic shutters, etc. can be converted into serial data and transferred, so only one signal line is required for the transfer, reducing the number of cables, etc. laid between the controller side and the CCTV camera. You'll end up needing less.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. In FIG. 1, the same parts and corresponding parts as in FIG. 3 are denoted by the same reference numerals, and redundant explanation will be omitted.

In Figure 1, the monitoring side of the CCTV system, that is, C
The side that transmits data such as the electronic shutter of a CTV camera has a setting switch 5 for setting the data, a shift register 6 for sequentially shifting the setting data and converting it into serial data, and a conversion of the serial data. A transfer instruction switch 7 for instructing the start of transfer, a control unit M8 for converting the setting data (parallel data) into serial data according to the instruction to start the transfer, and outputting a latch clock for the serial data; It also includes a synthesizing section 9 that synthesizes data latch clocks and transfers the synthesized data to the CCTV camera side. The control device 8 includes a clock generation section 8a, a clock counter section 8b, a control section 80, etc. When the transfer switch 7 is turned on, the control section 8c outputs the data load signal of the shift register 6 and the clock counter. The control multiplication amount, data latch clock, etc. of the section 8d are output. Then shift register 6
The setting data is shifted, the parallel data (setting data) is converted to serial data, and the clock counter section 8b converts a predetermined number of clocks into the shift register 6.
When the number of shifts (the number of bits of the setting data) is counted, a transfer end signal is output.

A method of controlling a CCTV camera with an electronic shutter applied to the CCTV system having the above configuration will be explained based on the time chart shown in FIG.

First, it is assumed that the setting switch 5 is operated on the monitoring side to set electronic shutter data, and then the transfer instruction switch 7 is turned on. Then.

Since the transfer start signal is input to the control section 8C, the control section 9 outputs a data load clock signal to the shift register 6 in synchronization with the clock from the clock generation section 9a. At this time, each switch 5a of the setting switch 2
, 5b, 5c, and 5d are input to the shift register 6 in parallel format, so data A, B, C, and D sequentially shifted by the input clock signal are output from the shift register 6 in serial format. (shown in (a) of the same figure). At the same time, a data latch clock is output from the control unit 9C at a predetermined timing, and the timing of the data latch clock is generated for each serial data and before each data (as shown in FIG. ). Then, as shown in the same figure (c), these data latch clocks and serial data are synthesized in the synthesis section 9, and this synthesized signal is transferred to the CCTV camera side via one line of signal line 10. be done.

In this case, since the setting data are A, B, C, and D, the clock counter section 8b outputs a reset signal, that is, a transfer end signal, to the control section 9C at the timing of the fifth lock signal. Therefore, in the control section 9C, after outputting the clock signal for loading the last data A from the shift register 6, the output of the next clock, data latch clock, etc. is stopped, and the output of the shift register 6, the synthesis section 9, etc. is stopped. Control is stopped.

That is, the parallel data A is stored on the monitoring side 6.

B, C, and D are sequentially converted into serial data, and the serial data and a data latch clock that enables the data to be latched are alternately transferred to the CCTV camera 1 with an electronic shutter via the signal wirework 0. On the other hand, CCT
The V camera has, for example, a separation unit 11 that separates a data latch clock from a received signal, a shift register 12 that converts serial data into parallel data using this data latch clock, and the same functions as the timing generation IC circuit 1 shown in FIG. an electronic shutter drive unit 1 which inputs the converted parallel data and outputs a control signal etc. for an electronic shutter (for example, a CCD shutter) 13 of a CCTV camera.
4.

Then, serial data A, B, C, and D are shifted by the data latch clock in the shift register 12, and data A, B, and C are output from each Q output terminal.

D is output in parallel format, and these parallel data are input to the electronic shutter drive section 14. Thereby, the electronic shutter of the CCTV camera is controlled according to the parallel data.

In the above embodiment, the transferred data is electronic shutter data, but other data for controlling the CCTV camera can also be transferred via the one-line signal line IO. can.

In this way, when transmitting data such as an electronic shutter, the data and the data latch clock are combined into a serial format, so only one signal line 10 is required, which reduces the number of signal lines and reduces the installation work. In particular, the farther the camera 1 with an electronic shutter is from the monitoring side 6, the greater the effect.

[Effects of the Invention] As explained above, according to the present invention, when displaying an image taken by a CCTV camera with an electronic shutter on a monitor device on the monitoring side, the monitoring side operates the electronic shutter of the CCTV camera, etc. In the method for controlling a CCTV camera with an electronic shutter, the monitoring side converts parallel data of the electronic shutter into serial data, and
A latch clock for the data is generated, the data latch clock and serial data are combined, and this combined signal is transferred to the CCTV camera with electronic shutter in one line, and the receiving side of the CCTV camera with electronic shutter: The data latch clock is separated from the above transfer data, and the serial data is converted to parallel data using the separated data latch clock, making it possible to transfer data such as the electronic shutter using one signal line, so that the monitoring side can It is possible to remotely control the electronic shutter of a CCTV camera, and since only one signal line is required, the line can be easily installed and the installation work can be completed at low cost.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, in which a C
A schematic block diagram of a CCTV system to which the CTV camera control method is applied, Figure 2 shows the above CCTV camera with electronic shutter.
FIG. 3 is a time chart diagram for explaining the operation of the TV camera control method, and is a schematic block diagram of a conventional CCTV camera with an electronic shutter. In the figure, 5 is a setting switch, 6 is a shift register, 7 is a transfer instruction switch, 8 is a control device, 8a is a clock generation section, 8b is a clock counter section, 8c is a control section, 9 is a synthesis section, and 10 is a signal line , 11 is a separation section, 12 is a shift register, 13 is an electronic shutter (CCD shutter), and 14 is an electronic shutter drive section. Patent applicant: Fujitsu General Co., Ltd. Patent attorney: Takuya Ohara

Claims (1)

[Claims] (1) In a method for controlling a CCTV camera with an electronic shutter, the method includes controlling the electronic shutter, etc. of the CCTV camera on the monitoring side when displaying an image taken by the CCTV camera with an electronic shutter on a monitor device on the monitoring side. The monitoring side converts the parallel data such as the electronic shutter into serial data, generates a latch clock for the data, synthesizes the latch clock and the serial data, and sends the synthesized signal to one signal line. The receiving side of the CCTV camera with electronic shutter separates the data latch clock according to the transferred data, and converts the serial data into parallel data using the separated data latch clock. A control method for a CCTV camera with an electronic shutter, characterized in that the data of the electronic shutter, etc. can be transferred in one line.