JPS6027997A - Traffic flow measuring apparatus - 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 Field of the Invention The present invention relates to a traffic flow measuring device that measures and monitors traffic flow by processing video signals obtained from a television camera.

Conventional configurations and their problems Conventionally, when measuring traffic flow by processing video signals obtained from television cameras, the video signals were processed digitally, which required a large amount of memory and the equipment became very expensive. It had become expensive.

OBJECTS OF THE INVENTION The present invention aims to eliminate the above-mentioned conventional drawbacks and provide an inexpensive and highly reliable traffic flow measuring device by combining differential processing and analog processing.

Structure of the Invention In order to achieve the above object, the present invention installs a television camera on the road or on the side so that a vehicle is imaged, binarizes the imaged video signal with a certain threshold value, and converts the imaged video signal into a binary value. 2
One signal is input to the frame memory and one frame is stored in memory, and the other signal and the signal stored in the frame memory are subtracted with a time difference to create a difference image. Extracts a moving vehicle from the screen, detects when a moving vehicle passes through multiple detection areas set at arbitrary positions on the screen, and calculates this by considering specifications such as camera pickup position and angle. Obtaining traffic flow information (traffic volume, speed, density, etc.) by 5. DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to Figure mj.

FIG. 1d: This is an explanatory diagram that does not show an installation example in which a television camera is installed on the side of the road. FIG. 2 is a block diagram of an embodiment of the present invention, and FIGS. 3(a) to 3(d) are explanatory diagrams of video patterns in the h processing process. .

In FIG. 2, a signal from a television camera 1 undergoes seven corrections for distortion and the like in the transmission system in a preprocessor 2. As a result of the processing Bp in the preprocessing section 2, an image 14 as shown in FIG. 3fa) is produced. Next, in order to obtain the synchronization signal necessary to control this output, it is input to the synchronization separation section 3, the synchronization signal A is extracted, and the extracted synchronization signal is converted into a control signal port by the control section 4. .

On the other hand, the video signal output from the synchronization separation section 3 is divided into two by the video distribution section 5. One output signal is input to a monitor television 6, and traffic is monitored manually. The other output is manually input to the binarization section 7 and binarized using a certain threshold value or an automatically controlled threshold value. FIG. 3(b) shows this situation. This binarized signal H is divided into two parts by a distribution control section 8, and one signal is directly inputted to a 1 subtraction section 9 while being controlled by a control signal port. The other distributed signal l is input to the frame memory 10, where one frame is stored in memory, and the signal l is controlled by a control signal port and outputs a signal with a slight time difference. This output ``chi'' is input to the subtraction unit 9, and by subtracting the signals from ``chi'' and ``chi'', a difference image is generated, all non-moving objects disappear from the screen, and only moving objects are extracted. This situation is not shown in No. 31z1 (C).

Next, the output of the 7p unit 9 is input to the setting unit 11 of a plurality of detection areas 15 provided at arbitrary positions on the screen as shown in FIG. rf: Determine presence or absence in a sieve 1 manner, and input the result to the calculation processing section 12 4, here, the detection area setting section 11
The signal is better than the camera's mounting position.

14. Considering the specifications such as the mounting angle and the time signal stored in the frame memory 10. J: L, traffic volume, speed, density pigeon are played 3, and based on these results, the contents stored in the frame memory 10 are outputted, and when the Shinzuki O is to be output, the performance 1 is The results are output to the display unit 13. .

Effects of the Invention As is clear from the above explanation (-(According to the present invention, by combining dental processing and one-analog processing, a traffic flow measuring device with a small amount of memory and high reliability (jl) can be obtained. There is a certain value to this practical soil.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example in which a television camera is installed on the side of the road, Fig. 2 is a block diagram of a traffic flow measuring device according to an embodiment of the present invention, and Fig. 3 (, j to (d) are the same). It is a diagram showing video patterns in each process of signal processing of the device. 1. Television camera, 2. Preprocessing section, 3. Synchronization separation section, 4. Control section, 6. Video distribution. Part, 6
・・Monitor TV, 7・・Binarization section, 8・・
Distribution control unit, 9... Subtraction unit, 10 Frame memory, 11... Detection area setting unit, 12... Arithmetic processing unit, 13... Display unit.

Claims (1)

[Claims] A television camera installed on the road or on the side thereof so that a vehicle is imaged, and a video signal imaged by the television camera is binarized using a certain threshold value. After inputting the output signals of the digitizing section and the binarizing section to a frame memory and giving a time difference to the output signal of the binarizing section, the output signals of the binarizing section are input to the frame memory. Nodekai f
a subtraction unit that extracts a traveling vehicle portion from a television image by subtracting No. TV camera installation position. A traffic flow measuring device comprising: an arithmetic processing unit that calculates the time difference between trips set in the frame memory and obtains traffic flow information such as traffic volume, vehicle speed, and vehicle density.