CN105607661A - Liquid level control system based on image identification - Google Patents

Liquid level control system based on image identification Download PDF

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Publication number
CN105607661A
CN105607661A CN201510967739.4A CN201510967739A CN105607661A CN 105607661 A CN105607661 A CN 105607661A CN 201510967739 A CN201510967739 A CN 201510967739A CN 105607661 A CN105607661 A CN 105607661A
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CN
China
Prior art keywords
module
liquid level
level control
image recognition
control
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Pending
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CN201510967739.4A
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Chinese (zh)
Inventor
朱浩亮
李利荣
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Nanjing University
Nanning Institute
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Nanning Institute
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Publication date
Application filed by Nanning Institute filed Critical Nanning Institute
Priority to CN201510967739.4A priority Critical patent/CN105607661A/en
Publication of CN105607661A publication Critical patent/CN105607661A/en
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D9/00Level control, e.g. controlling quantity of material stored in vessel
    • G05D9/12Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means

Abstract

The invention provides a liquid level control system based on image identification, and the liquid level control system is powered by a power supply module; liquid level information in a transparent container is acquired by a CCD image sensor, signal output ends of the CCD image sensor and a clock module are separately connected with corresponding signal input ends of a CPU processing module, and signal output ends of the CPU processing module are separately connected with signal input ends of a data memory module and a water pump control module. According to the invention, in a non-contact mode, image information can be captured by the CCD image sensor, liquid level can be measured through an image identification technology, the precision of the system can reach 0.5mm on liquid level in a calm state, a classical PID control method is adopted in a liquid control process to realize quick and accurate liquid level control; the system has simple structure, convenient of use, high precision, and has a certain practical application value and application prospect.

Description

A kind of tank level control system based on image recognition
Technical field
The present invention relates to liquid level Brake Control field, be specifically related to a kind of based on image recognitionTank level control system.
Background technology
Liquid level is one of modal control parameter in industrial production, and the effect of liquid level control is directAffect the quality of product, even become product and manufacture the key of success or failure.
The precision of level gauging and the method for process control are to affect two of liquid level control effectCrucial factor. In process control, pid algorithm is more classical and practical method, should in engineeringWith in also have compared with successful story. The method that level gauging aspect adopts at present has:
1, float type liquid level is measured: it is that the float of specific density is placed on liquid level, andBy the spring outside float and container, motor is connected by recommending steel band. Float method is simple and easy toOK, but certainty of measurement is low, and drive disk assembly is many, poor reliability, and maintenance is large, installs complicated.
2, differential pressure type level gauging: it is container bottom or side while utilizing liquid level to changeThe principle that pressure on certain point also becomes thereupon designs, and the size of differential pressure has reflected liquid levelJust. The impact of this method precision liquid body density, certainty of measurement not high universalizable is poor.
3, non-cpntact measurement, adopts ultrasonic measurement, radar surveying conventionally. Ultrasonic measurementThe method is used extensively, but hyperacoustic transmitting is easily interfered with reception, thereby is difficult toImprove the precision of measuring, error is larger, and the reliability of measuring-signal is also poor. Radar surveying essenceSpend higher, but price is high, technology performance difficulty and for slosh situation, measurementStability and reliability are poor.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of liquid level control based on image recognitionSystem processed, this tank level control system based on image recognition, under cordless, passes through CCDImage capture sensor image information, measures liquid level according to image recognition technology, in liquid level calmnessTime this system certainty of measurement can reach 0.5 millimeter, in the process of liquid level control, adopt warpThe PID control method of allusion quotation realizes the liquid level control of fast accurate.
The present invention is achieved by the following technical programs.
A kind of tank level control system based on image recognition provided by the invention, comprises ccd imageSensor, CPU processing module, clock module, supply module, data memory module and water pumpControl module, tank level control system is powered by supply module; Described ccd image sensor collectionLiquid level information in transparent vessel, the signal output of described ccd image sensor and clock moduleHold corresponding with CPU processing module respectively signal input part to connect, described CPU processing moduleSignal output part is connected with the signal input part of data memory module and water pump control module respectively.
On the sidewall of described transparent vessel, be provided with scale.
In described transparent vessel, be vertically installed with gauge.
Also comprise gear, amendment system time, the control of setting liquid level for setting level gaugingThe function setting module of height.
The signal output part of described CPU processing module is also inputted with the signal of LCD MODULEEnd connects.
Described CPU processing module adopts MSP430 single-chip microcomputer.
Described ccd image sensor adopts TSL1401 chip.
Described clock module adopts DS1302 clock chip.
Described data memory module adopts the AT24C02 numeral E2PROM storage of I2C communication protocolChip.
Beneficial effect of the present invention is: under cordless, pass through ccd image sensorCatch image information, measure liquid level according to image recognition technology, this device in the time that liquid level is tranquil itsPrecision can reach 0.5 millimeter, adopts classical PID control method in the process of liquid level controlRealize the liquid level control of fast accurate; The present invention is simple in structure, easy to use, precision is high,Liquid level control and fields of measurement have certain actual application value and application prospect.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention;
In figure: 1-transparent vessel, 2-gauge.
Detailed description of the invention
Further describe technical scheme of the present invention below, but claimed scope is not limited toIn described.
A kind of tank level control system based on image recognition as shown in Figure 1, comprises ccd imageSensor, CPU processing module, clock module, supply module, data memory module and water pumpControl module, tank level control system is powered by supply module; Described ccd image sensor collectionLiquid level information in transparent vessel 1, the signal of described ccd image sensor and clock module is defeatedGo out to hold corresponding with CPU processing module respectively signal input part to connect, described CPU processing moduleSignal output part connect with the signal input part of data memory module and water pump control module respectivelyConnect. Supply module adopts 5V, 12V two-way switch Power supply, and wherein SCM system adopts5V power supply, water pump control module adopts 12V power supply.
In described transparent vessel 1, be vertically installed with gauge 2, the standard that gauge is transparent materialIts minimum scale of chi is not limit, and is vertically positioned over transparent vessel inside or sticks on transparent appearance when useDevice inside and outside wall, also can directly use graduated transparent vessel 1 is set on sidewall. MeasuringWhen the liquid level of nontransparent container, can be from the bottom of nontransparent container an external transparent vessel, andCorresponding scale is set, just can directly uses native system to measure and control its liquid level.
Also comprise gear, amendment system time, the control of setting liquid level for setting level gaugingThe function setting module of height. Function setting module is 6 independent buttons, can by buttonSet level gauging gear, amendment system time, set the height of liquid level control.
The signal output part of described CPU processing module is also inputted with the signal of LCD MODULEEnd connects, and described CPU processing module adopts MSP430 single-chip microcomputer, described ccd image sensorAdopt TSL1401 chip, described clock module adopts DS1302 clock chip. Liquid crystal display modePiece adopts 12864 liquid crystal displays with Chinese word library.
Described data memory module adopts the AT24C02 numeral E2PROM storage of I2C communication protocolChip. In water pump control module, Ordination of pump is two-way DC12V water pump, and motor drive module isLM298。
The present invention in actual use, vertically places a gauge in transparent vessel 12, in transparent vessel 1, be placed with a certain amount of liquid (coloured colourless liquid can), its liquid levelAt certain scale place of gauge 2, now can read the elevation information of liquid level by gauge 2.
Measure when liquid level ccd image sensor scan image and image transmission is givenCPU treatment system. In the processing procedure of image information, known according to the refraction principle of light,Have larger color gray scale difference at liquid level intersection, thereby can be first according to this principleDetermine liquid level Position Approximate; Then utilize image digitization recognition technology to determine liquid level scope,As shown in Figure 1, first determine that liquid level is between 30 millimeters to 20 millimeters; And then from 30 millisBlack line number is down counted at rice 4, can determine that liquid level is 25 millimeters.
The present invention can arrange 4 grades of different ranges by function setting module and be respectively × millimeter,× centimetre, × decimeter, × meter, can select so such as gauge minimum scale is 1 centimetre × liRice gear. When liquid level control, by function button module, height, then CPU treatment system are setThe altitude information of liquid level is realized through PID computing output pwm signal control water pump driver moduleLiquid level precisely, fast control.
The present invention can also arrange system works in level gauging pattern by function setting moduleOr other patterns, and can by measure data real-time storage in data memory module, andOn liquid crystal display, show, thereby realize the function of monitoring in real time.

Claims (9)

1. the tank level control system based on image recognition, comprise ccd image sensor,CPU processing module, clock module, supply module, data memory module and water pump control module,Tank level control system is powered by supply module, it is characterized in that: described ccd image sensor is adoptedLiquid level information in collection transparent vessel (1), described ccd image sensor and clock moduleThe signal output part respectively signal input part corresponding with CPU processing module connects, described CPU placeThe signal output part of reason module is defeated with the signal of data memory module and water pump control module respectivelyEntering end connects.
2. the tank level control system based on image recognition as claimed in claim 1, its feature existsIn: on the sidewall of described transparent vessel (1), be provided with scale.
3. the tank level control system based on image recognition as claimed in claim 1, its feature existsIn: in described transparent vessel (1), be vertically installed with gauge (2).
4. as the tank level control system based on image recognition as described in arbitrary in claim 1~3,It is characterized in that: also comprise gear, amendment system time, setting for setting level gaugingThe function setting module of liquid level control height.
5. the tank level control system based on image recognition as claimed in claim 1, its feature existsIn: the signal output part of described CPU processing module also with the signal input part of LCD MODULEConnect.
6. as the liquid level control based on image recognition as described in arbitrary in claim 1,2,3 or 5System processed, is characterized in that: described CPU processing module adopts MSP430 single-chip microcomputer.
7. as the liquid level control based on image recognition as described in arbitrary in claim 1,2,3 or 5System processed, is characterized in that: described ccd image sensor adopts TSL1401 chip.
8. as the liquid level control based on image recognition as described in arbitrary in claim 1,2,3 or 5System processed, is characterized in that: described clock module adopts DS1302 clock chip.
9. as the liquid level control based on image recognition as described in arbitrary in claim 1,2,3 or 5System processed, is characterized in that: described data memory module adopts the AT24C02 of I2C communication protocolNumeral E2PROM storage chip.
CN201510967739.4A 2015-12-21 2015-12-21 Liquid level control system based on image identification Pending CN105607661A (en)

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Application Number Priority Date Filing Date Title
CN201510967739.4A CN105607661A (en) 2015-12-21 2015-12-21 Liquid level control system based on image identification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510967739.4A CN105607661A (en) 2015-12-21 2015-12-21 Liquid level control system based on image identification

Publications (1)

Publication Number Publication Date
CN105607661A true CN105607661A (en) 2016-05-25

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Cited By (4)

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CN106525664A (en) * 2016-11-24 2017-03-22 中纺协(北京)检验技术服务有限公司 Automatic testing equipment for capillary effect
CN107218994A (en) * 2017-05-22 2017-09-29 南宁学院 A kind of contactless vibrating sensor based on CCD
CN109171585A (en) * 2018-09-21 2019-01-11 北京金山安全软件有限公司 Dish-washing machine, dish-washing machine consumptive material monitoring method, device and storage medium
CN109753010A (en) * 2019-01-15 2019-05-14 江苏东方赛光电有限公司 A kind of real-time level monitoring data acquisition early warning system

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CN104907515A (en) * 2015-06-25 2015-09-16 烟台万隆真空冶金股份有限公司 Liquid level control system and liquid level measuring method based on oblique photography

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Publication number Priority date Publication date Assignee Title
CN1838005A (en) * 2006-03-28 2006-09-27 周红卫 Multifunctional control instrument
CN101294841A (en) * 2008-04-10 2008-10-29 上海大学 Automatic detecting device and method for measuring tank
FR2946138A1 (en) * 2009-05-26 2010-12-03 Bertin Technologies Sa METHOD AND DEVICE FOR RAPID MEASUREMENT OF PRESSURE OR VOLUME VARIATION IN A RESERVOIR
CN102343428A (en) * 2011-11-14 2012-02-08 上海金自天正信息技术有限公司 Molten steel level automatic control device and method thereof
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106525664A (en) * 2016-11-24 2017-03-22 中纺协(北京)检验技术服务有限公司 Automatic testing equipment for capillary effect
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CN109171585A (en) * 2018-09-21 2019-01-11 北京金山安全软件有限公司 Dish-washing machine, dish-washing machine consumptive material monitoring method, device and storage medium
CN109753010A (en) * 2019-01-15 2019-05-14 江苏东方赛光电有限公司 A kind of real-time level monitoring data acquisition early warning system

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Application publication date: 20160525