JP2962290B2 - Automatic monitoring device in tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic monitoring device in a tunnel, and more particularly to an automatic monitoring device in a tunnel for automatically determining a lighting mode in a tunnel.

[0002]

2. Description of the Related Art As a prior art related to the present invention, there is JP-A-5-620942. The content is a vehicle dynamics measuring device in a tunnel including an image pickup device installed inside the tunnel and an image processing device for processing image data sent from the image pickup device. There are provided input means for inputting a light / dark signal for adjusting the brightness, and adjusting means for adjusting the image pickup means or the image processing means according to the light / dark signal.

As an adjusting means, an "aperture" of an imaging means is used.
Or means for adjusting the “A / D conversion level”, “threshold”, or “background data used for image processing” of the image processing means.

In an image processing apparatus for extracting a vehicle, a falling object, etc. from image data transmitted by an image pickup means installed in a tunnel, an external light / dark signal is input in accordance with an illumination mode of lighting equipment in the tunnel and prepared in advance. A method of obtaining a difference from the background image obtained is used. However, in order to reduce the difference in brightness between the outside and the outside, the lighting mode is changed to all lights, 1/2 light, etc. by a light / dark signal from a central device installed far away. At the time when the illumination mode is switched, the difference from the background image prepared in advance also changes, which may cause an error in the detected data. Conventionally, a light / dark signal from a central device is input to an image processing device, and a background image is adjusted accordingly.

[0005]

To determine the illumination mode in the tunnel in the related art, an adjusting means for adjusting the imaging means or the image processing means in accordance with a light / dark signal from the central device is provided. Or means for adjusting the "A / D conversion level", "threshold" or "background data used for image processing" of the image processing means. Therefore, a device for exchanging signals with both the central device and the image processing device was required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic monitoring device in a tunnel that automatically determines a lighting mode without receiving a lighting mode signal from a remotely located central device.

[0007]

SUMMARY OF THE INVENTION An automatic monitoring device in a tunnel according to the present invention includes an image pickup device provided inside a tunnel, and an image processing device for processing image data sent from the image pickup device. In the automatic monitoring device in the tunnel to determine, a determination exclusion means for excluding from the determination of the illumination mode in the tunnel when the vehicle in the monitoring target area passes,
The illumination mode is determined by comparing the image data sent by the imaging unit with a partial area of the background image corresponding to each illumination mode collected in advance, and selecting the background image with the smallest difference. It is characterized by having determining means.

The background image photographed in advance is a background image photographed by the image pickup means installed in the tunnel when the vehicle does not pass, corresponding to the type of the illumination mode in the tunnel. Image comparison is performed not on the entire screen but on an arbitrary area of the screen, and there is a speed-up means for speeding up the image comparison.

The speed-up means calculates the average level of the video signal for an arbitrary area of the background image in each illumination mode, and calculates the average level of the video signal for the area of the image data transmitted by the imaging means. And a speed-up means for selecting a background image having the smallest difference.

The comparing means compares the amount of change in the clarity of the entire screen due to the exhaust gas in the tunnel with a video signal of a background image corresponding to each lighting mode which has been collected in advance.
There is a calculating means for calculating the DC component, and a comparing means for subtracting the calculated DC component as a compensation value, and sequentially comparing the image data sent out by the imaging means with the background image corresponding to each illumination mode previously collected.

Further, the discrimination exclusion means compares the image data transmitted by the imaging means transmitted when the vehicle passes with the background image corresponding to the illumination mode taken in advance, and determines the non-similar shape of the video signal pattern. And a discrimination exclusion means for not discriminating the illumination mode when the vehicle passes by the detection signal of the detection means.

According to the present invention, the comparison is made not in the entire screen but in an arbitrary area of the screen in order to process the image data sent by the imaging means and the background image corresponding to the illumination mode collected in advance at high speed. . Also, in consideration of the fact that the clarity of the entire screen changes due to the exhaust gas in the tunnel and the like, the values obtained by subtracting the DC components are compared. Furthermore, the present invention is characterized in that comparison and determination are not performed when the vehicle passes so that the vehicle is not affected by the passing. .

Therefore, by performing image processing on the input image data, it is possible to obtain an automatic monitoring apparatus in a tunnel that determines the lighting mode without requiring a special signal input.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an automatic monitoring apparatus in a tunnel according to the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, according to an embodiment of the present invention, an ITV camera 1 installed at a position overlooking a road in a tunnel to capture a trend of a vehicle, and an ITV camera 1
A device main body 2 for determining the trend of the vehicle from the image of
And a storage device 3 for storing information. The main body 2 is an A / D converter 21 for converting a video analog signal into digital data.
And an image memory 22 for storing digital data and background data of a photographed image, and an image processing unit 23 for processing the image data. The storage device 3 has a background image in each lighting mode.

The storage device 3 stores all lights, 1/2 of the object to be monitored in the tunnel through which the vehicle has not passed.
A background image of each lighting mode such as a lamp and a quarter lamp is held. The A / D converter 21 converts a video analog signal of an image captured by the ITV camera 1 into digital data and transfers the digital data to the image memory 22. The image memory 22 stores digital data for one frame of an image captured at regular time intervals and a background image in the lighting mode at that time.
The image processing unit 23 captures the digital data and the background data stored in the image memory 22 and performs a task of extracting a vehicle from the difference between the digital data and the background data and a process of checking a change in the lighting mode.

Next, a description will be given of the operation of determining the lighting mode of the automatic monitoring apparatus in a tunnel according to the present invention with reference to FIGS.

A background image read from the storage device 3 is recorded in the video memory 22. A video analog signal of an image captured by the ITV camera 1 is output to an A / D converter 21.
Are converted to digital data and transferred to the image memory 22. The image memory 22 stores one frame of input data of a screen captured at regular time intervals. Step 1: The image processing section 23 fetches the input data and the background data stored in the image memory 22, and Step 2: checks whether or not a vehicle exists from the difference between them. Step 3: When there is no vehicle, an average value of luminance values in an arbitrary region of the image is obtained, and an image is created by subtracting the average value from each point in the region. Similarly, with respect to the background images of each lighting mode such as all lights, 灯 lights, 記録 lights, and the like recorded in the storage device 3, the average value of the luminance values of the same area is obtained, and each point in the area is obtained. An image is created by subtracting the average value from. Step 4: Obtain the absolute value of the difference between the input image and each point of the image obtained in step 3 of the background image of each lighting mode such as all lights, 1/2 light, 1/4 light, etc., and obtain the sum thereof. . Step 5: The sum in each lighting mode calculated in step 4 is compared, and the lighting mode having the smallest value is determined. Step 6: The background image of the illumination mode determined in step 5 is transferred from the storage device 3 to the video memory 22.

[0019]

When the lighting mode in the tunnel changes,
An automatic monitoring device in a tunnel that determines a lighting mode without receiving a signal from a central device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ITV camera 2 Device main body 3 Storage device 21 A / D conversion part 22 Image memory 23 Image processing part

Claims (6)

(57) [Claims] 1. An automatic monitoring device in a tunnel, comprising: an image pickup device installed in a tunnel; and an image processing device for processing image data sent from the image pickup device, wherein the automatic monitoring device in the tunnel determines a lighting mode in the tunnel. A determination exclusion unit that excludes a vehicle passing from the determination of the illumination mode in the tunnel; a comparison unit that sequentially compares the image data transmitted by the imaging unit and a partial region of a background image corresponding to each illumination mode collected in advance. An automatic monitoring device in a tunnel, comprising: a determination unit configured to determine a lighting mode by selecting a background image having the smallest difference. 2. The tunnel image according to claim 1, wherein the background image photographed in advance is a background image photographed by an image pickup means installed in the tunnel when the vehicle does not pass, corresponding to the type of the illumination mode in the tunnel. Automatic monitoring device. 3. The automatic monitoring apparatus in a tunnel according to claim 1, wherein said comparing means includes a speed-up means for speeding up the image comparison by comparing the image of an arbitrary area of the screen, not the entire screen of the background image. . 4. The high-speed means calculates an average level of a video signal for an arbitrary area of a background image in each illumination mode, and obtains an average level of the video signal for the area of the image data transmitted by the imaging means. 4. The automatic monitoring device in a tunnel according to claim 3, further comprising a speed-up means for comparing the background image with an average level and selecting a background image having the smallest difference. 5. The direct-current component is calculated by comparing the amount of change in clarity of the entire screen due to exhaust gas in a tunnel with a video signal of a background image corresponding to each lighting mode collected in advance. 2. The calculating means according to claim 1, further comprising: a calculating means for subtracting the calculated DC component as a compensation value, and sequentially comparing the image data transmitted by the imaging means with a background image corresponding to each lighting mode previously collected. Automatic monitoring device in tunnel. 6. The discrimination exclusion unit compares image data transmitted by an imaging unit transmitted when a vehicle passes with a background image corresponding to a previously collected illumination mode, and determines whether the video signal pattern is non-similar. 2. The tunnel automatic monitoring device according to claim 1, further comprising: a detection unit configured to detect a shape; and a determination exclusion unit configured not to determine a lighting mode when the vehicle passes by the detection signal of the detection unit.