JPH02107904A - Abnormal access detector - Google Patents

Abstract

PURPOSE:To enable detection of an abnormal access of a moving object without requiring labor by setting an area on a digital screen to judge that is undergoes an abnormal access to detect a change in the digital screen within the area. CONSTITUTION:An image signal of the vicinity of a transmission line 21 and a steel tower 20 photographed with an ITV camera 1 is converted into digital with an A/D converter 2. An image processing section 3 processes the image signal converted digitally and applies a pixel signal for building a digital screen to a central processing section 4 and an image memory section 5. The steel tower 20, the transmission line 21 and a crane vehicle 22 are projected on the digital screen 30 built by the pixel signal. Then, when the crane vehicle 22 approaches the transmission line 21 abnormally, the pixel signal changes on a detection line 31 in the screen 30. This change is detected as variations in density on the screen 30 with a density change detecting section, thereby indicating an abnormal access of the crane vehicle 22.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an abnormal approach detection device that detects an abnormal approach by a moving object approaching a fixed object, and particularly relates to an abnormal approach detection device that uses image processing technology. The present invention relates to an abnormal approach detection device.

[Prior Art and Problems to be Solved by the Invention] For example, when a crane 1F is used to perform high-altitude work near a transmission line tower, there is a risk that the crane truck will come into contact with the power transmission line. Conventionally, in order to prevent accidents due to contact, one of the workers constantly monitors the distance between the crane turret and the power line, and if the crane approaches the power line abnormally, that worker or the crane The driver has been notified. Therefore, it is necessary for the worker to continuously monitor the crane vehicle while the crane is working, and the worker's labor force is not utilized effectively.

Furthermore, it has been impossible to carry out such monitoring using existing detection means, such as those using mechanical switches or lasers, because the detection range is spatially wide.

This invention was made to solve the above-mentioned problems, and its purpose is to detect abnormal approach of a moving object in an unmanned manner.

[Means for Solving the Problems] The abnormal approach detection device according to the present invention includes an imaging means for photographing the surroundings of a fixed object, and an image (i) obtained by digitally converting the image captured by the imaging means. a digital conversion means for outputting pixel signals constituting a digital screen;
The apparatus includes an area setting means for setting an area on the digital screen where an abnormal approach should be determined, and a detection means for detecting a change in the set area of the digital screen in response to a pixel signal from the digital conversion means.

[Operation] In the abnormal approach detection device according to the present invention, the digital conversion means digitally converts the image signal from the imaging means and outputs a pixel signal. An object fixed by this pixel signal (
-1 digital screen is constructed. On the digital screen, an area setting means sets an area that should be judged as abnormal approach. When a moving object approaches a fixed object, the pixel signal from the digital conversion means changes.

When a moving object approaches abnormally, the number of pixels (M number) changes in a set area on the digital screen. This change is detected by the detection means, so that the abnormal approach of the moving object is recognized.

[Practice/Example of the Invention] FIG. 1 is a conceptual diagram showing a working situation when using an abnormal approach detection device 10 showing an embodiment of the present invention. 1st
Referring to the figure, a crane truck 22 is shown working at a height near a power transmission line 21 stretched between two transmission line towers 20. ITV camera 1 shows crane truck 22 and power line 2
1 and is set in a position where the distance between the two can be monitored. The abnormal approach detection device 10 is connected to receive a signal imaged by the ITV camera 1. Further, the speaker 9 connected to the device 10 is set toward the crane ton 22.

FIG. 2 is a block diagram showing the hardware configuration of the abnormal approach detection device 10 shown in FIG. 1. Referring to FIG. 2, this abnormal approach detection device 10 includes an ITV camera 1
A/D that digitally converts the image signal captured by
A converter 2, an image processing unit 3 that outputs pixel signals for configuring a digital screen based on digitally converted image signals, and a central processing unit 4 that receives and processes pixel signals from the image processing unit 3. , an image memory section 5 for storing pixel signals outputted by the image processing section 3, and a processing memory section 6 for storing data signals processed by the central processing section 4.

The device 10 also includes a monitor for checking captured images, a display for checking processing results by the central processing unit 4, a keyboard and a mouse for input, and a computer for connecting these. It includes a monitor interface 8 and an external interface 7. Speaker 9 is connected to external interface 7 .

FIG. 3 is a block diagram showing the central processing unit 4 shown in FIG. 2. Referring to FIG. 3, the central processing unit 4 includes an image input unit 41 that receives pixel signals (digital image signals) from the image processing unit 3 or the image memory unit 5, and a detection unit 41 that indicates an area where abnormal approach should be determined. A detection line setting section 42 that sets a line, a density change detection section 43 that detects a change in density of a pixel signal on the set detection line, and a post-processing section 44 that performs post-processing such as recognition based on the density change. and an output section 45 that outputs the processed signal.

FIG. 4 is an image diagram showing a digital screen formed by pixel signals in the central processing unit 4 shown in FIG.

Next, the operation of the abnormal approach detection device 10 will be explained with reference to FIGS. 2 to 4.

First, as shown in FIG. 2, an image signal of the vicinity of the power transmission line 21 and the steel tower 20 captured by the ITV camera 1 is digitally converted by the A/D converter 2. The image processing unit 3 processes the digitally converted image signal,
The central processing unit 4 processes pixel signals for configuring a digital screen.
and is applied to the image memory section 5.

The central processing section 4 receives pixel signals from the image processing section 3 through the image processing section 41 . As shown in FIG. 4, a steel tower 20, a power transmission line 21, and a crane truck 22 are displayed on a digital screen 30 made up of pixel signals. The detection line setting section 42 shown in FIG.
A plurality of detection lines 31 are set on this digital screen 30 to set areas where abnormal approach should be determined. The density change detection section 43 constantly detects density changes on the detection line 31.

As shown in FIG. 4, the crane truck 22 or the power transmission line 21
When the object approaches abnormally, the pixel signal changes on the detection line 31 in the digital screen 30. This change is detected by the density change detection unit 43 as a density change on the screen 30,
Abnormal approach of the crane truck 22 is recognized.

When the abnormal approach of the crane truck 22 is detected in this way, as shown in FIG. 1, the crane truck 22 is notified of the abnormal approach by the spica 9, and the danger is avoided. In this embodiment, a post-processing section 44 is provided in the central processing section 4, and the following processing can be performed.

That is, since a plurality of detection lines 31 are set in this embodiment, the pixel signals on the detection lines 31 change sequentially due to abnormal approach of the crane truck 33. I wanted to,
By detecting the order in which pixels No. 15 of the detection line 31 change, the moving direction of the crane truck 22 can also be detected. Further, if the distance between the crane truck 22 and the ITV camera 1 is known, the moving speed of the crane truck 22 can also be detected.

FIG. 5 shows the steel tower 20 as shown by the dotted line in FIG.
5 is a screen diagram showing a digital screen 33 corresponding to FIG. 4 when the ITV camera 1a is set at the top of the screen. FIG. As shown in FIG. 5, when the ITV camera 1a is provided at the top, a curved detection line 32 may be set. Even in this case, abnormal approach of the crane truck 22 can be detected.

In addition, in the above embodiment, when the surrounding brightness changes, the pixel signals on the plurality of detection lines 31 or 32 change simultaneously, so it can be easily recognized that this is not due to abnormal approach of the crane truck 22. . Furthermore, even if leaves or the like are present near the detection line 3 or 32 and move, the rate of change of the pixel signal to be detected may be set so as not to be affected by this movement.

In this way, according to this embodiment, abnormal approach of a moving object can be detected in a spatially wide range without using existing detection means.

[Effects of the Invention] As described above, according to the present invention, an area where an abnormal approach should be determined is set on the digital screen, and a detection means for detecting a change in the digital screen in that area is provided. An abnormal approach detection device capable of detecting an abnormal approach of a moving object without requiring much effort has been obtained.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a working situation when using an abnormal approach detection device showing an embodiment of the present invention. FIG. 2 is a block diagram showing an example of the hardware configuration of the abnormal approach detection device shown in FIG. 1. FIG. 3 is a block diagram showing an example of the central processing section shown in FIG. 2. FIG. 4 is a double-sided view showing an example of a digital screen configured in the central processing unit shown in FIG. FIG. 5 is a screen diagram showing a digital screen configured in the central processing unit shown in FIG. 2 in another embodiment of the present invention. In the figure, 1 is an ITV camera, 2 is an A/Di converter, and 3 is an ITV camera.
is an image processing unit, 4 is a central processing unit, 9 is a speaker, 10 is an abnormal approach detection device, 20 is a transmission line tower, 2] is a power transmission line, 22 is a crane truck, 41 is an image human power unit, 42 is a detection line a setting section, 43 a density change detection section, 44 a post-processing section,
45 is an output section.

Claims (1)

[Scope of Claims] An abnormal approach detection device for detecting abnormal approach by a moving object approaching a fixed object, comprising: an imaging means for capturing an image around the fixed object and outputting an image signal; a digital conversion means connected to the imaging means and configured to digitally convert an image signal output from the imaging means and output pixel signals for configuring a digital screen; and determining the abnormal approach on the digital screen. an area setting means for setting an area to be detected; and a detection means for detecting a change in a digital screen in the area set by the area setting means in response to a pixel signal from the digital conversion means. Detection device.