CN100394147C - Water level meter with digital video frequency - Google Patents
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- CN100394147C CN100394147C CNB2006100106393A CN200610010639A CN100394147C CN 100394147 C CN100394147 C CN 100394147C CN B2006100106393 A CNB2006100106393 A CN B2006100106393A CN 200610010639 A CN200610010639 A CN 200610010639A CN 100394147 C CN100394147 C CN 100394147C
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Abstract
The present invention relates to a digital video water gauge which belongs to the technical field of machine vision. The digital video water gauge is composed of a video input device (1), an image collecting card (2), a microprocessor (3) and a display screen (4). Because the present invention adopts the machine vision technology to detect the water stage, the steps of the water stage detection comprise collecting water stage images, processing and analyzing digital images and displaying storage. The water gauge has the advantages of noncontact no-loss, extensive detecting area, multiple-spacing alarm, adjustable sampling period, digital record and easy operation and maintenance, etc. Besides, the detecting precision reaches to the micron order. The water gauge achieves multi-liquid stage video measurement of the same visual field and ensures that a container which is filled with the detecting liquid is in the movable state. True color images of on-the-spot water stages are visually displayed, and current water stage change can be detected in real time. The present invention can be broadly applied to water stage automatic monitoring and liquid medium level change of various industries.
Description
Technical field
The present invention relates to a kind of digital video frequence water level meter, belong to the machine vision technique field.
Background technology
The monitoring instrument of existing water level and liquid material liquid level perhaps exists tested material directly to contact, damage easily, be difficult for installation and maintenance with water level gauge; Must stop work and production during installation and maintenance, cause damage bigger to thermal power plant, steel plant that must continuous working; Perhaps exist surveyed area narrow, can only detect single check point; And all there is technical deficiencies such as intuitively to observe detected medium.
Technology on year-on-year basis, US Patent specification, US006098029A, on August 1st, 2000, denomination of invention is " liquid level position measuring method and the LIQUID-LEVEL POSITION MEASURING METHOD AND SYSTEM of system ", this application case discloses the employing machine vision technique to liquid Level Measurement Method, relate generally to the measurement reservoir, the river, liquid level in the fixed static container is measured, can not realize that be to be kept in motion to multi-level video measuring in the same video input unit visual field with the container that measured liquid is housed, can not follow the tracks of the height displaying instrument automated graphics on the container of measured liquid.
The objective of the invention is to overcome the deficiency of prior art, and provide a kind of liquid medium liquid level that adopts the machine vision technique real-time online to monitor water level and variation automatically, it is harmless to have noncontact, wide (but the point-like of surveyed area, wire or planar detection), accuracy of detection can reach micron order, many spacing alarms, sampling period is adjustable, digital recording, realization is to be kept in motion to multi-level video measuring in the same video input unit visual field with the container that measured liquid is housed, height displaying instrument automated graphics on the container of measured liquid is followed the tracks of, both can intuitively show on-the-spot water level and liquid medium liquid level image, can detect the digital video frequence water level meter of advantages such as current water level or liquid level change value again in real time.
The present invention compared with prior art has following improvement:
But real time automatic detection water level or level value provide tested water level true color image intuitively simultaneously; Water level gauge does not have direct physical to be connected with measured medium, avoided because of under tested material corrosion or the non-normal temperature and pressure state to the direct influence of water level gauge, and water level gauge is installed, debugs, moves, is safeguarded and can finish when the measured medium operate as normal, do not need to carry out the repacking of any equipment; The digitized video water level gauge makes water level gauge both can be connected with central control room (CCR) upper monitoring management system, and decision-making management information is provided, and can be connected with the next control gear again, improves technological process, simultaneously again can independent operating; Can carry out point-like, wire or planar detection to measured medium, accuracy of detection can reach micron grade; Sampling period can be manually from millisecond be adjusted to second, branch, the time; Can write down and show tested SEA LEVEL VARIATION trend; Bound and many spacing alarms can be set; Realization is to be kept in motion to multi-level video measuring in the same video input unit visual field with the container that measured liquid is housed, and the height displaying instrument automated graphics on the container of measured liquid is followed the tracks of; Be suitable for that environment is abominable, high temperature, danger, harmful, the on-the-spot place of detecting of inconvenient personnel such as the path is far away; It is a kind of technology behave that guarantees safe production, lowers working strength and improve production management efficiency.
Summary of the invention:
The technical scheme of digital video frequence water level meter of the present invention is: digital video frequence water level meter is formed hardware components by video input unit (1), image pick-up card (2), microprocessor (3), display screen (4) and light filling lighting device (5); The water level gauge software section is by forming with lower module: communication, liquid level image segmentation are provided with module, parameter setting, image acquisition, image tracking, compression, processing, correction, analysis, numerical evaluation, demonstration, sensed water level, warning, data base administration, light filling illumination control; Data base administration has functions such as storage, inquiry.
Digital video frequence water level meter utilizes machine vision technique, realize when the container that measured liquid is housed be that the multi-level to same visual field carries out video measuring when being kept in motion.When measured liquid level was the multi-level video measuring of same visual field, the multi-level that contains in the digital video frequence water level meter software systems was cut apart module is set, and the multi-level of same visual field can be cut apart setting with the liquid level image by sequence number respectively in actual applications; Digital video frequence water level meter is measured by sequence number respectively each liquid level of same visual field respectively; When the container that measured liquid is housed is when being kept in motion, contain the image tracking module in the digital video frequence water level meter software systems, the image tracking module in the digital video frequence water level meter is followed the tracks of the height displaying instrument automated graphics that is installed on the container that measured liquid is housed.
Multi-level in the digital video frequence water level meter cuts apart that module is set is exactly that the multi-level of same visual field is cut apart the liquid level picture position respectively, according to concrete number assignment sequence number, Flame Image Process be according to sequence number and time sequencing to images acquired position, processing such as analysis, numerical evaluation, warning.
It is with after the water level gauge image digitazation that automated graphics is followed the tracks of, and utilizes the related function of the selected template image of real-time image scene and previous moment to determine the best match position of two images, thereby determines the position of target.Relevant module groundwork state has image data storage, field of search image data acquiring, directly template transmission, relevant matches computing, template correction, target identification (shown in the accompanying drawing 4).
The annexation of digital video frequence water level meter hardware components is: the output plug receptacle of video input unit (1) is connected with the input plug receptacle of image pick-up card (2), video input unit (1) is sent to image pick-up card (2) with water level analog or digital image by cable or data bus, image pick-up card (2) is connected with the bus slot of microprocessor (3), the hydrograph picture is treated in microprocessor (3), analyze, revise, calculate to wait and obtain current water level value, water level value and hydrograph picture can be stored in the microprocessor (3), can go up demonstration or carry out remote transmission by built-in communication port at display screen (4) simultaneously.The input end of display screen (4) is connected with the demonstration output terminal of microprocessor (3).The control input interface of light filling lighting device (5) is connected with the light filling lighting device control output interface of microprocessor (3).
Video input unit (1) can be in charge coupling device video camera, charge-priming device video camera, charge injection device video camera, the metal oxide semiconductor pickup camera any, is used to gather video hydrograph picture; Its function is that the optical imagery from camera lens is changed into time dependent vision signal.Image pick-up card (2) is standard analog or digital image acquisition card, also can be the digital camera or the video editing card of USB interface and software module or the hardware module that can carry out exchanges data with microprocessor (3) internal memory, be connected on PCI, the ISA or corresponding standard configuration bus of microprocessor (3); Its function is that the vision signal or the picture signal of video input unit (1) output are carried out color, gray-level quantization, makes vision signal become digitized view data.Microprocessor (3) is the equipment with standard computer function, containing cabinet, CPU and mainboard thereof, internal memory, ROM or hard disk, communication port, active negative etc., can be commercialization, civilian computing machine, server, industrial computer, DSP or the processor system with computer function.Display screen (4) is the display of standard computer compatibility, generally connects with microprocessor (3) to be placed in.Light filling lighting device (5) is the standard industry luminaire, is used to remedy when surround lighting changes and night, illumination can not satisfy the minimal illumination requirement of video input unit (1), and sensed water level or liquid level zone are carried out the light filling illumination.
Data transfer relation between each parts of this system is: video input unit (1) is input to image pick-up card (2) with the vision signal of being gathered, image pick-up card (2) carries out color, gray-level quantization with the vision signal or the picture signal of input in chronological order, make vision signal become digitized view data, and with data transmission to microprocessor (3), microprocessor (3) carries out data operation by various demands simultaneously to be handled, needs according to software program, by the video card of software transfer in the microprocessor (3), by video card control display screen (4) display image.When night or naturally optical illumination did not satisfy the minimal illumination that video input unit (1) requires, the light filling lighting device gauge tap of microprocessor (3) was opened automatically, the illumination of light filling lighting device (5) light filling; When the minimal illumination of video input unit (1) requirement was satisfied in natural lighting, the light filling lighting device gauge tap of microprocessor (3) was closed automatically, not light filling illumination of light filling lighting device (5).
Thereby realize when the container that measured liquid is housed be that the multi-level to same video input unit visual field carries out video measuring when being kept in motion.Digital video frequence water level meter is followed the tracks of the height displaying instrument automated graphics that is installed on the container that measured liquid is housed.It is with after the water level gauge image digitazation that automated graphics is followed the tracks of, and utilizes the related function of the selected template image of real-time image scene and previous moment to determine the best match position of two images, thereby determines the position of target height displaying instrument.
Video input unit of the present invention (1), image pick-up card (2), microprocessor (3), display screen (4), light filling lighting device (5) all are the normal component that can directly purchase.Water level gauge is installed near the measured medium or control center, distance when adopting direct vision cable to connect between water level gauge and measured medium is no more than 300 meters usually, when adopting post and telecommunications circuit, computer network circuit, optical cable or radio communication to connect, spacing can reach the physics limit of communication line length.
Description of drawings
Accompanying drawing 2 is the principle of work block diagram of digital video frequence water level meter.
Accompanying drawing 3 is the software flow block diagram of digital video frequence water level meter.
Accompanying drawing 4 is that the automated graphics of digital video frequence water level meter is followed the tracks of software flow block diagram.
Embodiment
Below in conjunction with accompanying drawing and with example the present invention is further described:
First example: detect two water levels of boiler-steam dome
Boiler-steam dome full water and lack of water accident are one of great serious accidents.Full water will make Boiler Steam seriously be with water, jet chimney generation water slug, even infringement follow-up equipment.For guaranteeing the safety of boiler operatiopn, need warning device is monitored and be equipped with to boiler-steam dome head, two water level point of drum tail in real time, to guarantee that water level is had dual even triple warning devices, this is absolutely necessary, in order to avoid boiler generation major accident, cause loss economically.
Digital video frequence water level meter is made up of video input unit (1), image pick-up card (2), microprocessor (3), display screen (4) and light filling lighting device (5).Video input unit (1) is sent to image pick-up card (2) with water level analog or digital image by cable or data bus, image pick-up card is sent to microprocessor (3) by data bus with digital picture, the hydrograph picture is treated in microprocessor (3) to obtain current water level value with analysis, and water level value and hydrograph picture can be stored in the microprocessor (3) and can go up demonstration or carry out remote transmission by built-in communication port at display screen (4) simultaneously.When one of them water level of a plurality of water level point in the same visual field of being monitored was higher than the highest alarm water level value or be lower than minimum alarm water level value, water level gauge system alarm module can sound the alarm to remind the user.Video input unit of the present invention (1), image pick-up card (2), microprocessor (3), display screen (4), light filling lighting device (5) all are the normal component that can directly purchase.Water level gauge is installed near the measured medium or control center, distance when adopting direct vision cable to connect between water level gauge and measured medium is no more than 300 meters usually, when adopting post and telecommunications circuit, computer network circuit, optical cable or radio communication to connect, spacing can reach the physics limit of communication line length.
Utilize machine vision technique to detect boiler drum level and adopt the following step:
A. video input unit (1) is aimed at two water level observation panels of drum head, drum tail of boiler-steam dome;
B. video input unit (1) is connected to the video inputs of the image pick-up card (2) of water level gauge;
C. the machine vision hydrograph of desire being carried out the water level detecting task deposits in the program storage of this water level gauge microprocessor (3) as analysis and processing program (shown in the accompanying drawing 3);
D. start the microprocessor (3) of this water level gauge system, the image pick-up card (2) of CPU follow procedure initialization water level gauge;
E. microprocessor (3) control image pick-up card (2) sampling period predefined by system or that be set by the user is gathered two the hydrograph pictures of boiler-steam dome in video input unit (1) visual field;
F. the multi-level of being furnished with in microprocessor (3) software systems is cut apart module is set, with two hydrographs of boiler-steam dome of same visual field as liquid level respectively by sequence number [1-1] and the setting of sequence number [1-2] image segmentation; Digital video frequence water level meter is measured by sequence number [1-1] and sequence number [1-2] respectively each liquid level of same visual field respectively;
G. microprocessor (3) looks like to handle with the numerical value correction to sequence number [1-1] and sequence number [1-2] hydrograph and analyzes the water level value of two hydrograph pictures of current boiler-steam dome;
H. microprocessor (3) with current boiler-steam dome sequence number [1-1] and sequence number [1-2] thus the calibration gauge of the water level value of hydrograph picture and demarcation compares the actual value that calculates current boiler drum level;
If surpassed the alarming line position that the user sets one of in i. detected current boiler-steam dome sequence number [1-1] and sequence number [1-2] the water level actual value, then alarm module starts sound or prompting is reported to the police;
J. microprocessor (3) is kept at the variation tendency and the alarm logging of required sequence number [1-1] and sequence number [1-2] hydrograph picture, water level actual value in the storer;
K. microprocessor (3) is with real-time boiler-steam dome sequence number [1-1] and sequence number [1-2] hydrograph picture, be simultaneously displayed on the display screen (4) with the variation tendency and the alarm logging of hydrograph as corresponding actual water place value, water level actual value.
Second example: the height displaying instrument automated graphics is followed the tracks of
Digital video frequence water level meter of the present invention is followed the tracks of the height displaying instrument automated graphics that is installed on the container that measured liquid is housed.It is with after the water level gauge image digitazation that automated graphics is followed the tracks of, and utilizes the related function of the selected template image of real-time image scene and previous moment to determine the best match position of two images, thereby determines the position of target.Relevant module groundwork state has image data storage, field of search image data acquiring, directly template transmission, relevant matches computing, template correction, target identification (shown in the accompanying drawing 4).The step of relevant matches computing is that image function is sent into the matching operation unit, the calculating absolute difference also adds up, the template data computing finishes, results of intermediate calculations is deposited storer, wait for that a frame water level gauge image all calculates the unified processing in the back that finishes, take out operation result then, and operation result sorted, calculate up to all matched positions so repeatedly and finish, obtain optimal match point, then according to system keeps track degree of confidence and template correction strategy new template more, the matching operation of preparing next frame water level gauge image, the position coordinates of output water level gauge image, the water level gauge image of control system is followed the tracks of.
The 3rd example: when the container that measured liquid is housed is to be kept in motion
Digital video water level gauge of the present invention also can be applicable to biological medicine, chemical field, and the container that measured liquid especially ought be housed is to be kept in motion to be example, and level monitoring of the present invention is done further to describe in detail:
The container that measured liquid is housed is to be kept in motion: generally be divided into the motion (being commonly referred to X-axis) of along continuous straight runs; Motion vertically (being commonly referred to Y-axis); Motion along the longitudinal direction (being commonly referred to the Z axle); Vertically be rotated motion in addition.In actual applications, the container that measured liquid is housed has only does above-mentioned one of them motion, and also to have be wherein two kinds of combinations, or even comprehensive or other motion of several motions is comprehensive.This just need realize that as analysis and processing program the height displaying instrument (ripple glass display tube or colored turnover panel water level display) that shows the liquid bit image is carried out automated graphics to be followed the tracks of by the machine vision hydrograph, the collection liquid bit image, the liquid place value of extracting liq bit image, again the liquid place value is carried out the numerical value correction by different direction of motion respectively, thereby and then the calibration gauge of liquid position modified value and demarcation compared the actual value that calculates current measured liquid position.Digital video frequence water level meter remaining to install and measure the same example of step identical, just do not give unnecessary details at this.
Claims (2)
1. digital video frequence water level meter, form hardware components by video input unit (1), image pick-up card (2), microprocessor (3), display screen (4) and light filling lighting device (5), the water level gauge software section is by forming with lower module: communication, parameter setting, image acquisition, compression, processing, correction, numerical evaluation, analysis, demonstration, sensed water level, warning, light filling illumination control, data base administration; The output plug receptacle of video input unit (1) is connected with the input plug receptacle of image pick-up card (2), video input unit (1) is sent to image pick-up card (2) with water level analog or digital image by cable or data bus, image pick-up card (2) is connected with the bus slot of microprocessor (3), the input end of display screen (4) is connected with the demonstration output terminal of microprocessor (3), and the control input interface of light filling lighting device (5) is connected with the light filling lighting device control output interface of microprocessor (3); Measured liquid level is the multi-level video measuring in same video input unit (1) visual field; It is characterized in that, contain multi-level in the digital video frequence water level meter and cut apart module is set.
2. a digital video frequence water level meter as claimed in claim 1 is characterized in that, described multi-level cuts apart that module is set is that the image of same visual field is cut apart according to multi-level.
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| CNB2006100106393A CN100394147C (en) | 2006-01-19 | 2006-01-19 | Water level meter with digital video frequency |
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| CN101718573B (en) * | 2009-12-04 | 2011-06-29 | 河海大学常州校区 | System and method for measuring water level based on image vision |
| CN102116664B (en) * | 2009-12-30 | 2013-11-06 | 捷达世软件（深圳）有限公司 | Water level monitoring system and method |
| CN101886942B (en) * | 2010-06-23 | 2012-02-22 | 江苏大学 | Water gauge marking method and water level detection method |
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| CN113324613B (en) * | 2021-05-28 | 2023-08-08 | 山东省海河淮河小清河流域水利管理服务中心 | Automatic monitoring and alarming method for dam piezometer tube water level |
| CN114877974B (en) * | 2022-06-08 | 2022-12-23 | 广州计量检测技术研究院 | Automatic liquid level setting method, device and equipment of measuring glass measuring device |
| CN117788610A (en) * | 2023-12-28 | 2024-03-29 | 无锡混沌能源技术有限公司 | Vision-based boiler liquid level detection system and method |
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