JPH02229596A - Method for recognizing image of activated sludge - Google Patents

Method for recognizing image of activated sludge

Info

Publication number
JPH02229596A
JPH02229596A JP1049785A JP4978589A JPH02229596A JP H02229596 A JPH02229596 A JP H02229596A JP 1049785 A JP1049785 A JP 1049785A JP 4978589 A JP4978589 A JP 4978589A JP H02229596 A JPH02229596 A JP H02229596A
Authority
JP
Japan
Prior art keywords
activated sludge
stage
image
flocs
processing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP1049785A
Other languages
Japanese (ja)
Other versions
JPH0671598B2 (en
Inventor
Kazuyuki Suzuki
鈴木 一如
Yuichi Usami
宇佐見 雄一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Ebara Research Co Ltd
Original Assignee
Ebara Research Co Ltd
Ebara Infilco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebara Research Co Ltd, Ebara Infilco Co Ltd filed Critical Ebara Research Co Ltd
Priority to JP1049785A priority Critical patent/JPH0671598B2/en
Publication of JPH02229596A publication Critical patent/JPH02229596A/en
Publication of JPH0671598B2 publication Critical patent/JPH0671598B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Landscapes

  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Activated Sludge Processes (AREA)
  • Image Processing (AREA)

Abstract

PURPOSE:To quantitatively evaluate the denseness of activated sludge flocs and to execute the stable operation control of an activated sludge process by subjecting the magnified images of the above-mentioned flocs to a prescribed image arithmetic processing. CONSTITUTION:The denseness of the activated sludge flocs is decided by executing the image arithmetic processing consisting of a 1st stage 23 in which the activated sludge is macrophotographed and the difference between the brightness value of original image data 21 and the brightness value of the background image data 22 is computed, a 2nd stage 24 in which the image obtd. in the 1st stage is subjected to a binarization processing by the plural luminance values, a 3rd stage 25 in which the plural images obtd. in the 2nd stage are subjected respectively to a reduction processing and a magnification processing, a 4th stage 26 in which the area or volume of the activated sludge flocs in the image obtd. in the 3rd stage is computed and 5th stages 27, 28 in which the ratio to the max. value among the plural computed values obtd. in the 4th stage is computed for each of these values.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、活性汚泥の画像認識方法に係り、特に、下水
処理等、で活性汚泥法を用いて、排水を浄化処理する設
備において、曝気槽中の活性汚泥の性状を認識評価する
画像認識処理方法に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image recognition method for activated sludge, and is particularly applicable to equipment that purifies wastewater using the activated sludge method in sewage treatment, etc. The present invention relates to an image recognition processing method for recognizing and evaluating the properties of activated sludge in a tank.

〔従来の技術〕[Conventional technology]

活性汚泥法は、下水処理等の広い分野で活用されている
水処理プロセスである。該方法を実施するための要件は
、酸素仔在下で微生物による有機汚濁物質の分解、同化
反応の確保と、生成した活性汚泥フロックの効果的な沈
殿分離の確保にあるが、前記の反応条件の変動によって
は必ずしも、良好な沈殿分離が確保し得ない局面が広々
にして起こり、従来運転管理が比較的鑓しい水処理プロ
セスの1つとされてきた。
The activated sludge method is a water treatment process that is used in a wide range of fields such as sewage treatment. The requirements for implementing this method are to ensure the decomposition and assimilation reaction of organic pollutants by microorganisms in the presence of oxygen, and to ensure effective sedimentation and separation of the generated activated sludge flocs. Due to fluctuations, there are many situations in which it is not always possible to ensure good precipitation and separation, and conventionally it has been considered one of the water treatment processes in which operation management is relatively difficult.

良好な沈殿分離を確保するためには、生成した活性汚泥
フロックが、稠密で粒径の大きな、即ち沈降速度の大き
なものである必要がある。
In order to ensure good sedimentation separation, the generated activated sludge flocs need to be dense and have a large particle size, that is, have a high settling rate.

従来、総括的(マクロ的)には、SVI等の指標を用い
て沈降性の評価を行い、運転管理のための情報としてき
九。しかし、SV工の指標そのものが手分析操作による
ものであつ九ため、リアμタイム性に欠けるものである
上、その数値についても、明確な閾値がある訳ではなく
、沈殿分離の良否との対応には経験的判断の介在を必要
とするなど、自動化・オンフイン化しにくい性格を持っ
ていた。
Conventionally, from a comprehensive (macro) perspective, indicators such as SVI have been used to evaluate sedimentation, and have been used as information for operation management. However, the indicators for SV engineering are based on manual analysis and lack real-time performance. Furthermore, there is no clear threshold value for the numerical value, and it does not correspond to the quality of sedimentation separation. It has characteristics that make it difficult to automate or turn it into an online system, such as requiring the intervention of empirical judgment.

こうした背景から、近年、活性汚泥のMti&鏡等によ
る拡大影像を、テレビカメフにより画象処理装置にと9
込み、処理を行って活性汚泥に関するミクロ的な情報を
得ようとする試みがみられる様になってきた。しかし、
これらは、一方では原生動物のg識計数であったシ、他
方では沈降性を妨害する糸状細菌の認識計数であり、活
性汚泥フロックそのものの稠密性を取り扱うものではな
かった。
Against this background, in recent years, enlarged images of activated sludge using Mti and mirrors have been converted into image processing equipment using TV cameras.
Attempts are now being made to collect and process activated sludge to obtain microscopic information about activated sludge. but,
These were, on the one hand, a recognition count of protozoa, and on the other hand, a recognition count of filamentous bacteria that interfered with sedimentation, and did not deal with the density of the activated sludge floc itself.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上記のように、従来技術においては、活性汚泥フロック
の稠密性を取シ扱う技術は開発されていなかった。
As mentioned above, in the prior art, no technology has been developed to deal with the density of activated sludge flocs.

そこで、木発明は、活性汚泥フロックの稠密性を定量化
して評価し、活性汚泥フロックの安定した運転制御を可
能とするための画像認識方法を提供することを目的とす
る。
Therefore, the object of the present invention is to provide an image recognition method for quantifying and evaluating the density of activated sludge flocs and enabling stable operation control of activated sludge flocs.

〔課題を解決するための手段〕[Means to solve the problem]

木発明者らは、沈殿分離を支配する因子は、糸状細菌の
量だけでなく、活性汚泥フロックそのものの稠密性にも
あるとの見解のもとに、鋭意研究の結果、稠密性を定址
的に表現し得る、新規な画像認識処理方法を発明し、上
記の目的を達成したものである。
Based on the idea that the factor governing sedimentation separation is not only the amount of filamentous bacteria, but also the density of the activated sludge flocs themselves, the inventors conducted extensive research and determined that the density can be determined in a fixed manner. This invention has achieved the above objectives by inventing a new image recognition processing method that can be expressed as follows.

すなわち、本発明は、 活性汚泥を拡大撮象し、画像処理する方法において、 (1)  !X11m像データの輝度値と背景画象デー
タの輝度値の差t−演算する第1の工程と、(2)  
第1の工程で得られた画像を複数のり度値で2値化処理
する第2の工程と、 (3)  第2の工程で得られた復数の固象を、各々縮
小熟埋及び拡大処理する第3の工程と、(4)  第3
の工程で得られた画家中の活性汚泥フロックの面積又は
体積を演算する第4の工程と、 (5)第4の工程で得られた複数の演算値の各々につい
て、それらのうちの最大迫との比率を演算する第5の工
程と (6)  第5の工程で得られた演算値により活性汚泥
フロックの稠密性を判定する第6の工程とからなること
を特畝とする活性汚泥の画1象認識方法である。
That is, the present invention provides a method for enlarging activated sludge and processing the image, (1)! a first step of calculating the difference t between the brightness value of the X11m image data and the brightness value of the background image data; (2)
a second step in which the image obtained in the first step is binarized using a plurality of intensity values; (3) the multiple solid objects obtained in the second step are reduced and enlarged respectively (4) a third step of treating;
a fourth step of calculating the area or volume of the activated sludge flocs in the painter obtained in step (5) of each of the plurality of calculated values obtained in the fourth step; and (6) a sixth step of determining the density of the activated sludge flocs based on the calculated value obtained in the fifth step. This is a one-image recognition method.

上記において、活性汚泥とは、フロック形成細菌、糸状
細菌及び原生動物等で形成されたものを総称するもので
、フロック形成細菌によって形成されたフロック伏の対
象物を活性汚泥フロックといい、独立遊離あるいはフロ
ックから放射状にのびている糸状の対象物を糸状細菌と
いい、本発明では活性汚泥フロックを定凰的に認識する
ものである。
In the above, activated sludge is a general term for those formed by floc-forming bacteria, filamentous bacteria, protozoa, etc., and the objects of floc formation formed by floc-forming bacteria are called activated sludge flocs, and Alternatively, filamentous objects extending radially from flocs are called filamentous bacteria, and the present invention recognizes activated sludge flocs in a fixed manner.

〔作用〕[Effect]

本発明にかかる画像認識方法は、下水処理等の活性汚泥
プロセスにより生成する活性汚泥フロックの拡大影象を
、所定の画像演算処理を施すことによって、その稠密性
を定量化し、評価して活性汚泥フロックの良否を診断し
、もって効果的な運伝管理、自動制岬を可能ならしめる
作用をなす。
The image recognition method according to the present invention quantifies and evaluates the density of activated sludge flocs by performing predetermined image calculation processing on an enlarged image of activated sludge flocs generated in an activated sludge process such as sewage treatment. It diagnoses the quality of flocks, thereby enabling effective transport management and automatic control.

〔実施例〕〔Example〕

以下、本発明を図面を参照にして更に詳しく説明するが
、本発明はこの実施例に限定されるものではない。
Hereinafter, the present invention will be explained in more detail with reference to the drawings, but the present invention is not limited to this embodiment.

最初に第1図を用いて説明する。第1図は、本発明に係
わる活性汚泥の画像認識処橿方法の運用例を示す説明図
である。
First, explanation will be given using FIG. FIG. 1 is an explanatory diagram showing an example of operation of the image recognition processing method for activated sludge according to the present invention.

原水1は必要ならば前処理を受けた後、@気槽2に導入
され、ここで、沈殿池4から返送された活性汚泥12と
混合される。曝気槽2内には、活性汚泥の活動に必要な
酸素を供給するため、プロワー5よシ空気が供給されて
いる。活性汚泥は曝気槽中に滞留する間に排水中の有機
物質を分解資化する。曝気槽2からの流出水は沈殿池4
に送られ、ここで活性汚泥を沈殿分離して、清溌な処理
水7を得る。沈殿した活性汚泥の一部は返送汚泥12と
なシ、残部は余剰汚泥13として糸外に排出される。
After undergoing pretreatment if necessary, the raw water 1 is introduced into the @air tank 2, where it is mixed with the activated sludge 12 returned from the settling tank 4. Air is supplied into the aeration tank 2 by a blower 5 in order to supply oxygen necessary for activated sludge activity. Activated sludge decomposes and assimilates organic substances in wastewater while it remains in the aeration tank. The water flowing out from the aeration tank 2 is sent to the sedimentation tank 4.
The activated sludge is sent there to be separated by precipitation to obtain clean treated water 7. A part of the precipitated activated sludge becomes return sludge 12, and the rest is discharged to the outside as surplus sludge 13.

曝気槽2中には活性汚泥の拡大影象を得るのに好適な水
中顕微鏡8が浸漬されていて、定期的に活性汚泥の影像
を把え、本発明に係るVR像認識システム9へ送信して
いる。この水中頭漱IM8としては、例えば、本出願人
が先に出願した特願昭62−279056号に記載のよ
うな、この目的に適した装置が選定される。
An underwater microscope 8 suitable for obtaining enlarged images of activated sludge is immersed in the aeration tank 2, and periodically captures images of the activated sludge and transmits them to the VR image recognition system 9 according to the present invention. ing. As this underwater head IM8, a device suitable for this purpose is selected, for example, as described in Japanese Patent Application No. 62-279056 previously filed by the present applicant.

画@!g識処理ンステム9は、画家演算処理装置、コン
ピュータ、モニタ、テレビ等から構成され、水中頭微虞
8からの映1家信号に必要な演算処理を施し、活性汚泥
フロックの稠密性を評価判定する指標を算出する。該シ
ステム9での演算結果はコントローラ10を介して伝達
され、必要に応じて、曝気プロワー3、返送汚泥ボンデ
5、余剰汚泥ポンプ6が制御される。
Picture @! The g-identification processing system 9 is composed of a painter processing unit, a computer, a monitor, a television, etc., and performs the necessary calculation processing on the video signal from the underwater head unit 8, and evaluates and determines the density of activated sludge flocs. Calculate the index for The calculation results in the system 9 are transmitted via the controller 10, and the aeration blower 3, return sludge bonder 5, and excess sludge pump 6 are controlled as necessary.

次に、第2図の本発明の画像認識処理方法のフローの一
例を示す工程図を用いて、画像認識システム9における
画像データの処理手j頃について説明する。
Next, the processing of image data in the image recognition system 9 will be explained using a process diagram showing an example of the flow of the image recognition processing method of the present invention shown in FIG.

水中顕YIk鏡8からの原画像データ21は、必要なら
ば複数回の積分入力により平滑化された後、入力画像の
照明ムツ等を除去するため、対象物を含まない背景画像
データ22との間で、対応する画素間の輝度値の差を演
算23する。
The original image data 21 from the underwater YIk mirror 8 is smoothed by multiple integral inputs if necessary, and then combined with the background image data 22 that does not contain the object in order to remove illumination artifacts from the input image. The difference in luminance values between corresponding pixels is calculated 23 between them.

(第1の工程)第1の工程で得られた画像を対象とする
活性汚泥フロックの輝度値の分布を考慮して、あらかじ
め設定されている複数の輝度値で2値化処理24する。
(First step) The image obtained in the first step is subjected to binarization processing 24 using a plurality of preset brightness values in consideration of the distribution of brightness values of activated sludge flocs.

(第2の工程)この輝度値の設定は、当該活性汚泥の輝
度値の分布に関する知見から任意に設定して良い。
(Second step) The brightness value may be set arbitrarily based on knowledge regarding the distribution of brightness values of the activated sludge.

例えば、対象とする活性汚泥フロックについて最大径を
算出し、その最大径方向に沿って走査して得られる輝度
値分布から、最大輝度値、最小輝度値を求め、その最大
輝度値、最小輝度値及びその間の少なくとも1つの輝度
度として設定することが好ましい。これにより、2値化
処理の揮度値の異なる複数の2値化画像が得られる。(
第2図では4つの例を示している。)この複数の2m化
画像A−Dの各々について、糸状細菌等を除去するため
、必要な回数の画像の縮小処理及び拡大処理25を行っ
て、活性汚泥フロックのみを抽出する。(第3の工程)
この回数は、サンプルの拡大倍率と糸状細菌の太さ等を
考慮してこれを除去するのに必要十分な回数を行えばよ
い。抽出された活性汚泥フロックについて、面積を演算
計測26する。(第4の工程) この面積の演算計測は、例えば、フロック部の画素数と
、単位画素面積(画素4点でつくられる正方形の而槓)
とをもとに算出する方法で良く、また、画面全画素数に
対するフロック部の画素数の比率として算出しても良い
For example, calculate the maximum diameter of the target activated sludge floc, scan along the maximum diameter direction, determine the maximum brightness value and minimum brightness value from the brightness value distribution, and then calculate the maximum brightness value and minimum brightness value. It is preferable to set the brightness as at least one brightness level between the brightness and the brightness. As a result, a plurality of binarized images having different volatility values of the binarization process are obtained. (
FIG. 2 shows four examples. ) For each of the plurality of 2m images A to D, in order to remove filamentous bacteria and the like, image reduction processing and enlargement processing 25 are performed as many times as necessary to extract only activated sludge flocs. (Third step)
This may be carried out as many times as necessary to remove the filamentous bacteria, taking into consideration the magnification of the sample and the thickness of the filamentous bacteria. The area of the extracted activated sludge flocs is calculated and measured 26. (Fourth step) Calculation and measurement of this area can be done by calculating, for example, the number of pixels in the flock part and the unit pixel area (a square made of 4 pixels).
Alternatively, it may be calculated as the ratio of the number of pixels in the flock section to the total number of pixels on the screen.

求められた面積を比較して(27),その中の最大値に
対する各面積値の比率を算出する(28)。(第5の工
程)得られた数値をもとに、活性汚泥の分散集合の度合
、即ち稠密性について判定する。
The obtained areas are compared (27), and the ratio of each area value to the maximum value is calculated (28). (Fifth step) Based on the obtained numerical value, the degree of dispersion and aggregation of activated sludge, that is, the density is determined.

以上の内容を第5図を用いてよシ具体的に説明する。第
3図は、本発明の画像認識処理方法の原理を示す工程図
である。
The above content will be specifically explained using FIG. 5. FIG. 3 is a process diagram showing the principle of the image recognition processing method of the present invention.

サンプ/l/81は、フロックの周辺から中心に至る内
部に微生物が、疎に集合した活性汚泥フロックであυ、
サング/′L/S2は密に集合した活性汚泥フロックで
ある。
Sump/l/81 is an activated sludge floc in which microorganisms are sparsely gathered from the periphery to the center of the floc.
Sang/'L/S2 is a densely aggregated activated sludge floc.

第3−1図は、ガラス等により両面を狭まれた顕微鏡用
プレパラートの断面を示す模式図であるが、これらのサ
ンデyのある1#r面(例えば、前記の如く最大径方向
のある断面)を走査した輝度値分布曲線は第5−2図の
ようKなる。ここで、輝度値A−Dによって2fIL化
処理を行なうと、それぞれに応じて、第3−3図の如く
フロック部の面積が異って求められる。これらの面積を
第5工程に従って演算処理して得られた数値を各輝度値
に対してプロットしたものが第5−4図である。つまり
、内部の疎な活性汚泥フロック程、2誠化処理の輝度泣
の違いにより、抽出されるフロック面積のk化が大きい
ことになり、この変化の度合いを指標として、フロック
の禰゛護性が判定できることになる。
Figure 3-1 is a schematic diagram showing a cross section of a microscope preparation narrowed on both sides by glass or the like. ) is scanned and the brightness value distribution curve becomes K as shown in FIG. 5-2. Here, when 2fIL conversion processing is performed based on the luminance values A-D, the area of the flock portion is determined differently depending on each luminance value, as shown in FIG. 3-3. FIG. 5-4 shows numerical values obtained by arithmetic processing of these areas according to the fifth step, plotted for each luminance value. In other words, the more sparse the internal activated sludge flocs are, the larger the k change in the area of the extracted flocs will be due to the difference in brightness during the two-layer conversion process, and the degree of this change can be used as an index to evaluate the protection properties of the flocs. can be determined.

なお面積のかわりに体積を用いる場合には、求められた
面積にプVバフート間の厚みをかければよい。
Note that when volume is used instead of area, the obtained area may be multiplied by the thickness between P-V and Bahut.

変化の度合は、例えば、第5−4図の如く、直線とみな
して(最小2乗相関直線の算出)その傾きとして求める
方法を採用するなどすればよい。すなわちサンデA/8
2は輝度値の違いによる面積又は体積の認識率の変化が
サンプ/l/S1に較べて水平に近く小さいこと、即ち
フロック内部に至るまで敵生物の集合の程度が稠密であ
ることを表わしていて、この方法でフロックの稠密性を
評価できることがわかる。
The degree of change may be determined, for example, by regarding it as a straight line (calculating a least squares correlation straight line) and determining its slope, as shown in FIG. 5-4. That is, Sande A/8
2 indicates that the change in area or volume recognition rate due to differences in brightness values is nearly horizontal and small compared to sump/l/S1, that is, the degree of aggregation of enemy organisms is dense up to the inside of the floc. It can be seen that the density of flocs can be evaluated using this method.

こうしたデータを数多く集積しておき、観察の都度、そ
のデータベースを参照することによってフロックの状態
を判定することが可能となる。
By accumulating a large amount of such data and referring to the database each time an observation is made, it becomes possible to determine the state of the floc.

〔発明の効果〕〔Effect of the invention〕

上述したように、木范明によれば、従来行なえなかった
活性汚泥フロックの稠密性を定量化して評価することが
可能となシ、活性汚泥プロセスの安定した運転制御を達
成できる効果を生ずる。
As mentioned above, according to Mu Fanmei, it is possible to quantify and evaluate the density of activated sludge flocs, which could not be done conventionally, and it is possible to achieve stable operation control of the activated sludge process.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は,木伯明の活性汚泥の画像認識処理方法の運用
例を示す概略説明図、@2図は、本発明のフローの一例
を示す工,哩図、第3図は、本発明の厚理を示す工程図
である。 1・・・原水、2・・・曝気漕、3・・・曝気プロワ、
4・・・沈殿池、5・・・返送汚泥ポンプ、6・・・余
剰汚泥ポンプ、7・・・処理水、8・・・水中顕微鏡、
9・・・megaシステム,10−・・コントローラ、
11・・・沈殿汚泥、12・・・返送汚泥、13・・・
余剰汚泥 舘1図
Figure 1 is a schematic explanatory diagram showing an example of the operation of the image recognition processing method for activated sludge by Akira Kibo, Figure 2 is a diagram showing an example of the flow of the present invention, and Figure 3 is a diagram showing an example of the flow of the present invention. It is a process diagram showing thick plates. 1... Raw water, 2... Aeration tank, 3... Aeration blower,
4... Sedimentation tank, 5... Return sludge pump, 6... Excess sludge pump, 7... Treated water, 8... Underwater microscope,
9...mega system, 10-...controller,
11...Settled sludge, 12...Return sludge, 13...
Excess sludge tank 1 diagram

Claims (1)

【特許請求の範囲】 1、活性汚泥を拡大撮像し、画像処理する方法において
、 (1)原画像データの輝度値と背景画像データの輝度値
の差を演算する第1の工程と、 (2)第1の工程で得られた画像を複数の輝度値で2値
化処理する第2の工程と、 (3)第2の工程で得られた複数の画像を、各々縮小処
理及び拡大処理する第3の工程と、(4)第3の工程で
得られた画像中の活性汚泥フロックの面積又は体積を演
算する第4の 工程と、 (5)第4の工程で得られた複数の演算値の各々につい
て、それらのうちの最大値との比 率を演算する第5の工程と (6)第5の工程で得られた演算値により活性汚泥フロ
ックの稠密性を判定する第6の工 程 とからなることを特徴とする活性汚泥の画像認識方法。
[Claims] 1. A method for enlarging and image-processing activated sludge, comprising: (1) a first step of calculating a difference between a brightness value of original image data and a brightness value of background image data; ) a second step in which the image obtained in the first step is binarized using a plurality of brightness values, and (3) the plurality of images obtained in the second step are respectively reduced and enlarged. (4) a fourth step of calculating the area or volume of activated sludge flocs in the image obtained in the third step; (5) a plurality of calculations obtained in the fourth step; (6) a sixth step of determining the density of the activated sludge flocs based on the calculated value obtained in the fifth step; An image recognition method for activated sludge, characterized by comprising:
JP1049785A 1989-03-03 1989-03-03 Image recognition method for activated sludge Expired - Fee Related JPH0671598B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1049785A JPH0671598B2 (en) 1989-03-03 1989-03-03 Image recognition method for activated sludge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1049785A JPH0671598B2 (en) 1989-03-03 1989-03-03 Image recognition method for activated sludge

Publications (2)

Publication Number Publication Date
JPH02229596A true JPH02229596A (en) 1990-09-12
JPH0671598B2 JPH0671598B2 (en) 1994-09-14

Family

ID=12840815

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1049785A Expired - Fee Related JPH0671598B2 (en) 1989-03-03 1989-03-03 Image recognition method for activated sludge

Country Status (1)

Country Link
JP (1) JPH0671598B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012228645A (en) * 2011-04-26 2012-11-22 Hitachi Ltd Water treatment apparatus, water treating method, and program for the method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012228645A (en) * 2011-04-26 2012-11-22 Hitachi Ltd Water treatment apparatus, water treating method, and program for the method

Also Published As

Publication number Publication date
JPH0671598B2 (en) 1994-09-14

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