CN109035325A - A kind of spot center extracting method, device, equipment and computer readable storage medium - Google Patents
A kind of spot center extracting method, device, equipment and computer readable storage medium Download PDFInfo
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- CN109035325A CN109035325A CN201810975897.8A CN201810975897A CN109035325A CN 109035325 A CN109035325 A CN 109035325A CN 201810975897 A CN201810975897 A CN 201810975897A CN 109035325 A CN109035325 A CN 109035325A
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- spot center
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
Abstract
The invention discloses a kind of spot center extracting method, device, equipment and computer readable storage mediums.This method comprises: being that picture format is saved the format conversion of video image；Image after the conversion is pre-processed；Spot center position is extracted using center point fitting.Technical solution provided in an embodiment of the present invention, by building Video Image Collecting System Based, picture pick-up device is configured, finally spot center position is extracted to by the collected video image progress image preprocessing of picture pick-up device and using center point fitting, when solving with circle fitting process extraction spot center, poor anti jamming capability, the low problem of precision.The anti-interference for improving spot center algorithm realizes the accurate extraction of spot center, while reducing the number of iterations compared with circle fitting process.
Description
Technical field
The present embodiments relate to image processing techniques more particularly to a kind of spot center extracting method, device, equipment and
Computer readable storage medium.
Background technique
In recent years, the widely available application with high-speed photography and laser technology in terms of measuring object parameters, increasingly
More researchers studies the automatic machine characteristics of motion with it, but before this, it is necessary first to extract automatic machine characteristics of motion figure
The spot center of picture.
Currently, extract automatic machine characteristics of motion image spot center method mainly have gravity model appoach, Gauss curve fitting method and
Circle fitting process etc., and gravity model appoach, Gauss curve fitting method be since the complexity of itself is higher and positioning accuracy is not ideal enough, so that
A possibility that practicability improves very little.Circle fitting process is to approach light according to the principle of least square i.e. residual sum of squares (RSS) minimum with circle
Spot profile extracts spot center, and this method is derived and successive ignition can further improve detection accuracy.
However, circle fitting process leads to the automatic machine characteristics of motion image extracted due to its own poor anti jamming capability
Facula Center Location precision is low.
Summary of the invention
The present invention provides a kind of spot center extracting method, device, equipment and computer readable storage medium, fast to realize
Speed accurately extracts spot center.
In a first aspect, the embodiment of the invention provides a kind of spot center extracting methods, this method comprises:
It is that picture format is saved the format conversion of video image；
Image after the conversion is pre-processed；
Spot center position is extracted using center point fitting.
It further, is being before picture format is saved the format conversion of video image, further includes:
Video flowing is received from picture pick-up device；
According to default acquisition condition, the video image is intercepted from the video flowing.
Further, before the reception video flowing from picture pick-up device, further includes:
Build the system for acquiring the video image；
Picture pick-up device is configured.
Further, the image after the conversion is pre-processed, comprising: median filtering, brightness regulation, Threshold segmentation
And morphologic filtering.Second aspect, the embodiment of the invention also provides a kind of spot center extraction element, which includes:
Picture format conversion module, for being that picture format is saved the format conversion of video image；
Image pre-processing module, for being pre-processed to the image after the conversion；
Spot center extraction module, for extracting spot center position using center point fitting.
Further, described device further include:
Video flowing receiving module, for being the format conversion of video image before picture format saved,
Video flowing is received from picture pick-up device；
Video flowing interception module, for being the format conversion of video image before picture format saved, according to
Default acquisition condition, intercepts the video image from the video flowing.
Further, described device, further includes:
System building module, for building the acquisition video image before the reception video flowing from picture pick-up device
System；
Picture pick-up device configuration module, for matching before the reception video flowing from picture pick-up device to picture pick-up device
It sets.
Further, described image preprocessing module includes: median filter unit, brightness adjusting unit, Threshold segmentation list
Member and morphologic filtering unit.
The third aspect, the embodiment of the invention also provides a kind of equipment, which includes:
One or more processors；
Storage device, for storing one or more programs,
When one or more of programs are executed by one or more of processors, so that one or more of processing
Device realizes any spot center extracting method in first aspect.
Fourth aspect, the embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer
Program realizes any spot center extracting method in first aspect when the program is executed by processor.
Spot center extracting method provided in an embodiment of the present invention and device, it is right by building Video Image Collecting System Based
Picture pick-up device is configured, and is finally fitted to by the collected video image progress image preprocessing of picture pick-up device and using the center of circle
Method extracts spot center position, when solving with circle fitting process extraction spot center, poor anti jamming capability, and the low problem of precision.
The anti-interference for improving spot center algorithm realizes the accurate extraction of spot center, while reducing compared with circle fitting process
The number of iterations.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the spot center extracting method provided in the embodiment of the present invention one；
Fig. 2 is a kind of operation principle schematic diagram of the spot center extracting method provided in the embodiment of the present invention one；
Fig. 3 is a kind of block diagram of the spot center extraction element provided in the embodiment of the present invention two；
Fig. 4 is a kind of structural schematic diagram of the equipment provided in the embodiment of the present invention four.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing.It should be noted that for
The explanation of these embodiments is used to help understand the present invention, but and does not constitute a limitation of the invention.In addition, disclosed below
The each embodiment of the present invention involved in technical characteristic can be combined with each other as long as they do not conflict with each other.
Embodiment one
Fig. 1 is a kind of flow chart for spot center extracting method that the embodiment of the present invention one provides, and the present embodiment is applicable
In automatic machine characteristics of motion image spot center extraction situation, this method can be mentioned by spot center provided in an embodiment of the present invention
Device/equipment/computer readable storage medium is taken to execute, which can be used software
And/or the mode of hardware is realized.Referring to Fig. 1, this method is specifically included:
Step 110 saves the format conversion of video image for picture format.
Wherein, video image refer to acquisition the automatic machine characteristics of motion acquisition system the collected video lattice with .avi
The video image that formula saves.Acquisition system is by fan laser light curtain unit, high speed imaging and storage unit, data processing and display
Unit composition.Fan laser light curtain unit is to provide light source for acquisition system；Data processing unit can be containing data processing
The computer or hardware circuit of software；Display unit can be computer, oscillograph etc.；High speed imaging and storage unit are high speed
Camera and image pick-up card, selected here a Germany's Mikrotron company production model for MC1362 high speed camera with
And the image pick-up card of the model X64Xeelcra-CL PX4Full of matched Dalsa company production is, it can be achieved that full
Amplitude-frequency is shot in the case of resolution ratio 1280 × 1024 up to 500 frames/second, reducing resolution ratio can be improved shooting amplitude-frequency, and shooting amplitude-frequency is most
High setting is up to 120000 frames/second.
The working principle of this method, referring to fig. 2,205 be high speed camera, and 200 be the camera lens of high speed camera, and 201 be cylinder
Mirror, 202 be semiconductor laser, and 203 be automatic machine to be measured, and 204 be retroreflector screen, is attached on tested automatic machine, and 206 be meter
Calculation machine, 207 be the tripod of fixed high speed camera, and 208 be by test light curtain.Specifically, fixed immediately below camera lens 200
There is a wordline shape semiconductor laser 202；The laser of sending passes through the mirror of cylindrical convex lens 201 expanded and camera lens centre is installed
Face 209 changes laser optical path (vertical direction becomes horizontal direction), generates test light curtain 208 and projects automatic machine 203 to be measured
On plane of movement；A fritter retroreflector screen 204 is posted on automatic machine for retroreflector laser, and is done together with automatic machine to be measured
Step movement；When automatic machine moves, high speed camera 205 is controlled by external trigger mode in due course and tracks retroreflector screen flare
Movement travel is transmitted to computer 206 eventually by data transmission link, is handled using data processing unit software and obtains automatic machine
The video image of the characteristics of motion.
It is converted when image procossing firstly the need of the storage format to file, video format is converted to the picture of .GIF
Format is simultaneously saved.Specifically, reading the .avi file under specified store path first with aviread function and using size
Function calculates the totalframes n of the included picture of video file, and cycle-index is arranged according to totalframes, does standard for subsequent conversion work
It is standby.Be that the sequence of pictures that is converted into is named using strcat function, name tail number since 0 ing until n-1, put in order and
The playing sequence of video file is consistent, and then the store path of sequence of pictures is arranged, using frame2im function to video
File is converted, and the image information after converting is written to formulation with the format of .GIF eventually by imwrite function
Store path, conversion end.
Step 120 pre-processes the image after conversion.
Wherein, pretreatment is primarily referred to as being filtered image sequence.Commonly used filtering method is divided into linear filtering, non-
Linear filtering and adaptive-filtering etc..Pretreatment can specifically include: median filtering, brightness regulation, Threshold segmentation and form
Learn filtering.Specifically, contrast is obvious firstly, it is necessary to make image clearly to collected light spot image progress brightness regulation,
And noise suppression preprocessing is carried out with median filtering.Then suitable threshold segmentation method is selected to separate image and background, i.e., it will be grey
Degree image is converted into bianry image.Since the image border after Threshold segmentation still contains biggish noise, thus need into
Row denoising.And morphologic noise filter is made of the operation for opening and being closed combination, provide it is a kind of effectively and
Quick nonlinear filtering technique keeps image apparent under the premise of not destroying original image useful details.Therefore first to segmentation
Image afterwards carries out opening operation, then carries out the method for closed operation to it to realize morphologic filtering, to reach smoothed image edge
Purpose.
Step 130 extracts spot center position using center point fitting.
For obtained pretreated image, need to carry out center of circle fitting to it.Specifically, using form mathematic(al) function first
Regionprops finds out elliptical long axis length, the minor axis length, centrifugation for having identical standard second-order moment around mean with required region
Rate, mass center, area etc., and find out the apex coordinate of the minimal convex polygon comprising the region.By certain method, use is ellipse
Round relevant parameter determines that has a regular polygon for quite a lot of number of edges, and makes the regular polygon close to a circle.It obtains at this time
This circle seek to fitting circle.
It finally chooses on the circle of obtained fitting at 3 points, obtains automatic machine characteristics of motion image spot with three-point circle method
Center.
The technical solution of the present embodiment configures picture pick-up device by building Video Image Collecting System Based, finally right
Image preprocessing is carried out by the collected video image of picture pick-up device and spot center position is extracted using center point fitting, is solved
When extracting spot center with circle fitting process, poor anti jamming capability, precision low problem.Improve the anti-dry of spot center algorithm
Immunity realizes the accurate extraction of spot center, while reducing the number of iterations compared with circle fitting process.
Further, prior to step 110, further includes:
Video flowing is received from picture pick-up device；
According to default acquisition condition, video image is intercepted from video flowing.
Wherein, picture pick-up device can be high-speed camera etc..When according to acquisition video image, the acquisition condition of setting, from
Selecting video image in collected video flowing.Acquisition condition may include time for exposure, the start stop bit for shooting amplitude-frequency, pixel
It sets and triggering mode etc..Wherein, the time for exposure is to project light on the photosurface of camera photosensitive material, and shutter is wanted
The time of opening, depending on the sensitivity of sensitive photographic material and to the illumination on photosurface；Shooting amplitude-frequency is in camera 1 second
The number of shooting；The start-stop position of pixel is the position being configured like and size；Triggering mode includes external trigger (external trigger
TTL pulse up and down edge) and software triggering.
In addition, receiving video flowing from picture pick-up device, further includes:
The system for building acquisition video image；
Picture pick-up device is configured.
Embodiment two
Fig. 3 is the block diagram of spot center extraction element provided by Embodiment 2 of the present invention, and any implementation of the present invention can be performed
Spot center extracting method provided by example, has the corresponding functional module of execution method and beneficial effect.As shown in figure 3, should
Device includes:
Picture format conversion module 301, for being that picture format is saved the format conversion of video image；
Image pre-processing module 302, for being pre-processed to the image after conversion；
Spot center extraction module 303, for extracting spot center position using center point fitting.
The technical solution of the present embodiment configures picture pick-up device by building Video Image Collecting System Based, finally right
Image preprocessing is carried out by the collected video image of picture pick-up device and spot center position is extracted using center point fitting, is solved
When extracting spot center with circle fitting process, poor anti jamming capability, precision low problem.Improve the anti-dry of spot center algorithm
Immunity realizes the accurate extraction of spot center, while reducing the number of iterations compared with circle fitting process.
Optionally, above-mentioned apparatus can also include:
Video flowing receiving module, for being the format conversion of video image before picture format saved,
Video flowing is received from picture pick-up device；
Video flowing interception module, for being the format conversion of video image before picture format saved, according to
Default acquisition condition, intercepts video image from video flowing.
Optionally, above-mentioned apparatus can also include:
System building module, the system for building acquisition video image before receiving video flowing from picture pick-up device；
Picture pick-up device configuration module, for being configured to picture pick-up device before receiving video flowing from picture pick-up device.
Wherein, image pre-processing module includes: median filter unit, brightness adjusting unit, Threshold segmentation unit and form
Learn filter unit.
Embodiment three
Fig. 4 is a kind of structural schematic diagram for equipment that the embodiment of the present invention three provides.Fig. 4, which is shown, to be suitable for being used to realizing this
The block diagram of the example devices 12 of invention embodiment.The equipment 12 that Fig. 4 is shown is only an example, should not be to of the invention real
The function and use scope for applying example bring any restrictions.
As shown in figure 4, the equipment 12 is showed in the form of universal computing device.The component of the equipment 12 may include but not
Be limited to: one or more processor or processing unit 16, system storage 28 connect different system components (including system
Memory 28 and processing unit 16) bus 18.
Bus 18 indicates one of a few class bus structures or a variety of, including memory bus or Memory Controller,
Peripheral bus, graphics acceleration port, processor or the local bus using any bus structures in a variety of bus structures.It lifts
For example, these architectures include but is not limited to industry standard architecture (ISA) bus, microchannel architecture (MAC)
Bus, enhanced isa bus, Video Electronics Standards Association (VESA) local bus and peripheral component interconnection (PCI) bus.
Equipment 12 typically comprises a variety of computer system readable media.These media can be it is any can be by equipment 12
The usable medium of access, including volatile and non-volatile media, moveable and immovable medium.
System storage 28 may include the computer system readable media of form of volatile memory, such as arbitrary access
Memory (RAM) 30 and/or cache memory 32.Equipment 12 may further include it is other it is removable/nonremovable,
Volatile/non-volatile computer system storage medium.Only as an example, storage system 34 can be used for reading and writing irremovable
, non-volatile magnetic media (Fig. 4 do not show, commonly referred to as " hard disk drive ").Although not shown in fig 4, use can be provided
In the disc driver read and write to removable non-volatile magnetic disk (such as " floppy disk "), and to removable anonvolatile optical disk
The CD drive of (such as CD-ROM, DVD-ROM or other optical mediums) read-write.In these cases, each driver can
To be connected by one or more data media interfaces with bus 18.Memory 28 may include at least one program product,
The program product has one group of (for example, at least one) program module, these program modules are configured to perform each implementation of the invention
The function of example.
Program/utility 40 with one group of (at least one) program module 42 can store in such as memory 28
In, such program module 42 include but is not limited to operating system, one or more application program, other program modules and
It may include the realization of network environment in program data, each of these examples or certain combination.Program module 42 is usual
Execute the function and/or method in embodiment described in the invention.
Equipment 12 can also be communicated with one or more external equipments 14 (such as keyboard, sensing equipment, display 24 etc.),
Can also enable a user to the equipment interacted with the equipment communication with one or more, and/or with enable the equipment 12 and one
A or a number of other any equipment (such as network interface card, modem etc.) communications for calculating equipment and being communicated.This communication
It can be carried out by input/output (I/O) interface 22.Also, equipment 12 can also by network adapter 20 and one or
Multiple networks (such as local area network (LAN), wide area network (WAN) and/or public network, such as internet) communication.As shown, net
Network adapter 20 is communicated by bus 18 with other modules of equipment 12.It should be understood that being set although not shown in the drawings, can combine
Standby 12 use other hardware and/or software modules, including but not limited to: microcode, device driver, redundant processing unit, outer
Portion's disk drive array, RAID system, tape drive and data backup storage system etc..
Processing unit 16 by the program that is stored in system storage 28 of operation, thereby executing various function application and
Data processing, such as realize spot center extracting method provided by the embodiment of the present invention.
Example IV
The embodiment of the present invention four additionally provides a kind of computer readable storage medium, is stored thereon with computer program, should
Program can realize spot center extracting method any in above-described embodiment when being executed by processor.
The computer storage medium of the embodiment of the present invention, can be using any of one or more computer-readable media
Combination.Computer-readable medium can be computer-readable signal media or computer readable storage medium.It is computer-readable
Storage medium for example may be-but not limited to-the system of electricity, magnetic, optical, electromagnetic, infrared ray or semiconductor, device or
Device, or any above combination.The more specific example (non exhaustive list) of computer readable storage medium includes: tool
There are electrical connection, the portable computer diskette, hard disk, random access memory (RAM), read-only memory of one or more conducting wires
(ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-
ROM), light storage device, magnetic memory device or above-mentioned any appropriate combination.In this document, computer-readable storage
Medium can be any tangible medium for including or store program, which can be commanded execution system, device or device
Using or it is in connection.
Computer-readable signal media may include in a base band or as carrier wave a part propagate data-signal,
Wherein carry computer-readable program code.The data-signal of this propagation can take various forms, including but unlimited
In electromagnetic signal, optical signal or above-mentioned any appropriate combination.Computer-readable signal media can also be that computer can
Any computer-readable medium other than storage medium is read, which can send, propagates or transmit and be used for
By the use of instruction execution system, device or device or program in connection.
The program code for including on computer-readable medium can transmit with any suitable medium, including --- but it is unlimited
In wireless, electric wire, optical cable, RF etc. or above-mentioned any appropriate combination.
The computer for executing operation of the present invention can be write with one or more programming languages or combinations thereof
Program code, described program design language include object oriented program language-such as Java, Smalltalk, C++,
Further include conventional procedural programming language-such as " C " language or similar programming language.Program code can be with
It fully executes, partly execute on the user computer on the user computer, being executed as an independent software package, portion
Divide and partially executes or executed on a remote computer or server completely on the remote computer on the user computer.?
Be related in the situation of remote computer, remote computer can pass through the network of any kind --- including local area network (LAN) or
Wide area network (WAN)-be connected to subscriber computer, or, it may be connected to outer computer (such as mentioned using Internet service
It is connected for quotient by internet).
Above-described embodiment serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
By the description above with respect to embodiment, it is apparent to those skilled in the art that, the present invention
It can be realized by software and required common hardware, naturally it is also possible to which by hardware realization, but in many cases, the former is more
Good embodiment.Based on this understanding, technical solution of the present invention substantially in other words contributes to the prior art
Part can be embodied in the form of software products, which can store in computer readable storage medium
In, floppy disk, read-only memory (Read-Only Memory, ROM), random access memory (Random such as computer
Access Memory, RAM), flash memory (FLASH), hard disk or CD etc., including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes method described in each embodiment of the present invention.
It is worth noting that, included each unit and module are only according to function in the embodiment of above-mentioned searcher
Energy logic is divided, but is not limited to the above division, as long as corresponding functions can be realized；In addition, each function
The specific name of energy unit is also only for convenience of distinguishing each other, the protection scope being not intended to restrict the invention.
Claims (10)
1. a kind of spot center extracting method characterized by comprising
It is that picture format is saved the format conversion of video image；
Image after the conversion is pre-processed；
Spot center position is extracted using center point fitting.
2. spot center extracting method according to claim 1, which is characterized in that be the format conversion of video image
Before picture format is saved, further includes:
Video flowing is received from picture pick-up device；
According to default acquisition condition, the video image is intercepted from the video flowing.
3. spot center extracting method according to claim 2, which is characterized in that receive video from picture pick-up device described
Before stream, further includes:
Build the system for acquiring the video image；
Picture pick-up device is configured.
4. spot center extracting method according to claim 1, which is characterized in that carried out to the image after the conversion pre-
Processing, comprising: median filtering, brightness regulation, Threshold segmentation and morphologic filtering.
5. a kind of spot center extraction element characterized by comprising
Picture format conversion module, for being that picture format is saved the format conversion of video image；
Image pre-processing module, for being pre-processed to the image after the conversion；
Spot center extraction module, for extracting spot center position using center point fitting.
6. spot center extraction element according to claim 5, which is characterized in that further include:
Video flowing receiving module, for being before picture format is saved, to be set from camera shooting the format conversion of video image
It is standby to receive video flowing；
Video flowing interception module, for being before picture format is saved, according to default the format conversion of video image
Acquisition condition intercepts the video image from the video flowing.
7. spot center extraction element according to claim 6, which is characterized in that further include:
System building module, for before the reception video flowing from picture pick-up device, build the acquisition video image to be
System；
Picture pick-up device configuration module, for being configured to picture pick-up device before the reception video flowing from picture pick-up device.
8. spot center extraction element according to claim 5, which is characterized in that described image preprocessing module includes:
Median filter unit, brightness adjusting unit, Threshold segmentation unit and morphologic filtering unit.
9. a kind of equipment, which is characterized in that the equipment includes:
One or more processors；
Storage device, for storing one or more programs,
When one or more of programs are executed by one or more of processors, so that one or more of processors are real
Now such as spot center extracting method as claimed in any one of claims 1-3.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
Such as spot center extracting method as claimed in any one of claims 1-3 is realized when execution.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112288802A (en) * | 2020-11-22 | 2021-01-29 | 上海市特种设备监督检验技术研究院 | Laser measurement light spot center positioning method for crane track |
-
2018
- 2018-08-24 CN CN201810975897.8A patent/CN109035325A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112288802A (en) * | 2020-11-22 | 2021-01-29 | 上海市特种设备监督检验技术研究院 | Laser measurement light spot center positioning method for crane track |
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Application publication date: 20181218 |