JPH0933354A - Temperature abnormality detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the influence of the vibration of an object or device to be inspected by taking the output image of an infrared camera into an image reading circuit, correcting the position of the output image of the reading circuit, and detecting and displaying an abnormality on the basis of this output image. SOLUTION: An infrared camera 1 photographs the image of an object to be inspected, and an image reading circuit 2 stores this image as an inspection image after it is converted into a digital signal. An image processing means 50 is formed out of a position correcting circuit 5 and an image processing circuit 3, and the circuit 5 takes the normalized correlation with a reference image by using the image of the object free from position fluctuation which is preliminarily stored as the reference image to correct the position of the inspection image. The circuit 3 takes the difference between the reference image and the inspection image read this time to provide a differential image and performs an image processing after the variable-density differential image is binarized with a threshold as it is to detect the area changed in density. Further, with respect to the density-changed area, the presence of abnormality of the area is judged and displayed on a display circuit 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature abnormality detecting device for detecting an abnormality such as gas leakage in equipment such as a plant, peeling of heat-resistant bricks, etc. online, and particularly to eliminate the influence of an object to be inspected or vibration of the device. The present invention relates to a possible temperature abnormality detection device.

[0002]

2. Description of the Related Art When an abnormality such as a gas leak in a plant or peeling of heat-resistant bricks occurs, the temperature of the portion changes, so that the abnormality can be detected online by observing this state with an infrared camera. It is possible.

In particular, it is effective to detect an abnormality online because it is not necessary for a person such as an inspector to work in a bad environment such as a high temperature and a dangerous atmosphere.

FIG. 3 is a block diagram showing an example of such a conventional temperature abnormality detecting device. In FIG. 3, 1 is an infrared camera, 2 is an image capturing circuit, 3 is an image processing circuit,
Reference numeral 4 is a display circuit.

The output of the infrared camera 1 is connected to the image capturing circuit 2, the output of the image capturing circuit 2 is connected to the image processing circuit 3, and the output of the image processing circuit 3 is connected to the display circuit 4.

Now, the operation of the conventional example shown in FIG. 3 will be described. The image of the object to be inspected is taken by the infrared camera 1,
The image capturing circuit 2 stores the image after converting it into a digital signal.

The image processing circuit 3 uses a previously stored image of the object to be inspected as a reference image and the image captured this time as an inspection image to generate a difference image and generate a difference image to detect an abnormal temperature. The result is output by determining the presence or absence of.

For example, if there is no abnormality, there is no large temperature change between the reference image and the inspection image, so no abnormality appears in the difference image, but if the temperature of that portion rises due to gas leakage or the like, The temperature of the relevant portion of the inspection image also rises, and the abnormality appears on the difference image.

Therefore, the display circuit 4 displays the image of the object to be inspected based on the output of the image processing circuit 3 and, if there is an abnormality, the temperature change or the abnormal portion.

[0010]

However, when the object to be inspected vibrates or the position of the infrared camera 1 shifts due to vibration or the like, the shooting positions of the reference image and the inspection image change, and the object to be inspected changes. There is a problem that the same point above does not become the same pixel on the image, and an abnormality appears on the difference image even though there is no abnormality actually. Therefore, an object of the present invention is to realize a temperature abnormality detection device capable of removing the influence of the vibration of the object to be inspected or the device.

[0011]

In order to achieve such an object, according to the present invention, an infrared camera for taking an infrared image of an object to be inspected in a temperature abnormality detecting device for detecting temperature abnormality of equipment online. An image capturing circuit that captures and holds an output image of the infrared camera, an image processing unit that corrects the position of the output image of the image capturing circuit and detects an abnormality based on the output image, and an image processing unit of the image processing unit. And a display circuit for displaying an abnormal state based on the output.

[0012]

The effect of the vibration can be eliminated by providing the position correction circuit to correct the position variation of the inspection image due to the vibration of the object to be inspected or the apparatus.

[0013]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an embodiment of the temperature abnormality detecting device according to the present invention. In FIG. 1, reference numeral 5 is a position correction circuit, and reference numerals 1 to 4 are the same as those in FIG. Also,
3 and 5 constitute the image processing means 50.

The output of the infrared camera 1 is connected to the image capturing circuit 2, and the output of the image capturing circuit 2 is connected to the position correction circuit 5. The output of the position correction circuit 5 is connected to the image processing circuit 3, and the output of the image processing circuit 3 is connected to the display circuit 4.

The operation of the embodiment shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a flow chart for explaining the operation of the embodiment shown in FIG.

First, in FIG. 2A, the infrared camera 1 captures an image of an object to be inspected, and the image capturing circuit 2 converts the image into a digital signal and stores it as an inspection image.

In FIG. 2B, the position correction circuit 5 uses a previously stored image of an object to be inspected, which does not have a position change, as a reference image, and takes a normalized correlation with this reference image. The position of the inspection image is corrected by.

In FIG. 2C, the image processing circuit 3 obtains a difference image by taking the difference between the reference image and the inspection image captured this time.

2D, the image processing circuit 3 performs image processing such as blob analysis of grayscale as the difference image or binarization of the difference image with a threshold value and then blob analysis. The changed area of is detected.

Further, the image processing circuit 3 is shown in FIG.
In regard to the temperature change area, whether there is an abnormality in the area is judged based on the area and the temperature difference, and the result is displayed on the display circuit 4.

As a result, by providing the position correction circuit 5 to correct the position variation of the inspection image due to the vibration of the object to be inspected or the apparatus, the influence of the vibration can be removed.

[0022]

As is apparent from the above description,
The present invention has the following effects. By correcting the position variation of the inspection image due to vibration or the like by the position correction circuit, it is possible to realize the temperature abnormality detection device capable of removing the influence of the vibration of the inspection object or the device.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a temperature or higher temperature detection device according to the present invention.

FIG. 2 is a flowchart illustrating the operation of the embodiment shown in FIG.

FIG. 3 is a configuration block diagram showing an example of a conventional temperature abnormality detection device.

[Explanation of symbols]

 1 infrared camera 2 image capturing circuit 3 image processing circuit 4 display circuit 5 position correction circuit 50 image processing means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Riki Furuya 2-932 Nakamachi, Musashino City, Tokyo Yokogawa Electric Co., Ltd. (72) Inventor Miwa Yanagawa 2-932 Nakamachi, Musashino City, Tokyo Horizontal Within Kawa Denki Co., Ltd.

Claims (1)

[Claims] 1. A temperature abnormality detecting device for detecting a temperature abnormality of a facility online, an infrared camera for capturing an infrared image of an inspection object, and an image capturing circuit for capturing and holding an output image of the infrared camera, An image processing unit that corrects the position of the output image of the image capturing circuit and detects an abnormality based on the output image, and a display circuit that displays an abnormal state based on the output of the image processing unit are provided. Temperature abnormality detection device.