CN109059763A - The method and device of mobile phone for measuring size based on laser ranging and image comparison - Google Patents
The method and device of mobile phone for measuring size based on laser ranging and image comparison Download PDFInfo
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- CN109059763A CN109059763A CN201810897925.9A CN201810897925A CN109059763A CN 109059763 A CN109059763 A CN 109059763A CN 201810897925 A CN201810897925 A CN 201810897925A CN 109059763 A CN109059763 A CN 109059763A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses the methods and device of a kind of mobile phone for measuring size based on laser ranging and image comparison, the following steps are included: shooting the image of the object of several known actual sizes and shooting distance, the image that shooting is obtained is stored in image data base, and the shooting distance for shooting object is carried out sorted generalization as condition entry；Mobile phone is directed at object under test, starts the laser emitter of mobile phone, shooting distance is calculated according to the laser reflection time in mobile phone；Object is shot with mobile phone, obtains object under test image；The image of object under test and shooting distance are compared with the image in image data base, obtain the contrast images of closest-approach distance；According to the dimension scale of object under test image and contrast images, calculate object under test actual size data.The present invention is by way of mobile phone photograph comparative analysis, to be measured to the apparent size of object, not only easy to operate, using flexible, and also measurement accuracy is high, has extraordinary practical function.
Description
Technical field
It is the present invention relates to a kind of method for measuring dimension of object, in particular to a kind of based on laser ranging and image comparison
The method and device thereof of mobile phone for measuring size.
Background technique
It needs to measure the apparent size of object using measuring tool in daily life, it is sometimes desirable to tree
Wood, building and the biggish object of volume specification carry out dimensional measurement, and existing dimensional measurement mode mainly passes through tape measure etc.
Tool measures, heavy workload, and working efficiency is low.Furthermore during house decoration, it is also desirable to housing window
Size measures, and existing is usually worker's handheld measurement tool to carry out manual measurement, not only great work intensity, but also
Low efficiency, measurement accuracy be not high.
Summary of the invention
The object of the present invention is to provide a kind of method of mobile phone for measuring size based on laser ranging and image comparison and
Its device.The present invention is by way of mobile phone photograph comparative analysis, to be measured to the apparent size of object, not only operation letter
Just, using flexible, and measurement accuracy is high, has extraordinary practical function.
Technical solution of the present invention: a method of the mobile phone for measuring size based on laser ranging and image comparison, including
Following steps:
(1) image of the object of actual size and shooting distance known to multiple groups is shot, the image that shooting is obtained is stored in hand
The image data base of machine, and the shooting distance for shooting object is subjected to sorted generalization as condition entry；
(2) mobile phone is directed at object under test, starts the laser emitter of mobile phone, laser transmitter projects laser to determinand
Body surface face is simultaneously reflected back mobile phone, and shooting distance is calculated according to the laser reflection time in mobile phone；
(3) it is shot with mobile phone measuring targets, obtains object under test image；
(4) image of object under test and shooting distance are compared with the image in image data base, acquisition most connects
The contrast images of short distance；
(5) it according to the actual size of the dimension scale and contrast images of object under test image and contrast images, calculates
The actual size data of object under test；
(6) actual size of object under test is shown by mobile phone.
In the method for the above-mentioned mobile phone for measuring size based on laser ranging and image comparison, in step (1), described image
Admission has the actual size data of image measured by n different shooting distances in database.
In the method for mobile phone for measuring size above-mentioned based on laser ranging and image comparison, by the obtained image of shooting into
Row object under test feature extraction processing, then the image in the image and image data base after object under test feature extraction is carried out pair
Than.
In the method for mobile phone for measuring size above-mentioned based on laser ranging and image comparison, at object under test feature extraction
Reason method is to add outer profile in the outside of the actual profile of object under test, in the inside addition of the actual profile of object under test
Space between outer profile and Internal periphery is cut into many straight lines, and takes M point on the every line in N straight line by profile,
Available M × N number of point bounded domain, then the wheel with least energy is found out according to snake model formula in the bounded domain
Exterior feature obtains the actual profile of object under test, realizes the feature extraction of object under test.
In the method for mobile phone for measuring size above-mentioned based on laser ranging and image comparison, snake model formula is
By following formula discretization
The energy for obtaining snake model point is
E(vi)=λ Eint(vi)+(1-λ)Eext(vi)
Wherein the energy theorem of the profile of least energy is
In the method for mobile phone for measuring size above-mentioned based on laser ranging and image comparison, at object under test feature extraction
Reason method is to shooting image configuration energy functional；
It is unfolded using Taylor formula, can be arrived further according to step integration method；
The minimum for passing through the available energy functional number of interative computation again, asks the two-dimentional variation in image procossing
Topic, gradient descent flow can be expressed as
Analytic solutions are finally obtained, the edge contour of object under test in shooting image is obtained, realize determinand in shooting image
The feature extraction of body.
In the device for realizing the method for the mobile phone for measuring size based on laser ranging and image comparison, which is installed in hand
On machine, including fixing sleeve, the fixing sleeve are socketed in the top of mobile phone, and the fixing sleeve is in the position just opposite with mobile phone camera
Through-hole is installed, the side of through-hole is equipped with mounting cylinder, is equipped with bottom plate in the mounting cylinder, and ranging dress is equipped on the bottom plate
It sets, range unit includes the laser emitter, laser pickoff and processor being fixed on bottom plate, the laser emitter and is swashed
Optical receiver is connect with processor respectively, and the processor is connected with data line, and data line is connect with mobile phone.
In the device of the method for the above-mentioned mobile phone for measuring size based on laser ranging and image comparison, the range unit
It further include the storage slot for being fixed on bottom plate side, storage slot is connected with processor.
The device of the method for mobile phone for measuring size above-mentioned based on laser ranging and image comparison, the top of the mounting cylinder
End screw thread is equipped with top cover.
In the device of the method for mobile phone for measuring size above-mentioned based on laser ranging and image comparison, the fixing sleeve by
Flexible plastic material is made.
Compared with prior art, the present invention shoots the image of the object of actual size and shooting distance known to multiple groups first,
The image that shooting is obtained is stored in image data base, and the shooting distance for shooting object is carried out sorted generalization as condition entry.
When measuring dimension of object, is measured by the shooting distance of the laser ranging system measuring targets of mobile phone, then passed through
Mobile phone camera shoots object under test image, using shooting distance as condition entry, to be compared with the image of image data base,
It obtains the contrast images of closest-approach distance, then according to the dimension scale of object under test image and contrast images, compares meter
It calculates, and obtains the actual dimension data of object under test.The present invention is by way of mobile phone photograph comparative analysis, to object
Apparent size measures, not only easy to operate, using flexible, and measurement accuracy is high, has extraordinary practical function.This
Invention is using laser ranging system, because of its strong antijamming capability, so that the data information of obtained shooting distance is more
Accurately, so that the actual size of obtained object under test is more accurate.
In addition, the present invention shoots object in mobile phone, after obtaining object under test image, the image taken the photograph is carried out
Object under test feature extraction processing, then the image after object under test feature extraction is stored in image data base.By to shooting figure
Feature extraction processing as carrying out object under test, can accurately obtain the actual size profile of object under test, avoid front and back scape
Or interference of the profile of other objects to subsequent contrast's step, improve the precision of comparison.Further, the feature
Outer profile is added in the outside for the object under test that extraction process can use, and Internal periphery is added in the inside of object under test, by foreign steamer
Space between wide and Internal periphery is cut into many straight lines, and takes M point on the every line in N straight line, and available M ×
The bounded domain of N number of point, then the profile with least energy is found out according to snake model formula in the bounded domain, it realizes to be measured
The feature extraction of object.Or measuring targets latent structure energy functional, then energy is obtained through step integration and interative computation
The minimum of functional finally obtains analytic solutions, obtains the edge contour of object under test in shooting image, realizes in shooting image
The feature extraction of object under test.
The invention also includes the devices of the method based on laser ranging and the mobile phone for measuring size of image comparison, including socket
Fixing sleeve on mobile phone, fixing sleeve are equipped with processor, laser emitter and laser pickoff, by laser emitter and swash
The shooting distance that optical receiver carrys out measuring targets measures, wherein laser emitter and laser pickoff and processor phase
It connects, the shooting distance data that shooting obtains is passed into mobile phone by data line using processor, obtain the shooting of object under test
Distance.The present apparatus is equipped with top cover by the top in mounting cylinder, to protect to internal electronic device, while being convenient for again
Disassembly, and be conducive to overhaul the electronic device inside mounting cylinder.Additionally by being connected with storage slot on a processor,
Storage card is installed, measurement data stored.
Detailed description of the invention
Fig. 1 is fixing sleeve of the present invention and mobile phone assembling schematic diagram；
Fig. 2 is fixing sleeve structural schematic diagram；
Fig. 3 is mounting cylinder schematic diagram of internal structure；
Fig. 4 is mounting cylinder front schematic view；
Fig. 5 is present system block diagram；
Fig. 6 is operation of the present invention flow chart；
Fig. 7 is object under test feature-extraction analysis schematic diagram of the invention；
Fig. 8 is object under test feature-extraction analysis schematic diagram of the invention.
1- mobile phone；2- fixing sleeve；3- mounting cylinder；4- through-hole；5- data line；6- top cover；7- bottom plate；8- laser emitter；
9- laser pickoff；10- processor；11- stores slot.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment 1: a method of the mobile phone for measuring size based on laser ranging and image comparison, comprising the following steps:
(1) image of the object of actual size and shooting distance known to multiple groups, the image deposit figure that shooting is obtained are shot
Sorted generalization is carried out as condition entry as database, and using the shooting distance for shooting object.
Image analysis is that certain useful measurements, data or information are extracted from image.Purpose is to obtain certain numerical value knot
Fruit, rather than generate another image.The content of image analysis and the research field of pattern-recognition, artificial intelligence have intersection, but
Image analysis and typical pattern-recognition different from.Image analysis is not limited to the specific region in image by fixed number
Classification is classified, it is mainly to provide a kind of description about analyzed image.For this purpose, mode identification technology should be utilized,
The knowledge base about picture material, i.e. content in artificial intelligence in terms of knowledge representation are utilized again.Image analysis needs
The feature of image is extracted with image partition method, and the description of symbolism is then carried out to image.This description can not only be to figure
Answer is made with the presence or absence of a certain special object as in, moreover it is possible to is described in detail to picture material.
(2) mobile phone is directed at object under test, starts the laser emitter of mobile phone, laser transmitter projects laser to determinand
Body surface face is simultaneously reflected back mobile phone, and shooting distance is calculated according to the laser reflection time in mobile phone.
(3) it is shot with mobile phone measuring targets, obtains object under test image.
(4) image of object under test and shooting distance are compared with the image in image data base, acquisition most connects
The contrast images of short distance.
(5) it according to the actual size of the dimension scale and contrast images of object under test image and contrast images, calculates
The actual size data of object under test.
(6) actual size of object under test is shown by mobile phone.
Images match, description and identification are compared and are registrated to image, by point feature of system extraction image and mutually
Relationship obtains the description of image symbolization, then it is compared with model, to determine its classification.Images match attempts to establish two
Geometrical correspondence between image measures its similar or different degree.Matching between image or image and map it
Between registration, certain useful measurements, data or information are extracted from image and is known as image analysis.The basic step of image analysis
To segment the image into some regions not overlapped, each region is a continuum of pixel, measure they property and
Relationship is finally compared the model of obtained images relations structure and description scenery classification, to determine its type.Identification or
The basis of classification is the similarity of image.A kind of distance in simple similarity Free Region feature space defines.It is another
Similarity measure of the kind based on pixel value is the correlation of image function.A kind of last similarity being defined on relational structure is known as
Structural similarity.
In step (1), admission has the actual size of image measured by n different shooting distances in described image database
Data.
The device for implementing the method for the above-mentioned mobile phone for measuring size based on laser ranging and image comparison, such as Fig. 1 and Fig. 2 institute
Show, which is installed on mobile phone 1, including fixing sleeve 2, and the fixing sleeve 2 is made of flexible plastic material, is convenient for fixing sleeve 2
It is fixedly attached on mobile phone 1, the fixing sleeve 2 is socketed in the top of mobile phone 1, and the contact surface of the fixing sleeve 2 and mobile phone 1 is equipped with
Lint flannelette avoids scratching 1 shell of mobile phone, the fixing sleeve 2 is just opposite with 1 camera of mobile phone to protect mobile phone 1
Position be equipped with through-hole 4, the side of through-hole 4 is equipped with mounting cylinder 3 and is equipped in the mounting cylinder 3 as shown in Fig. 3, Fig. 4 and Fig. 5
Bottom plate 7 is equipped with range unit on the bottom plate 7, and range unit includes that laser emitter 8, the laser being fixed on bottom plate 7 connect
It receives device 9 and processor 10, the laser emitter 8 and laser pickoff 9 is connect with processor 10 respectively, the processor 10 connects
It is connected to data line 5, data line 5 is connect with mobile phone 1, and the range unit further includes the storage slot 11 for being fixed on 7 side of bottom plate,
Storage slot 11 is connected with processor 10, by extrapolation storage card, to be stored to measurement data, and the top of the mounting cylinder 3
End screw thread is equipped with top cover 6, and top cover 6 is transparent material, to be sealed protection to the electronic device inside mounting cylinder 3, and
And the electronic device inside mounting cylinder 3 is overhauled convenient for opening again.
During measuring dimension of object, concrete operations are then turned on as shown in fig. 6, by the positive measuring targets of mobile phone 1
Range unit measures shooting distance using range unit, then by the camera on mobile phone 1 come measuring targets
It is shot, during shooting distance measurement, laser emitter 8 works, and issues laser to object under test, and to mobile phone 1
It is reflected back laser, and is received by laser pickoff 9, and generates electric signal, and to processor 5 is passed to, then 5 basis of processor
The transmitting of laser and received time interval, can be calculated the shooting distance of object under test, be transferred to mobile phone by data line
1, obtain the data of shooting distance, according on mobile phone 1 camera shooting object under test image and shooting distance, with
Image in image data base carries out analysis comparison, compares using shooting distance as condition entry, obtains nearest comparison diagram
Picture calculates to obtain object under test by the actual size of the dimension scale and contrast images of object under test image and contrast images
Actual size data, the actual size of final object under test then shown on mobile phone screen.
Embodiment 2: a method of the mobile phone for measuring size based on laser ranging and image comparison, the embodiment and implementation
The difference of example 1 is: the image that shooting is obtained carries out object under test feature extraction processing, then will be after object under test feature extraction
Image and image data base in image compare, as shown in Figure 7 and Figure 8, object under test feature extraction processing method is
Outer profile is added in the outside of the actual profile of object under test, adds Internal periphery in the inside of the actual profile of object under test, it will
Space between outer profile and Internal periphery is cut into many straight lines, and takes M point on the every line in N straight line, can obtain
The profile with least energy is found out according to snake model formula to M × N number of point bounded domain, then in the bounded domain, is obtained
To the actual profile of object under test, the feature extraction of object under test is realized.Using partial differential equation Image Segmentation Model by
Space between Internal periphery or outer profile is split, and is filtered with continuous differential to image, right with discrete gridding
Image process is directly analyzed.The present invention shoots object in mobile phone, after obtaining object under test image, image that will take the photograph
Object under test feature extraction processing is carried out, then the image after object under test feature extraction is stored in image data base.By to bat
The feature extraction processing that image carries out object under test is taken the photograph, the actual size profile of object under test can be accurately obtained, before avoiding
Interference of the profile of background or other objects to subsequent contrast's step, improves the precision of comparison.Further, described
The outside addition outer profile for the object under test that feature extraction processing can use, adds Internal periphery in the inside of object under test, will
Space between outer profile and Internal periphery is cut into many straight lines, and takes M point on the every line in N straight line, can obtain
The profile with least energy is found out according to snake model formula to M × N number of point bounded domain, then in the bounded domain, it is real
The feature extraction of existing object under test.
Snake model formula is
By following formula discretization
The energy for obtaining snake model point is
E(vi)=λ Eint(vi)+(1-λ)Eext(vi)
Wherein the energy theorem of the profile of least energy is
Embodiment 3: a method of the mobile phone for measuring size based on laser ranging and image comparison, the embodiment and implementation
The difference of example 2 is: object under test feature extraction processing method is to shooting image configuration energy functional；
It is unfolded using Taylor formula, can be arrived further according to step integration method；
The minimum for passing through the available energy functional number of interative computation again, asks the two-dimentional variation in image procossing
Topic, gradient descent flow can be expressed as
Analytic solutions are finally obtained, the contrast of image can be improved using this algorithm, increase the detail textures letter in image
Breath, analyzes clearly edge details, obtains the edge contour of each image, obtains the edge wheel of object under test in shooting image
Exterior feature realizes the feature extraction of object under test in shooting image.
Claims (10)
1. the method for the mobile phone for measuring size based on laser ranging and image comparison, which comprises the following steps:
(1) image for shooting the object of actual size and shooting distance known to multiple groups, the image deposit mobile phone that shooting is obtained
Image data base, and the shooting distance for shooting object is subjected to sorted generalization as condition entry；
(2) mobile phone is directed at object under test, starts the laser emitter of mobile phone, laser transmitter projects laser to determinand body surface
Face is simultaneously reflected back mobile phone, and shooting distance is calculated according to the laser reflection time in mobile phone；
(3) it is shot with mobile phone measuring targets, obtains object under test image；
(4) image of object under test and shooting distance are compared with the image in image data base, obtain closest to away from
From contrast images；
(5) according to the actual size of the dimension scale and contrast images of object under test image and contrast images, calculate to be measured
The actual size data of object；
(6) actual size of object under test is shown by mobile phone.
2. the method for the mobile phone for measuring size according to claim 1 based on laser ranging and image comparison, feature exist
In: in step (1), admission has the actual size data of image measured by n different shooting distances in described image database.
3. the method for the mobile phone for measuring size according to claim 1 or 2 based on laser ranging and image comparison, feature
Be: the obtained image of shooting be subjected to object under test feature extraction processing, then by after object under test feature extraction image with
Image in image data base compares.
4. the method for the mobile phone for measuring size according to claim 3 based on laser ranging and image comparison, feature exist
In: object under test feature extraction processing method is to add outer profile in the outside of the actual profile of object under test, in object under test
Actual profile inside add Internal periphery, the space between outer profile and Internal periphery is cut into many straight lines, and straight in N item
Take M point on every line in line, available M × N number of point bounded domain, then according to snake model public affairs in the bounded domain
Formula finds out the profile with least energy, obtains the actual profile of object under test, realizes the feature extraction of object under test.
5. the method for the mobile phone for measuring size according to claim 4 based on laser ranging and image comparison, feature exist
In: snake model formula is
It is by the energy that following formula discretization obtains snake model point
E(vi)=λ Eint(vi)+(1-λ)Eext(vi)
Wherein the energy theorem of the profile of least energy is
6. the method for the mobile phone for measuring size according to claim 3 based on laser ranging and image comparison, feature exist
In: object under test feature extraction processing method is to shooting image configuration energy functional；
It is unfolded using Taylor formula, can be arrived further according to step integration method；
Again by the minimum of the available energy functional number of interative computation, for the two-dimentional variational problem in image procossing,
Gradient descent flow can be expressed as
Analytic solutions are finally obtained, the edge contour of object under test in shooting image is obtained, realize object under test in shooting image
Feature extraction.
7. realizing the side such as the mobile phone for measuring size as claimed in any one of claims 1 to 6 based on laser ranging and image comparison
The device of method, the device are installed on mobile phone (1), it is characterised in that: including fixing sleeve (2), the fixing sleeve (2) is socketed in hand
The top of machine (1), the fixing sleeve (2) are equipped with through-hole (4) in the position just opposite with mobile phone (1) camera, and the one of through-hole (4)
Side is equipped with mounting cylinder (3), is equipped with bottom plate (7) in the mounting cylinder (3), is equipped with range unit, ranging on the bottom plate (7)
Device includes laser emitter (8), laser pickoff (9) and the processor (10) being fixed on bottom plate (7), the Laser emission
Device (8) and laser pickoff (9) are connect with processor (10) respectively, and the processor (10) is connected with data line (5), data line
(5) it is connect with mobile phone (1).
8. the device of the method for the mobile phone for measuring size according to claim 7 based on laser ranging and image comparison,
Be characterized in that: the range unit further includes the storage slot (11) for being fixed on bottom plate (7) side, storage slot (11) and processing
Device (10) is connected.
9. the device of the method for the mobile phone for measuring size according to claim 7 based on laser ranging and image comparison,
Be characterized in that: the top screw thread of the mounting cylinder (3) is equipped with top cover (6).
10. the device of the method for the mobile phone for measuring size according to claim 7 based on laser ranging and image comparison,
Be characterized in that: the fixing sleeve (2) is made of flexible plastic material.
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Application publication date: 20181221 |