JPH0415520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a traffic control system for grasping the traffic situation on a motorway.

[Technical background of the invention and its problems]

Conventionally, systems for understanding the traffic conditions on expressways (congestion, congestion, free flow) have been based on installing vehicle detectors at arbitrary points on the road and connecting these detectors to a central processing unit. There are some configurations. This type of system detects occupancy and
Alternatively, a pulse containing a velocity component is obtained and sent to a central processing unit. The central processing unit receives the detection signal from the sensor and processes it for a certain period of time (for example, 1
The number and components of the input pulses were counted in units of minutes, 5 minutes, etc., and the traffic volume, speed, occupancy, etc. were determined at each sensor installation point at regular intervals. Furthermore, the central processing unit calculates the density from the correlation curve of traffic volume density based on the traffic volume of each point or the average traffic volume of the points included in each section of the road, and calculates the density based on the density value. Assessing traffic conditions. Therefore, the density determined is based on the traffic volume over the past few minutes, so there is a time delay, and the density is created based on the discrete traffic volume at the location where the sensor is installed. Since the density obtained is only a representative value, there is a drawback that there is a discrepancy between the traffic situation judgment result calculated by the central processing unit and the actual traffic situation.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a traffic control system that can judge traffic conditions with high accuracy without time delay.

[Summary of the invention]

In the present invention, a road to be determined in a traffic control target area has a road surface structure that absorbs only a specific wavelength of light. A camera attached to a geostationary satellite will photograph a certain area, including each road, and transmit the image data to a ground station. The ground station sends the received image data to a data processing device for traffic control, and the data processing device extracts the road to be judged from the image, performs spectrum analysis using Fourier transform, and calculates the value of the spectrum of a specific wavelength. Based on this data, the vehicle density for each section is determined, and predetermined traffic information is obtained. This traffic information is then displayed on an external traffic information board. In this way, by obtaining traffic information for any section, the vehicle density value does not include past components, so there is no time delay, and the vehicle density can be calculated as a continuous value, so it can be calculated with high accuracy. You can get traffic information.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 100 is a road subject to traffic control (hereinafter referred to as a road subject to judgment), which has a road surface structure that absorbs a specific wavelength of light.
02 has a road surface structure that absorbs different wavelengths of light. Reference numeral 110 denotes a geostationary satellite having a camera and an image transmission mechanism that photographs a certain area on the ground surface including the road 100 to be determined at a certain period (for example, every 5 minutes) and transmits it to the ground as a video signal. be. 120 is a ground antenna for communicating with the geostationary satellite 110. 130 is a remote ground station that controls the attitude of the geostationary satellite 110, corrects the video signal received by the ground antenna 120, obtains digital image information, and transmits this to a traffic control data processing device to be described later. It is. 140 receives image information from the remote ground station 130, extracts a target road from the image, performs spectrum analysis using Fourier transform,
By calculating the value of the spectrum of a specific wavelength for each section, the density of vehicles on a section road is determined, and the traffic situation is determined. Based on the results of the judgment of the traffic situation for each section, predetermined traffic information (for example, "○○ This is a data processing device for traffic control that creates and outputs display information such as "-XX section traffic congestion △Km". Reference numeral 150 denotes a traffic information board having a lamp matrix configuration, which is installed on the road and receives traffic information output from the data processing device 140 and enlarges and displays it. 160 and 17
0 is a display device connected to the data processing device 140, which is installed in the traffic control room x, 160 is a display device (CRT monitor) that displays traffic conditions, congestion information, etc.; This is a graphic panel that displays a map. 1
80 is installed in the car y, and receives traffic information processed by the data processing device 140 via radio waves;
This is an on-vehicle device that notifies the driver through a display device or audio output device.

Here, the operation of one embodiment will be explained. Images of a certain area including the road 100 to be determined are sent to the geostationary satellite 11 at an appropriate interval for traffic control (for example, 1 minute, 5 minutes, etc.)
A camera attached to the ground antenna 120 takes a picture and transmits the image as a video signal to the ground antenna 120.
Video signals received at ground antenna 120 are sent to remote ground station 130. The remote ground station 130 corrects the image based on the position of the geostationary satellite 110, etc.
Digitized image information is obtained and transmitted to data processing device 140. Data processing device 1
40 receives the image information, processes it into a pattern, subdivides the image into a matrix, and selects the target road 1 according to the coordinates from the origin of the image.
A subsection corresponding to a portion of 00 is extracted, subjected to Fourier transformation, and subjected to spectrum analysis. here,
As described above, the road 100 to be determined has a road surface structure that absorbs a specific wavelength of light.
If vehicles are present, the reflectance of a specific light wavelength will change depending on the density of vehicles. Therefore, the density of vehicles is determined by the correlation coefficient with the reflectance when no vehicles are present. Thereby, the presence density of vehicles can be obtained in subdivision units based on the correlation coefficient from the value of the spectrum of the spectrally analyzed specific wavelength. The vehicle density at a point on a road corresponds to the vehicle density in a subdivision, and the vehicle density in a road section can be calculated from the average of the vehicle densities in several consecutive subdivisions. The vehicle density value of this point or section is compared with the predetermined vehicle density value of congested, congested, or free flow to determine whether the vehicle is congested, congested, or free flow.
Furthermore, based on the determination results for this point and section, traffic congestion information (○○-XX section traffic congestion △Km) is created.
Then, the display device 160 outputs vehicle densities at points and sections, traffic condition determination results, congestion information, etc. for traffic condition monitoring, and the traffic condition determination results are output to the graphic panel 170. Further, the data processing device 140 transmits traffic congestion information to the traffic information panel 150 and the on-vehicle device 180. The traffic information board 150 selectively drives lamps arranged in a matrix based on the received information, and displays and outputs information such as [○○-XX section traffic congestion ΔKm].

By the processing means as described above, the geostationary satellite 11
Since the vehicle density taken from time to time by the camera attached to the camera 0 can be obtained for the entire judgment target road 100, the value of the vehicle density does not include past components and therefore there is no time delay. Furthermore, since the vehicle density can be calculated as a continuous value and the vehicle density is directly determined rather than converted from the traffic volume, highly accurate traffic information can be obtained. Furthermore, there is no need to install a large number of sensors on the road, making maintenance and management on the road easier.

〔Effect of the invention〕

As described in detail above, according to the traffic control system of the present invention, it is possible to notify the traffic situation with high accuracy without time delay, thereby providing highly reliable traffic situation guidance.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 100... Road to be determined, 110... Geostationary satellite, 120... Ground antenna, 130... Remote ground station, 140... Data processing device, 150... Traffic information board, 160... Display device, 170
...Graphic panel, 180...Onboard equipment, x
...Traffic control room, y...Car.

Claims (1)

[Scope of Claims] 1. A data processing device for traffic control that inputs and processes image information taken from the air via a ground receiving station, and a data processing device on a road that displays traffic conditions according to the information obtained from the processing device. A traffic control system equipped with a display panel installed at means for inputting image information input via a receiving station on the ground; means for patterning and processing the image information input via the receiving station; A means for extracting a target road, and a method for spectral analysis of the image of the target road extracted by the same means using Fourier transform, calculating the value of the spectrum of a specific wavelength for each section, and based on the result of the section determination, A traffic control system comprising: means for obtaining predetermined traffic information according to traffic conditions; and means for transmitting the traffic information obtained by the means to a display panel installed on the road.