CN102721404A - Non-contact distance measurement device using digital camera and measurement method - Google Patents
Non-contact distance measurement device using digital camera and measurement method Download PDFInfo
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- CN102721404A CN102721404A CN2012101866939A CN201210186693A CN102721404A CN 102721404 A CN102721404 A CN 102721404A CN 2012101866939 A CN2012101866939 A CN 2012101866939A CN 201210186693 A CN201210186693 A CN 201210186693A CN 102721404 A CN102721404 A CN 102721404A
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Abstract
The invention provides a non-contact small distance measurement method and device, which use a computer and a minitype digital camera. The device consists of a minitype camera and a computer provided with a multichannel video capture card, wherein the inside of the computer is also provided with a camera shooting and digital image processing program which is used for obtaining distance between the camera and a plane of a measured object, which is vertical to the optical axis of the camera. Because of adopting the minitype digital camera, the measurement system has the characteristics of small measurement device, small measured distance and convenience in expanding and can simultaneously measure multiple points.
Description
Technical field
The present invention relates to the digital picture measuring technique, especially a kind of contactless distance measuring equipment of minisize pick-up head and measuring method utilized.
Background technology
Along with the development of modern experimental technique, people improve constantly the demand of high precision, easy to use and cheap miniaturization distance measuring equipment.Present range measurement system can be divided into contact and contactless two kinds by measuring method, and contact type measurement is comparatively ripe measuring method, has higher precision and is easy to realize miniaturization simultaneously.But, therefore, require to use under the strict experiment condition at some owing to the reason of measuring method itself inevitably exerts an influence near the physical condition testee; And present contactless measuring system multi-purpose laser or ultrasound wave are as measuring media; Though overcome the deficiency that influences physical environment around the testee of contact type measurement and since laser generator and ultrasonic generator comparatively the miniaturization difficulties of costliness and two speciogenesis devices limited that it is widely-used.
Along with the development of CCD and CMOS photoelectronic imaging chip, digital camera head is to miniaturization, and the high resolving power direction develops rapidly.Compare with ultrasonic generator with laser generator, the digital camera head volume is littler, and low price, and easy to use is strong to adaptive capacity to environment, thereby uses it for the non-contact distance-measurement system applies and have a extensive future.
Therefore, need a kind of new technical scheme to address the above problem.
Summary of the invention
Expensive in order to solve existing non-contact distance-measurement system price, the shortcoming that volume is bigger the invention provides a kind of contactless distance measuring equipment and measuring method of using digital camera head; It is little to have measurement mechanism, and scalability is good, and is easy and simple to handle; Install and debug simply, the advantage that cost is low.
For achieving the above object, the present invention can adopt following technical scheme:
A kind of noncontact distance-measuring device that uses digital camera head comprises digital camera head and computing machine, and said digital camera head is connected with the interior video frequency collection card of computing machine.
Use the measuring method of the noncontact distance-measuring device of said use digital camera head to comprise the steps:
1), goes out circular reference marker perpendicular to the surface markers of digital camera head optical axis at testee;
2), the function digit camera is at the vertical image of taking the circular reference marker of a frame of known distance, preserve with the bitmap mode, as a reference frame; Select the big or small M * N of bitmap frame, wherein M, N ∈ positive integer according to the parameter index of concrete digital camera head;
3), repeating step 2), take the acquisition reference frame down with testee surface known distance taking the photograph digital picture head; According to the corresponding relation between circular reference marker number of pixels that maximum gauge strides across and the shooting distance in the existing reference frame; Go out in the reference frame circular reference marker institute covered pixels number through least square fitting and accomplish the calibration of measurement mechanism with the relation formula between the distance of testee.
4), in the actual measurement, calculate circular reference marker institute covered pixels point number in the bitmap frame that digital camera head takes, the substitution number of pixels is with the relation formula between the distance of testee, actual range between acquisition digital camera head and testee.
The invention has the beneficial effects as follows; It is that a kind of digital camera head that adopts is realized the new method and the device of noncontacting measurement distance as sensor, has given full play to the effect of the photosensor arrays of digital camera head, and it is little to have a measurement mechanism; Scalability is good; Easy and simple to handle, install and debug simply, the advantage that cost is low.
Description of drawings
Fig. 1 is the composition diagram of the contactless distance measuring equipment of the present invention.
Fig. 2 is the schematic side view of measured device in the embodiment of the invention.
Fig. 3 is the schematic top plan view of measured device in the embodiment of the invention.
Embodiment
Fig. 1 is a distance measuring equipment composition diagram of the present invention.Wherein miniature digital camera head 3 is aimed at measured object 5, and both distances are in miniature digital camera head 3 effective optical lens focal imaging scopes.Said minisize pick-up head 3 is by optical lens; Photoelectric sensor chip and video frequency collection card interface are formed; Interface through its configuration links to each other with multi-channel video capture card 2, and video frequency collection card 2 links to each other with generic computer system 1; This computer system 1 also disposes CPU, internal memory, display card and display, hard disk, keyboard and mouse, operating system, and capture card driver and the camera of writing are specially taken and the Digital Image Processing program.
Use the step of digital camera head measuring distance to comprise:
One, multi-channel video capture card 2 connects computer system 1 and digital camera head 3, and operation is with the capture card driver of capture card 2 the placings.
Two, keep surveying work environment intraoral illumination condition good and change that not influence camera circular with reference to 4 identification to testee 5 surfaces.
Three, camera is aimed at testee, and the good camera of focus adjustment makes that imaging is clear.
Four, the operation camera is taken and the Digital Image Processing program calibration system.
The method that said camera is taken and the Digital Image Processing program adopts is progressively narrated as follows:
1), under the known condition of distance between miniature digital camera head 3 and the testee 5, to take a frame testee 5 surfaces circular with reference to 4 image, be saved in the hard disk of computing machine 1 with the form of bitmap.Select the big or small M * N of bitmap frame according to the concrete model of digital camera head 3, M, N ∈ positive integer are selected shooting speed frame per second faster as far as possible.
2), confirm by digital imaging processing software captured with reference to circular in the bitmap frame with reference to 4 number of pixels that cover, obtain testee 5 apart from the distance of digital camera head 3 and circular with reference to 4 in reference to bitmap one group of data between the covering number of pixels.
3), repeating step 1); 2) several times (multiplicity>2) obtain the relation between the circular reference 4 in a series of measuring distance and the bitmap; Go out measuring distance and the function expression that covers number of pixels with reference to circular reference 4 in the bitmap through least square fitting, accomplish and demarcate.
4), find range, obtain in the bitmaps by digital camera head 3 circular with reference to 4 the number of pixels that covers, the function expression that substitution is demarcated, acquisition is the distance between miniature digital camera head 3 and the testee 5 at this moment.
The scaling method that above-mentioned measuring method adopts should be under the condition that allows; Demarcate several times more; Its basic thought is: the distance of demarcation possible minimum and maximum distance in the time of should comprising actual measurement, and in this scope, be uniformly distributed with as far as possible, the precision of demarcation affects the precision of measurement.
Above-mentioned measuring method can connect a plurality of miniature digital camera heads on the multi-channel video capture card, the realization multiple spot is measured in real time.
See also Fig. 2 and shown in Figure 3, be the embodiment that adopts this measuring method that a kind of device is measured.This device comprises restriction device 7 compositions of pipeline 6 and inner variable cross section; The center section of restriction device 7 is the variant part 8 that elastomeric material is processed; This variant part 8 can change area of section under different charge pressures; This measurement mechanism uses 6 minisize pick-up heads 9, and is circular with reference to 10 in the face of the prior mark in the surface of camera 9 at variant part 8.
Table 1 has provided each camera calibration data; Table 2 provides each camera calibration formula, and wherein x representes that camera records circular reference diameter pixel value, and y representes the distance (mm) between camera and the circular reference, in the actual measurement process, just can obtain the deflection of circular reference 10 under different conditions; Table 3 has provided each circular deflection that obtains restriction device with reference to 10 these measuring methods of use.
Table 1
| The camera sequence number | Calibration formula |
| 1 | y=-0.00053774?x 2+0.22463377x-14.65003823 |
| 2 | y=-0.00149587x 2+0.44200614x-26.16685955 |
| 3 | y=-0.00085185x 2+0.31423467x-21.23455482 |
| 4 | y=-0.00066914x 2+0.24260359x-15.35857144 |
| 5 | y=-0.00075259x 2+0.28446273x-18.49641916 |
| 6 | y=-0.00124495x 2+0.42641792x-24.82694371 |
Table 2
| The camera numbering | Circular reference diameter (/ pixel) | Deflection (mm) |
| 1 | 111.5 | 3.71181 |
| 2 | 116 | 4.977018 |
| 3 | 167 | 7.48679 |
| 4 | 117 | 3.86674 |
| 5 | 125.8 | 5.378612 |
| 6 | 92 | 3.865823 |
Table 3
Can find out that through above embodiment this measuring method is specially adapted to those to be had certain requirement to the measurement mechanism size and can't use the occasion of traditional contact measuring apparatus to use.
The present invention realizes that specifically the method for this technical scheme and approach are a lot, and the above only is a preferred implementation of the present invention.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.The all available prior art of each ingredient not clear and definite in the present embodiment realizes.
Claims (5)
1. noncontact distance-measuring device that uses digital camera head is characterized in that: comprise digital camera head (3) and computing machine (1), said digital camera head (3) is connected with the interior video frequency collection card (2) of computing machine (1).
2. according to the noncontact distance-measuring device of the said use digital camera head of claim 1, it is characterized in that: said computing machine (1) is furnished with camera and takes and the Digital Image Processing program.
3. according to the noncontact distance-measuring device of the said use digital camera head of claim 1, it is characterized in that: said video frequency collection card (2) connects multigroup numerical camera (3) simultaneously, realizes multimetering.
4. according to the noncontact distance-measuring device of the said use digital camera head of claim 3, it is characterized in that: said digital camera head (3) carries led light source and is convenient to find range at interior of articles.
5. use the measuring method of the noncontact distance-measuring device of the said use digital camera head of claim 1, it is characterized in that, comprise the steps:
1), goes out circular reference marker (4) perpendicular to the surface markers of digital camera head (3) optical axis at testee (5);
2), function digit camera (3) is at the vertical image of taking the circular reference marker of a frame (4) of known distance, preserve with the bitmap mode, as a reference frame; Select the big or small M * N of bitmap frame, wherein M, N ∈ positive integer according to the parameter index of concrete digital camera head (3);
3), repeating step 2), take the acquisition reference frame down with testee surface (5) known distance taking the photograph digital picture head (3); Based on the corresponding relation between circular reference marker (4) number of pixels that maximum gauge strides across and the shooting distance in the existing reference frame; Go out in the reference frame circular reference marker (4) institute covered pixels number with the relation formula between the distance of testee through least square fitting, accomplish the calibration of measurement mechanism;
4), in the actual measurement; Circular reference marker (4) institute covered pixels point number in the bitmap frame that calculating digital camera head (3) is taken; The substitution number of pixels obtains actual range between digital camera head (3) and testee (5) with the relation formula between the distance of testee.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103644865A (en) * | 2013-11-08 | 2014-03-19 | 广东出入境检验检疫局检验检疫技术中心 | Plane area measuring method based on digital image analysis |
| CN103673890A (en) * | 2013-11-08 | 2014-03-26 | 广东出入境检验检疫局检验检疫技术中心 | Length and cylindrical surface area measuring methods based on digital image analysis |
| CN106959076A (en) * | 2017-02-20 | 2017-07-18 | 广州视源电子科技股份有限公司 | Portrait distance detection method and system based on camera |
| CN108693807A (en) * | 2018-05-17 | 2018-10-23 | 中南林业科技大学 | A kind of data acquisition analysis system based on Internet of Things |
| CN109470201A (en) * | 2017-09-07 | 2019-03-15 | 罗伯特·博世有限公司 | Method for running laser range finder |
| CN111543935A (en) * | 2016-06-30 | 2020-08-18 | 卡尔蔡司光学国际有限公司 | Assembly, computer program, system and kit for determining a corrective lens |
| CN112465910A (en) * | 2020-11-26 | 2021-03-09 | 成都新希望金融信息有限公司 | Target shooting distance obtaining method and device, storage medium and electronic equipment |
| US11651675B2 (en) | 2018-02-02 | 2023-05-16 | Siemens Schweiz Ag | Safety device inspection |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673890A (en) * | 2013-11-08 | 2014-03-26 | 广东出入境检验检疫局检验检疫技术中心 | Length and cylindrical surface area measuring methods based on digital image analysis |
| CN103644865A (en) * | 2013-11-08 | 2014-03-19 | 广东出入境检验检疫局检验检疫技术中心 | Plane area measuring method based on digital image analysis |
| CN103644865B (en) * | 2013-11-08 | 2019-05-31 | 广东出入境检验检疫局检验检疫技术中心 | Plane area measuring method based on digital image analysis |
| CN103673890B (en) * | 2013-11-08 | 2019-05-31 | 广东出入境检验检疫局检验检疫技术中心 | Length and cylinder area measurement method based on digital image analysis |
| CN111543935A (en) * | 2016-06-30 | 2020-08-18 | 卡尔蔡司光学国际有限公司 | Assembly, computer program, system and kit for determining a corrective lens |
| CN111543935B (en) * | 2016-06-30 | 2024-04-09 | 卡尔蔡司光学国际有限公司 | Component, computer program, system, and kit for determining corrective lenses |
| CN106959076A (en) * | 2017-02-20 | 2017-07-18 | 广州视源电子科技股份有限公司 | Portrait distance detection method and system based on camera |
| CN109470201B (en) * | 2017-09-07 | 2022-05-27 | 罗伯特·博世有限公司 | Method for operating a hand-held laser distance measuring device and hand-held laser distance measuring device |
| CN109470201A (en) * | 2017-09-07 | 2019-03-15 | 罗伯特·博世有限公司 | Method for running laser range finder |
| US11651675B2 (en) | 2018-02-02 | 2023-05-16 | Siemens Schweiz Ag | Safety device inspection |
| CN108693807A (en) * | 2018-05-17 | 2018-10-23 | 中南林业科技大学 | A kind of data acquisition analysis system based on Internet of Things |
| CN108693807B (en) * | 2018-05-17 | 2021-06-22 | 中南林业科技大学 | Data acquisition and monitoring system based on Internet of things |
| CN112465910B (en) * | 2020-11-26 | 2021-12-28 | 成都新希望金融信息有限公司 | Target shooting distance obtaining method and device, storage medium and electronic equipment |
| CN112465910A (en) * | 2020-11-26 | 2021-03-09 | 成都新希望金融信息有限公司 | Target shooting distance obtaining method and device, storage medium and electronic equipment |
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Application publication date: 20121010 |