CN102494616A - Length measuring device based on mobile terminal and method thereof - Google Patents
Length measuring device based on mobile terminal and method thereof Download PDFInfo
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Abstract
A length measuring device based on a mobile terminal is used with a datum length element and comprises a camera unit and a computing unit. The length of the datum length element is known. The camera unit is used for taking pictures of the datum length element and an article to be measured, and the computing unit is used for computing the number of pixel points in the images of the datum length element and the article to be measured and then computing the length of the article to be measured according to the length of the datum length element. Accordingly, length measurement is realized by the image processing technology, addition of hardware arrangement of the mobile terminal is omitted, and convenience and interest in use of the mobile terminal are enhanced.
Description
Technical field
The invention belongs to field of electronics, be meant a kind of apparatus and method of utilizing portable terminal to carry out linear measure longimetry especially.
Background technology
Along with the development of mechanics of communication, the function of mobile phone is just becoming from strength to strength, for example counts the step, measures blood pressure or carries out long-range functions such as tame electric control through mobile phone, thereby greatly facilitate people's life.
Yet in actual life; The user possibly also have some demands of measuring length; Therefore if portable terminal capable of using carries out measurement of length then can increase the function and the attractive force of portable terminal undoubtedly; Industry also proposes some and utilizes portable terminal to carry out the scheme of linear measure longimetry; Specifically shown in Chinese patent 200620016720.8,201020669994.3,200810302172.9 etc., but these schemes all need be provided with traditional measurement mechanisms such as tape measure separately, are the cost that can increase portable terminal so on the one hand.
Therefore, be necessary to provide a kind of apparatus and method of utilizing portable terminal to carry out linear measure longimetry in fact.
Summary of the invention
The object of the invention is to provide a kind of length-measuring appliance and method based on portable terminal, increases the problem of mobile terminal cost in order to solve in the prior art through traditional measurement mechanisms such as tape measure are set.
For realizing above-mentioned purpose, realize that a length-measuring appliance and the datum length element based on portable terminal of the present invention is used, the length of this datum length element is known, and the length-measuring appliance based on portable terminal of embodiment of the present invention comprises:
Image unit is used to take the image of datum length element and object under test;
Computing unit calculate the pixel number that image comprised of datum length element and object under test, and the length gauge of benchmark length element is calculated the length of object under test.
According to above-mentioned principal character; Should also comprise an input block based on the length-measuring appliance of portable terminal; Photograph the image of datum length element and object under test at image unit after; Computing unit receive input block input order and confirm to represent the image of object under test and the image of datum length element, thereby computing unit is added up the number of respective image edge pixel.
According to above-mentioned principal character, this image unit is the camera of this portable terminal, and computing unit is the baseband processing chip of portable terminal.
According to above-mentioned principal character, this image unit is the camera of YUV422 standard, and the color of each pixel and brightness are represented by 8 bit data wherein; Comprise Y, U, V totally 3 types of data, wherein Y has four, and U has two; V has 2, and form is: Y0U0Y1V0Y2U1Y3V1, computing unit add up carrying out pixel; If respectively there is the one digit number value different in the Y of adjacent two pixels, U, the V data, then the statistical value with number of pixels adds one.
According to above-mentioned principal character; The shared pixel number of image of computing unit statistics datum length element; Obtain the length value of each pixel representative divided by this number through the length of datum length element; Thereby the shared pixel number of the image that counts object under test again multiply by the unit length value more afterwards and draws the length of object under test.
For realizing above-mentioned purpose, the present invention proposes a kind of above-mentioned method of carrying out linear measure longimetry based on the length-measuring appliance of portable terminal of utilizing, and this method comprises the steps:
Take the image of datum length element and object under test through image unit;
Computing unit calculates the pixel number that image comprised of datum length element and object under test, and the length gauge of benchmark length element is calculated the length of object under test.
According to above-mentioned principal character; Should also comprise an input block based on the length-measuring appliance of portable terminal; Photograph the image of datum length element and object under test at image unit after; Computing unit receive input block input order and confirm to represent the image of object under test and the image of datum length element, thereby computing unit is added up the number of respective image edge pixel.
According to above-mentioned principal character, this image unit is the camera of YUV422 standard, and the color of each pixel and brightness are represented by 8 bit data wherein; Comprise Y, U, V totally 3 types of data, wherein Y has four, and U has two; V has 2, and form is: Y0U0Y1V0Y2U1Y3V1, computing unit add up carrying out pixel; If respectively there is the one digit number value different in the Y of adjacent two pixels, U, the V data, then the statistical value with number of pixels adds one.
According to above-mentioned principal character; The shared pixel number of image of computing unit statistics datum length element; Obtain the length value of each pixel representative divided by this number through the length of datum length element; Thereby the shared pixel number of the image that counts object under test again multiply by the unit length value more afterwards and draws the length of object under test.
According to above-mentioned principal character; When computing unit is added up the shared pixel of the image of object under test; The difform image of pin adopts diverse ways; Wherein for the image that is single pixel, if respectively have the one digit number value different among the Y of adjacent two pixels, U, V data, then the statistical value with number of pixels adds one; For the image that is two row's pixels, then obtain the rough estimates value according to above-mentioned method, obtain the shared pixel number of physical length divided by two afterwards; For arranging the image of number greater than two; Obtain the shared pixel number of the girth A=2a+2 (b-2) of image earlier; Wherein a representes the shared pixel number of many row's image length directions; B representes the shared pixel number of many row's picture traverse directions, so can derive many row image length direction shared pixel number a=(A-2 (b-2))/2; For the image that is irregular figure; Need to judge earlier that its width is that the still many row's pixels of single pixel just can be according to above-mentioned two kinds of mode statistical computations to the final shared pixel number of length a; If exist 45 degree oblique angles to connect pixel, suppose that this pixel has N, introduce the correction of 2^ (1/2) when then adding up; Through formula a '=a+ (2^ (1/2)-1) N, thereby draw the shared pixel number of final length a '.
Compared with prior art; The present invention obtains the image of datum length element and object under test through the image unit of portable terminal; Calculate the pixel number that image comprised of datum length element and object under test afterwards, and the length gauge of benchmark length element calculates the length of object under test, so realize measuring the function of length through image processing techniques; Need not increase the hardware setting of portable terminal, increase the convenience and interest that portable terminal uses thereby be beneficial to.
Description of drawings
Fig. 1 is the functional module structure synoptic diagram based on the length-measuring appliance of portable terminal of embodiment of the present invention.
Fig. 2 is the process flow diagram based on the length measurement method of portable terminal.
Fig. 3 is an enforcement synoptic diagram of the present invention.
Fig. 4 is the synoptic diagram that is the image of single pixel.
Fig. 5 is the synoptic diagram that is the image of many row's pixels.
Fig. 6 has 45 degree oblique angles to connect the synoptic diagram of the image of pixel.
Embodiment
Be elaborated below in conjunction with the embodiment of accompanying drawing to embodiment of the present invention.
See also shown in Figure 1; Functional module structure synoptic diagram for embodiment of the present invention based on the length-measuring appliance of portable terminal; The length-measuring appliance based on portable terminal of embodiment of the present invention is used with a datum length element in use usually; The length of this datum length element is known, and the length-measuring appliance based on portable terminal of embodiment of the present invention comprises:
Image unit is used to take the image of datum length element and object under test;
Computing unit calculate the pixel number that image comprised of datum length element and object under test, and the length gauge of benchmark length element is calculated the length of object under test.
In the specific implementation, above-mentioned datum length element can be the vertical small hanging of when buying portable terminal, giving together, and its length is for fixing known, or pointer, or the known object of other length.And image unit is the camera of this portable terminal, and computing unit can be the baseband processing chip of portable terminal, and so the present invention does not need extra element, thereby is easier to implement.In addition; The length-measuring appliance based on portable terminal of embodiment of the present invention also comprises an input block; This input block can be the man-machine inputting interface (like button or touch-screen etc.) of portable terminal; Photograph the image of datum length element and object under test at image unit after, computing unit receive input block input order and confirm to represent the image of object under test and the image of datum length element, thereby computing unit is added up the number of respective image edge pixel.
See also shown in Figure 2ly, be the process flow diagram based on the length measurement method of portable terminal of embodiment of the present invention, the length measurement method based on portable terminal of embodiment of the present invention comprises the steps:
Take the image of datum length element and object under test through image unit;
Computing unit calculates the pixel number that image comprised of datum length element and object under test, and the length gauge of benchmark length element is calculated the length of object under test.
See also shown in Figure 3; Be enforcement synoptic diagram of the present invention, wherein, obtain the length value u of each pixel representative divided by this number through the length of datum length element as long as add up the shared pixel number of image of datum length element; Thereby the shared pixel number of the image that counts object under test again; Multiply by unit length value u afterwards again, just can draw the length of object under test, realize the function of linear measure longimetry thus.
In the specific implementation; If the camera with YUV422 standard commonly used at present is an example; Its image transmitted in preview and imaging process all is made up of pixel one by one, and the color of each pixel and brightness represent that by 8 bit data wherein form is: Y0U0Y1V0Y2U1Y3V1.Therefore, according to this technical characterstic, we can add up the shared pixel of the object edge in the appointed area; Promptly adjacent two picture element point chromatic brightness have obvious difference in the appointed area, in the specific implementation, because background and bigger the measuring of measured object color contrast are chosen in the test process suggestion; So represent the Y of color and brightness in the data bit respectively, U, the V value has obvious difference; So generally can be with corresponding Y (4), U (2) respectively has one digit number value pixels with different just to regard as obvious difference in 3 types of data of V (2); Just the statistical value with number of pixels adds one, and according to the imaging characteristics of testee, the statistical value of number of pixels is handled; Last according to the shared pixel number of the image of datum length element, draw the physical length of object under test.
Because testee profile and imaging are uncertain, its shared pixel mode in imaging back is not unique, and is different to the statistical of its shared pixel for different imaging characteristicses yet, specific as follows shown in:
(1) for the image that is single pixel
As shown in Figure 4; For the image that is single pixel; Only need in the appointed area, obvious difference be arranged adjacent two picture element point chromatic brightness, the concrete standard of judging is the same, and just the statistical value with number of pixels adds one; So each pixel does not repeat contrast and statistics, and this statistical value is the shared pixel number of physical length.
(2) for the image that is many row's pixels
As shown in Figure 5, for the image that is many row's pixels, the account form of pixel then need be calculated on the basis of single pixel statistical.For example, the image for having only two row's pixels then obtains the shared pixel number of physical length with the rough estimates value divided by two; For arranging the image of number greater than two; At present to add up actual that many rows' images obtain be the shared pixel number of the girth A of many row's images to single statistical method; So need calculate the shared pixel number of many row's image length directions to it; Promptly by the shared pixel number of girth A=2a+2 (b-2); Wherein a representes the shared pixel number of many row's image length directions, and b representes the shared pixel number of many row's picture traverse directions, so can derive the shared pixel number of length a=(A-2 (b-2))/2.
(3) for the image that is irregular figure
As shown in Figure 6, for the image of irregular shape, only need to judge that its width is that the still many row's pixels of single pixel just can be according to the aforesaid way statistical computation to the final shared pixel number of length a.Wherein for existing 45 degree oblique angles to connect pixel, suppose to have N, the correction that can introduce 2^ (1/2) when then adding up makes statistical value more accurate, and concrete formula is a '=a+ (2^ (1/2)-1) N, thereby draws the shared pixel number of final length a '.
In practical application; Because camera has distant effect; So preferably object under test and datum length element are placed on same surface level; The image unit visual angle is perpendicular to this plane, and selection and object under test and the bigger background of datum length element aberration, improves the accuracy rate of imaging back pixel statistics.Whole process also needs man-machine interaction; In the captured image of image unit, point out to represent the color lump of object under test and the color lump of datum length element; Thereby computing unit is added up along the number of pixel to corresponding color lump graph edge; Draw shared pixel number of object under test physical length and the shared pixel number of datum length element physical length; Computing unit obtains the length of unit picture element point representative according to the fixed-length value of preset datum length element and the pixel number of the image of the datum length element that records, and further obtains the physical length (the pixel number that is the image of object under test multiply by unit picture element point length) of determinand.
It is understandable that, concerning those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. the length-measuring appliance based on portable terminal is used with a datum length element, and the length of this datum length element is known, it is characterized in that this length-measuring appliance based on portable terminal comprises:
Image unit is used to take the image of datum length element and object under test;
Computing unit calculate the pixel number that image comprised of datum length element and object under test, and the length gauge of benchmark length element is calculated the length of object under test.
2. the length-measuring appliance based on portable terminal as claimed in claim 1; It is characterized in that: should also comprise an input block based on the length-measuring appliance of portable terminal; Photograph the image of datum length element and object under test at image unit after; Computing unit receive input block input order and confirm to represent the image of object under test and the image of datum length element, thereby computing unit is added up the number of respective image edge pixel.
3. the length-measuring appliance based on portable terminal as claimed in claim 1 is characterized in that: this image unit is the camera of this portable terminal, and computing unit is the baseband processing chip of portable terminal.
4. the length-measuring appliance based on portable terminal as claimed in claim 3 is characterized in that: this image unit is the camera of YUV422 standard, and the color of each pixel and brightness are represented by 8 bit data wherein; Comprise Y, U, V totally 3 types of data; Wherein Y has four, and U has two, and V has 2; Form is: Y0U0Y1V0Y2U1Y3V1; Computing unit is added up carrying out pixel, if respectively have the one digit number value different among the Y of adjacent two pixels, U, V data, then the statistical value with number of pixels adds one.
5. the length-measuring appliance based on portable terminal as claimed in claim 1; It is characterized in that: the shared pixel number of image of computing unit statistics datum length element; Obtain the length value of each pixel representative divided by this number through the length of datum length element; Thereby the shared pixel number of the image that counts object under test again multiply by the unit length value more afterwards and draws the length of object under test.
6. one kind is utilized the described method of carrying out linear measure longimetry based on the length-measuring appliance of portable terminal of claim 1, it is characterized in that this method comprises the steps:
Take the image of datum length element and object under test through image unit;
Computing unit calculates the pixel number that image comprised of datum length element and object under test, and the length gauge of benchmark length element is calculated the length of object under test.
7. method as claimed in claim 6; It is characterized in that: should also comprise an input block based on the length-measuring appliance of portable terminal; Photograph the image of datum length element and object under test at image unit after; Computing unit receive input block input order and confirm to represent the image of object under test and the image of datum length element, thereby computing unit is added up the number of respective image edge pixel.
8. method as claimed in claim 6 is characterized in that: this image unit is the camera of YUV422 standard, and the color of each pixel and brightness are represented by 8 bit data wherein; Comprise Y, U, V totally 3 types of data, wherein Y has four, and U has two; V has 2, and form is: Y0U0Y1V0Y2U1Y3V1, computing unit add up carrying out pixel; If respectively there is the one digit number value different in the Y of adjacent two pixels, U, the V data, then the statistical value with number of pixels adds one.
9. method as claimed in claim 8; It is characterized in that: when computing unit is added up the shared pixel of the image of object under test; The difform image of pin adopts diverse ways; Wherein for the image that is single pixel, if respectively have the one digit number value different among the Y of adjacent two pixels, U, V data, then the statistical value with number of pixels adds one; For the image that is two row's pixels, then obtain the rough estimates value according to above-mentioned method, obtain the shared pixel number of physical length divided by two afterwards; For arranging the image of number greater than two; Obtain the shared pixel number of the girth A=2a+2 (b-2) of image earlier; Wherein a representes the shared pixel number of many row's image length directions; B representes the shared pixel number of many row's picture traverse directions, so can derive many row image length direction shared pixel number a=(A-2 (b-2))/2; For the image that is irregular figure; Need to judge earlier that its width is that the still many row's pixels of single pixel just can be according to above-mentioned two kinds of mode statistical computations to the final shared pixel number of length a; If exist 45 degree oblique angles to connect pixel, suppose that this pixel has N, introduce the correction of 2^ (1/2) when then adding up; Through formula a '=a+ (2^ (1/2)-1) N, thereby draw the shared pixel number of final length a '.
10. method as claimed in claim 6; It is characterized in that: the shared pixel number of image of computing unit statistics datum length element; Obtain the length value of each pixel representative divided by this number through the length of datum length element; Thereby the shared pixel number of the image that counts object under test again multiply by the unit length value more afterwards and draws the length of object under test.
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| CN105444678A (en) * | 2015-11-09 | 2016-03-30 | 佛山绿怡信息科技有限公司 | Handset size measurement method and system |
| CN105737742A (en) * | 2016-04-19 | 2016-07-06 | 南京工程学院 | Height measuring method based on image processing |
| CN105872478A (en) * | 2016-05-30 | 2016-08-17 | 苏州铭冠软件科技有限公司 | Agricultural intelligent analyzing and monitoring method based on image processing |
| CN106949830A (en) * | 2016-06-24 | 2017-07-14 | 广州市九州旗建筑科技有限公司 | The measuring technology and its computational methods of scale built in a kind of imaging system and application |
| CN106123784B (en) * | 2016-07-22 | 2019-03-15 | 广东小天才科技有限公司 | method and device for measuring length |
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