JPS6054099A - Traffic monitoring system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This sound is related to a traffic monitoring system.
Photographed as a still image using a camera.

The present invention also relates to a system that transmits data such as speed related to driving conditions and the above-mentioned still image as a set of data.

[Prior art]

Recently, it has become common practice to monitor traffic conditions by installing TV cameras on roadsides, etc., taking pictures of vehicle driving conditions, and transmitting the images to monitoring stations. became.

In such cases, a method is generally used in which data relating to the driving condition of the vehicle, such as driving speed, driving location, etc., is synthesized and transmitted at the stage of the photographed image and the RV video signal. Also, as a method of accumulating such image data,
A method is used in which the transmitted image data is recorded on a VTR or the like. In this case, if you try to search for images using the above data related to driving conditions as a key, it is necessary to sequentially play back the recorded images and visually read the above data on a monitor TV, etc., which requires a lot of time and effort. There was no easy way to do so.

[Summary of the invention]

The present invention was made to solve these problems and provides a traffic monitoring system equipped with a simple two-image search means. The speed monitoring of a running vehicle will be explained below with reference to the drawings as an example.

[Embodiments of the invention]

FIG. 1 is a system configuration diagram of an embodiment of the present invention.
(1) is a vehicle as a subject, Ta2 is a first tape switch, Ta2 is a second tape switch, and the first tape switch T81 and the second tape switch T82 are each installed at a predetermined interval R on the road. has been done. (2)
is a counter that calculates the speed of the vehicle from the time from turning on the first tape switch T81 to turning on the second tape switch T82 and the set interval R of the tape switch, and (3) is the speed that is the output of the counter (2). Data (4) is a speed limit setting switch and outputs speed limit data (5). (6) is speed limit data (5) and speed data (3)
A comparator that compares the speed data (3) with the speed limit data (5) and outputs a shooting command (7). Speed measuring device M consisting of switch T82, counter (2) and 111] speed limit setting switch (4) and comparator (6), +91 is lens θl and shutter 0I
041 is an 'r v camera (9
) video signal, α9 is the synchronization signal of the TV camera (9),
QQ is an A/I) converter that quantizes the level of the video signal and converts it into digital data for each pixel, Q7+
A/I) an image memory that stores the output of the converter;
0 (to) is a memory controller that generates a write command to image memo 1JQ71 based on synchronization signal Q9, c21 is a data memory that stores speed data (3), Qυ is a data switch, and si4 is data It is a data transmitter that is controlled by the switch +211 and sequentially extracts data from the data memory 1 and the image memory (1?+) and sends it out as a serial signal.The field of view taken by the lens OI of the TV camera (9) is
and a second tape switch T81. The speed measurement device (8) is set near I'82 and is measured by a speed measuring device (8), which is arranged to take pictures of the vehicle.

In such a configuration, when the vehicle 10 approaches, the first tape switch TS is first activated by the wheels of the vehicle (1).
1 is pressed and turned on, and then the tape switch T82 of 82 is stepped on and turned on. The one hour interval between turning on these two tape switches T81 and Ta2 is determined by the speed of the vehicle and the set interval.The counter (2) measures the time interval at which these two tape switches are turned on, and calculates the set interval, which is a known quantity, from the speed of the vehicle fil. Calculate data (3).

On the other hand, the comparator (6) compares the speed data (3) with the speed limit data (5), and if the speed data (3) exceeds the speed limit data (5), the vehicle (1)
It outputs a photographing command (7) as an overspeeding vehicle and drives the shutter (111) of the TV camera (9) to photograph the vehicle (1). The reason for this is to photograph the vehicle file as a still image.

By projecting the 41jl shadow as a still image, it is possible to obtain a clear image of vehicle 0) with less blur.

The image photographed in this way is outputted as an analog signal from the drive circuit 13 as a video signal a4, digitized pixel by pixel by an A/D converter (IQ), and guided to and stored in an image memory 0η. 3
) is led to and stored in the data memory (a). Furthermore, the storage in the image memory 0η will be explained in detail. To make the explanation easier to understand, an example will be explained in which the number of horizontal scanning lines of the 1゛v camera (9) is 500. FIG. 2 is an explanatory diagram of the image memo IJ (17).

One screen is 500 horizontally x 500 vertically = 250,000
Each pixel is divided into 8 pixels, each having 8-pit gradation.

That is, after the vertical synchronizing signal of synchronizing signal α4 is output, each horizontal scan is divided into 500 pixels in synchronization with the horizontal synchronizing signal, and each pixel is sequentially converted into an 8-bit digital quantity according to the level of the video signal I. As a result, h/n−+mber a
From e, the signals are sequentially output in the direction of arrow A as shown in FIG. On the other hand, the memory controller (for 1U, synchronization signal Q9tf
Based on this, a write command is generated and one screen of images is stored in the image memory 0η as shown in FIG. Also data memory■
is configured to have an area for one horizontal scanning line, ie, 500 pixels, as shown in FIG. 2, and stores speed data (3), etc. In this way, image data for one screen is stored in the image memo IJQ71, and related data such as speed data related thereto is stored in the data memo January Fuchi. The data thus accumulated is transmitted by the data transmitter t23, and this data transmission will be explained in more detail.

FIG. 3 is a detailed explanatory diagram of the memory, and FIG. 3 shows a Cal data memory, and FIG. 3 (bl is a diagram showing an image memory).

In the figure, aη is an image memory as in FIG.

(A) is a data memory and an image memory. The image memory θη is a memory area M corresponding to one horizontal scanning line.
It is divided into memory areas M2 corresponding to the 1st and 2nd grains to the 500th horizontal scanning line. At the start of data transmission, the data switch at+ first sends the contents of the data memory CD to the data transmitter cl, and the data transmitter Q4 transmits the contents as a serial signal. Data memo IJ (When the transmission of 211 is completed, the data switch 011 transfers the image memo IJ
(The memory area M2 of 171 is sequentially sent to the data transmitter Q2, and the data transmitter Q transmits this as a serial signal.

As a result, data memory (A) is sent from data transmitter I2.
From 500 pieces x 8 pits, image memory, from Mori aη 4
Data of 99 pieces x soo pieces x 8 bits is transmitted, and data of 500 pieces x 500 pieces x 8 bits is transmitted in total.

〔Effect of the invention〕

As described above, this invention allows one horizontal scanning line of related data to be inserted into the TV screen data by collectively transmitting the data as part of the image, and also allows the data to be output from the data transmitter Q side. Since the capacity is the same as that of one conventional 'RV screen, data handling becomes easy. As a result, the image and related data can be handled as one image data. Since the related data can be inserted into the image data as a digital amount in this way, it becomes possible to easily file and search one image using the related data as a key.

In addition, in the embodiment, speed data (only 31 was given as an example) as related data, but other data such as speed limit photographing date, hour and minute, location data, etc. are also possible.In addition, in the embodiment, data memory C1 and image memory aη Although shown separately, it is not necessary to separate them.Also, although the related data is transmitted for one horizontal scanning line of the TV camera, it may be more or less than this.Also, in the embodiment, it is used as a speed measuring device. Although the case where a tape switch is used is shown, other means such as the Doppler effect of 2% waves are also available.

Further, in the embodiment, although the example of monitoring the running speed of a vehicle was given, the present invention can also be applied to monitoring the distance between vehicles, etc.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of this output 1jlJ, Fig. 2 is a block diagram of an image memory, and Fig. 3 is a detailed explanatory diagram of the memory. Measuring device. (9) is q゛v camera, Q[9 is A/D: ff
7 barter, aη is image memory, 0 樟 is memory controller,
CJI is data memory. Cl11 is a data switch, and (c) is a data transmitter. In the figure, the same or corresponding parts are given the same reference numerals. Agent Masuo Oiwa

Claims (1)

[Claims] In a traffic monitoring system that is installed on the road or on the side of the road and monitors vehicles traveling on the road by photographing them from an RV right camera, data regarding the driving conditions such as the speed of the vehicle and images taken by the TV camera are provided. A vehicle running condition measuring means that outputs a command signal, a shutter that turns on and off the shooting operation of the TV camera, and an A/D that converts the video signal of the TV camera from analog to digital for each pixel.
a converter, a memory controller operated by the horizontal and vertical synchronization signals of the TV camera and the photographing command signal, a data memory that stores data regarding the driving situation, and the image of one screen of the TV camera. /
an image memory that stores data based on the output of the D converter; a data switch that sequentially retrieves the data of the image memory by replacing a part of the image memory with data related to driving conditions accumulated in the data memory; and a data switch that sequentially retrieves data from the image memory; A traffic monitoring system with a data transmitter that transmits as a serial signal.