JPS63184900A - Vehicle detector - 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 vehicle detection device that is installed in a tunnel and collects information on the passage of vehicles.

BACKGROUND ART FIG. 3 shows the configuration of a conventional vehicle detection device. Third
In the figure, reference numeral 1 denotes a television camera, which is connected to an A/D converter 2, binarized into rOJ and rlJ, and then stored in a binary image memory section 21. Reference numeral 22 indicates a coordinate interval detection section for tail lamps, 23 indicates a tail lamp interval setting section, and 24 indicates a comparison determination section.

Next, the operation of the above conventional example will be explained. In FIG. 3, an image including a vehicle is binarized through a television camera 1 and an A/D converter 2, and is stored in a binary image memory 21. The tail lamp coordinate interval detection unit 22 determines the coordinates of binary data "1".

The comparison determination unit 24 compares the results of the tail lamp interval setting unit 23 and the tail lamp coordinate interval detection unit 22, and determines that the vehicle is a vehicle when one condition is satisfied. In this way, the conventional vehicle detection device described above can also detect a vehicle.

Problems to be Solved by the Invention However, the conventional vehicle detection device described above uniformly binarizes the image, so if the threshold value takes an intermediate value between the left and right tail lamps, the binary data "1" There was a problem in that the vehicle could not be detected because the distance between the two was not determined.

The present invention solves these conventional problems,
It is an object of the present invention to provide an excellent vehicle detection device that can detect vehicles with high accuracy.

Means for Solving the Problems In order to achieve the above object, the present invention comprises a multilevel image memory, a vertical projection section, a binarization threshold determining section for a projection sum value, a projection binarization circuit, and a projection binarization circuit. A counter section for the number of consecutive value data "1" and a vehicle determination condition setting section are provided to detect the tail lamp of a vehicle with high accuracy.

Therefore, according to the present invention, the tail lamps can be extracted by making the binarization threshold for each of the left and right tail lamps variable using multivalued data, and the interval and size of the tail lamps can be adjusted according to the vehicle. Vehicles can be detected with high accuracy by comparing with the determination conditions.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, %l is a television camera, 2 is an A/D converter, 11 is a multivalued image memory, 12 is a vertical projection unit, 1
3 is a threshold value determination circuit A for detecting the maximum value of the tail lamp in area A; 14 is a maximum value detection circuit for the tail lamp in area B;
Threshold determination circuit B, 15 is a binarization circuit of the vertical projection section, 16 is a coordinate detection/continuation number counter section, 17 is a vehicle judgment condition setting section, and 18 is a comparison judgment section.

Figure 2 shows the main parts of each signal in this example, where False) is the vehicle detection area, Φ) is the vertical projection and binarization threshold, and C1 is the coordinates of binary data "1". It is a continuous number.

Next, the operation of the above embodiment will be explained. The image captured by the television camera 1 is A/D converted into multi-value data by the A/D converter 2, and is stored in the multi-value image memo +J11. The vertical projection unit 12 vertically adds the multilevel luminance data of the vehicle detection area.The vehicle detection area is formed from the left tail lamp area A and the right tail lamp area B as shown in FIG. 2(a). configured. Figure 2 shows the vertical projection additional charges when the left and right tail lamps have different brightness. Maximum value detection/threshold determination circuit + IH3
Then, the maximum value of the vertical projection addition fee to the area is detected, and the binarization threshold THI of the area A is determined based on the maximum value. Similarly, the maximum value detection/threshold determination circuit B14 detects the maximum value of the vertical projection additional charge for area B, and determines the threshold value T142 for area B based on the maximum value. FIG. 2(b) shows the threshold values Tl-11 and TH2 for each region.

In the projection binarization circuit 15, the vertical projection additional charge is determined by the threshold values of the maximum value detection/threshold determination circuit A13 and the maximum value detection/threshold detection circuit 1314.
Binarize into lj. The situation is shown in FIG. 2(C). In the coordinate detection/consecutive number counter section 16, binary data "1"
coordinates x1. x2 is detected and the consecutive number of binary data “1” Δ
Count x1°Δx2. This situation is shown in Figure 2 (C).
Shown in The vehicle determination condition setting unit 17 determines the interval range xi±α between the left and right tail lamps and the inside tank range Δ of the tail lamps.
χ±β is set, and the comparison/judgment section 18 compares the outputs of the coordinate detection consecutive fist number counter section 16.

When the conditions are satisfied, it is determined to be a vehicle.

In the above operation explanation example, explanation was given for one tail lamp on one side, but the coordinates are detected and the number of consecutive tail lamps is counted in the same way for two or three tail lamps on one side.

The comparison/judgment unit 18 compares all combinations of the obtained coordinates with set conditions to determine the vehicle.

As described above, according to the above embodiment, the maximum value detection/threshold determination circuit A13. (By providing 2114, the threshold values for detecting the left and right tail lamps can be made variable, making it possible to detect the tail lamps with high accuracy and determine the vehicle even if the brightness of the left and right tail lamps is significantly different. It has this effect.

Effects of the Invention As is clear from the above embodiments, the present invention has the following effects.

(1) By determining the threshold values for left and right tail lamp detection separately, the tail lamps can be detected even if the brightness of the left and right tail lamps is significantly different.

(2) Since the threshold value is determined from the brightness data of the tail lamp using multivalued data, the tail lamp can be detected even if the brightness of the entire image changes.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a vehicle detection device according to an embodiment of the present invention, FIG. 2 is a signal state diagram of the same device, and FIG. 3 is a schematic block diagram of a conventional vehicle detection device. 1...TV camera, 2...A/l) conversion unit, 1
1... Multivalued image memory, 12... Vertical direction projection unit,
13... Maximum value detection/threshold determination circuit A, 14
...Maximum value detection/threshold determination circuit B, 15...
Projection binarization circuit, 16... Coordinate detection/consecutive number counter section, 17... Vehicle judgment condition setting section, 18... Comparison judgment section, 21... Binary image memory, 22... Coordinates Interval detection section, 23...Tail lamp interval setting section, 24...
・Comparison and judgment section. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3

Claims (1)

[Claims] A multivalued image memory that stores an image including the tail lamp of a vehicle in a tunnel, a vertical projection unit that vertically projects and adds the brightness values of a vehicle detection area in this multivalued image memory, and a projection area that is divided into two. A maximum value detection and threshold determination circuit that detects the maximum value of the projection sum value of each part and determines the binarization threshold of the projection sum value, and the threshold value determines "0",
A binarization circuit that binarizes this binary data to “1” and
A coordinate detection/consecutive number counter unit that calculates the coordinates and continuous width of “1” and a vehicle judgment condition setting unit are provided, and the coordinates and continuous number of binary data “1” are compared with the vehicle judgment condition, and when the conditions are met, , a vehicle detection device configured to determine that the vehicle is a vehicle.