JPH0660867B2 - Flock image recognition device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flock image recognition device for measuring the state of flock in a flock formation pond (mixing pond), and is particularly suitable for always performing good flock observation. Flock image recognition device.

[Conventional technology]

FIG. 5 is a block diagram of the floc formation pond of the water purification plant. In the figure, 1 is a floc formation pond, 2 is a stirring paddle, 3
Is a straightening wall. The flocculation pond 1 is fed with a flocculating agent 10 in which the coagulant is injected into the raw water from the rapid mixing pond, and the average flow velocity of the flocculation pond 1 is 5 to 5 by the agitating paddle 2.
Stirring is performed at 50 cm / sec, and flocs 1 in flocculated water.
1 is formed, and the flocs 11 collide with each other and grow, and the particle size of the flocs 11 increases. The flock formation pond is usually composed of three ponds or four ponds and is divided by the pond wall 3. It is usually performed that strong agitation is applied in the initial stage where the particle size of the flocs 11 is small, and the agitation intensity is sequentially reduced as the flocs 11 grow larger.

In such a floc formation pond, it is necessary to observe the floc formation situation. Conventionally, this observation was performed visually by an inspector, but it is desired to automate this observation by a machine. As a conventional device for measuring this automation, for example, there is a floc measuring device described in Japanese Patent Laid-Open No. 54-143296. In this flock measuring device, an electric signal corresponding to the shape of the flock is taken out by using a photoelectric conversion device, and the electric signal is subjected to data processing.

[Problems to be Solved by the Invention]

In practical use, an apparatus for automatically observing the flock formation situation is to install a camera for capturing an image of the flock under the water surface of the flock formation pond shown in FIG. In the flock formation pond, innumerable flocs float in the water, so if these flocs adhere to the camera lens or observation window, it will be difficult to obtain only the image of the flocs floating in the water. There is. The above-mentioned conventional technique does not consider such a problem, and unless this problem is solved, automation of flock observation cannot be achieved.

It is an object of the present invention to provide a flock image recognition device that can always capture a flock image in a flock formation pond (mixing pond) in a good condition.

[Means for Solving the Problems]

The above-mentioned object has an observation window and a back screen arranged facing the observation window, and when converted into an electric signal for capturing an image of flock existing between the observation window and the back screen when installed in water. In a flock image recognition device having an image pickup means, a wiper having a thickness that suppresses turbulent flow of water that occurs when moving, and at least one of the water side surface of the observation window and the observation window side surface of the back screen. A wiper for removing dirt and a guide for restricting the movement of the end of the wiper on the side opposite to the drive shaft mounting side in a direction along the surface to bring the wiper into close contact with the surface during operation of the wiper. It is achieved by providing.

[Action]

In the present invention, the flocs adhering to the surface of the observation window (or the back screen. If the flocs adhere to the back screen, it becomes impossible to accurately obtain the image of the flocs floating in water like the adhesion of the flocs on the observation window). It is designed to be removed with a wiper. Moreover, if turbulence is generated when the wiper is moved, the floc will be destroyed,
The wiper is made thin to prevent turbulence from occurring. Furthermore, when the wiper is moved along the surface of the observation window, the end of the wiper rattles, which also causes turbulent flow to destroy the flock, or the wiper leaves the surface of the observation window to leave a portion of the flock left unwiped. However, in the present invention, the end of the wiper is pressed by the guide so as not to flutter.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention for recognizing a screen of a flock group in a flock formation pond 10. 20 is an airtight container,
21 is an observation window, 22A and 22B are ultra-thin wipers, 23 is a wiper drive device, 24 is a wiper drive shaft, and 25A and 25B.
Is a wiper guide, 26 is a back screen, 27 is a fixture, 30 is an industrial television camera (ITV), 31 is a close-up lens, 32 is an ITV controller, 40 is a lighting device,
41 is an illumination device controller, 50 is an image recognition device, 6
Reference numeral 0 is an image recognition control device, and 70 is a wiper control device.

The ITV 30 fixed in the airtight container 20 is a close-up lens 3
1. Observation window 21 made of transparent material such as glass
The screen of the flock 11 in the flock formation pond 1 is recognized through.

The back screen 26 is provided with a fixing member 27 on the airtight container 20 in order to accurately recognize the floc group with high contrast.
It is installed in front of the observation window 21 via.

The wiper drive device 23 is attached to the lower portion of the airtight container 20. The wiper drive shaft 24 on which the wiper drive device 23 rotates is provided so as to protrude by a length such that the tip reaches the back screen 26, and one end of the ultra-thin wiper 22B for the back screen is fixed to the tip. In the middle of the wiper drive shaft 24, one end of an ultra-thin wiper 22A for an observation window is fixed.

Each of the ultra-thin wipers 22A and 22B is a flat plate-shaped member,
Each plate surface is arranged so as to be in close contact with the surfaces of the observation window 21 and the back screen 26, respectively. With the rotation of the wiper drive shaft 24, the ultra-thin wipers 22A and 22B rotate about the shaft 24 as a rotation center point to wipe off dirt on the surfaces of the observation window 21 and the back screen 26. During this operation, the ultra-thin wipers 22A and 22B are provided on the opposite side of the rotation center point of each of the ultra-thin wipers 22A and 22B so that they do not float above the observation window 21 surface and the back screen 26 surface, respectively. A wiper guide 2 that moves the end portion while closely adhering to the surface of the observation window 21 and the surface of the back screen 26 even when the wiper is operating.
5A and 25B are provided on the observation window 21 and the back screen 26.

When the wipers 22A and 22B perform an operation of wiping off dirt, the plate thickness portions of the wipers 22A and 22B move in the direction of draining water. However, since the wipers 22A and 22B are very thin, the turbulent flow generated when the wipers 22A and 22B drain water is very small, and the flocs to be observed are not destroyed. Further, since the wiper guides 25A and 25B are provided, the wiper 2 can be operated while the wipers 22A and 22B are operating.
2A and 22B do not float up from the observation window 21 and the back screen 26, and the turbulent flow caused thereby can be avoided.

Further, the lighting device 40 is installed to constantly monitor the flocs, and controls the lighting conditions at appropriate times according to changes in the ambient illuminance.

The image area 80 (the portion indicated by diagonal lines) illuminated by the illuminating device 40 and taken into the ITV 30 and the close-up lens 31 is the object of observation, and the floc 1 that emerges due to the illumination.
1 is a clear image due to the high contrast with the back screen 26, and the ITV 3
It is taken into 0. The flock image information captured by the ITV 30 is transmitted to the image recognition device 50 via the ITV controller 32. The image recognition device 50 performs various calculations to extract information useful for water quality management of the water purification plant from the obtained image information.

The image recognition control device 60 controls the image recognition cycle, adjusts the recognition time and the number of times of recognition of the flock image information, and operates the illumination device 40 and the wiper drive device 23 associated with the image recognition. A command is given to the lighting device controller 41 and the wiper control device 70.

In response to a command from the image recognition control device 60, the wiper control device 70 operates the ultra-thin wipers 22A and 22B before the recognition operation to remove stains adhering to the observation window 21 and the back screen 26, and floats in the image area. Only allows you to recognize.

FIG. 2 is a view of the direction of the observation window 21 seen from the space between the observation window 21 and the back screen 26 shown in FIG. The flat plate-shaped ultra-thin wiper 22A receives a driving force from the wiper drive shaft 24 of the wiper drive device 23 and rotates about the wiper drive shaft 24 as a rotation center point. During this rotation, the wiper 22
The tip of A is regulated by the wiper guide 25A, and the tip always slides in close contact with the observation window 21. Along with this, the contact surface of the wiper 22A on the observation window side wipes off the dirt on the surface of the observation window 21. In the present embodiment, since the plate thickness of the wiper 22A is extremely thin, the wiper 22A is operated by the operation of the wiper 22A.
The turbulent flow generated by cutting the water in the plate thickness portion of A is very small, and the floc destruction due to this is avoided.

If the plate thickness of the wiper is reduced, the strength of the wiper decreases, but this decrease in strength can be dealt with by widening the width of the wiper. The shape of the wiper may be other wide shape. In the embodiment shown in FIG. 2, a flat plate-shaped wiper 22A having a rectangular plan view is used.
A diamond wiper 102 may be used as shown in the plan view on the left side of the figure, or a circular wiper 103 may be used as shown in the plan view on the right side of FIG. In this way, when using a wiper with a wide central portion, use this wiper as a cover for the observation window or back screen when image recognition is not performed, and the observation window or back screen in the covered portion is not stained. It is also possible not to adhere.

FIG. 3 is a longitudinal sectional view of the wiper 22A shown in FIG. 2 (from the rotation center point of the wiper 22A to the wiper guide 25A).
It is sectional drawing when it cut | disconnects in a side front-end | tip part direction. 100
Is a main body of the wiper 22A, and 101 is a member for wiping off dirt, which is provided on the wiper main body 100 on the observation window contact surface side. The main body 100 is made of metal or a chemical product, and the member 101 is made of rubber or a chemical product and a fiber.
It is made of a material that does not damage the observation window such as leather and can sufficiently remove dirt. By cleaning the observation window with such an ultra-thin wiper, the flocs floating in the image area can be clearly captured, and the flocs can be recognized with higher accuracy without causing the destruction of the flocs.

This means that the ultra-thin wiper 22 of the back screen 26
Similarly for B, by removing the dirt on the back screen, the flocs can be constantly raised with a high contrast and can be recognized accurately.

The wiper driving device may be mounted in the airtight container as long as consideration is given to the inflow of water, and the lighting device may be mounted in the airtight container. The wiper guide is not a strip-shaped one but may be any shape as long as it does not block the portion of the back screen 26 in the range of the observation window 21 and the image area 80 and assists the operation of the wiper 22.

〔The invention's effect〕

According to the present invention, the flock image in the process of forming the flock can always be recognized with high accuracy. Therefore, among various image calculations in the image recognition apparatus, there is no need for a correction calculation for flock destruction due to a turbulent flow, an impurity image removal calculation, and the like, so that the load is reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a view showing an observation window direction viewed from the region side of FIG. 1, FIG. 3 is a cross-sectional view of a wiper, and FIG. FIG. 5 shows another embodiment, and FIG. 5 is a schematic configuration diagram of a floc formation pond of a water purification plant. 11 ... Flock, 20 ... Airtight chamber, 21 ... Observation window, 22
A, 22B ... Ultra-thin wiper, 23 ... Wiper drive device, 2
4 ... Wiper drive shaft, 25A, 25B ... Wiper guide, 3
0 ... ITV, 50 ... Image recognition device, 60 ... Image recognition control device, 70 ... Wiper control device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Baba, 4026 Kuji Town, Hitachi City, Hitachi City, Ibaraki Prefecture 4026, Hitachi Research Institute, Ltd. (72) Shoji Watanabe, 4026 Kuji Town, Hitachi City, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory (56) Reference JP-A-60-260827 (JP, A) JP-A-61-111110 (JP, A) JP-A-61-217741 (JP, A)

Claims (1)

[Claims] 1. An electric signal that captures an image of a flock existing between the back window and the observation window when installed in water and has an observation window and a back screen facing the observation window. In a flock image recognition device having an image pickup means for converting, a wiper having a thickness that suppresses turbulent flow of water that occurs when moving, and at least the surface of the observation window on the water side or the surface of the back screen on the observation window side. A wiper for removing dirt on one side, and a guide for restricting the movement of the end of the wiper on the side opposite to the drive shaft mounting side in a direction along the surface to bring the wiper into close contact with the surface during operation of the wiper. A flock image recognition device provided with.