JPH0512407A - Detector for smoke or dust with image processing - Google Patents

Abstract

PURPOSE:To speedily and exactly identify the source of pollution at a facility to prevent air pollution by monitoring dust or smoke in the various facilities of a large factory such as a iron works or the like. CONSTITUTION:The various facilities are provided to speedily and exactly identify the source of the air pollution by executing a processing 2 such as moving average or the like to fluctuating images 1 in a specified view, next, executing a processing 3 such as differentiation or the like and executing collation/judgement 54 in comparison with the data of a weather detection part 52. Thus, the source of the air pollution can be speedily and exactly identified at all times, the optimum emergency countermeasure can be taken and the air pollution can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for promptly and automatically catching dust, smoke, etc., and promptly taking measures for preventing dust, smoke. In particular, a large factory equipped with a large number of large-scale facilities, such as an integrated steel mill located in a large industrial area, has a single monitoring device that emits dust and smoke generated from its own facilities as other sources. The present invention relates to a method for quickly and surely identifying dust and smoke and identifying dust and smoke originating from the company's own equipment.

[0002]

2. Description of the Related Art According to the prior art, in order to monitor dust and smoke in order to prevent air pollution in integrated steelworks, an ITV camera is installed at a high place such as the top of a gas holder for blast furnace gas. Although the image monitor was monitored by an observer, it can be difficult to distinguish it, especially at night, and it is also possible to identify dust and smoke originating from other factories and public facilities of other companies. It was difficult to do.

[0003]

According to the prior art, a fluctuation image that changes due to sunshine, rainfall, etc. caused by noise such as rain, clouds, etc., such as dust and smoke images in a converter steelmaking plant of a steel mill, etc. Signals caused by changes in dust and smoke are taken out, and only those caused by dust and smoke are taken out and linked to an alarm circuit as a "dust and smoke image", and the company's air pollution sources are distinguished from other air pollution sources and prompt measures are taken. It was impossible to do.

The present invention has been made in view of the above circumstances. By processing a variable image which changes due to sunshine, rainfall, etc., and comparing and contrasting it, only those caused by dust and smoke are taken out and it is distinguished from the air pollution sources of other companies. , "Dust, smoke image" as an alarm, and further to identify the air pollution source of the company and other air pollution sources, and to provide a method for promptly taking measures.

[0005]

A smoke or dust detection device by image processing according to the present invention comprises a camera that repeatedly captures an image of the fixed visual field by an electric signal image storage device that can be decomposed into pixels. Means for converting a change in the luminance of each pixel obtained by moving and averaging an image of a specific field of view over time, and means for differentiating the signal as an independent variable And, if the ratio of the number of pixels in which the first derivative obtained by differentiating in the above has a peak and the peak value exceeds a preset constant value is a dusting smoke image, In the smoke or dust detection device by image processing, which is provided with a means for estimating and a means for issuing an alarm in the above-mentioned case, a plurality of the above-mentioned devices for individually monitoring a large-scale facility that can be a plurality of air pollution sources Data of wind direction and data of wind speed are input at the same time, and the air pollution source is identified and identified between the monitored business office and other general air pollution sources such as business offices and transportation facilities. It is characterized by performing.

[0006]

[Operation] A variable image that changes due to sunshine, rain, etc., such as dust and smoke images of a converter steelmaking plant of a steel mill, is decomposed into pixels, and the discontinuous signal representing the brightness of each pixel is changed continuously. , And then differentiate that continuous variable,
Dust generation and smoke generation are discriminated by the differential value, the signals obtained as a result are supplied to the calculator, and at the same time, the wind direction, wind speed, and sunshine are input to the calculator, and the image pattern data for each pollution source is also input to the calculator. By comparing and collating these three types of signals, it is possible to quickly determine the pollution source, detect dust and smoke at an extremely early stage, and implement emergency measures.

[0007]

An embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing an example of a method for detecting smoke or dust according to the present invention.

In the figure, 1 is a variation image of a specific field of view, that is, an image obtained by an ITV CCD camera in which a converter steelmaking plant is installed on the top of a gas holder for blast furnace gas.
Reference numeral 11 is a regular photographing instruction device. 12 is a CCD camera. 2 is a moving averaging and continuation section. Reference numeral 21 is a pixel decomposing device. Reference numeral 22 is a real-time variable image signal decomposed into pixels. Reference numeral 23 is a moving averaged image forming apparatus for each pixel. 24 is a moving averaged image. Reference numeral 25 is an arithmetic unit that produces a continuous signal that can be differentiated for each pixel. Three
Is a collation determination unit. Reference numeral 31 is a dust generation / smoke determination device by differentiation. Reference numeral 32 is a standard signal generator that removes noise such as rainfall and clouds. 33 is an emergency measure determination device.

In this embodiment, the CCD camera 12 accurately and consistently captures a fixed field of view from a converter steelmaking plant at a distance of about 600 m. The regular photographing instruction device 11 issues a photographing instruction signal at 15-second intervals, and C
The CD camera 12 displays an image of a certain field of view of a converter steelmaking plant.
Take pictures repeatedly every 5 seconds. A screen that captures an image of a certain field of view of this converter steelmaking plant is
1 divided into 256 in the horizontal direction, 240 in the vertical direction, decomposed into 60440 pixels, and leveled into 255 levels of the brightness of the pixel corresponding to each position, that is, "real time decomposed into pixels". Of the fluctuation image signal 22 ″ is converted into a moving average image 24 by moving average of the images by the pixel moving average image generating device 23 with the lapse of time, and a noise signal due to asuka or the like is removed.

Next, the moving averaged image 24 is made into a continuous signal which can be differentiated with respect to time in the arithmetic unit 25 which makes the transition of the luminance of each pixel into a continuous signal differentiable with respect to time. The continuous signal that can be differentiated is differentiated with respect to time as an independent variable by the dust generation / smoke determination device 31 by differentiation to obtain a primary differential coefficient with respect to the passage of time of the luminance change of each pixel.

Further, when the dust generation / smoke determination device 31 produces a peak in the first-order differential coefficient and the ratio of the number of pixels whose peak value exceeds a certain value exceeds a certain value, it is considered to be a dusty smoking. Presumed. If it is estimated that the dust emission is smoke emission, a dust emission smoke signal is sent to the emergency measure determination device 33. The emergency measure determination device 33 determines the emergency measures to be taken, compares and collates them, and sends a signal to the determination unit 54.

In FIG. 1, reference numeral 52 is a weather detector for measuring wind direction, wind speed and sunshine and inputting the signals to a calculator. 5
Reference numeral 3 denotes an image pattern matching unit for each pollution source that accumulates image pattern materials for each pollution source inside the company and in the vicinity of the factory and inputs these materials to the calculator according to the request of the calculator. Reference numeral 54 denotes a calculator, which is a comparison / collation / discrimination unit for rapidly discriminating the pollution source by comparing and collating the three types of signals. 55 is an emergency measure implementation means for preventing dust and smoke.

Devices 1, 11, 1 for detecting dust and smoke
In 2, 2 and 3, dust generation at converter steelmaking plants of steel mills,
Like a smoke image, a variable image that changes due to sunshine, rainfall, etc. is decomposed into pixels and the pixels of several images are moving averaged, and then the brightness of each pixel of the variable image in real time is subjected to difference calculation, and the difference image is used. Discriminate dust and smoke.

Providing the resulting signal to a calculator,
At the same time, input wind direction, wind speed, and sunshine into the calculator. Furthermore, the image pattern data for each pollution source is input to the calculator, and these three types of signals are compared and compared to quickly identify the pollution source, and dust and smoke are detected very early and emergency measures are taken.

FIG. 2 shows how to monitor dust and smoke for preventing air pollution in an integrated steelworks, etc., and install a CCD camera at a high place such as the top of a gas holder for blast furnace gas and input the image signal to a calculator. It is an explanatory view showing a situation in which various means for inputting wind direction, wind speed, and sunshine to a calculator are arranged.

In the figure, reference numeral 12 designates several CCD cameras, each of which fixes a specific pollutant source such as dust or smoke into a visual field. Images of a fixed field of view are repeatedly photographed once every 15 seconds, and real-time variable image signals are sent to the data processing device 67. 61 is an anemoscope,
The wind direction data is sent to the data processing device 67. 6
2 is an anemometer, which processes the wind speed data by a data processing device 6
I am sending to 7. Both the wind vane 61 and the anemometer 62 are shown in FIG.
The weather detecting unit 52 in FIG. Reference numeral 64 is an exhaust gas chimney of a dust collector of a converter steelmaking plant. Reference numeral 65 is an exhaust gas chimney of a dust collector of the billet heating furnace. 66 is a blast furnace breeder. Here, the data processing device 67 is the dust generating device shown in FIG.
Most of the device 51 for detecting smoke generation, an image pattern matching unit 53, a comparison matching and determination unit 54 are included.

By the method of the present invention described above, it is possible to quickly and accurately grasp the source of air pollution 24 hours a day, and to take the most appropriate emergency measure. Further, in this case, the number of mistakes in judgment is extremely reduced.

[0018]

INDUSTRIAL APPLICABILITY The present invention can monitor dust and smoke in various facilities of steel mills such as a blast furnace, a sintering plant, and a heating furnace as well as a converter steelmaking plant, and prevent dust pollution and air pollution. It is very easy to apply to, and it has a great effect on prevention of air pollution, and labor saving of dust and smoke monitoring work has become possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of a method for detecting smoke generation or dust generation according to the present invention.

FIG. 2 is an explanatory diagram showing a situation in which various means for monitoring dust generation and smoke generation of the present invention are provided.

[Explanation of symbols]

 1 Variable Image of Specific Field of View 2 Moving Averaging and Continuing Unit 3 Collation Judgment Unit 11 Timed Shooting Instructing Device 12 CCD Camera 21 Pixel Decomposing Device 22 Real-time Fluctuating Image Signal Decomposed into Pixels 23 Moving Average Image Producing Device by Pixel 24 Moving average image 25 Arithmetic device that produces continuous signals that can be differentiated for each pixel 31 Dust generation and smoke determination device by differentiation 32 Standard signal generation device 33 that removes noise such as rainfall and clouds 33 Emergency measure determination device 52 Meteorological detection unit 53 Contamination source Other image pattern collating unit 54 Comparison collation and discriminating unit 55 Emergency measure implementation means 61 Wind vane 62 Anemometer 64 Exhaust gas stack of dust collector of converter furnace steel factory 65 Exhaust stack of dust collector of billet heating furnace 66 Bleeder breeder 67 Data processing apparatus

Claims (1)

Claim: What is claimed is: 1. An electric signal image storage device that can be decomposed into pixels, and a camera that repeatedly captures an image of the fixed field of view and a moving average of images captured of a specific field of view over time. Means for making the transition of the luminance of each pixel obtained as a signal differentiable with respect to the passage of time, means for differentiating the signal as an independent variable, and the first derivative obtained by differentiating the peak A means for estimating that the image is a dust and smoke image when the ratio of the number of pixels whose peak value exceeds a predetermined constant value exceeds a predetermined value, and means for issuing an alarm in the above case. In the device for detecting smoke or dust generated by image processing, alarms from a plurality of the above-mentioned devices that individually monitor large-scale equipment that can be a source of air pollution are compared and collated, and at the same time a data indicating the wind direction is displayed. -And data indicating the wind speed are input to identify smoke sources or smoke by image processing, which is characterized by distinguishing and identifying air pollution sources between the monitored business establishments and other general air pollution sources such as business establishments and transportation facilities. Dust detection device.