KR100398385B1 - Apparatus and method for estimating image of heating-body - Google Patents

Abstract

The present invention enables accurate and automatic measurement of a thermal image of a heating element that is moved at a traveling speed without stopping or running at low speed, thereby enabling recording and recording of the measured thermal image, thereby improving the heating element monitoring capability. The present invention relates to a measuring apparatus and a method thereof, and according to the present invention, it is possible to accurately measure and record a thermal image of a traveling heating element while maintaining a normal running speed, and to easily adjust a set value according to the size of the thermal image, External noise can be removed by determining the temperature at least twice by minimizing. Especially when applied to a heating element that is running, the effect is excellent in monitoring the thermal image of the outer wall, and it is possible to measure and record it completely automatically. Is applied to a mobile heating element using an infrared camera to obtain excellent accuracy. The equation will contribute to the image processing technology by suggesting a method for acquiring a thermal image of a heating element moving at a high speed. In addition, the present invention does not affect the existing process at all, and automatically measures the heating element in progress and measures the measured thermal image. The recording management improves the heating element monitoring capability, and the method and apparatus of the present invention will be widely utilized by accurately acquiring a thermal image of a moving heating element for the first time.

Description

Apparatus and method for measuring thermal image of mobile heating element {APPARATUS AND METHOD FOR ESTIMATING IMAGE OF HEATING-BODY}

The present invention relates to a thermal image measuring apparatus and a method of a mobile heating element, in particular, to accurately and automatically measure the thermal image of the heating element that is moved at a traveling speed without stopping or running at low speed, thereby recording the measured thermal image The present invention relates to a thermal image measuring apparatus of a mobile heating element which can be managed to improve a heating element monitoring capability and a method thereof.

Generally, in steel mills, hot molten iron from the blast furnace is transferred by a topetoka (molten iron transport vehicle) in a rolling process, which is referred to as "mobile heating element" (TLC) carrying hot molten iron. Refractories are embedded in the inner wall, and the defects caused by improper construction, defects due to improper construction, loss and wear of molten iron and slag in contact with molten iron are not detected. Can cause.

In order to prevent such leakage accidents in advance, by monitoring the thermal image of the outer wall of the mobile heating element (TLC), there is a need to replace and repair the internal refractory at a suitable time before wear below a certain standard.

Conventionally, in the apparatus for measuring the mobile invention (TLC), it relies on the method of directly observing the inner wall surface with the naked eye to confirm the wear of the refractory of the mobile heating element, such a conventional method is to use the molten iron for observation Emptying and observing at a low temperature requires a lot of time to prepare for the inspection, and the inspection work is complicated and cumbersome, and this method has a problem of lowering productivity.

In addition, since the thermal image measuring camera is fixed at a predetermined position in the thermal image measuring apparatus of the moving heating element, there is always a problem in obtaining a thermal image of the moving heating element, which is different from each other. There are problems such as securing a visible area by shape, accurate position determination for acquiring a thermal image of a moving object, and maintaining a constant speed.

In addition, there is a conventional method of inspecting by using a laser rangefinder and a CCD camera, but this method also requires a large amount of time for emptying of the molten iron for the measurement, which interrupts the continuous process, and thus, this mobile heating element (TLC) is used. The method of measuring the temperature distribution of the outer wall and determining the abnormally high temperature part as the wear part of the built-in refractory material is used, which is measured manually by stopping the moving heating element (TLC) or traveling at low speed. Techniques for detecting a heating element by an optical sensor, measuring thermal images, and interpreting the same through an image processing apparatus have been used.

However, this method is a method of stopping the moving heating element or traveling at a low speed, and there is a problem in that it causes a loss of time and impedes the continuous process by providing a load to the driver, and in the case of using an optical sensor, In this case, a wrong signal may be generated, and when two or more mobile heating elements are connected to each other, there is a problem that difficulty in recognition occurs.

In addition, since it is necessary to arrange a plurality of optical sensors to increase the reliability, the device configuration is complicated and the maintenance of the sensor was complicated and cumbersome.

The present invention has been made to solve the above problems, and therefore, an object of the present invention is to accurately and automatically measure the thermal image of a heating element that is moved at a normal traveling speed without noise or noise without stopping or driving at low speed. The present invention provides a thermal image measuring apparatus and method for moving a heating element which can record and manage a thermal image, thereby improving the heating element monitoring capability.

1 is a camera installation state diagram for acquiring a thermal image of a mobile heating element according to the present invention, Figure 1a is one camera installation state diagram, Figure 1b is a two camera installation state diagram.

FIG. 2 is an explanatory view of a thermal image determination region of a moving heating element according to the present invention, and FIG. 2A is a thermal image of a moving heating element that acquires a movie image at an accurate position, and FIG. 2B is a movement obtained when it is acquired at different positions or cannot be acquired. Thermal image of the heating element.

3 is a block diagram of an apparatus for measuring a thermal image of a mobile heating element according to the present invention.

4 is an explanatory diagram of a thermal image determining region of the moving heating element TLC according to the present invention.

5A and 5B are thermographic measurement records of the moving heating element TLC by the second camera 14b of the present invention, and FIGS. 5C and 5D illustrate the moving heating element (1) by the first camera 14a of the present invention. TLC) is a thermographic record.

6 is a flowchart showing a method of measuring and managing a thermal image of a mobile heating element according to the present invention.

All.

7 is an abnormal thermal image or an unwanted thermal image.

FIG. 8 is a flowchart illustrating a method of measuring a moving heating element (TLC) thermal image of FIG. 6.

Explanation of symbols on the main parts of the drawings

1a, 1b: 1st, 2nd track taga, tagb: Tag signal generator

11a, 11b: Optical sensor for forward entrance detection of first and second tracks

12a, 12b: Optical sensor for detecting reverse entry of the first and second lines

13a.13b: Tag signal receiver 14a, 14b: Camera for thermal imaging

15: temperature sensor 50: key input device

100: thermography control device 110: signal processing unit

111: digital input / output unit 112a, 112b: thermal image recognition processing unit

113: tag signal recognition processing unit 114: temperature information processing unit

120: signal bus 130: master control unit

140: slave controller 200: display device

As a technical means for achieving the above object of the present invention, the apparatus of the present invention is mounted on each heating element (TLC) moving on the first and second lines in the thermal image measuring device of the moving heating element (TLC). A tag signal generator for generating a tag signal corresponding to a self identification number; An optical sensor for detecting forward entry of the first and second lines to detect the mobile heating element entering the measurement position; An optical sensor for detecting reverse entry of the first and second lines to sense that the moving heating element passes at the measurement position; A tag signal receiver for receiving a tag signal from the tag signal generator: A thermal imaging camera for photographing a thermal image of a heating element moving on a first and second lines: a temperature sensor for sensing an outer wall temperature of the heating element; A key input device for inputting various variables, a set temperature, and a magnification necessary for measuring a thermal image of the moving heating element, and selecting a movie image display; A thermography control device that recognizes a tag when the heating element enters, selects a camera, measures a thermal image of the heating element, and controls storage and display thereof; A screen display device for displaying a thermal image measured according to the control of the thermal image measurement control device on a screen; Characterized in having a.

In addition, as another technical means for achieving the object of the present invention, the method of the present invention in the method for measuring the thermal image of the moving heating element, by setting the parameters such as temperature, number of pixels, determination region and magnification at power-on A first step of performing an initialization of the system; A second step of determining an entry line and an entry direction of the heating element based on a detection signal of the optical sensor, and selecting a camera of the corresponding line as a reference camera; A third step of receiving a thermal image signal from the camera and measuring a thermal image; A fourth step of determining whether a tag number corresponding to the heating element identification number through the tag signal receiver is valid; A fifth step of determining whether the measured thermal image is a determination region or within a set temperature range; A sixth step of resizing and rearranging the measured thermal image to have the same size; The data is recorded by adding the identification number (tag number) of the heating element, the date and time of obtaining the thermal image, and the classification of the thermal image (camera classification) to the obtained thermal image, and when the data is recorded, the file name is "year (YY)". A seventh step of recording as a month (MM) day (DD) hour (HH) camera classification (X) Tag number (NN) or location information (NN) "; It is characterized by consisting of. **

Hereinafter, an apparatus for measuring a thermal image of a mobile heating element according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a camera installation state diagram for acquiring a thermal image of a mobile heating element according to the present invention, Figure 1a is one camera installation state diagram, Figure 1b is a two camera installation state diagram.

Referring to FIG. 1, a separation distance L (m) between a thermal imaging camera and a moving heating element which acquires a thermal image when the moving heating element to be measured reaches a target position is selected as shown in Equation 1 below. To install the camera for thermal imaging.

As shown in Fig. 1, in the case of installing one camera, the reflection mirrors are installed at three locations (positions ⓐ, ⓑ, ⓒ), and are arranged at a distance of 1 m from these three points. The camera is installed so that the distance lm between the left point ⓐ at the center point ⓑ and the right point ⓒ at the center point ⓑ is the same magnification.

As shown in FIG. 2, when two cameras are installed, the reflecting points of the camera lenses are provided at the center points of the opposite cameras, the two cameras are arranged in a straight line, and the two cameras are separated from each other. Are the same, and according to the geometrical principle, the viewing angle and the viewing area of both cameras are the same.

2 is an explanatory view of a thermal image determining region of a moving heating element according to the present invention, and FIG. 3 is a block diagram of a thermal image measuring apparatus of a moving heating element according to the present invention.

Referring to FIG. 3, a thermal image measuring apparatus of a moving heating element (TLC) according to the present invention is mounted on each heating element (TLC) moving on the first and second lines 1a and 1b and corresponds to a magnetic identification number. Tag signal generators (taga, tagb) for generating a tag signal and optical sensors (11a, 11b) for forward entry detection of the first and second lines (1a, 1b) for detecting the entry of the moving heating element into the measurement position. And optical sensors 12a and 12b for reverse entry detection of the first and second lines 1a and 1b for detecting the moving heating element passing through the measurement position, and tags from the tag signal generators taga and tagb. Tag signal receivers 13a and 13b for receiving signals, thermal imaging cameras 14a and 14b for photographing thermal images of heating elements moving on first and second lines 1a and 1b, and outer walls of the heating elements Input the temperature sensor 15 for sensing the temperature, and various variables, set temperature, magnification necessary for measuring the thermal image of the moving heating element A key input device 50 for selecting a movie image display, a thermal image measurement control device 100 for recognizing a tag when the heating element enters, selecting a camera, measuring a thermal image of the heating element, and controlling storage and display thereof; The display device 200 is configured to display a thermal image measured according to the control of the thermal image measurement control device 100 on a screen.

The thermal image measuring and controlling device 100 includes a digital input / output unit 111 for converting a detection signal from the optical sensors 11a, 11b, 12a, and 12b into a digital signal, and heat from the cameras 14a and 14b. Thermal image recognition processing units 112a and 112b for recognizing and processing images, tag signal recognition processing units 113 for processing signals from the tag signal receivers 13a and 13b, and temperatures from the temperature sensor 15. A signal processing unit 110 including a temperature information processing unit 114 for processing a signal, initializing a signal bus 120 for performing data transmission between the signal processing unit 110 and a control unit, and an internal device; Master control unit 130 for controlling initialization of a setting variable, camera selection, thermal image acquisition, thermal image selection, thermal image size conversion, and thermal image recording based on data from the signal processing unit 110 via the signal bus 120. ), The selection of the thermal image, having the thermal image A slave controller 140 for controlling the recording and the other thermal image history management further comprises.

4 is an explanatory view of a thermal image determination region of a moving heating element (TLC) according to the present invention, Figure 5 is a thermal image measurement record of a moving heating element (TLC) according to the present invention, Figure 6 is This flowchart shows how to measure and manage thermal image of mobile heating element. 8 is a flowchart illustrating a method of measuring a moving heating element (TLC) thermal image of FIG. 6.

Operation according to the present invention configured as described above will be described in detail below based on the accompanying drawings.

When one camera is first installed as shown in FIG. 1, the reflection mirrors are installed in three places, and the positions ⓐ, ⓑ and ⓒ are arranged at the same separation distance (lm: 6m) to measure the thermal image. Install the camera so that the separation distance (lm: 6m) of ⓐ at center point ⓑ and ⓒ at center point ⓑ is the same magnification. In case of installing the second camera as in case 2, the reflecting point of the camera lens is located at the center point of the opposite camera. When two cameras are arranged in a straight line and the separation distance is the same, the viewing angle and the viewing area of both cameras are the same according to the geometric principle.

First, in the first step 131, the system is initialized by setting variables such as temperature, number of pixels, determination region, and magnification at power-on, and setting variables such as temperature, number of pixels, determination region, and magnification. In the initializing of the system, first, a setting variable is input to accurately recognize a moving heating element, which is an area to be determined (right, center, left) and a determination position. The number of pixels, the set temperature and the magnification are set by the input means as system initialization variables.

Specifically, the setting variable selection method will be described in more detail as follows.

4 and 5 are thermal images of a determination region set to right, center, and left to record a thermal image of a moving heating object, wherein the same moving heating elements are different from each other. When the two tracks 1a and 1b alternately travel, the distances of the two infrared cameras 14a and 14b are different, and therefore, the size of the thermal image measured by the cameras 14a and 14b is also different from each other.

The two infrared cameras 14a and 14b according to the present invention continuously measure double-sided thermal images of the moving heating element, and one still image provides 10 thermal images per second, and the infrared cameras 14a and 14b The thermal image consists of 320 pixels wide by 24 pixels high. Then, one thermal image measured by the infrared cameras 14a and 14b is divided into three regions, right (6), center (⑦) and left (⑧), and the number of judgment pixels (20 on the right and the center on each area). 20, left 20, bottom 50) and the temperature range (over 150 degrees).

This setting is important to record when recognizing the existence of the thermal image to be described below, when entering the correct position, the pixel position and the temperature range according to the determination area to satisfy this is shown in Table 1, Such a determination area is automatically calculated by the following equations 2, 3, 4, 5, and 6, so that an appropriate value can be set according to the size of the heating object.

Pixels (pixels) Judgment Area Temperature range Right area Center area Left area 12345 ....... 151617181920 (300,50 <Y <160) (300,50 <Y <160) (300,50 <Y <160) (300,50 <Y <160) (300,50 <Y <160) (300,50 < Y <160) (300,50 <Y <160) (300,50 <Y <160) (300,50 <Y <160) (300,50 <Y <160) (300,50 <Y <160) (160,50 <Y <160) (160,50 <Y <160) (160,50 <Y <160) (160,50 <Y <160) (160,50 <Y <160) (160,50 < Y <160) (160,50 <Y <160) (160,50 <Y <160) (160,50 <Y <160) (160,50 <Y <160) (160,50 <Y <160) (20,50 <Y <160) (20,50 <Y <160) (20,50 <Y <160) (20,50 <Y <160) (20,50 <Y <160) (20,50 < Y <160) (20,50 <Y <160) (20,50 <Y <160) (20,50 <Y <160) (20,50 <Y <160) (20,50 <Y <160) T> 150 (settable) 20 X can be changed, Y is satisfied when the temperature is over 20 pixels

First, the setting variable should be adjusted so that the shape of one mobile heating element can fit in exactly one frame, and the setting value should be changed when the size and shape of the heating element are different. The right side 6, center 7, left side 8 and the determination pixel and temperature range of the region are set and determined by the following equations (2), (3), (4), (5) and (6).

P (Camera A_Area) = P (AX_Left A, AX_Right A), P (AX_Center A) = (160, x)

P (Camera B_Area) = P (AX_Left B, AX_Right B), P (AX_Center B) = (160, x)

AX_Right A≤f (AX_Left A + Xn)

AX_left B≤f (AX_right B-Xn)

Xn = 240 (variable to determine TLC shape

AX_left A = 20 (variable to determine the position of thermal image acquisition of camera A)

AX_left B = 60 (variable to determine the position of thermal image acquisition of camera B)

AX_Right A = 260

AX_Right B = 300

Number of pixels: AX_left, AX_ right, AX_ center ≥ 20 (variable to determine boundary point of TLC shape)

Measurement temperature ≥150 ° C (variable to determine TLC shape)

If the moving heating element TLC enters the second line 1b, the determination infrared camera 14b initializes the set variables AX_right = 300, AX_left B = 60, and AX_center B = 160. Read it to position X axis. The setting variable of AX_left B sets a variable that satisfies AX_left B≥f (AX_right B-240) as shown in Equation 6 above.

If the X-axis is fixed and 20 or more pixels with a set temperature of 150 ° C. or more are continuously measured by reading the temperature value of the pixel in the Y-axis direction, it is determined whether the variables AX_RightB, AX_LeftB, and AX_Central B are all satisfied. The thermal image is then advanced to the recording step when it is satisfied (temperature condition, number of pixels, judgment area).

The set number of pixels is a variable to remove the noise temperature remaining in the thermal image and to remove the abnormal temperature appearing at the boundary of the heating element, and the temperature is a setting value for accurately acquiring the surrounding heating element and the target heating element. The temperature range varies.

Next, in the second step (132, 133a, 133b) it is determined whether the heating element enters the respective tracks and receives the recording data from the camera when the heating element enters, which will be described in more detail below.

According to the present invention, in order to recognize and distinguish a plurality of heating elements (TLC), tag signal generators (Taga, tagb) having an identification number set are attached to a moving heating element to be measured, and a frequency signal tag signal for recognizing this tag number is provided. Receivers 13a and 13b are installed on the respective lines and transmitted to the tag signal recognition processing unit 113 of the signal processing unit 110 in the thermal image measuring and control apparatus 100. The identification number of the heating element is attached to the thermal image information and used for record management and history management.

The thermography control apparatus 100 selects the infrared cameras 14a and 14b to be determined by distinguishing the entry direction and the line by the ON signal of the optical sensor for entrance detection as shown in Table 2 below.

division Entering the first track (1a) Entering the second track (1b) Judgment camera Signal type (4bits) Forward direction Reverse Forward direction Reverse Optical sensor 11a for forward entry detection of first line On Off Off Off 14a 1000 Optical sensor 12a for the first line reverse entry detection Off On Off Off - 0100 2nd preferred forward entrance optical sensor 11b Off Off On Off 14b 0010 Optical line sensor 12b for the second line reverse entry detection Off Off Off On - 0001

In the present invention, the recording operation for the thermal image of the moving heating element is not continuously performed for 24 hours, and it is shown in Table 2 whether the optical sensor (entry detection optical sensors: 11a, 12a, 11b, 12b) enters the moving heating element. Likewise, it is possible to select the line according to the on / off of the optical sensor (the optical sensor for entrance detection). As such, when the line and the direction are selected according to the operation of the optical sensor for entrance detection, the thermal image measuring and controlling apparatus 100 of FIG. 3 is connected to the thermal image recognition processing units 112a and 112b of the signal processing unit 110 and the infrared cameras 14a and 14b. Command to acquire a thermal image from

In this way, the thermal images acquired by the two cameras 14a and 14b are different in size from each other, and the moving heating elements traveling through the respective tracks 1a and 1b alternate with each other through the first and second tracks 1a and 1b. Since the roads are driven by the tracks, the thermal images on both sides of the moving heating element are naturally different from each other according to the track. The infrared cameras 14a and 14b are installed so that the respective lines 1a and 1b are within the measurement range.

The measurement distance of the infrared camera 14a is 13m away from the first line 1a, and the measurement distance of the infrared camera 14b is 13m away from the second line. However, the infrared camera 14a and the second line, the infrared camera 14b and the first line 1a are spaced 17.5m apart. The total visible area of 14m is considered to enter the infrared camera field of view. In this way, the separation distance is different, and the thermal image is different in size.

Next, in the third step 134, the thermal image is measured by the photographing data input from the cameras 14a and 14b, which will be described in detail with reference to FIG. 8.

This third step 134 includes selecting an actual thermal image (target thermal image) of the heating element, which is characteristic of the heating element thermal image, and sometimes afterimages due to speed differences exist and due to snow or boiling Abnormal thermal images or unwanted thermal images may exist in the portion of FIG. 7 in which the thermal image of the heating element is reflected on the ground surface.

In order to eliminate such environmental factors, when selecting the actual thermal image from the thermal image acquired in step 5-2 below, the horizontal and vertical directions are always from the center point (X-axis number / 2, Y-axis number / 2) of the camera image. The thermal image is read to determine whether the temperature condition is satisfied.

First, as shown in Equation 7 below, the first pixel position at which the temperature lower than the set temperature variable is read out horizontally in both directions from the image center point (X-axis number / 2, Y-axis number / 2) of the camera is set by the set variable. X1 (left region) and X2 (right region) are recorded, and the number of pixels is read in the vertical direction, and the first pixel position at which a temperature lower than the set temperature variable is read is calculated and recorded as in Equation 8 below.

The center point of the thermal image with the boundary point read in the above manner is calculated as shown in Equation 9 to determine the center point of the thermal image.

Setting Variable Number of Pixels (Number of Pixels) = n (Repeat Number)

Temperature variable (measured temperature) = t

Yl = (YL1 + YR2) / 2

Center point (X, Y) = ((X2-X1) / 2 + X1, (Y2-Y1) / 2 + Y1)

By the way, as in the embodiment of the present invention, when it is difficult to obtain the actual thermal image due to the abnormal shape, the surrounding thermal image and the flame, the position determined to be the flame or the normal shape in the vertical direction is arbitrarily used to remove it. Choose. In this way, by selecting the selected X-axis position and reading the number of pixels in the vertical direction, the first pixel position (YL1, YR2) at which the temperature lower than the temperature variable value is read is determined, and the average position as shown in Equation (8) is used as the vertical boundary point of the heating element. Choose.

The boundary point reads the number of pixels from the image center point of the camera and judges the first pixel position where the temperature lower than the temperature variable is read as the boundary point to acquire the thermal image, and satisfies the result calculated in this manner, the temperature variable, and the number of pixels. The position is the boundary point for acquiring the thermal image.

In the same manner as described above, when the number of pixels is read from the center point, it is generated in the part (Fig. 7B) reflected on the ground due to the afterimage, snow or rain generated around the moving heating element due to the speed difference of the moving invention. The abnormal thermal image and noise of the thermal image due to the upper flame (Fig. 7) of the moving heating element can be removed.

Next, in the fourth step 135, it is determined whether the tag number corresponding to the heating element identification number through the tag signal receiver is valid, which means that each heating element generates a tag signal generator for generating a high frequency tag signal corresponding to the identification number. taga, tagb) are mounted, and when the radio signal generated by the tag signal generators (taga, tagb) is received by the tag signal receivers 13a, 13b and transmitted to the thermography control device 100, The tag signal processing unit in the image measurement control device 100 determines whether the identification number is valid, and if it is valid, proceeds to the next step and if not, proceeds to the second steps 132, 133a, and 133b.

And, by installing the camera (14a, 14b) as shown in Figure 1, the slight difference of the thermal image measured by the camera (14a, 14b) is minimized, the thermal image of the heating element entering by the camera installed in this way Follow the steps.

In the fifth step 136, it is determined whether the measured thermal image is a determination area or a set temperature range, which includes steps 5-1 and 5-2. Explain.

Step 5-1 includes removing white noise from the camera image. In general, since the white noise is generated by ambient sunlight, the signal processing unit generally performs filtering.

However, since sunlight has all frequencies, some white noise is included even when filtered, causing errors in measurement of the thermal image. To eliminate this, when the thermal image enters the determination region, the camera image to be acquired If the temperature is satisfied at least two times at the center point of X (X axis number / 2, Y axis number / 2) and satisfies the preset temperature conditions, it is determined that the thermal image of the heating element has reached the image center point of the camera, Remove

At this time, if the temperature condition set at the image center point of the camera is satisfied in one measurement, the temperature of the center point is determined again. Generally, the white noise is generated at a higher frequency, so that the white noise is generated more than the camera scan time at the same position. Because of the short time, white noise does not appear more than once at the same location. On the other hand, since the moving speed to be measured actually exists within the camera scan time, the thermal image is normally recognized because the center point temperature condition is satisfied.

Step 5-2 is a step of selecting a thermal image from the set determination region by photographing a continuous thermal image, which is mainly recognized in the horizontal axis (X axis) direction and two methods in the vertical axis (Y axis) direction. It can be divided into.

In these two methods, the setting of the determination area, the temperature range and the number of pixels in the determination area are made, and it is recognized that the thermal image exists only when the temperature is higher than the set temperature.

On the other hand, among the methods of selecting the thermal image of the heating element in the desired position, the thermal image size may be 1/2 or more than the image width of the camera and less than 1/2, where the thermal image size is 1 / th of the camera image width. If it is less than 2, when the thermal image enters and reaches the image center point of the camera, the thermal image is acquired in the visible region of the camera image as shown in FIG. 2, so that the thermal image of the heating element can be selected as one center point.

On the other hand, when the size of the thermal image is 1/2 or more than the width of the camera image, when the thermal image enters and acquires one of the center points of the camera image, as shown in FIG. 2, the thermal image may acquire the thermal image within the visible region of the camera image. I can't. In this case, in order to obtain an accurate thermal image, a determination region equal to the size of the thermal image of the heating element can be set to accurately acquire the thermal image.

On the other hand, the time taken to recognize and acquire a thermal image is long because the controller processes a long time according to the set number of pixels, the number of pixels of the camera, and the set temperature range per pixel. In order to obtain a thermal image by judging a thermal image by at least the number of pixels, the determination region is minimized to one center point and two determination positions (right / top, left / bottom) where the center point is symmetrical.

First, a method of recognizing in the horizontal axis (X-axis) direction will be described. Even though the size of the thermal image of the heating element is different by adjusting two symmetrical points (right / top and left / bottom), By 10, 11 and 12, the thermal image of the mobile heating element can be selected.

Position (AX_Center) = (pixels / 2, pixels / 2)

AX_Right≤f (AX_Left + Xn), (Xn = 240, value applied by mobile heating element)

Here, the setting variable: AX_left = XLn, (XLn = 20, the value applied by the moving heating element), the number of pixels = n (TLC set number of pixels: AX_ left, AX_ right, center ≥ 20), measurement temperature ≥ temp (temp = 150 ° C, TLC setting).

FIG. 2A illustrates a thermal image of the moving heating element corresponding to the case where the film image is acquired at the correct position, and FIG. 2B illustrates the thermal image of the moving heating element corresponding to the case where it is acquired at different positions or when acquisition is impossible. .

Next, the method of recognizing in the vertical axis (Y axis) direction is the following equation

Calculate and apply as

Position (AY_Center) = (pixels / 2, pixels / 2)

AY_Top≤f (AY_Bottom + Yn), (Yn = 120, value applied by mobile heating element)

Setting variable: AY_Bottom = YBn (YBn = 20, value applied by mobile heating element),

Here, the number of pixels = n (the number of TLC set pixels: AY_Top, center ≥ 20) (the number of TLC set pixels: AY_Bottom ≥ 50), the measurement temperature ≥ temp (temp = 150 = ° C, the moving heating element is set) value).

In this way, the correct position for the thermal image of the moving heating element is selected.

Next, in the sixth step 137, since the installed positions of the plurality of cameras are different, the thermal images of the same heating element are different from each other, and the sizes of the thermal images are resized so that the measured thermal images are the same. The detailed description is as follows.

In the sixth step 137, in order to record the thermal image acquired in the third step, the noise of the thermal image is removed and an actual target thermal image is obtained, wherein the thermal image noise is determined by the speed difference of the moving object. Other heating elements such as abnormal thermal images generated on the part (FIG. 7) of the surface of the mobile heating element due to afterimages, snow or rain generated around the mobile heating element, and an upper flame (FIG. 7) of the mobile heating element. It can also be caused by.

In the sixth step 137, since the installed positions of the plurality of cameras 14a and 14b are different from each other, the size of the thermal image is also different for the same heating element. Rearrangement.

As shown in FIG. 4, it can be seen that the thermal images of both sides measured by two cameras 14a and 14b installed at different distances are different from each other. Resizing to a shape and rearranged, thereby recording and managing thermal images at the same position.

On the other hand, when the measured thermal image is enlarged, the number of pixels per unit area of the thermal image increases and accordingly, the temperature value of each pixel is different from the pixel position of the camera and the pixel position of the thermal image. It will be in the wrong place in the process, making accurate data management impossible.

The measured and recorded thermal images are enlarged as shown in Equation (16) so as to have the same size, and are enlarged first on the horizontal axis and then on the vertical axis. Increasing the number of pixels per unit area increases and temperature correction of each pixel is necessary. The temperature correction selects the median average value by the matrix averaging method so as to be similar to the actual measured temperature of the thermal image. The temperature value for each pixel after enlargement is calculated by recording the temperature value of each pixel before and after enlargement as shown in Equation 16 below.

Magnification = │1 ± (Size of thermal image to be enlarged / Size of reference thermal image) │

Where Mxy (temperature after expansion) = Nxy (temperature before expansion), M12 (temperature after expansion) = (N11 + N12) / 2, M32 (temperature after expansion) = (N11 + N21) / 2, M21 (temperature after magnification) = (N11 + N31) / 2, M12 (temperature value after magnification) = (N11 + N13) / 2, M22 (temperature value after magnification) = (N12 + N32) / 2, M23 ( Temperature value after expansion) = (N12 + N33) / 2.

In this regard, the temperature values per pixel of the thermal image measured before enlargement are shown in Table 3, but the size of the pixel after enlargement is different and the measured temperature values are the temperatures located at the position matrix N11, matrix N21, matrix N12, and matrix N22 of the pixel. The temperature value of the pixel positioned in the middle after the enlargement is used as the average temperature value of the temperature values of the matrix N11, the matrix N21, the matrix N12, and the matrix N22. The temperature value per pixel before and after this expansion is shown in Table 3.

Main item Nxy before zoom Nxy after zoom Temperature conversion N11 N12 M11 M12 M13 M21 M22 M23 N21 N22 M31 M32 M33 Remarks First, in the vertical direction, the magnification and the temperature of the pixel are applied by Equation 16.

In the thermal image resizing in the above-described manner, all conditions such as pixel position, temperature value, and thermal image size are the same.

In this way, the thermal image of the selected heating element is the same size, but if the speed of the heating element is fast, the thermal image position is slightly different due to the fast moving speed of the heating element within the camera scan time. (Scan Time) is constant but occurs when the speed of the heating element is changed. In addition, due to the slight difference between the vibration of the two cameras and the installation position, the selected thermal image position is slightly different.

In order to correct such a slight difference, each center point of the selected heating element is moved to be positioned at the center point (X-axis number / 2, Y-axis number / 2) of the camera image, and rearranged. The image is recorded on the screen of the screen display apparatus 200 of FIG. 3 by recording thermal image data by means of recognizing the number of each thermal image (tag reader of designated frequency type, molecular recognizer of number recognition, etc.).

Finally, in the seventh step 138, data is recorded by adding an identification number (tag number), a thermal image acquisition date and time, a thermal image classification (camera classification) of the heating element to the obtained thermal image, When recording data, record the file name as "Year (YY) Month (MM) Day (DD) Hour (HH), Camera Classification (X), Tag Number (NN) or Location Information (NN)".

If you do not distinguish between multiple heating elements and multiple (both) thermal images (thermal images from multiple cameras) when you store and record the last selected thermal image, or display it on the screen, Information cannot be analyzed or used.

Therefore, a plurality of heating elements are assigned to each identification number to automatically recognize the identification number recognition processing unit built-in to distinguish the heating elements, if the identification number recognition of such a heating element is normally input to the thermal image measuring and control device 100 The thermal image is recorded and displayed in a file structure as described above, so that information can be easily selected by managing information for a long time.

In this way, a designated file name can be used to display the stored thermal image information. The thermal image information can display thermal images by date, time, camera, and heating element. According to the present invention as described above, When the thermal image is recorded and managed, various characteristics and changes of the heating element can be known for a long time.

FIG. 5 is a diagram for explaining a method of measuring and recording a thermal image of a moving heating element TLC. Referring to FIG. 5, a recording result of a thermal image is described according to a setting parameter.

When the infrared camera 14b of the second line 1b of FIG. 3 becomes a criterion, this is determined by the above equations (3) and (5). In addition, when the infrared camera 14a of the first line 1a becomes the determination criterion, this is determined by the above equations (2) and (4).

On the other hand, when the moving heating element enters the second line 1b, and when the AX_right B setting value is small, as shown in FIG. 5A, the thermal image of the moving heating element is measured and recorded before fully entering the entire image. As shown in Fig. 5B, when the difference between AX + left B set value and AX_right B set value is large, the thermal image of the moving heating element does not meet the determination conditions and measurement becomes impossible.

In addition, since the infrared camera 14a of the first line 1a has the opposite direction of entry of the thermal image of the second line 1b of the infrared camera 14b, as shown in FIG. 5C when the AX_left A set value is large. Likewise, the thermal image of the mobile heating element cannot be measured and recorded before fully entering, and the entire image cannot be measured. Also, as shown in FIG. 5D, when the AX_right A setting value and the AX_right A setting value are large, The mobile heating element thermal image does not meet the determination conditions and cannot be measured.

In the configuration of the apparatus of the present invention, it can be seen that the pixel interval 270 is appropriate in consideration of various cases of the thermal image, that is, the size difference, the moving speed, etc. according to the different line entry, and the present invention is repeated as described above. It is possible to measure and record thermal images of a plurality of heating elements by the method.

In addition, in FIG. 7, there is a part that is reflected on the ground surface due to the presence or absence of speed difference, snow or rain due to the characteristic of the heating element thermal image, and the flame is generated on the moving heating element. An error occurs, and the thermal image is measured and recorded from the center points 160 and 120 in the vertical direction of the moving heating element in the thermal image determination to remove such environmental factors.

First, by reading the number of pixels in the horizontal (both horizontal) direction of the moving heating element at the center point (160.120) and calculated as shown in the following equation (17) at the first pixel position (X1, X2) the temperature lower than the set temperature variable 150 ℃ Determine the X axis length. After calculating this length value, the X-axis position (X1, X2) is calculated by the following equation (18) for the position without flame in the vertical direction at the center point (160.120), and the number of pixels is read in the vertical direction. The first pixel position (Y1 at X1, X2) at which a temperature lower than 150 ° C. is read is judged and averaged as shown in Equation 19 below, and the lower first pixel reads the number of pixels at the center point (160.120) and the temperature lower than 150 ° C. The position Y2 having 50 or more read pixels is determined as in Equation 20 below to determine the Y-axis length.

X at center (H) = (160-Xh1) + (Xh2-160)} / 2

X1 (at V1) = Xh1 (Horizontal) +90

X2 (at V2) = Xh2 (Horizontal) -90

Y1 = {(120-Yv1 (at V1)) + (120-Yv2 (at V2))} / 2

Y at center (V) = {(120-Y1) + (Y2-120)} / 2

Y2: Number≥50 (read value in the X axis direction), Temp≥150 ° C

By reading the number of pixels at the center point in the same manner as described above, it is possible to remove noise due to the reflection of the surface of the ground caused by afterimages, snow or rain, and the generation of flames on the upper portion of the moving heating element.

On the other hand, when a plurality of heating objects run on different tracks (positions), the size of the thermal image measured by the two infrared cameras are different. This is because the size of the thermal images on both sides measured by two infrared cameras installed at different distances are different. This can be rearranged to the correct size and shape as follows:

The measured and recorded thermal image enlarges the thermal image by the set magnification, and the thermal image is first enlarged on the horizontal axis, and the temperature value is determined by the matrix average method as shown in Table 4 below, and then enlarged on the vertical axis.

Main item Before expansion (temperature value: 2x2) After magnification (temperature value 3x3) Temperature conversion 300 ℃ 320 ℃ 300 ℃ 305 ℃ 310 ℃ 303 ℃ 305 ℃ 303 ℃ 305 ℃ 310 ℃ 305 ℃ 308 ℃ 310 ℃ Remarks X, Y-axis magnification and temperature value according to Equation 9 apply matrix average value

The measured temperature of the pixel before enlargement is as shown in Table 4, but the size of the pixel after enlargement is different, and the temperature value of the intermediate pixel matrix 1.2 averages the temperature of the matrix 1.1 and the temperature of the matrix 1.3. One temperature value is selected, and the temperature value of the matrix 2.1 is selected by averaging the temperature value of the matrix (1.1) and the temperature of the matrix (3.1). 1.2) Select the average temperature value between the temperature value and the temperature value of the matrix (3.2). Then, the temperature value of the matrix is calculated as shown in Table 4 in the same manner as above.

The thermal image of the same size enlarged as described above is positioned so that the center point of the length is 160 (X-axis) on the horizontal axis, and rearranged based on the bottom (Bottom) on the vertical axis. This is because bottom boundary is clearly and accurately recognized.

In the same manner as described above, a thermal image entered by the installed camera is performed as follows. As shown in FIG. 3, two infrared cameras 14a and 14b for measuring the outer wall thermal image of the heating element are 13m in each line A and B. The thermal image is continuously measured by being installed at the side surface spaced apart from each other, and the thermal image is recorded by the thermal image recognition processing unit (Frame Graber). The thermal image data recorded in this way can be transferred to another PC.

According to the present invention as described above, the thermal image of the running heating element can be accurately measured and recorded while maintaining the normal running speed, and the setting value can be easily adjusted according to the size of the thermal image, and the determination area is minimized to two or more times. External noise can be eliminated by determining the temperature, and especially when applied to a heating element that is running, the effect is excellent for monitoring the thermal image of the outer wall, and the measurement and recording can be performed completely automatically.

In addition, the present invention has obtained excellent accuracy by applying to a moving heating element using an infrared camera, this method will contribute to the image processing technology by suggesting a method for obtaining a thermal image of the heating element moving at a high speed.

In addition, the present invention improves the heating element monitoring ability by automatically measuring the heating element in progress and recording and recording the measured thermal image without affecting the existing process at all, and by accurately acquiring the thermal image of the moving heating element for the first time in the system. The method and apparatus of the present invention will be widely utilized.

Claims (5)

In the thermal image measuring apparatus of the moving heating element (TLC), A tag signal generator (taga, tagb) mounted on each of the heating elements TLC moving on the first and second lines 1a and 1b to generate a high frequency tag signal corresponding to a magnetic identification number; Optical sensors 11a and 11b for forward entry detection of the first and second lines 1a and 1b for detecting the mobile heating element entering the measurement position; Optical sensors 12a and 12b for detecting reverse entry of the first and second lines 1a and 1b for detecting the moving heating element passing through the measurement position; Tag signal receivers (13a. 13b) for receiving tag signals from the tag signal generators (taga, tagb): Thermal imaging cameras 14a and 14b for capturing a thermal image of a heating element moving on the first and second lines 1a and 1b on the first and second lines 1a and 1b: A temperature sensor 15 for sensing an outer wall temperature of the heating element; A key input device 50 for inputting various variables, a set temperature, and a magnification necessary for measuring a thermal image of the moving heating element, and selecting a movie image display; A thermography control device 100 which recognizes a tag when the heating element enters and selects a camera to measure a thermal image of the heating element to control storage and display thereof; A screen display device for displaying a thermal image measured according to the control of the thermal image measurement control device 100 on a screen; Thermal image measuring apparatus of a mobile heating element, characterized in that it comprises a. According to claim 1, wherein the thermography control device 100 is a digital input and output unit 111 for converting the detection signal from the optical sensor (11a, 11b, 12a, 12b) into a digital signal and the camera 14a A thermal image recognition processing unit (112a, 112b) for recognizing and processing a thermal image from 14b, a tag signal recognition processing unit (113) for processing a signal from the tag signal receivers (13a, 13b), and the temperature sensor A signal processing unit 110 including a temperature information processing unit 114 for processing a temperature signal from 15; A signal bus 120 for performing data transmission between the signal processor 110 and the controller; Initialize the internal device, and initialize setting parameters, camera selection, thermal image acquisition, thermal image selection, thermal image size conversion and thermal image recording based on the data from the signal processing unit 110 via the signal bus 120. A master control unit 130 for controlling; A slave controller 140 which controls selection acquisition of a thermal image, recording of thermal image data, and thermal image history management; Thermal image measuring apparatus of a mobile heating element, characterized in that it comprises a. In the thermal image measuring method of the mobile heating element, A first step (131) of initializing the system by setting parameters such as temperature, number of pixels, determination region, and magnification at power on; A second step (132, 133a, 133b) of determining the entry line and the entry direction of the heating element based on the detection signal of the optical sensor and selecting the camera of the corresponding line as the reference camera; A third step (134) of receiving a thermal image signal from the camera and measuring a thermal image; A fourth step 135 of determining whether a tag number corresponding to the heating element identification number through the tag signal receiver is valid; A fifth step (136) of determining whether the measured thermal image is a determination region or a set temperature range; A sixth step (137) of resizing and rearranging the measured thermal image to have the same size; The data is recorded by adding the identification number (tag number) of the heating element, the date and time of obtaining the thermal image, and the classification of the thermal image (camera classification) to the obtained thermal image, and when the data is recorded, the file name is "year (YY)". A seventh step (138) of recording as a month (MM) day (DD) hour (HH) camera classification (X) Tag number (NN) or location information (NN) "; Thermal image measuring method of a mobile heating element, characterized in that consisting of. The method of claim 3, wherein the fifth step (136) If the temperature is checked twice or more at the center point (X axis number / 2, Y axis number / 2) of the camera image to be acquired and satisfies the preset temperature conditions, the thermal image of the heating element has reached the image center point of the camera. A step 5-1 of determining to remove the white noise; And A method of selecting a thermal image from a set determination region by taking a continuous thermal image, and setting the determination region, the temperature range and the number of pixels in the determination region, and recognizing that the thermal image exists only at or above the set temperature. Step 5-2; Thermal image measuring method of a mobile heating element, characterized in that consisting of. The method of claim 3, wherein the sixth step (137) A thermal image measuring method for a mobile heating element, characterized by selecting a thermal image as an actual target by removing noise of the thermal image in order to record the obtained thermal image.