KR102039016B1 - Concentration monitoring system and method - Google Patents

Abstract

The present invention relates to a concentration monitoring system to measure the concentration of suspended solids (SS) included in a fluid such as recovery water of cement or the like and, more specifically, to a system and a method for analyzing and calculating an image of a fluid photographed by a photographing device. The concentration monitoring system of the present invention can measure the concentrations of SS mixed in a liquid, thereby preventing damage of a pipe, a sensor or the like and keeping a device clean.

Description

Concentration Monitoring System and Method {CONCENTRATION MONITORING SYSTEM AND METHOD}

In order to measure the concentration of SS (Suspended Solid) contained in recovered water such as cement, the present invention analyzes and calculates an image of a fluid photographed using an imaging device, and monitors concentrations applicable to corrosive, adhesive, and abrasive fluids. A system and method thereof are provided.

In general, the concentration measuring device is used to measure the concentration of raw materials that are not mixed when the concentration of various sludges precipitated in various water treatment sites-water treatment plants, sewage treatment plants, wastewater treatment plants, or flow with liquid in the pipe or when mixing cement. Used.

Various sludges or unmixed raw materials flowing with the liquid are called SS. SS (suspended solid) is a suspended solids and is called a suspended solids. In terms of particles suspended in a fluid, microorganisms, viscosities, sand vegetation, and the like may correspond to a stream, and may include recovered water, which is water that is cleaned inside a tank in which sand, cement, and the like are mixed.

Recently, as interest in the environment has increased and various regulations have been expanded and strengthened due to a change in awareness, efforts for proper disposal of industrial by-products have become critical. Therefore, the ready-mixed concrete industry, which is the main producer of concrete, needs to pay attention to the treatment of industrial by-products generated during the ready-mixed concrete production process.

So far, there has been little interest in the recovery water in ready-mixed concrete plants, but recently, the interest is increasing due to environmental problems. By recycling the recovered water, the positive effects such as preventing environmental pollution and reducing waste disposal costs are very large. Interest is also growing.

In the production of ready-mixed concrete, concrete attached to the ready-mixed mixer truck or batcher plant of the ready-mixed concrete cannot be disassembled due to the mixing of water, etc. Need cleaning At this time, since the generated wastewater is a strong alkaline environmental pollutant, it may cause water and soil pollution when discharged or disposed in a natural state, and recently, it has been neutralized or reused with a recovered water recycling facility. In addition, in order to reuse the recovered water, there is a background to solve the problems such as the lack of water and the disposal cost of the ready-mixed concrete, and the shortage of the waste stockyard, in addition to preventing such environmental pollution.

In other words, the recovery water directly affects the quality of ready-mixed concrete, and since there is no reliable recovery water measuring equipment, it is impossible to find a complete reuse plan. Therefore, it is urgent to prepare a method to reduce the ready-mixed concrete production and save the environment.

Accordingly, in order to recycle the recovered water, the real-time and quantitative measurement of the ready-mixed concrete wastewater, the technology to manage the quality of the ready-mixed concrete through the effective recovery water concentration measuring system, and the minimization of the ready-mixed concrete which can cope with the fluctuation materials There is a need to develop a technology that improves productivity by controlling the amount of purified water and using rational and efficient clean water (tap water).

By developing measurement equipment related to recovery water recycling, creating a market for ready-mixed concrete wastewater quality management system, reducing the environmental load by using all of ready-mixed concrete wastewater classified as wastewater, and securing the leadership status of related technologies through the development of the world's only equipment, There is a need to reduce social costs such as demolition costs due to poor quality concrete, reduce dispute costs by preventing premature construction, and improve external credibility among suppliers, builders, and managers.

A technique for measuring the concentration of ready-mixed concrete wastewater in real time has been disclosed in Korean Patent Publication No. 10-2016-0049304 (concrete recovery water concentration measurement system using optical, 2014.10.27. The prior art relates to a system for measuring the concentration of recovered coke concrete using optics, in which one light sensor and two light receiving sensors are sequentially arranged with respect to the light emitting sensor, and corresponding to the concentration value of the sample water. The concentration of the concrete recovered water was measured by measuring the concentration value of the sample water using the electromotive force value corresponding to the concentration value of the sample water measured from the light receiving sensor based on the set step electromotive force value. However, the prior art is to measure the turbidity, suspended matter and high concentration of the sample water by receiving the sample water (or concrete recovery water) is introduced and flow into the inner space of the cell block unit provided in the measuring device to emit infrared light As a self-government, the apparatus was in direct contact with the sample water (or concrete recovery water). Accordingly, when the sample water (or the concrete recovery water) exhibits corrosiveness, adhesiveness, or abrasion, pipes and sensors are easily damaged, leading to an unmeasurable state, and easily failing.

Korean Patent Publication No. 10-2016-0049304 (Concrete recovery water concentration measurement system using optical, 2014.10.27.)

By using the concentration monitoring system according to an embodiment of the present invention, it is possible to measure the concentration of the SS mixed in the liquid in a non-contact manner, to prevent damage to the pipes, sensors, etc., and to keep the device clean.

The system for measuring the concentration of the fluid without contacting the fluid is the first of the coordinates of the pixel in the image photographed by the photographing means (having an MXN pixel and the coordinates of each pixel are represented by a first coordinate value and a second coordinate value). Grouping the coordinate values by the same pixel, performing a frequency analysis on pixel values of pixels belonging to the group for each group, and analyzing the frequency for each pixel having the same second coordinate value among the coordinates of the pixels on which the frequency analysis has been performed An image analyzer which calculates a sum or average of the performed pixel values and provides information indicating a difference between pixel values between adjacent pixels; A quantifier for quantifying a reference value for density determination using a difference in pixel values between adjacent pixels; And a concentration calculator configured to calculate a concentration corresponding to the quantified reference value using the previously generated concentration determination function.

In addition, when the concentration calculator is provided with a plurality of preset concentration values of the fluid and the quantified reference values corresponding to the plurality of concentration values are respectively calculated by the quantifier, the plurality of concentration values and the respective corresponding values are calculated. The concentration determination function is generated using the quantified reference values.

The image analyzer may use a gray value as the pixel value when performing the frequency analysis.

In addition, the image analyzer generates a first array, which is a one-dimensional array having pixel values of pixels belonging to the group for each group, and performs frequency analysis on the elements through a fast Fourier transform (FFT). Generates an FFT coefficient array to which FFT coefficients are applied for each element, and represents a difference between pixel values between adjacent pixels using a sum or average of FFT coefficients of elements having the same second coordinate value among the generated FFT coefficient arrays. A second array, which is a one-dimensional array, is generated, and the quantization unit adds the FFT coefficient values of the second arrays to output the reference value for the concentration determination.

In addition, the quantization unit may use the FFT coefficient values of the arrays corresponding to the medium frequency and the high frequency range among the low, middle, and high frequencies of the predetermined range among the second arrays when summing the FFT coefficient values of the second arrays. It features.

In addition, the quantifier extracts arrays corresponding to half of frequency components repeated in a symmetrical form among the second arrays, and calculates a reference value for the concentration determination using the FFT coefficient values of the extracted arrays. Characterized in that.

The method may further include a concentration control unit configured to transmit a control signal to administer a substance for raising or lowering the calculated concentration value when the calculated concentration value is less than or exceeds a predetermined criterion.

The apparatus may further include a user interface providing unit configured to set a region of interest in the image photographed by the photographing unit, and the image analyzer may include the frequency of the region of interest set by the user interface providing unit. Characterized in that to carry out the analysis.

The method for measuring the concentration of a fluid without contacting the fluid by the fluid concentration measuring system includes: (a) an image photographed by the photographing means (having MXN pixels and the coordinates of each pixel are represented by first and second coordinate values). Group the first coordinate value among the coordinates of the pixel by the same pixel, perform a frequency analysis on the pixel value of the pixels belonging to the group for each group, and the second of the coordinates of the pixels on which the frequency analysis is performed. Calculating the sum or average of pixel values for which the frequency analysis is performed for each pixel having the same coordinate value and providing information indicating a difference between pixel values between adjacent pixels; (b) quantifying the reference value for density determination using the difference in pixel values between adjacent pixels; And (c) calculating a concentration corresponding to the quantified reference value using the previously generated concentration determination function.

It also comprises a computer program stored on a recorded medium containing a series of instructions for carrying out the method.

By the concentration monitoring system according to an embodiment of the present invention, the concentration of suspended solids (SS) mixed in the liquid can be measured in a non-contact manner, thereby preventing damage to pipes, sensors, and the like, and keeping the device clean. Do.

1 is a view showing a conventional concentration measurement system.
2 is a view showing the configuration of a concentration monitoring system according to an embodiment of the present invention.
3 (a) to 3 (b) show the generation of the X and Z arrays.
4 to 5 show processing of the Z array.
6 illustrates quantification of a reference value for concentration determination in accordance with an embodiment of the present invention.
7 is a diagram showing the generation and the result of the concentration determination function according to an embodiment of the present invention.
Figure 8 (a) is a view showing a texture analysis low concentration image according to an embodiment of the present invention.
Figure 8 (b) is a view showing a texture analysis high density image according to an embodiment of the present invention.
9 is a flowchart illustrating a concentration monitoring process according to an embodiment of the present invention.

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings.

The accompanying drawings are only examples to illustrate the technical idea of the present invention in more detail, and thus the technical idea of the present invention is not limited to the forms of the accompanying drawings.

In order to measure the concentration of SS (Suspended Solid) contained in recovered water such as cement, the present invention analyzes and calculates an image of a fluid photographed using an imaging device, and monitors concentrations applicable to corrosive, adhesive, and abrasive fluids. A system and method thereof are provided.

1 is a view showing a conventional concentration measurement system. Referring to FIG. 1, the conventional concentration measurement system measures a measurement sensor by directly putting it into a fluid. When the measuring sensor is in direct contact with the fluid, the measured value is output to the output unit through the concentration meter. As the measurement sensor was put directly into the fluid, the contact surface in contact with the fluid may be corroded or damaged, resulting in low accuracy of the measured concentration value or frequent replacement of the measurement sensor.

2 is a view of the configuration of the concentration monitoring system 100 according to an embodiment of the present invention. As illustrated in FIG. 2, the concentration monitoring system 100 according to an embodiment of the present invention is largely an image analyzer 110, a quantifier 120, a concentration calculator 130, a concentration controller 140, and a user. The interface providing unit 150 may be included. The above configuration will be described in more detail.

The image analyzer 110 may group the pixels of the same X-axis coordinates or the pixels of the same Y-axis coordinates in an image composed of M X N pixels photographed by the photographing means.

Referring to FIG. 3 (a) and FIG. 3 (b), when the coordinate of each pixel is '(m, n)' in an image composed of M pixels on the X axis and N pixels on the Y axis, image analysis is performed. The unit 110 is an example of pixels having the same X-axis coordinate value, that is, coordinates (1, 1), (1, 2), (1, 3), (1, 4) ... (1 , N-2), (1, N-1), and (1, N) pixels may be classified (grouped) into one group, and such grouping may be performed up to the Mth number of pixels on the X-axis.

As another embodiment of pixel-by-pixel grouping of images, the image analyzer 110 may include pixels having the same Y-axis coordinate values, that is, coordinates (1, 1), (2, 1), (3, 1), ( Pixels 4, 1) ... (M-2, 1), (M-1, 1), (M, 1) can be grouped, and this grouping can be performed up to the Nth number of pixels on the Y axis. have.

As described above, the image analyzer 110 may group each pixel having the same X-axis coordinate value or the same Y-axis coordinate value, and group each pixel value of the pixels belonging to each group into a 'one-dimensional array'. Can be listed. That is, each pixel value of the pixels in each group becomes an element of the one-dimensional array.

Hereinafter, the image analyzer 110 will be described by applying an embodiment of grouping pixels having the same X-axis coordinate value.

Thereafter, the image analyzer 110 may perform frequency analysis using Fast Fourier Transform (FFT) on the elements of each group grouped as described above. That is, frequency analysis is performed for each group by the number corresponding to the number N of pixels on the Y axis. In this case, the image analyzer 110 may perform frequency analysis using only gray components of pixel values. Of course, the frequency analysis may be performed using all components of the pixel value, but according to an embodiment of the present invention, even when only gray values of the pixel values of the image are used, the analysis result of the image texture does not have a big difference, but rather, image processing time. This had a shortening effect. When the image analyzer 110 performs frequency analysis on the one-dimensional array of each group, the FFT coefficient for each element is generated as a result, and thus, the one-dimensional array of each group may be represented by the FFT coefficient array. Hereinafter, the FFT coefficient array of each group will be referred to as an 'X array' and represented by the following equation.

In addition, the image analyzer 110 may sum or calculate an average value of elements having the same Y-axis coordinates among elements of the X array, that is, elements having the same array address n among the above-described X array values of each group. You can create a one-dimensional array of elements. Hereinafter, this array will be referred to as a 'Z array' and represented as follows.

As a result, the Z array may be information representing a difference in pixel values between adjacent pixels in an image.

4 to 5 are diagrams showing the processing of the Z array. 4 is a diagram illustrating a Z array, and illustrates that a Z array may be generated by a sum of elements (FFT coefficients) having the same array address n among the X arrays, that is, the same Y-axis coordinates. Of course, as mentioned above, the array address n of the X arrays may generate a Z array with an average value of the same arrays.

Meanwhile, the quantifier 120 may output a reference value for concentration determination using the Z array provided by the image analyzer 110. Hereinafter, the operation of the quantization unit 120 will be described in detail with reference to FIGS. 5 to 6.

5 shows an embodiment in which the quantifier 120 uses only an array corresponding to half of the Z array.

The Z array is symmetrical to each other, and the frequency components are repeatedly displayed. The quantization unit 120 may reduce the image processing time by using only an array corresponding to half of the Z array.

FIG. 6 is a diagram illustrating that the quantization unit 120 outputs a reference value for concentration determination using a Z array.

The quantization unit 120 may extract arrays corresponding to the medium frequency and the high frequency range among the low frequency, the medium frequency, and the high frequency of the predetermined range from the Z arrays. The reason for excluding the array corresponding to the low frequency is that the difference in pixel values between adjacent pixels is not large in the case of the array corresponding to the low frequency. In other words, it can be excluded to improve the processing speed. Subsequently, the quantization unit 120 may add the element values (FFT coefficients) of the arrays corresponding to the medium frequency and high frequency ranges in the Z array and use them as reference values (SAC; Sum of AC coefficient) for determining the concentration. It is as follows when expressed by formula

Where I is the frame index of the image, and AC in the SAC represents the mid and high frequency ranges. In general, direct current (DC) is a low-frequency wave, and alternating current (AC) corresponds to a high frequency so that it is named as AC.

Meanwhile, when the concentration calculator 130 is given a plurality of predetermined concentration values for one fluid, and the quantized reference values SAC corresponding to each concentration value are calculated by the quantifier 120, the concentration calculator 130 is given in advance. A plurality of concentration values and corresponding quantified reference values may be used to generate a 'concentration determination function'.

For example, image analysis of a fluid having a concentration of 20% through the system 100 of the present invention may yield a corresponding SAC value, which is expressed as (d1, s1), respectively. It can be a point. Then, when the fluid having a predetermined concentration of 30% is analyzed again through the system 100 of the present invention, the corresponding SAC value can be calculated again, and expressed as (d2, s2), respectively, another one The concentration determination function may be generated using two or more points obtained as described above. This is expressed as an equation below.

For reference, when the image analysis target is a ready-mixed concrete, the higher the concentration, the higher the SAC value, and the lower the concentration, the lower the SAC value.

7 is a view showing a method and a result of generating a concentration determination function according to an embodiment of the present invention.

As described above, the concentration calculator 130 may generate a concentration determination function using at least two points obtained by analyzing the fluid having a predetermined concentration at least twice and calculating a corresponding SAC value. Can be.

The concentration calculator 130 may calculate the concentration of the fluid to be determined using the concentration determination function generated by the above process. That is, when an image composed of the MXN pixels photographed by the photographing means is input, the above-described SAC value is output by the image analyzing unit 110 and the quantizing unit 120 as a result, and the output SAC value is input to the density determination function. Substituting can yield corresponding concentration values.

Meanwhile, when the concentration value of the fluid calculated by the concentration calculator 130 is less than or exceeds the predetermined reference, the concentration controller 140 may output a control signal for adjusting the proper concentration. In one embodiment, when the current concentration value is higher than a predetermined reference value, the concentration controller 140 may output a control signal for inputting an amount of water corresponding to the difference between the current concentration value and the reference concentration value, and the current concentration value is If it is lower than a predetermined reference, a control signal may be output to inject an amount of material (such as cement) corresponding to the difference between the current concentration value and the reference concentration value. To this end, the concentration controller 140 may be connected to components such as a water input unit (not shown) and a material input unit (not shown) by wire or wirelessly, and the water input unit (not shown) and the material input unit (not shown). A communication unit (not shown) for communication with the city may also be connected.

Meanwhile, the user interface providing unit 150 may set a region of interest in the image photographed by the photographing means. That is, although the above-described image analysis may be performed on all regions of the captured image, it is possible to perform faster processing if only the necessary region is set as the ROI and the above-described image analysis is performed on the ROI.

The user interface providing unit 150 may provide a user interface for setting a region of interest to a user (operator). For example, the user interface may be set by using a mouse drag or selected using a pointer of a mouse. The location to be set as the region of interest may be set. Thereafter, the image analyzer 110 may perform the above-described image analysis on the selected ROI using a mouse drag or a pointer.

For reference, the concentration monitoring system 100 according to an embodiment of the present invention may further include an image input unit (not shown) that receives an image photographed by a photographing means (not shown) installed on the top of the fluid. The image photographed from the photographing means may be connected to the image input unit through an RCA (Radio Corporation of America) input terminal (not shown). In this case, the RCA input terminal is a connector for connecting the captured color image to the image input unit, and any cable capable of serving as a connection means can be replaced without being limited thereto. For example, it can be replaced with various cables such as TV cable and HDMI.

In addition, the photographing means may include a photographing apparatus such as a camera, any device capable of photographing a fluid containing a float. In addition, the photographing means is installed vertically to more accurately photograph the cross section of the fluid, it may be installed at various angles according to the embodiment. In addition, the photographing means may photograph a color image for more accurate image processing, but may include a photographing device for photographing a black and white image according to an embodiment, and may further include a device for grasping the shadow of the black and white image in the image input unit. .

In addition, the concentration monitoring system 100 may further include an image encoder (not shown) and an image decoder (not shown). The image encoder is for encoding an image photographed through a photographing means, and encodes an image input through an RCA interface into a Y channel, a Cb channel, and a Cr channel.

In addition, the density monitoring system 100 may include a digital signal processor (DSP) (not shown) for performing a density measurement algorithm of an input image and a field programmable gate array (FPGA) (not shown) for displaying the measured concentration in real time. It may further include.

A DSP is an integrated circuit that allows a machine to process digital signals quickly. It is used to code analog signals. The DSP performs an algorithm for measuring density based on color image processing, and performs control of an image encoder, an image decoder, an FPGA, and a current output unit. The DSP is only a device according to one embodiment, and may be any device for an algorithm for concentration measurement.

In addition, the FPGA performs an image processing OSD (On Screen Display) and is provided to display the measured density in real time. The FPGA is only a device according to an embodiment and may be any device that can be displayed in real time.

In addition, the concentration monitoring system 100 may further include an output unit (not shown). The output unit can be any device having an output means such as a monitor, a TV, a tab, etc., which can display a result value such as a numerical value or a picture, but is not limited thereto. In addition, the output unit may be connected to the RAC output terminal. The RCA output stage is a cable means for transmitting the processed value, like the RCA input stage, and any cable capable of serving as a connection means can be replaced without being limited thereto. For example, it can be replaced with various cables such as TV cable and HDMI.

8 (a) is a view showing a texture analysis low concentration image according to an embodiment of the present invention, Figure 8 (b) is a view showing a texture analysis high concentration image according to an embodiment of the present invention. In order to process an image according to an exemplary embodiment of the present invention, a camera installed on the top of the fluid captures a screen as shown in FIGS. 8 (a) to 8 (b). As shown in (a) of FIG. 8, if the texture analysis is performed, the texture of the middle or high frequency region is relatively low when compared to the high concentration, and the texture is smooth because the concentration is low. On the contrary, if the texture analysis is performed at a high concentration as shown in FIG. 8 (b), the component of the AC region appears relatively high when compared with the low concentration, and the texture is rough because the concentration is high.

9 is a flowchart illustrating a concentration monitoring process according to an embodiment of the present invention.

The concentration measurement process of FIG. 9 may be performed by the concentration monitoring system 100 shown in FIG. 2, for which the computer program stored in a recorded medium including a series of instructions for performing the process shown in FIG. 9. It may be installed in the concentration monitoring system 100.

The density monitoring system 100 generates a one-dimensional array by grouping the X coordinate values of the pixel coordinates in the image photographed by the photographing means by the same pixel, and applies the pixel values of the pixels belonging to the group for each group (one-dimensional array). An X array is generated by performing an FFT on the signal (S901).

If the FFT is performed on the one-dimensional array of each group, FFT coefficients are generated for each element of the one-dimensional array as a result, which can be represented by the aforementioned X array.

After S901, the density monitoring system 100 calculates the sum or average of pixel values for each pixel having the same Y coordinate value among the coordinates of the pixels on which the FFT is performed, and generates a Z array that is a one-dimensional array having the element as an element (S902).

Here, the Z array may refer to information representing a difference in pixel values between adjacent pixels.

If the region of interest is set in the image photographed by the photographing means before S901, the concentration monitoring system 100 does not perform the operations of S901 to S902 for the entire region of the image, but operates S901 to S902 only for the region of interest. Can be performed.

After S902, the density monitoring system 100 quantifies the reference value for density determination using the difference in pixel values between adjacent pixels (S903).

Here, the concentration monitoring system 100 may use only an array corresponding to half of the Z array, and among these, the arrays corresponding to the middle frequency and the high frequency range among the low frequency, the middle frequency, and the high frequency of the predetermined range are extracted, and the FFTs of the corresponding arrays are extracted. Coefficients can be used to quantify as a reference value for concentration determination.

After S903, the concentration corresponding to the quantified reference value is calculated using the previously generated concentration determination function (S904).

Here, the concentration monitoring system 100 is given a plurality of predetermined concentration values for the fluid to be measured, and if the quantified reference values (SAC) corresponding to each concentration value are calculated through the processes S901 to S903, the plurality of predetermined values The concentration determination function and its corresponding quantified reference values can be used to generate a 'concentration determination function'.

After S904, the concentration monitoring system 100 transmits a control signal to administer a substance for raising or lowering the calculated concentration value when the calculated concentration value falls below or exceeds a predetermined criterion (S905).

The present invention is not limited to the above-described embodiments, and the scope of application of the present invention is not limited to those of ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Of course, various modifications are possible.

100: concentration monitoring system
110: image analysis unit
120: quantification unit
130: concentration calculation unit
140: concentration control unit
150: user interface providing unit
S901 ~ S905: Concentration Monitoring System Steps

Claims (11)

In a system for measuring the concentration of a fluid without contacting the fluid,
In the image photographed by the photographing means (having an MXN pixel and the coordinates of each pixel are represented by the first coordinate value and the second coordinate value), the first coordinate value among the coordinates of the pixels is grouped by the same pixel and corresponding to each group. A frequency analysis is performed on pixel values of pixels belonging to the group, and the sum or average of the pixel values on which the frequency analysis is performed is calculated for each pixel having the same second coordinate value among the coordinates of the pixels on which the frequency analysis has been performed. An image analyzer providing information indicating a difference in pixel values between pixels;
A quantifier for quantifying a reference value for density determination using a difference in pixel values between adjacent pixels; And
Concentration calculator for calculating the concentration corresponding to the quantified reference value using the previously generated concentration determination function
Concentration monitoring system comprising a.
According to claim 1,
The concentration calculation unit
Given a plurality of preset concentration values of the fluid and the quantification unit calculates the quantified reference values corresponding to the plurality of concentration values, respectively, use the plurality of concentration values and the respective quantified reference values corresponding thereto. To generate the concentration determination function.
According to claim 1,
The image analysis unit
And a gray value as the pixel value when performing the frequency analysis.
The method of claim 3, wherein
The image analysis unit
The first array, which is a one-dimensional array having pixel values of pixels belonging to the group for each group, is generated, and frequency analysis is performed on each element through a fast Fourier transform (FFT) to determine an FFT coefficient for each element. Generate an applied FFT coefficient array, wherein the second coordinate value is a one-dimensional array representing the difference in pixel values between adjacent pixels using the sum or average of the FFT coefficients of the same elements among the generated FFT coefficient arrays; Creates a,
The quantification unit
And summing the FFT coefficient values of the second arrays and outputting the FFT coefficient values as reference values for the concentration determination.
The method of claim 4, wherein
The quantification unit
When summing the values of the FFT coefficients of the second arrays, the density monitoring using the FFT coefficient values of the arrays corresponding to the medium frequency and the high frequency range among the low frequency, the medium frequency, and the high frequency of the second array are used. system.
The method of claim 5,
The quantification unit
Extracting arrays corresponding to half of the second arrays in which the frequency components are repeated in a symmetrical form, and calculating a reference value for the concentration determination using the FFT coefficient values of the extracted arrays Concentration monitoring system.
According to claim 1,
A concentration control unit which transmits a control signal to administer a substance for raising or lowering the calculated concentration value when the calculated concentration value falls below or exceeds a predetermined criterion;
Concentration monitoring system further comprising.
According to claim 1,
A user interface providing unit providing a user interface for setting a region of interest in the image photographed by the photographing means;
Contains more
The image analysis unit
And performing the frequency analysis on the ROI set by the user interface providing unit.
A method of measuring a concentration of a fluid without contacting the fluid with the fluid concentration measuring system,
(a) in the image photographed by the photographing means (having an MXN pixel and the coordinates of each pixel are represented by a first coordinate value and a second coordinate value), the first coordinate values are grouped by the same pixel among the coordinates of the pixels; A frequency analysis is performed on pixel values of pixels belonging to the group for each group, and the sum or average of the pixel values on which the frequency analysis is performed for each pixel having the same second coordinate value among the coordinates of the pixels on which the frequency analysis is performed. Calculating information to provide information indicating a difference between pixel values between adjacent pixels;
(b) quantifying the reference value for density determination using the difference in pixel values between adjacent pixels; And
(c) calculating a concentration corresponding to the quantified reference value using the previously generated concentration determination function;
Concentration monitoring method comprising a.
The method of claim 9,
Before step (a) above
Receiving a first predetermined concentration value of the fluid;
The first reference value, which is a quantified reference value corresponding to the first concentration value, is calculated through the steps (a) and (b) for the fluid, and the first concentration value and the first reference value are used as parameters. Generating a first reference point that comprises;
Receiving a second preset concentration value of the fluid;
The second concentration value and the second reference value are calculated as parameters by calculating a second reference value corresponding to the second concentration value through the steps (a) and (b) for the fluid. Generating a second reference point; And
Generating the concentration determination function using the first reference point and the second reference point;
Concentration monitoring method further comprising.
A computer program stored in a recorded medium comprising a series of instructions for carrying out the method according to any one of claims 9 and 10.

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