CN102497506B - Optical imaging scanning method for objects in nearly smooth areas - Google Patents
Optical imaging scanning method for objects in nearly smooth areas Download PDFInfo
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- CN102497506B CN102497506B CN201110403758.6A CN201110403758A CN102497506B CN 102497506 B CN102497506 B CN 102497506B CN 201110403758 A CN201110403758 A CN 201110403758A CN 102497506 B CN102497506 B CN 102497506B
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Abstract
The invention belongs to the technical field of optical imaging, and discloses an optical imaging scanning method for an object in a nearly smooth area. The method comprises a fixed-point rotating type multi-optical imaging system scanning mode, namely a plurality of sets of optical imaging systems are fixed on a one-dimensional turntable, and rotate along with the turntable for sector scanning which is transverse scanning. The optical imaging system comprises a video camera, a lens and illumination equipment. A fixed-point rotating type is that: the optical imaging systems are fixed on the one-dimensional turntable, and rotate along with the turntable, wherein the one-dimensional turntable can carry the optical imaging systems and horizontally rotate. Specifically, the method is implemented by fixing the plurality of sets of optical imaging systems on the one-dimensional turntable and making the optical imaging systems rotate along with the turntable for one-time sector scanning, and all scanning tasks are finished in a one-time sector scanning way from far scanning areas to near scanning areas. By the method, a problem about the optical imaging accurate scanning of the objects in the nearly smooth or smooth areas is solved, and foreign objects which are at least 5mm large can be identified by foreign object debris scanning on airport pavements.
Description
Technical field
The invention belongs to optical image technology field, relate to optical imagery scanning detection mode, particularly airfield pavement foreign body scan mode, the specifically optical imaging scanning method of object in a kind of nearly smooth region of object in a kind of nearly smooth region.
Background technology
Airport pavement foreign object FOD (Foreign Object Debris), gets final product certain external material, chip or the object that can damage aircraft or system.The kind of FOD is quite a lot of, as hard object, soft object, birds, thunder and lightning etc.FOD harm is very serious, and the exotic on airfield pavement can be easy to be inhaled into engine, causes power failure.Fragment also can be deposited in mechanical device, affects the normal operation of the equipment such as undercarriage, wing flap.FOD not only can wrap up, causes airplane crash and seizes valuable life, but also being accompanied by huge economic loss.The unplanned engine that changes itself is exactly expensive cost, says nothing of the loss that airliner delay or cancellation bring.According to conservative estimation, the loss that cause because of FOD in the annual whole world is at least at 3,000,000,000-4,000,000,000 dollars, exotic FOD not only can cause huge direct losses, also can cause airliner delay, abort, close the indirect losses such as runway, and indirect loss is at least 4 times of direct losses.
Existing airport pavement foreign object scanning device mainly adopts millimetre-wave radar technology and optical image technology.Millimetre-wave radar technology is exactly by millimeter wave scanning device transmitting millimeter wave beam scanning airfield pavement, road face and be attached to the foreign matter on face, after receiving millimeter-wave signal, can produce reflected signal, these signals are mixed and are received into mixing ripple by millimeter wave scanning means receiver, data handling system is by analysis and processing to mixing ripple signal, filter out after earth background angle echo, differentiate the foreign matter of engaging in this profession on face.Optical image technology is by the mode acquisition scans area image information of optical imagery and by computer software, knows method for distinguishing and differentiate road face foreign matter.
Summary of the invention
The optical imaging scanning method that the object of this invention is to provide object in a kind of nearly smooth region.
Nearly smooth region of the present invention is in region, to be greater than 0 degree with horizontal sextant angle to be less than or equal to 30 degree.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: in nearly smooth region, object is carried out to optical imagery scanning, adopt many optical imaging systems of fixed point rotary scan mode.Described optical imaging system comprises video camera, camera lens and lighting apparatus, described fixed point rotary is that optical imaging system is fixed on one dimension revolving-turret, optical imaging system rotates with turntable, and one dimension revolving-turret can bearing optical imaging system and carried out the rotation of horizontal cross, scans.
Further, described many optical imaging systems of fixed point rotary scan mode, for be fixed on one dimension revolving-turret and rotate by will overlap optical system more thereupon, is carried out a sectoring and is realized.
Further, thereby the scanning area realization that the optical imaging system of cover more than described scans respectively from the close-by examples to those far off completes whole scan tasks by a sectoring, overlaps the scanning from the close-by examples to those far off of optical imaging system difference more, can regard longitudinal scanning as.
For video acquisition system, the factor that affects scanning step mainly contains two aspects: the one, and transversal scanning step-length, be mainly subject to the restriction of optical system visual field, and system visual field is determined by resolution, so the resolution of selected optical imaging system, has determined the size of horizontal step-length.The 2nd, longitudinal scanning step-length, is mainly subject to the restriction of the optical system depth of field.The depth of field is along with object distance changes and changes, so longitudinal scanning step-length is a value that changes to gradually change with object distance.
At video acquisition system, transversal scanning step-length can be drawn by following relational expression by the restriction of optical system visual field,
The lateral length of the image-forming components such as wherein θ is field angle of object, and L is CCD, f
\focal length for optical system.
Yet the system angle of visual field determines by resolution, after the image-forming components such as CCD are selected, the resolution of imaging only depends on optical system focal distance f
\.
So the resolution of selected optical imaging system, has determined the size of horizontal step-length.
Longitudinal scanning step-length is subject to the restriction of the optical system depth of field, can be provided by following relational expression.
Wherein Δ L is the depth of field, f
\optical system focal length, D is relative aperture, L is object distance, the size that δ is disc of confusion.
The depth of field is along with object distance changes and changes, so longitudinal scanning step-length is a value that changes to gradually change with object distance.Arranging of each optical imaging system in many optical imaging systems, determines according to longitudinal scanning step-length.Therefore the arrangement mode of fixed optics imaging system is determined by longitudinal scanning step-length, with object distance, changes and gradually changes.
The beneficial effect of the invention is: in nearly smooth region of the present invention, the optical imagery scan mode of object provides two kinds for scan mode that in nearly smooth or smooth region, object uses optical imagery to scan it.Apply the present invention to corresponding airfield pavement foreign body monitoring equipment, 5 millimeters of foreign matters of I identification.
Accompanying drawing explanation
Fig. 1 is three optical imaging system scanning area cutaway views of many optical imaging systems of fixed point rotary scan mode of the present invention.In figure, L1 is the distance of video camera and the first scanning area near point, and L2 is the distance of video camera and the first scanning area far point, and L3 is the distance of video camera and the second scanning area far point, and L4 is the distance of video camera and the 3rd scanning area far point.
Fig. 2 is three optical imaging system scanning area vertical views of many optical imaging systems of fixed point rotary scan mode of the present invention.In figure, H scanning area width, L scanning area length, L1 is the distance of video camera and the first scanning area near point, L2 is the distance of video camera and the first scanning area far point, and L3 is the distance of video camera and the second scanning area far point, and L4 is the distance of video camera and the 3rd scanning area far point.
Fig. 3 is three optical imaging system scanning process schematic diagrames of many optical imaging systems of fixed point rotary scan mode of the present invention, and in figure, 0 is video camera present position, and ∠ AOB, ∠ BOC are adjacent two scanning steps.
Embodiment
Below in conjunction with accompanying drawing, scanning process of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
It is example that many optical imaging systems of fixed point rotary scan mode be take the airfield pavement sector scanning that three optical imaging systems are respectively L, H to length and width, as shown in Figure 1, longitudinally be divided into four regions, in video camera L1, be wherein non-scanning area, mainly by lawn, equipment installation region, part road surface beyond curb, formed.L1～L2, L2～L3, tri-regions of L3～L4 are aimed at and are scanned with three optical imaging systems respectively, the first optical imaging system is aimed at L1～L2 region and is scanned, the second optical imaging system is aimed at L2～L3 region and is scanned, and the 3rd optical imaging system is aimed at L3～L4 region and scanned.As can be seen from Figure 2 L2 is the maximum scan radius of the first optical imaging system, and L3 is the maximum scan radius of the second optical imaging system, and L4 is the maximum scan radius of the 3rd optical imaging system.The image scanning region of three kinds of respectively corresponding three optical imaging systems in different shadow regions in Fig. 2, optical imaging system is only respectively the rectangular scanning region collection vision signal of L and H with regard to length and width, video acquisition is not done in region beyond rectangular area, and the scanning area gross area is L * H.Wherein rectangular scanning region gathers vision signal width H and can be used as airfield pavement width.In Fig. 3 ∠ OAB corresponding fan-shaped be a scanning step, ∠ OBC is next step-length, to be scanning step determine according to the resolution of used optical imaging system the size of ∠ OAB, ∠ OBC.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. the optical imaging scanning method of object in nearly smooth region, is characterized in that: in region and horizontal sextant angle are greater than the near smooth region that 0 degree is less than or equal to 30 degree, adopt many optical imaging systems of fixed point rotary scan mode; Described optical imaging system comprises video camera, camera lens and lighting apparatus, described fixed point rotary is that optical imaging system is fixed on one dimension revolving-turret, optical imaging system rotates with turntable, and one dimension revolving-turret can bearing optical imaging system and carried out the rotation of horizontal cross;
Described many optical imaging systems of fixed point rotary scan mode is for be fixed on one dimension revolving-turret and rotate and carry out a sectoring and realize by will overlap optical system more thereupon; Thereby the scanning area realization that described many cover optical imaging systems scan respectively from the close-by examples to those far off completes whole scan tasks by a sectoring;
Because transversal scanning step-length is mainly subject to the restriction of optical system visual field, and optical system visual field is determined by resolution, so laterally the size of step-length is determined according to the resolution of selected optical imaging system; Because longitudinal scanning step-length is mainly subject to the restriction of the optical system depth of field, and the depth of field is along with object distance changes and changes, so longitudinal scanning step-length changes according to object distance and gradually changes;
The first optical imaging system is aimed at L1～L2 region and is scanned, the second optical imaging system is aimed at L2～L3 region and is scanned, the 3rd optical imaging system is aimed at L3～L4 region and is scanned, wherein, L2 is the maximum scan radius of the first optical imaging system, L3 is the maximum scan radius of the second optical imaging system, and L4 is the maximum scan radius of the 3rd optical imaging system, and described L1 is the distance of video camera and the first scanning area near point.
2. the optical imaging scanning method of object in nearly smooth region according to claim 1, is characterized in that optical imaging system, to the long L and wide for scanning the rectangular area of H of being, gathers vision signal.
3. the optical imaging scanning method of object in nearly smooth region according to claim 1, is characterized in that airfield pavement foreign body to scan, and the scanning width H that gathers vision signal equates with airfield pavement width.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101011243A (en) * | 2007-01-30 | 2007-08-08 | 华南师范大学 | Foreign body detecting method using thermoacoustic imaging and device thereof |
| CN201754190U (en) * | 2010-03-09 | 2011-03-02 | 高国华 | Laser scanning, detecting and imaging system for road surface |
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| EP1712931A1 (en) * | 2005-04-14 | 2006-10-18 | Qinetiq Limited | Method and apparatus for detecting a target in a scene |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101011243A (en) * | 2007-01-30 | 2007-08-08 | 华南师范大学 | Foreign body detecting method using thermoacoustic imaging and device thereof |
| CN201754190U (en) * | 2010-03-09 | 2011-03-02 | 高国华 | Laser scanning, detecting and imaging system for road surface |
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