JPS6352267A - State monitoring device - Google Patents

Abstract

PURPOSE:To attain a state monitoring operation via an image pickup device of a single system and a sampling circuit by using a reference picture memory and a monitor picture memory and comparing the same address data of both memories with each other. CONSTITUTION:A reference picture 8 or a monitor picture 8a is stored in a reference picture memory 6 or a monitor picture memory 6a via an image pickup device 3 and a sampling circuit 4. In this case, the picture 8 serving as the monitor reference is stored in the memory 6 as a reference picture to be compared later with the picture 8a. This picture 8a is stored in the memory 6a in each monitor cycle and a normal or abnormal state of the picture 8a is checked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a condition monitoring device using an imaging device such as an ITV.

[Conventional technology]

Conventional equipment has a monitoring panel equipped with meters and indicators.
The images are simply taken with an imaging device such as a TV camera and displayed on the TV, and humans read the data from the displayed image to determine whether the values are normal or in a normal state.
I was judging.

Also, as a similar device although the purpose is different, there is a conventional monitoring device that uses an imaging device to compare a reference drawing and a drawing to be inspected, and determines whether there is a difference between the two drawings. For example, FIG. 2 shows a monitoring device published in Japanese Patent Publication No. 61-7670. In FIG. 2, 1 is a reference object, 1a is an object to be inspected,
2.2a is an optical system such as a lens, 3, 3a is an imaging device, 4
, 4a is a sampling circuit, 5 and 5a are shift registers, 6.6a is a two-dimensional image memory, 7 is a comparison logic circuit, 8
8a is a reference image, and 8a is an image to be inspected.

Next, the operation of the device configured in this way will be explained. The reference object 1 has a reference image 8 which is a regular two-dimensional image.
is drawn, and the object to be inspected 1a is compared with the reference object 1 for inspection. The two-dimensional image 8.8a is photographed by the imaging devices 3, 3a via the optical system 2.2a;
It is important to simultaneously scan corresponding points of the dimensional image.

The video signal from the imaging device 3.3a is periodically sampled by sampling circuits 4, 4a. As a result, a video signal obtained from one row of scanning lines of a two-dimensional image is time-divided and converted into a binary video signal. The shift register 5.5a is constituted by the same number of storage elements as the number of samples per sub-light of the scanning line, and inputs and temporarily stores the binary video signal, and shifts it based on a synchronization signal. The two-dimensional image memory 6.6a contains the reference image 8,
Each image to be inspected 8a is divided into square elements and stored. When a boundary line is detected from the contents of the two-dimensional image memory 6 for the reference image 8, the comparison logic circuit 7 determines whether or not a boundary line is detected within a predetermined range for the image to be inspected 8a, and based on the result, Determine the quality of the inspected image.

[Problem that the invention seeks to solve]

Since the conventional device is configured as described above, it uses a plurality of imaging devices, scans these imaging devices synchronously, takes pictures, synchronizes and corresponds each of the obtained two-dimensional images, and stores them in a storage element. There was a problem in that it had to be stored, which basically resulted in a dual configuration, and it also required synchronized shooting and processing, making it technically complex.

The present invention has been made in view of these points, and its purpose is to provide an inexpensive and simple state in which changes from the reference state of an image can be detected using one imaging device and one processing device. The goal is to obtain monitoring equipment.

[Means for solving problems]

In order to achieve such an object, the present invention provides a condition monitoring device that photographs and monitors various meters and indicators using an imaging device such as an ITV camera. A monitoring image memory for rewriting monitoring image data each time, and a comparison logic circuit for comparing and processing data at the same address in the reference image memory and the monitoring image memory each time are provided.

[Effect]

In the present invention, a reference image is stored in a reference image memory, and the reference image and the monitoring image are compared during subsequent monitoring.

〔Example〕

An embodiment of a condition monitoring device according to the present invention is shown in FIG. In FIG. 1, reference numeral 9 denotes a monitoring panel on which images are displayed; 10, a reference image memory that stores a reference image 8 as an image of a reference state taken first; and 10a, a monitoring board as an image to be inspected taken during monitoring. This is a monitoring image memory that temporarily stores images 8a. In FIG. 1, the same or equivalent parts as in FIG. 2 are given the same reference numerals. The comparison logic circuit 7 successively compares the contents of the reference image memory 10 and the monitoring image memory 10a for each same address, extracts a difference, and determines whether or not the monitoring image is normal based on the aspect of the difference.

Next, the operation of this device will be explained. The reference image 8 or the monitoring image 8a is sent to the reference image memory 6 or the monitoring image memory 6a via the imaging device 3 and the sampling circuit 4.
is accumulated in At this time, the reference image 8 that serves as a reference for monitoring is stored as a reference image in the reference image memory 6, and is used for comparison with the monitoring image 8a later. Surveillance image 8a
is accumulated in the monitoring image memory 6a every monitoring cycle, and it is verified whether the monitoring image 8a is normal or not.

The verification method in this device is to perform logical AND or subtraction processing on the binary signals of roj and rlJ stored in both memories 6.6a for each same address, and as a result, all addresses become "0". Both memory 6
．． It is determined whether there is a difference between 6a. In this case, it is also possible to provide a tolerance range around the reference image 8 and determine that there is no change if the monitored image falls within this tolerance range. If it is outside the allowable range, it may be displayed on the monitoring panel 9 or may be notified by an alarm.

Further, in the above embodiment, an example of monitoring the indicated value of a meter is explained, but the object of monitoring may be a number, and in this case, the same effects as in the above embodiment can be achieved.

〔Effect of the invention〕

As explained above, the present invention provides a reference image memory and a monitoring image memory, and compares and processes data at the same address in both memories, thereby making it possible to monitor the status with a single system of imaging device and sampling circuit. Therefore, an inexpensive and simple device can be obtained. Furthermore, since the reference image is fixed, there is an effect that the comparison logic circuit is simple.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of a condition monitoring device according to the present invention, and FIG. 2 is a system diagram showing a conventional condition monitoring device. 3... Imaging device, 4... Sampling circuit, 7...
- Comparison logic circuit, 8... Reference image, 8a... Monitoring image, 9... Monitoring board, 10... Reference image memory, 10
a... Monitoring image memory.

Claims (1)

[Claims] In a condition monitoring device that photographs and monitors various meters and indicators using an imaging device such as an ITV camera, there is a reference image memory that holds an image of a reference state, a monitoring image memory that rewrites monitoring image data each time monitoring is performed, and a monitoring a comparison logic circuit that compares and processes data at the same address in the reference image memory and the monitoring image memory each time, and
A condition monitoring device that automatically detects data values such as display values and generates an alarm as necessary.