JP2003287489A - Flock imaging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flock imaging system which can clearly image a shape of a flock floating in a flock forming pond or a precipitation pond without collapsing the shape and which can alleviate a worker's working labor. <P>SOLUTION: This flock imaging system 1 comprises a specimen cell 3 having an interval slightly larger than a maximum flock diameter in a liquid and disposing two transparent plates 2a, 2b in parallel, a pump for introducing the flock of the flock precipitation pond into the cell 3, an image probe 10 for imaging the flock in the liquid introduced to the cell 3 via the plate 2a, and a sequence controller for controlling the pump and the probe 10. In this system, the pump is controlled to the optimum introducing speed so as to introduce the flock in a flock shape maintaining state, the introduced flock is imaged according to a predetermined sequence by the probe 10 to clearly image the flock shape in the precipitation pond without collapsing the shape. Further, the steps from a test water acquiring step to a flock shape confirming step is systematized to alleviate the worker's working labor and to accurately monitor the flock forming state. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flock photographing system for photographing a flocculation floc formed in a floc formation pond or a sedimentation pond of a water purification plant.

[0002]

2. Description of the Related Art In a water purification plant, in order to purify the raw water taken in, a floc formation pond is set up, and coagulants such as aluminum salts and auxiliary agents such as alkali agents are sprayed, and turbidity components mixed in the raw water By reacting with a coagulant to form coagulated flocs (hereinafter referred to as flocs), which is precipitated in a sedimentation tank and then removed, so-called coagulating sedimentation treatment is performed to obtain clear water.

However, if the amount of the flocculant or auxiliary agent applied is not suitable for the amount and the nature of the turbidity component, it is impossible to form flocs having a sufficient size effective for sedimentation, and it is cool. I can't get water.

Therefore, the operator of the water purification plant samples the sample water of the floc formation pond and the sedimentation pond several times a day, and adjusts the amount of the flocculant and the auxiliary agent by visually judging the size of the flocs and the sedimentation speed. Was there.

This is not only labor-intensive for the operator, but is also subject to visual judgment by the operator, which makes the criteria of judgment subjective and depends on experience and intuition. Further, when pumping up the test water with a pump or the like, the shape of the flock may be lost, and there is a problem that an accurate determination cannot be made.

For this reason, in recent years, it has been possible to immerse a TV camera in a floc formation pond or a sedimentation pond to photograph the natural state of the flocs, or to introduce a sample water into a sample cell provided in the television camera to photograph it. There has been proposed a method of subjecting the obtained image to image processing to make an objective determination.

[0007]

As described above, the method of immersing the TV camera in the floc formation pond and photographing the floc in a natural state is accurately influenced by the flow of water in the floc formation pond or the sedimentation pond. There is a problem that you can not shoot the shape of a flock.

Further, the background board is immersed in a floc formation pond,
There is also a method of shooting the flock that passes in front of this background board by immersing the TV camera in a predetermined distance from this background board, but in this case, the flock overlaps in the depth direction of the field of view of the background board and the TV camera. However, there is a problem that a measurement error occurs when the floc particle size is automatically measured.

As a method of coping with such overlapping of flocs, there is a method of introducing a test water into a thin cell and photographing with a television camera. There is a problem in that a perfect shape may be destroyed.

On the other hand, when the flock is photographed by the television camera through the transparent plate, stains due to long-term use are accumulated on the transparent plate, and the stains are added to the image as noise, so that the image is There is a problem that it is deteriorated and the flock shape cannot be accurately determined.

The present invention has been made in view of the above problems, and its first object is to prevent the shape of flocs floating in the water of a floc formation pond or sedimentation pond from destroying its natural shape. It is an object of the present invention to provide a flock monitoring system capable of clearly photographing and smoothly extracting feature of flock by image processing after photographing.

[0012] A second object is to reduce the work effort of the worker by systematizing the process from the water sample acquisition process for detecting the floc from the floc formation pond or the sedimentation pond to the floc formation confirmation process. An object of the present invention is to provide a flock photographing system capable of accurately monitoring the flock formation state.

[0013]

In order to achieve the above object, the present invention provides a specimen formed by arranging two transparent plates in parallel so as to have a gap slightly larger than the maximum flock diameter in the liquid. Introducing means, water collecting means for introducing a liquid containing flocs into the sample introducing means, imaging means for photographing the flocs in the liquid introduced into the sample introducing means through the transparent plate, and flock to the inside of the sample introducing means It is characterized in that it has a control means for controlling the water sampling means to the introduction optimal speed so as to be introduced in a state in which the shape is maintained and controlling the introduced floc to be photographed by the imaging means in accordance with a predetermined sequence. .

The present invention further comprises image processing means for image-processing the image picked up by the image pickup means to obtain the particle size distribution of flocs, and further stores sampled water which is connected to the sample introducing means. It also has a sampling tube that does. The control means controls the drainage of the test water accumulated in the sampling tube so as to intermittently discharge the sampled water at a high pressure at an interval longer than the imaging interval at which the imaging means takes an image.

Furthermore, the present invention has a chemical liquid injecting means for injecting a cleaning liquid for cleaning the transparent plate into the sampling tube, and the sample introducing means has a scraper for removing dirt adhering to the inner surface of the transparent plate. is doing. The control means performs control so that the transparent plate and the scraper reciprocate with a slight gap maintained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Structure) FIG. 1 is a diagram showing the structure of a flock photographing system 1 according to an embodiment of the present invention.

In this flock photographing system 1, two transparent plates 2a and 2b are arranged in parallel and a sample cell 3 formed so as to have a gap slightly larger than the maximum flock diameter in the liquid, and a sample cell 3 A pump portion for introducing a liquid containing flocs, an image probe 10 for photographing the flocs in the liquid introduced into the sample cell 3 through the transparent plate 2a, and a state in which the shape of the floc is maintained up to the inside of the sample cell 3. The main point is to have a sequence control unit 40 that controls the pump unit to the optimum introduction speed so as to be introduced in 1. and controls the image probe 10 to capture an image of the introduced floc according to a predetermined sequence.

FIG. 2 is a diagram showing a specific configuration of the image probe 10 provided in the flock photographing system 1.

The image probe 10 is an airtight imaging container 1.
4 and the inside of the illumination container 22, various devices are respectively housed, the sample cell 3 is provided between the imaging container 14 and the illumination container 22, and these are tightly fastened and integrated.

A transparent plate 2a is formed on the bottom of the image pickup container 14, and the zoom lens 1 is provided inside the image pickup container 14.
The CCD camera 11 to which 2 and the close-up lens 13 are attached is fixed so as to photograph the inside of the sample cell 3.

The transparent plate 2 is provided on the upper part of the lighting container 22.
b, the dark field optical system 23 and the halogen lamp 21 for illumination are sequentially provided inside the illumination container 22, and the irradiation light of the halogen lamp 21 is dark field optical system 23.
It is fixed so as to illuminate the inside of the sample cell 3 through the gap.

The sample cell 3 is a space formed by being sandwiched between a transparent plate 2a provided in the image pickup container 14 and a transparent plate 2b provided in the illumination container 22, and one end thereof has an opening (a water sampling port 4). It is connected to the sedimentation pond. The other end is connected to one end of the sampling tube 7.

The other end of the sampling tube 7 is closed, and a water level detector 6 for detecting the upper limit water level is attached inside. Further, inside the sampling pipe 7, a flow rate detector 5 for measuring the introduced amount of test water is provided.

The thickness of the sample cell 3 is slightly larger than the maximum flock diameter so that the flocs do not overlap each other on the captured flock image. A scraper 8 connected to an air cylinder 9 is provided inside the sample cell 3, and the inner surface of the transparent plates 2a and 2b and the scraper 8 are provided.
The outer surface of is reciprocally moved with a slight gap maintained so that it does not contact.

FIG. 3 is a view showing an AA cross section of the sample cell 3 provided in the image probe 10.

As shown in FIG. 3, the water sampling port 4 of the sample cell 3
The inlet angle is widened so that it can be introduced in a natural state without breaking the shape of the flock. A scraper 8 is provided inside the sample cell 3, and the tip of the scraper 8 has a curved shape so that the sampled water can smoothly flow into the sampling tube 7. The portion surrounded by the dotted line in the figure is the CCD camera 1
1 shows the inspection visual field 24.

Returning to FIG. 1, the pump portion is the air pump 30.
, Pressure reducing valves 31, 32, chemical liquid injection unit 33, positive pressure tank 34, negative pressure tank 35, and valves V1 to V7.
It has and.

The air pump 30 is connected to a positive pressure tank 34 and a negative pressure tank 35 via valves V1 and V2, respectively, and produces positive pressure and negative pressure, respectively.

The positive pressure tank 34 includes a valve V3 and a pressure reducing valve 3.
It is connected to the upper end portion of the sampling tube 7 via 1. Air is blown to the sampling tube 7 by opening the valve V3. The positive pressure tank 34 is connected to the air cylinder 9 via a valve V4 and a valve V5, and the valves V4 and V5 are alternately opened to reciprocate the scraper 8 connected to the air cylinder 9.

The negative pressure tank 35 includes a valve V6 and a pressure reducing valve 3.
It is connected to the upper end portion of the sampling tube 7 via 2. Air is sucked into the sampling tube 7 by opening the valve V6.

The chemical injection unit 33 is connected to the sampling tube 7 via a valve V7. The chemical liquid injecting unit 33 has a cleaning liquid tank containing a cleaning liquid such as zinc and a pump incorporated therein. The cleaning liquid is injected into the sampling tube 7 by opening the valve V7.

The sequence control unit 40 has a memory in which a valve opening / closing sequence for operating the flock photographing system 1 automatically or manually is preliminarily stored. Upon receipt of a command from the image analysis PC 50, the sequence control unit 40 operates automatically or manually. Control is performed by switching the operation mode.

Further, the sequence control unit 40 includes electric valves V1 to V7, an air pump 30, pressure reducing valves 31, 32, and
Flow rate detector 5 of sampling tube 7, water level detector 6, CC
It is connected to the D camera 11, the image analysis PC 50 in the driver's cab, etc., controls the valves V1 to V7 and the air pump 30, sets the air flow rate by adjusting the pressure reducing valves 31, 32, reads the water level from the water level detector 6, and takes an image. Timing output, focus adjustment of the zoom lens 12, transmission of status, etc. are performed.

The sequence controller 40, the air pump 30, the positive pressure tank 34, the negative pressure tank 35, the valves V1 to V1.
The V7, the pressure reducing valves 31 and 32, and the chemical liquid injection unit 33 are housed in the site operation panel and installed near the sedimentation tank.

The image analysis unit PC50 is a keyboard, CP
It is a general personal computer including a U, a memory, a disk, and the like, and has a function of performing image analysis on the acquired image and displaying the analyzed image on the monitor 51.

From the image analysis PC 50, the operator switches the operation mode and operates the manual operation via the keyboard, checks the status of the flock photographing system 1, adjusts, observes the image and checks the analysis result. Can be done.

(Operation) Next, the operation will be described with reference to the sequence diagram of the flock photographing system 1 according to the embodiment of the present invention in FIG. In addition, the frock photography system 1
Although manual operation and automatic operation can be selected, only automatic operation will be described in the present embodiment. Further, as a premise, the image probe 10 is submerged to a depth such that the water sampling port 4 does not reach the surface of the water even when the water level of the floc formation pond or the sedimentation pond changes.

First, when the sequence control unit 40 receives a photographing start signal from the keyboard of the image analysis PC 50,
A valve opening signal is output to the valve V6. Valve V6
Receives the valve opening signal, opens the valve V6 and connects the negative pressure tank 35 so that the air in the sampling tube 7 can be sucked.

With the opening of the valve V6, when the air in the sampling tube 7 begins to flow into the negative pressure tank 35, the water in the sedimentation tank is introduced from the water sampling port 4 into the sample cell 3 through the sampling tube 7.

The sequence control unit 40 successively monitors the flow rate value of the flow rate detector 5, and when detecting that a predetermined amount of water has been introduced, outputs a closing signal for closing the valve to the valve V6. .

Water collection is stopped by closing the valve V6, and the flocs introduced into the sample cell 3 are made to float. When the sequence control unit 40 detects that the floc is floating, the sequence control unit 40 outputs a flock photographing start signal to the CCD camera 11. The CCD camera 11 captures a flock image clearly emerging on the dark-field optical system 23 by indirect illumination via the transparent plate 2a, and transmits the captured flock image to the image analysis PC 50.

The image analysis PC 50 performs predetermined image processing, outputs the obtained floc size and particle size distribution measurement result to the monitor 51 and stores it in the memory. The image analysis method will be separately described in detail below.

The sequence control unit 40 again outputs an opening signal to the valve V6 to perform a new floc inspection,
The above water sampling and photographing are repeated. When the water is sampled for the second time and thereafter, the flocs sampled last time are transferred to the sampling pipe 7, and the water level in the sampling pipe 7 rises.

When the water sampling is repeated a predetermined number of times or until the water level of the sampling pipe 7 reaches the upper limit value, a valve opening signal is output to the valve V3 and the sampling pipe 7 and the positive pressure tank 36 are connected to each other. Air is blown into the sample tube 7, and the test water accumulated in the sampling tube 7 is discharged from the water sampling port 4 through the sample cell 3.

At the time of this discharge, the pressure of the pressure reducing valve 31 is set to be high and the water is discharged vigorously, so that the flocs adhering to the inside of the sampling tube 7 and the inside of the sample cell 3 are washed away with the fumes.

At the time of this discharge, a basic sequence with chemical cleaning may be added to this basic sequence from time to time. Here, the basic sequence with chemical cleaning means that the valve V7 is opened for a predetermined time before the accumulated water in the sampling pipe 7 is drained, the cleaning liquid is injected into the sampling pipe 7, and the water containing this cleaning liquid is introduced. The inner surface of the sample cell 3 can be washed at the same time when the water is drained.

Further, during this discharge, the valves V4 and V5 are alternately opened and the scraper 8 is reciprocally moved to generate vortices between the transparent plates 2a, 2b and the scraper 8 to remove the stuck dirt. If you take it, you can wash it more carefully.

The basic sequence with chemical cleaning may be a cleaning-only sequence. That is, the sequence for exclusive use of cleaning means that the valve V6 is opened to introduce a predetermined amount of water into the sampling pipe 7, the valve V6 is closed, and then the valve V7 is opened to inject the cleaning liquid to open the valve V3. This is a method of cleaning the inside of the sample cell 3 by alternately opening the valves V4 and V5 and reciprocating the scraper 8 while draining.

The above is the basic sequence, and this is repeated to continue capturing images.

In the present embodiment, the valve V6 is opened / closed based on the flow rate per unit time of the flow rate detector 5 in order to introduce it into the sample cell 3 while maintaining the flock shape. Although the open / close control method is not limited to this, the open / close control may be performed using a timer, for example. That is, "the optimum floc introduction speed" that can be introduced into the sample cell 3 while maintaining the flock shape is measured in advance, and the optimum flock introduction speed is converted into the decompression amount of the pressure reducing valves 31, 32, The pressure reducing dials of the pressure reducing valves 31 and 32 are controlled. At the time of implementation, this reduced pressure amount may be made into a function and incorporated into the sequence.

Next, specific image processing will be described with reference to the image processing flowchart of FIG.

First, in step S10, the sequence controller 40 outputs a photographing start signal to the CCD camera 11,
Take a picture of the shape of a flock in a stationary state. The captured image data for one frame is stored in the image memory of the image analysis PC 50.

In step S20, the image analysis PC 50
The image data stored in the image memory is read, the image data is subdivided into a predetermined area size, and in the subdivided area, a narrow area (for example, an area composed of 3 × 3 9 pixels) In order to subtract the influence of light and dark (noise component etc.), smoothing processing by spatial filtering is performed.

In step S30, the smoothed image data is calculated as the brightness difference between the upper and lower pixels and the left and right pixels with respect to the target pixel (center pixel), and this is calculated over the entire screen.

In step S40, the calculated luminance difference is compared with the reference luminance difference, and a pixel portion having a predetermined value or more is judged as a floc edge portion and extracted. This edge processing is not so-called binarization processing, but a difference between adjacent pixels of brightness obtained from image data is obtained, and this difference is compared with a reference brightness difference, and if it is a predetermined value or more, it is determined as an edge. With this processing, the flock edge is accurately extracted regardless of the brightness of the background.

In step S50, the extracted edges may be cut off in a portion having a small difference in brightness, so line segment connection processing by filtering processing is performed to connect the cut portions.

In step S60, the process of filling the portion surrounded by the closed loop is performed by the line segment connection process. The filling process fills the inside of the closed loop surrounded by the closed loop with, for example, “1”.

In step S70, labeling processing is performed on the image subjected to the padding processing, and a unique number is given to each flock image. In addition, the area of the flock is calculated from the number of pixels of the image in which the closed loop is filled by the hole filling process.

In step S80, the floc area calculated in step S70 is converted into a circle to calculate the floc diameter, and the particle size distribution (frequency distribution with respect to diameter) per unit area in the sampled sedimentation basin is calculated. To do.

In step S90, the calculated particle size distribution is output to the monitor 51 and also stored in the memory. As a result, the operator can monitor the transition and the current state of the particle size distribution from the image analysis PC 50.

(Effect) The shape of the flocs floating in the water of the floc formation pond or the sedimentation pond is clearly photographed without destroying its natural shape, and the feature extraction of the flocs by the image processing after the photographing is performed. It can be done smoothly.

By systematizing the process from the water sample acquisition process for detecting flocs from the floc formation pond or sedimentation pond to the floc formation confirmation process, the work effort of the worker is reduced and the floc formation state is accurately monitored. be able to.

Therefore, according to the present embodiment, in the basic sequence of the automatic operation, the sequence control unit 40 successively monitors the flow rate detector 5 and introduces it into the sampling pipe 7 when collecting water from the sedimentation tank. Pressure reducing valve 3 depending on the flow rate
By adjusting the depressurization amount of 2 and setting the air flow rate so that water is sampled sufficiently slowly, it is possible to monitor in a natural state without destroying the shape of the floc.

Further, at the time of water sampling, the inlet angle of the water sampling port 4 is widened so that the flow is not disturbed and the flow is smoothly introduced, and the tip of the scraper 8 is also curved so that the floc shape is introduced without being destroyed. be able to.

Further, by stopping the water collection after the water collection and allowing the water introduced into the sample cell 3 to stand still, the shape of the flock can be clearly photographed. In addition, the dark field optical system 23
By using, the flock image can be made to stand out on the black background plate by indirect illumination, so that the flock shape can be photographed more clearly.

Further, by making the thickness of the sample cell 3 a little larger than the maximum flock diameter, it is possible to prevent the flocs from overlapping with each other and to accurately obtain the particle size distribution in the sedimentation tank.

It should be noted that, at the time of draining, the water accumulated in the sampling pipe 7 can be vigorously discharged by adjusting the air flow rate by the pressure reducing valve 31 in advance so that the water is drained sufficiently quickly. The flocs adhering to the inside of the sampling tube 7 and the inside of the sample cell 3 can be washed away with a gas cleaning.

Further, in the automatic operation basic sequence with chemical cleaning or the exclusive cleaning sequence, the cleaning liquid is injected into the sampling tube 7 and drained through the sample cell 3 so that the sampling tube 7 and the sample are drained. The cleaning effect of the cell 3 can be enhanced, and further, the reciprocating movement of the scraper 8 can generate a vortex between the transparent plates 2a, 2b and the scraper 8 to remove the dirt attached to the transparent plates 2a, 2b. Therefore, the cleaning effect can be further enhanced.

Furthermore, in the image processing, the brightness difference between the pixel above and below and the pixel to the left and right with respect to the pixel of interest is calculated over the entire screen, and the part where the brightness difference is a certain value or more is extracted as the edge part of the floc. Therefore, even if the background brightness changes, the particle size distribution can be obtained by accurately recognizing the flock shape (area).

(Modification) In the above-described embodiment of the present invention, the operation of the basic sequence can be variously modified. For example, the combination of the reciprocating movement of the scraper 8 and the injection of the cleaning liquid can be appropriately changed.

Specifically, in the above embodiment,
In the operation according to the basic sequence, the method of performing the cleaning by vigorously discharging the water from the sampling pipe 7 is implemented, but the same effect can be obtained even if the scraper 8 is operated at the same time to perform the cleaning. You can

In the above-described embodiment of the present invention,
In the basic sequence with chemical cleaning, after the sample water in the sample cell 3 has been taken, the sample water is introduced into the sampling tube 7 to accumulate a predetermined amount, and then the cleaning solution is injected into the sampling tube 7 for draining the scraper. Although the inside of the sample cell 3 is cleaned by moving the sample 8 back and forth, whether or not to inject the cleaning liquid can be selected.

Further, each mechanism can be variously modified.
For example, by arranging a plurality of sets of the pressure reducing valve 32 and the valve V6 in parallel, and by controlling the sequence control unit 40 to select the opening of each valve and adjust the air flow rate supplied to the sampling pipe 7, the water sampling rate. Since it can be switched at a finer stage, it can be introduced into the sample cell 3 while maintaining the flock shape as in the above-mentioned embodiment.

[0075]

According to the present invention, the shape of a floc floating in a floc formation pond or a sedimentation pond can be clearly photographed without destroying its natural shape, and the flocculation by image processing after photographing can be performed. It is possible to provide a flock photographing system that can smoothly perform feature extraction.

Further, according to the present invention, by systematizing from the water sample acquisition step to the flock formation confirmation step, the work effort of the worker can be reduced and the flock formation state can be accurately monitored. An imaging system can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a flock photographing system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration of an image probe provided in the flock imaging system according to the embodiment of the present invention.

FIG. 3 is a diagram showing an AA cross section of a sample cell provided in the image probe according to the embodiment of the present invention.

FIG. 4 is a sequence diagram of the flock photographing system according to the embodiment of the present invention.

FIG. 5 is a flowchart showing image processing steps of the flock photographing system according to the embodiment of the present invention.

[Explanation of symbols]

1 Flock shooting system 2a, b transparent plate 3 sample cells 4 Water sampling port 5 Flow rate detector 6 Water level detector 7 sampling tube 7 8 scrapers 9 Air cylinder 10 Image probe 11 CCD camera 12 zoom lens 13 Close-up lens 14 Imaging container 21 light source 22 Lighting container 23 Darkfield optical system 24 Inspection field of view 30 air pump 31, 32 Pressure reducing valve 33 Chemical injection unit 34 Positive pressure tank 35 Negative pressure tank 40 Sequence control unit 50 Image analysis PC 51 monitor

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) G01N 21/15 G01N 21/15 21/17 21/17 A 33/18 106 33/18 106A (72) Invention Norikazu Kurihara 2-24-24 Harumi-cho, Fuchu-shi, Tokyo TOSHIBA IT Control System Co., Ltd. (72) Inventor Kiichiro Uyama 1-24-2 Harumi-cho, Fuchu-shi, Tokyo TOSHIBA IT Control system stock In-house (72) Inventor Koichi Isoda 1-24-2 Harumi-cho, Fuchu-shi, Tokyo Toshiba IT control system stock In-company (72) Inventor Ryosuke Miura 1-1-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo No. 6 In Toshiba Techno Consulting Co., Ltd. (72) Inventor Gitaro Iyasu No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Fuchu Works (72) Inventor Takeshi Otsuka 1st Toshiba Town, Fuchu City, Tokyo F-Term (Fu), Fuchu Works, Toshiba Corporation (Reference) 2F065 AA26 BB05 DD11 FF04 GG02 HH16 JJ03 JJ26 LL06 QQ24 QQ31 QQ32 QQ33 SS13 2G057 AA02 AB AC01 AC06 BA01 BB01 JA01 2G059 AA05 BB04 BB06 BB09 CC19 DD12 FF01 GG10 JJ11 KK04 MM01 MM02 MM05 MM10 PP04

Claims (6)

[Claims] 1. A sample introducing means formed by arranging two transparent plates in parallel with each other so as to have a gap slightly larger than the maximum flock diameter in the liquid, and a liquid containing flocs is introduced into the sample introducing means. Water collecting means, imaging means for photographing the flocs in the liquid introduced into the sample introducing means through the transparent plate, and introducing the sample into the inside of the sample introducing means while maintaining the shape of the flocs. And a control means for controlling the water sampling means to an optimum introduction speed and controlling the introduced flock to be imaged by the imaging means in accordance with a predetermined sequence. 2. The flock photographing system according to claim 1, further comprising image processing means for performing image processing on an image picked up by the image pickup means to obtain a particle size distribution of the flock. 3. A sampling pipe connected to the sample introducing means for accumulating the sampled sampled water, wherein the control means controls the sampled water accumulated in the sampling tube to be discharged at a high pressure. The flock photographing system according to claim 1, wherein the transparent plate is washed. 4. The flock photographing system according to claim 3, wherein the sampling tube has a chemical liquid injecting means for injecting a cleaning liquid for cleaning the transparent plate. 5. The sample introducing means has a scraper for removing dirt adhering to the inner surface of the transparent plate, and the control means holds a slight gap between the transparent plate and the scraper. The flock photographing system according to any one of claims 1 to 4, wherein the flock photographing system is controlled so as to reciprocate in a state. 6. The predetermined sequence is a sequence in which the introduction of a liquid into the sample introducing unit, the stop of the introduction, and the imaging of the flocs in the liquid during the stop are repeatedly performed. The flock photographing system according to any one of claims 1 to 5.