JPS6161573A - Traffic monitor system - Google Patents

Abstract

PURPOSE:To pick up brightly the image of a data picture by opening a data shutter prior to a field shutter with the aid of an alarm signal. CONSTITUTION:When an automobile against speed rules is detected and an alarm signal 11 is outputted, a data shutter drive signal 19 is outputted, turned on by the vertical synchronizing signal of a television camera 13 and continues the on-state until the next vertical synchronizing signal arrives. Namely, the data shutter comes to be turned on by one frame. Then a field shutter drive signal is turned on to open and close a data shutter. Simultaneously a strobscopic 15 emits light to pick up the image of an automobile, and the image is outputted as an picked-up picture by the next one frame.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a speed measuring device, a T-shirt for photographing data measured by the speed measuring device, and speeding vehicles.
The present invention relates to a traffic monitoring system comprising a V-camera, and particularly relates to an improvement of the TV camera.

[Prior art]

First, this type of system will be explained using an example in which the Doppler effect of radio waves is used as a speed measuring device. Figure 1 is a configuration diagram of a conventional traffic monitoring system. In Figure 0, (1) is the vehicle as the object to be measured, and (2) is the radio wave
) to the vehicle and to receive reflected waves from the vehicle +11; (4) is an antenna that feeds radio waves from a radio wave source such as a Gunn oscillator as a transmission wave to the antenna (2); (2) Difference frequency component between the transmitted wave and the received wave by mixed detection of the received wave and the transmitted wave,
That is, a transmitting/receiving circuit for obtaining the Doppler signal (5), (
6) is a counting circuit for measuring the running speed of the vehicle il+ from the frequency of the Doppler signal (5), and (7) is a counting circuit (6).
) is the output of a speed signal indicating the traveling speed of the vehicle (1), (81 is the speed limit setting switch, (9) is the speed limit output from the speed limit setting switch (8), aIII is the speed signal (7) ) and the speed limit (9), and if the speed signal (7) exceeds the speed limit (91), a comparison circuit outputs an alarm signal αυ, (12 displays the speed signal (7) numerically) +13 is a TV left camera for photographing the vehicle (1) and the data display α2 for displaying the measured speed on the same screen, when the shutter opens and closes in response to the alarm signal αυ. 114 is an X-contact signal that is turned on in synchronization with the opening and closing of the shutter built into the TV left camera 13VC; (Is is a strobe that emits light when the X-contact signal α is turned on, illuminating the vehicle (1));

In addition to the speed signal, the data display α2 can also display related data such as time and speed limit, but here, for convenience, only the speed signal (7) is displayed. , and the spread of radio waves from the antenna (2), that is, the radiation beam, is indicated by diagonal lines in the figure. In such a configuration, the counting circuit (6) is first reset by a reset signal (not shown). vehicle (1) within the radio wave beam from the antenna (2).
When the signal arrives, the reflected wave is received by the antenna (2), and the transmitting/receiving circuit (41) extracts the difference frequency component between the transmitted wave and the received wave, that is, the Doppler signal (5), at a constant sampling rate, and transmits the result to the vehicle ( It is treated as the traveling speed of 1).

The speed signal (71) thus obtained is given to the data display α2 and displayed digitally, and the comparison circuit αa
'rtc is also given, and if the speed limit set by the speed limit setting switch (81) exceeds the speed limit (91), an alarm signal αυ is output and also given to the TV left camera 13. The shutter drive mechanism of the TV camera αJ, such as a solenoid, operates to open and close the shutter. At this time, as the shutter opens and closes, the X contact signal I turns on, and the strobe (l! Provides lighting for photography.

Fig. 2 is a detailed diagram of the TV camera 0 conventionally used in the system of Fig. 1. In Fig. 0, ■ is a field lens for photographing a vehicle.

12υ is the field shutter installed behind the field lens ■, (to) is the data display (data lens for photographing the data in 2), is the data shutter installed behind the data lens ■, and is the prism. The image of the data display device t12 through the data lens port is captured by the image pickup tube (2
) surface, @ is a lens barrel, and the TV camera case @VC is mechanically connected by the mount part @, and the TV camera t1♂ has a field lens (2) and a data lens (4). 2111 prepared! The image of the vehicle (1) is guided onto the image pickup tube surface by the field lens (2) through the optical path II, and the image from the data display +12 is guided through the optical path 101 by the data lens (2)K. The image pickup tube is designed to have an area where the vehicle (1) is imaged by the field lens (2) and an area where the data display device (alpha) is imaged by the data lens (2).

FIG. 3 shows an example of an image captured by this TV left camera 13, which is captured as an image series consisting of a vehicle image (40) and data images (4).

By the way, the field shutter cD is used to capture a still image even when the vehicle (1) is traveling at high speed.

For example, a high-speed shutter of about 1/soo seconds to 1/1G00 seconds is used. Further, the data shutter operates in synchronization with the opening and closing of the field shutter Qυ, but the shutter speed used is as low as, for example, 1/60 second.

By the way, since the vehicle ill is illuminated with a strobe, the image can be captured with sufficient brightness. On the other hand, the data shutter is normally opened and closed following the field shutter e2D. In this case, if the data display is not sufficiently brightly illuminated, the data image may be difficult to read.

[Summary of the invention]

This invention has been made to improve such drawbacks, and the data shutter ■ is opened before the field shutter c2υ by the alarm signal OD,
The present invention provides a traffic monitoring system that captures data images as brightly as vehicle images.

[Embodiments of the invention]

FIG. 4 is a block diagram of one embodiment of the traffic monitoring system according to the present invention. In FIG. , there is one screen, or one frame, between one vertical synchronization signal and the next vertical synchronization signal,
The fin is set by the shutter controller, and from the vertical synchronization signal and the alarm signal +lυ.

A field shutter drive signal α♂ and a data shutter drive signal α9 are generated. Note that (1) to (I!9) have the same or equivalent functions as the same reference numerals in FIG.

FIG. 5 is a waveform diagram illustrating the operation of the shutter controller (Iη), which is a field shutter drive signal α seconds.

In such a configuration, when a speeding vehicle is detected and a warning signal αυ is output, the data shutter drive signal al is first output as shown in the waveform diagram of FIG. This data shutter drive signal is turned on by the vertical synchronization signal of the TV camera α3 and remains on until the next vertical synchronization signal arrives. That is, the data shutter is on for one frame. Next, field shutter drive signal αe
is turned on, the field shutter is opened and closed, and at the same time, the strobe α9 emits light and images the vehicle (1).

The image captured in this manner is output as a captured image in the next frame. By the way, in this case.

The data shutter is open for 17 nm, which is long enough compared to the time that the field shutter c2Il is open.
The image will be brightly captured even if the data display device α2 is not strongly illuminated.

〔Effect of the invention〕

In this way, when a speeding vehicle and its related data are displayed on the same screen, a clear image can be taken without strong illumination of the data display fi3.

In addition, in the example, the case where the Doppler effect of radio waves was used as a speed measuring device was shown as an example, but as a speed measuring device,
There are various other methods such as using a tape switch. Further, in the embodiment, an example was given of photographing a speeding vehicle, but it goes without saying that this TV camera can also be used for process monitoring in a factory.

Further, in the embodiment, the data shutter is opened from one vertical synchronizing signal to the next vertical synchronizing signal.

It goes without saying that if the data shutter is opened in conjunction with the field shutter, the opening time may be changed within the range that allows the data display to be brightly imaged.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional traffic monitoring system, and Figure 2 is a T
FIG. 3 is a block diagram of the V camera, FIG. 3 is a diagram showing captured images, FIG. 4 is a block diagram of an embodiment of the traffic monitoring system according to the present invention, and FIG. 5 is a diagram showing waveforms. In the figure, (1) is a vehicle, (2) is an antenna, (4) is a transmitting/receiving circuit, (6) is a counting circuit, and (8) is a speed limit setting switch. αO is a comparison circuit, α2 is a data display, housing 3 is a TV camera, α9 is a strobe, and fin is a shutter controller. In addition, the same or corresponding parts in Figure 9 are indicated with the same reference numerals.

Claims (1)

[Claims] A photographing device that photographs a speeding vehicle together with a data display that displays data related to speeding, and a photographing device that measures the traveling speed of a traveling vehicle, and if the traveling speed exceeds a preset speed, the vehicle is deemed to be a speeding vehicle. The speed measuring device is configured to generate an alarm signal when the vehicle is running, and a strobe light for illuminating the traveling vehicle.The speed measuring device measures the speed of the traveling vehicle and converts the measured value into the data. In addition to displaying the data on the display, if the actual measured speed exceeds a preset speed, a warning signal is output, and the photographing device detects the speeding vehicle and the data display under the flash of the strobe. In a traffic monitoring system configured to take pictures on the same screen, the photographing device is a TV camera equipped with a twin-lens optical system consisting of a field lens and a data lens each having a shutter, and a shutter for the field lens. and the shutter for the data lens are controlled by the vertical synchronization signal of the TV camera,
A traffic monitoring system further comprising: a shutter controller that operates to open the shutter for the data lens earlier than the shutter for the field lens.