CN102411157A - Method and device for unilaterally scanning object and bilaterally and stereoscopically imaging - Google Patents

Abstract

The invention discloses a method and device for unilaterally scanning an object and bilaterally and stereoscopically imaging. The device is characterized by comprising a radiation source, a multi-slit ray collimator, multi-array radiation detectors arranged in the form of certain visual angle difference, a signal processing circuit and a front-end computer of the multi-array radiation detectors, a host computer and a 3D (three-dimensional) display, wherein, the array detectors are spaced and face towards the radiation source with different visual angles. The method for bilaterally and stereoscopically imaging comprises the following steps of: unilaterally scanning the detected object once by the radiation source, taking an image from the left detector of any pair of the array detectors as a left eye image, and taking an image from the right detector as a right eye image so as to show a forward-looking 3D image; horizontally turning over the images from the left detector and the right detector to be respectively taken as a left eye image and a right eye image so as to show a backward-looking 3D image; and combining the forward-looking 3D image with the backward-looking 3D image so as to jointly form the bilateral stereoscopic image. The method and the device disclosed by the invention have the advantages that the bilateral stereoscopic perspective image can be obtained only by unilaterally scanning the object for once during detection, thus being applicable to bilateral stereoscopic perspective detection on containers, vehicles, goods and the like.

Description

The method and the device of the one-sided scanning bilateral of object three-dimensional imaging

Technical field

The invention belongs to the radiant image technical field; Be particularly related to a kind of method and apparatus that object is carried out one-sided ray scanning realization bilateral three-dimensional imaging; Be called for short " bilateral stereoscopic imaging apparatus " or " bilateral 3D imaging device ", the bilateral volume rendering that is used for container, vehicle and goods etc. detects.

Background technology

The existing radiant image pick-up unit that is used for detected set vanning, vehicle and other objects; Produce the radiation source (accelerator, X-ray machine or radioactive isotope) of ray and the detector array that row receive ray with one; Checked object is carried out transmission scan, can obtain the bidimensional fluoroscopy images.Because multi-layer body overlaps each other, be difficult for identification in fluoroscopy images; More be difficult to differentiate its depth position.Existing a kind of quadrature imaging technique, scans object respectively with a radiation source and a row detector at orthogonal directions simultaneously.But the volume and the cost of this quadrature imaging system are multiplied, and come recognition object also relatively to require great effort through two width of cloth rectangular projection images of object.Adopt the CT technology can obtain true 3-D view, but CT imaging requirements radiation source and detector carry out spiral scan around container, vehicle or goods, complex structure, volume is bigger, and cost is higher; Also be difficult to satisfy the requirement of fast detecting on the speed.

Summary of the invention

The objective of the invention is to propose a kind of, just can obtain the device of the three-dimensional radiant image of bilateral through object (for example container, vehicle and goods) is carried out one-sided quick scanning.This apparatus structure is simple, and only needing increases by row (or multiple row) detector and a software on the basis of existing conventional system (radiation source and a row detector), just can become the bilateral stereo imaging system.Detection speed is the same fast with existing container or article detection system, carries out once rectilinear scanning fast, just can obtain to be equivalent to the stereo-picture of the perspective from the object both sides and the dynamic solid demonstration of rotary oscillation or depth of field variation.Help to show the mutual alignment of overlapping object especially, discern and locate.

Technical scheme of the present invention is; The method and the device of the one-sided scanning bilateral of a kind of object three-dimensional imaging; This device comprises radiation source, stitch ray collimator, line up signal processing circuit and front-end computer, principal computer and software, the 3D display of many arrays radiation detector, many arrays radiation detector of certain subtense angle more, and described radiation source and many seam ray collimators place a side of object to be detected; Many arrays radiation detector places the opposite side of object to be detected, is connected with signal processing circuit and front-end computer, principal computer and software, 3D display, and each detector array is at regular intervals each other, with different visual angles towards radiation source.

The method and the device of the one-sided scanning bilateral of a kind of object of the present invention three-dimensional imaging, the method step of its one-sided scanning bilateral three-dimensional imaging is:

⑴ radiation source carries out single pass in object to be detected one side, and as left-eye image, the image of right detector demonstrates the forward sight 3D rendering as eye image with the left detector image of arbitrary array detector;

⑵ carry out behind the flip horizontal the left detector image of arbitrary array detector as left-eye image, and the image of right detector carries out behind the flip horizontal demonstrating the backsight 3D rendering as eye image;

Constitute the bilateral stereo-picture by forward sight 3D rendering and backsight 3D rendering.

The method and the device of the one-sided scanning bilateral of a kind of object of the present invention three-dimensional imaging, realize that the method that stereo-picture dynamically shows is:

⑴ show different visual angles through circulation but have the stereo-picture of the paired detector array of same view angle difference that the dynamic 3D that carries out the object rotary oscillation shows;

⑵ carry out the dynamic 3D demonstration that the object depth of field changes through the stereo-picture of the paired detector array of circulation demonstration different visual angles difference.

Advantage of the present invention is, only needs during detection carry out single pass in object one side, just can obtain bilateral volume rendering image.Greater than 2 o'clock, can show the dynamic solid image that the rotary oscillation or the depth of field change at the detector array columns, make the testing staff depth position of the overlapping object of identification easily.The present invention is applicable to that the bilateral volume rendering of container, vehicle and goods etc. detects.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the present invention is further described.

Fig. 1 is the synoptic diagram of the one-sided scanning bilateral of a kind of object of the present invention stereoscopic imaging apparatus

Fig. 2 is a bilateral three-dimensional imaging display effect synoptic diagram

Fig. 2-A, the forward sight 3D rendering signal of looking sideways from ray incident

Fig. 2-B, the backsight 3D rendering signal of looking sideways from the ray outgoing

Fig. 3 is the synoptic diagram of the one-sided scanning bilateral of a kind of object of the present invention stereoscopic imaging method

Fig. 3-A, three-dimensional radiation imaging apparatus vertical view

Fig. 3-B, three-dimensional radiation imaging apparatus front elevation

Fig. 3-C, forward sight 3D rendering (being assumed to be the visible light 3D rendering)

Fig. 3-D, forward sight 3D rendering (3D rendering of transmitted ray, thick square frame is the ray exit facet; )

The mirror image of Fig. 3-E, forward sight 3D rendering shows

Fig. 3-F, backsight 3D rendering

Fig. 4 is the 3D imaging synoptic diagram before left and right sides detector image exchanges and after exchanging

3D imaging synoptic diagram before Fig. 4-A, the exchange,

3D imaging synoptic diagram after Fig. 4-B, the exchange

Fig. 5 is the product process figure of 2D-3D image

Fig. 6 is the screen associating displayed map of 2D-3D image

Fig. 7 is that dynamic 3D shows one of synoptic diagram (rotation of the 3D rendering of the same depth of field shows)

Fig. 8 is two (the dynamic demonstrations of the 3D rendering of the different depth of field) that dynamic 3D shows synoptic diagram

Fig. 9 is the 3 d display device of the employing eyes liquid crystal display of three-dimensional imaging

Figure 10 is the 3D display of the employing bore hole display screen of three-dimensional imaging

Among the figure, 1-radiation source, 2-stitch collimating apparatus, 3-various visual angles fan beams more; 4-object to be detected, 5-multiple row radiation detector, 5-R-right radiation detector, 5-L-left radiation detector; 6-multiple row signal processor, 7-multiple row Flame Image Process front-end computer, 8-principal computer, 9-3D display; 10-headstock synoptic diagram, the object image in the 11-left detector image, the object image in the 12-right detector image, the object in 13-3D rendering; 14-left eye, 15-right eye, 16-eyes 3D LCDs, 17-bore hole 3D display screen

Embodiment

By Fig. 1It is thus clear that; The one-sided scanning bilateral of a kind of object stereoscopic imaging apparatus; Comprise radiation source (accelerator, X-ray machine or radioactive isotope) 1, provide various visual angles fan beam 3 (each fan beam is perpendicular to paper), inject a plurality of detector arrays 5 respectively through collimating apparatus 2; Adjacent fan beam has certain angle q, is called basic subtense angle.Radiation source and multi-array detector carry out single pass to object to be detected 4, and the signal that each row detector receives is the same as with existing conventional system signal processor 6, in front-end computer 7, generate the two dimensional image (2D image) of each different visual angles.Principal computer 8 utilizes 3D software that each of adjacent visual angle is presented on the three-dimensional display (3D display) 9 image one by one.3D display 9 can be common graphoscope, watches through the 3D glasses; Or helmet-type 3D display; It also can be bore hole 3D display screen.The design sketch of bilateral three-dimensional imaging as Fig. 2Shown in, Fig. 2-A is the forward sight 3D rendering signal of looking sideways from ray incident, Fig. 2-B is the backsight 3D rendering signal of looking sideways from the ray outgoing.

Bilateral stereoscopic imaging method of the present invention as Fig. 3Shown in; Utilize radiation absorption only relevant and still be the principle that has nothing to do of outgoing when only considering main transmission information (take no account of scattering and) along path incident with the mass thickness in path; Can realize the bilateral three-dimensional imaging through the beam reorganization only with the scan-data of a side.Fig. 3 is the ultimate system that adopts a radiation source and two row detectors, and radiation source 1 is in a side of object to be detected 4, and left detector 5-L and right detector 5-R are in the opposite side of object to be detected 4, is q to the subtense angle of radiation source.When this system scans object to be detected 4; In a horizontal plane of object to be detected 4, the transmission path that gets into the beam (solid line) of left detector 5-L and get into the beam (dotted line) of right detector 5-R is that angle is two groups of parallel lines (Fig. 3-A) of q.Object is from detector in the case

Far away more, the mistiming of detecting it through detector about when scanning is big more, and the horizontal level difference of object in the detector image of the left and right sides is big more; The information basis of generation stereoscopic vision that Here it is.Scan if radiation source and detector are changed to the object to be detected opposite side, the transmission path of beam in this plane of object to be detected 4 also is that angle is two groups of parallel lines of q.So, in the surface level of object to be detected 4, the data of side scanning are suitably recombinated, can be used as the data of opposite side scanning.But (Fig. 3-B), the raypath when scanning in the object to be detected both sides respectively is also inequality, and they are open to the direction of detector separately in the vertical plane of object to be detected 4.Because big than the object of being close to detector on projected image from detector object far away, be created on the stereo-picture that opposite side scans with the scan-data of a side, can make the relative height generation distortion of object in the image.But this does not influence the position relation of object; Below will explain, and not hinder us only to carry out one-sided scanning and realize the bilateral three-dimensional imaging.

Through the one-sided scanning shown in Fig. 3-A, by two width of cloth 2D views that the right and left eyes detector is obtained, " the front perspective view picture " of generation will be shown in Fig. 3-D, and this is the stereo-picture of seeing to ray the place ahead from the actual emanations source.Can know that by Fig. 3-B the casing upper edge projection meeting of exiting side is lower and black than the casing upper edge projection of light incident side.Represent the casing arris projection of ray light incident side among Fig. 3-D with the fine rule square frame, the thick line square frame is represented the casing arris projection of ray exiting side.Seem that as if the casing arris of exiting side given prominence in case before the object.As if the dark-colored image of thick close object also gave prominence to before the light-colored image of frivolous object; Stereoscopic vision is interfered.This also is that one of reason that obtains widespread usage is failed in radiolucent so far 3D imaging.If visual light imaging, the front and back object has hiding relation, and stereoscopic visual effect can be more much better than the 3D rendering of ray, like Fig. 3-C.

Bilateral stereoscopic imaging method of the present invention can improve the visual effect of transmission three-dimensional imaging.The principle that generates the bilateral stereo-picture with the three-dimensional imaging data of one-sided scanning as Fig. 4Shown in, Fig. 4 top is a front elevation, the below is a vertical view.

All types of 3D displays all have a basic function: the image of left and right sides detector can only be seen by eyes respectively.For example the object image 11 of left detector only gets into observer's left eye 14 among Fig. 4-A, and the object image 12 in the right detector image only gets into right eye 15; Object 13 in the 3D vision will be positioned at before the 3D display 9 apparent planes.Actual object is far away more from detector, and image 11 in left and right detector image and 12 distances are big more, and its 3D image also is projected at the moment more.If (Fig. 4-B), the position of object 13 in 3d space will be after the apparent plane of 3D display 9, and caing be compared to is the mirror image of object image 13 among Fig. 4-A with the image exchange of left and right detector.Mirror transformation has reversed the context of object in the 3D rendering.

If in Fig. 3, left and right sides detector image is exchanged, the 3D rendering of generation will be like Fig. 3-E.It is the mirror image of Fig. 3-D that Fig. 3-E cans be compared to, and is equivalent to look sideways from the ray outgoing stereo-picture of object to be detected.A side that has been become nearest eye by examination box arris (thick line square frame) of ray exiting side among Fig. 3-E, it blocks all objects is natures, does not disturb stereoscopic vision.The ray light incident side can not blocked the object in any casing to be detected, so the stereoscopic sensation of Fig. 3-E is better than Fig. 3-D farthest by examination box arris (fine rule square frame) maximum in Fig. 3-E; But the position, the left and right sides of object and casing relation and position opposite in kind among Fig. 3-E.The image of left and right sides detector is carried out flip horizontal regeneration three-dimensional view earlier, get Fig. 3-F, the position, the left and right sides of object and casing just can be consistent with position in kind.The same with Fig. 3-E, the stereoscopic visual effect of Fig. 3-F is also relatively good.Definition Fig. 3-F is " a virtual rear perspective image ", is called for short " rear perspective image ".

Why Fig. 3-F is called virtual rear view picture, because it is not really to utilize radiation source to carry out the rear view picture that transmission scan obtains at the back from object to be detected.The object height ratio of different depths is not really to utilize the object height ratio of radiation source when object to be detected carries out transmission scan at the back among Fig. 3-F.But its object height ratio is with the conventional 2D view that uses is the same at present, instead the benefit of being convenient to mate identification is arranged; The basic view that conventional 2D view always need show in testing.

Except that the interference problem of last routine object to be detected arris stereo vision, when thick close object and frivolous overlapped object, thick close object seems also can compare " before robbing ", is not easy to distinguish the relative position of equitant frivolous object with it.Adopt bilateral stereoscopic imaging method of the present invention, a side image is always arranged, and (Fig. 3-D or Fig. 3-F) are that this thick close object is forward really, and from then on the side image is seen just than the relative position that is easier to see clearly overlapping object.

The product process of image is summarized in Fig. 5,Bilateral three-dimensional imaging of the present invention through once fast scanning will demonstrate three kinds of images: basic (left eye or right eye) 2D image, forward sight 3D rendering and backsight 3D rendering, on computer screen 9, unite and show ( Fig. 6), controlled observation helps recognition object and locus thereof.

3D display of the present invention can adopt the 3D display of existing any kind.When adopting complementary color formula (Anaglyph) 3D to show, need the complementary color 3D rendering and form device, but this belongs to the general pattern treatment technology.Complementary color formula 3D rendering uses dark purple (red green) glasses just can watch, and does not have flickering, need not connect signal and power supply, and is easy to use, can be used as testing staff's first-selection.

Dynamic 3D of the present invention shows that purpose is further to improve the visual effect of 3D radiant image.When seeing static 3D radiation image, the suitable move left and right head of observer can help recognition object far and near, but very limited.Adopt the dynamic 3D display packing of various visual angles of the present invention, more help recognition object depth position.As shown in Figure 1, the N row detector has N-1 to the visual angle pictures different, and the subtense angle of every pair of image all equals basic subtense angle q; The 3D rendering that is generated by every pair of image has the basic depth of field.N-1 is shown visual angle pictures different circulation, just can see the individual dynamic 3D rendering with basic depth of field of N-1 rotary oscillation as Fig. 7For ease of diagram, the image of three different visual angles among the figure has deliberately drawn back distance; Their turning axle should be overlapping).The 3D rendering that eye-observation rotates can be more responsive to the relative position of object.

The N row detector has N-2 right to the image with 2 times of basic subtense angles, has N-3 right to the image with 3 times of basic subtense angles, and its depth of field is 2 times or 3 times of the basic depth of field when being shown as 3D rendering, circulation show the dynamic 3D rendering that just can see depth of field variation as Fig. 8

Fig. 9In 16 are the 3 d display devices that adopt the eyes liquid crystal display, can be simple switching regulator liquid crystal glasses or high-quality virtual implementing helmet.Directly, can see the forward sight 3D rendering with the image input eyes liquid crystal display of left and right sides detector; The image of left and right sides detector is carried out importing the eyes liquid crystal display again behind the flip horizontal, and what see is the backsight 3D rendering.

Figure 10In 17 are the 3D displays that adopt the bore hole display screen.Need not wear anaglyph spectacles and virtual implementing helmet and just can see the volume rendering image of different visual angles.Principal computer 8 is alternately reset the image of each FEP by row, imports high resolution display then.For example, adopt the system of tri-array detector, single pass obtains the image of three different visual angles.Alternately reset by row through principal computer, make the 1st, 4,7 of display ... Row show left detector array image, the 2nd, 5,8 ... Detector array image during row show, the 3rd, 6,9 ... Row show right detector array image.The bore hole 3D display screen 20 that the refraction angle changes by row is equipped with in display the place ahead, and the observer is in the diverse location before the display screen, can bore hole sees the stereo-picture of different visual angles.

Claims (3)

1. the method and the device of the one-sided scanning bilateral of an object three-dimensional imaging; This device comprises radiation source, stitch ray collimator, line up signal processing circuit and front-end computer, principal computer and software, the 3D display of many arrays radiation detector, many arrays radiation detector of certain subtense angle more; It is characterized in that described radiation source and many seam ray collimators place a side of object to be detected; Many arrays radiation detector places the opposite side of object to be detected, is connected with signal processing circuit and front-end computer, principal computer and software, 3D display, and each detector array is at regular intervals each other, with different visual angles towards radiation source.

2. the method and the device of the one-sided scanning bilateral of a kind of object as claimed in claim 1 three-dimensional imaging, the characteristic of the method step of its one-sided scanning bilateral three-dimensional imaging is:

⑴ radiation source carries out single pass in object to be detected one side, and as left-eye image, the image of right detector demonstrates the forward sight 3D rendering as eye image with the left detector image of arbitrary array detector;

⑵ carry out behind the flip horizontal the left detector image of arbitrary array detector as left-eye image, and the image of right detector carries out behind the flip horizontal demonstrating the backsight 3D rendering as eye image;

Constitute the bilateral stereo-picture by forward sight 3D rendering and backsight 3D rendering.

3. the method and the device of the one-sided scanning bilateral of a kind of object as claimed in claim 1 three-dimensional imaging, its characteristic that realizes the method that stereo-picture dynamically shows is:

⑴ show different visual angles through circulation but have the stereo-picture of the paired detector array of same view angle difference that the dynamic 3D that carries out the object rotary oscillation shows;

⑵ carry out the dynamic 3D demonstration that the object depth of field changes through the stereo-picture of the paired detector array of circulation demonstration different visual angles difference.

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