CN102905040B - For the imaging system of documentary evidence imaging - Google Patents
For the imaging system of documentary evidence imaging Download PDFInfo
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- CN102905040B CN102905040B CN201110211995.2A CN201110211995A CN102905040B CN 102905040 B CN102905040 B CN 102905040B CN 201110211995 A CN201110211995 A CN 201110211995A CN 102905040 B CN102905040 B CN 102905040B
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Abstract
The invention discloses a kind of imaging system for documentary evidence imaging, comprise imaging device, for giving described documentary evidence imaging; Transparent panel, described documentary evidence is placed on described transparent panel; Lighting source, it emits beam and is irradiated on documentary evidence by described transparent panel; Principal reflection mirror, the light reflected from documentary evidence by described primary mirror reflects to imaging device; Wherein, described transparent panel and described principal reflection mirror are arranged in vertical direction, and described imaging system and described lighting source are separately positioned on the both sides of described transparent panel and described principal reflection mirror in the horizontal direction.By imaging system and lighting source are split both sides, imaging system of the present invention can reliably and easily be eliminated by lighting source by reflective and bright spot phenomenon that is that cause.
Description
Technical field
The present invention relates to a kind of imaging system for documentary evidence imaging.
Background technology
As a kind of special imaging system, the imaging system for documentary evidence imaging is widely used in identity card, passport etc., and other need the imaging of the file of clear identification.In this imaging system, be generally placed on transparent panel by documentary evidence, the light that then lighting source sends usually reflects through transparent panel through one or many and is irradiated to documentary evidence.The light reflected from documentary evidence is imaged device reception, and the information obtained can be stored, or is processed and checks its authenticity etc.
As shown in Figure 1, the imaging system for documentary evidence imaging in a kind of prior art is shown, its grant number is US7046346.Wherein Reference numeral 10 is file to be imaged, and 20,25 are respectively lower speculum and upper reflector, and 35 is the LED group being used as lighting source, and 40 is imageing sensor.In 346 ', documentary evidence is irradiated by LED group 35; Then the light reflected from documentary evidence first reflexes to lower speculum 20 downwards as shown in lines Fig. 1, then being reflexed to upper reflector 25 by lower speculum 20 to upper right, finally again being reflexed to imageing sensor 40 (successively passing through for collecting with the lens 30 of focused ray and for eliminating undesired ultraviolet filter 32 before entering imageing sensor 40) downwards by upper reflector 25.
Unshowned 346 ', be the transparent panel that the such as glass that usually will use in practice is made.The upper surface supposition of transparent panel is fitted completely with the surface to be imaged of documentary evidence, is therefore the image planes of whole imaging system.
Surface to be imaged due to documentary evidence has higher reflectivity, and (usual reflectivity is more than 60%, but can not the smooth mirror-reflection to being formed in complete meaning, therefore the reflectivity on reflection direction can be such as 20%), therefore in fact documentary evidence surface itself adds the slightly weak speculum of reflective (reflectivity of about 15%) formation of upper glass plates.
Due to the existence of this slightly weak speculum, present inventor notices as a kind of defect being called bright spot of 346 ' easy generation.That is, lighting source 35 is by slightly weak speculum reflection imaging, enters into imageing sensor 40.Because lighting source has higher brightness, therefore, lighting source 35, by slightly weak speculum reflection imaging, forms " bright spot " for the imaging of documentary evidence.
Concrete bright spot Producing reason, will illustrate with reference to another prior art below.With regard to the layout of 346 ', briefly, assuming that remove upper and lower speculum 20,25, imaging device 30,32,40 will be positioned at the theoretical position place (being launched by downward for the zigzag light path of Fig. 1 straight line and arrive this theoretical position) of certain distance immediately below file 10.The visual field of imaging device 30,32,40 then can be limited by the line of the center of lens 30 to the edge of documentary evidence.
Like this, when documentary evidence surface and transparent panel form slightly weak speculum, lighting source 35 in above-mentioned theory position can be rendered as mirror image square on a glass because of the reflection of this slightly weak speculum.This mirror image is positioned at the determined field range of described line, this means that LED group that a brightness is about 35% (20%+15%) of lighting source 35 emits beam at this mirror image place and enters into imaging device, and cause undesired bright spot.
Below, specific explanations bright spot Producing reason is carried out by carrying out analysis to the existing imaging system for documentary evidence imaging of the another kind shown in Fig. 2.
In this imaging system, by the documentary evidence be imaged as passport is placed on the transparent panel 51 that glass makes downwards, principal reflection mirror 52 is arranged on below transparent panel 51.Imaging device 53 and lighting source 54 are positioned at the same side, that is, the left side in Fig. 2.Principal reflection mirror 52 tilts towards left side, is 40-50 degree with the angle from horizontal direction.
When this imaging system of practical application carries out imaging to documentary evidence, present inventor finds that this imaging system also easily produces bright spot problem.Especially, when when documentary evidence, and non-fully is fitted, transparent panel is placed, even if when documentary evidence and transparent panel exist a little angle in other words, be easy to occur bright spot in imaging.
So after the position occurred through the bright spot under carefully studying various situation, inventor provides following diagram so that above-mentioned bright spot Producing reason to be described.
As shown in Figure 3, the field range that boundary line 55,56 defines imaging device 53 (determines that the method for field range is: suppose not use principal reflection mirror, then imaging device 53 should in the position symmetrical relative to principal reflection mirror 52 and current location, and the line on the border of this symmetric position and transparent panel 51 is boundary line 55,56).In figure 3, the picture of the lighting device that can expect has mirror image 54-1, and it is that lighting source 54 is by principal reflection mirror 52 imaging; 54-2, its slightly weak mirror imager being proved to be paper surface and glass plate formation for mirror image 54-1 is mirror image 54-2; And mirror image 54-3 (54-2 is by principal reflection mirror 2 imaging) and 54-4 (54-3 is by slightly weak mirror imager).Although this imaging can proceed down, but as we can see from the figure, continue reflection imaging incite somebody to action more weak and to upper right side away from visual field, therefore, be worth us it is of concern that fallen into the mirror image 54-2 in the determined field range in boundary line 55,56.
As shown in Figure 4, for removing 54-2, the lighting angle of lighting source 54 can be limited.By the lighting source in Fig. 4 compared with the lighting source in Fig. 3, can find out that the lower limit angle of the light emitting region of in Fig. 4 54 becomes b ' from b.So directly avoid lighting source 54 by principal reflection mirror 52 imaging, namely can not produce the mirror image 54-1 shown in Fig. 3 again, also naturally there will be no mirror image 54-2.
Although can eliminate mirror image 54-2 like this, applicant finds still may produce bright spot along another light path.Specifically, because documentary evidence surface and glass plate are equivalent to slightly weak speculum, therefore, lighting source 54 can this slightly weak mirror imager be 54-5, then this mirror image 54-5 is imaged as 54-6 by principal reflection mirror 52, then mirror image 54-6 once more this slightly weak mirror imager be 54-7.Although this imaging can proceed down, as below, above-mentioned image 54-5,54-7 cause the main cause of bright spot (if being eliminated the words of mirror image 54-2 by the light emitting region of restriction lighting source 54).
Specifically, mirror image 54-5 is positioned at outside boundary line 55, this means that the slight variations of angle of transparent panel 51 surface of documentary evidence (and therefore) or a little change of the position of lighting source or imaging device just may make mirror image 54-5 enter in boundary line 55, and cause bright spot in the imaging of documentary evidence.Similarly, mirror image 54-7, outside boundary line 56, may cause bright spot phenomenon because of a little change of whole system equally.
Continue with reference to figure 4, when the specular reflectivity of this slightly weak speculum (namely considering the reflection of documentary evidence and the reflex time of transparent panel) is 35%, then the brightness of mirror image 54-5 is 35% of lighting source 54, therefore once mirror image 54-5 enters the visual field of imaging device 53, obviously bright spot will be become.The brightness of mirror image 54-7 is then weaker, and its brightness is:
Lighting source 54 brightness of this slightly weak this slightly weak mirror mirror reflectivity (35%) ≈ 10% of mirror mirror reflectivity (35%) * primary mirror reflects rate (≈ 1) * of the brightness * of lighting source 54
Therefore, when mirror image 54-7 enters the visual field of imaging device 53, it also can form bright spot, but brightness will lower than only by bright spot 54-5 that primary event is formed.
As previously mentioned, principal reflection mirror 52 be 40-50 degree from the angle of horizontal direction.First design is the theoretical position of imaging device 53 is set in suitable object distance place immediately below transparent panel (namely, imaging device 53 ' is just taken documentary evidence in certain distance, thus obtain optimal imaging effect), position and the angle of inclination of principal reflection mirror 52 is then selected according to the required position that arranges of the imaging device 53 of reality.Therefore, say from design, the visual field of imaging device 53 is reserved in advance, and selects the visual field not changing imaging device when the angle of principal reflection mirror 52 and position.
But the angle of principal reflection mirror 52 can affect the position of mirror image 54-7.Principal reflection mirror 52 is the closer to vertical direction in principle, then the position of mirror image 54-6 makes the position of mirror image 54-7 more on the right side also on the right side.But the position of mirror image 54-5 is only relevant with transparent panel 51 with light source 54, and have nothing to do with the angle of principal reflection mirror 52.Therefore 54-5, still enters visual field for potential speck.And along with principal reflection mirror 52 vertical direction rotates, equipment volume increases fast.Be unfavorable for device miniaturization.
Therefore, by allow principal reflection mirror 52 be 40-50 degree from the angle of horizontal direction, the imaging system design of the prior art is for when normally using, there will not be the bright spot 54-1 directly once formed by principal reflection mirror 52, and the bright spot 54-5 that the primary event of slightly weak speculum is formed described in documentary evidence surface and transparent panel are formed and the bright spot 54-7 that secondary reflection (the middle primary event also comprising principal reflection mirror) is formed is also just beyond the visual field of imaging device.
Like this, when documentary evidence is closely fitted on transparent panel 51, the prior art can avoid bright spot phenomenon.
But actual in using imaging system to carry out imaging to documentary evidence, documentary evidence often tilts relative to transparent panel 51.As shown in Figure 5 and Figure 6, documentary evidence 57 may be inclined upwardly in left side and right side respectively relative to transparent panel 51.
When documentary evidence 57 is inclined upwardly in left side, the surface of documentary evidence is equivalent to by the weak speculum slightly raised from transparent panel 51.Now, although lighting source 54 formed by transparent panel 51 primary event picture still beyond boundary line 55 (i.e. the left side of 55); But lighting source 54 is proved to be picture 54-8 that the surperficial primary event of file formed may on the right side of boundary line 55, that is, formation bright spot in the visual field entering into imaging device.And when documentary evidence 57 is inclined upwardly on right side, then lighting source 54 is proved to be file-principal reflection mirror-documentary evidence and reflects the left side that imaging 54-9 then easily falls boundary line 56 successively, enters in the visual field of imaging device.
Therefore, when documentary evidence is not exclusively fitted on transparent panel 51, due to the reflection on documentary evidence surface, easily produce bright spot in respective side.
Even if it is envisioned that carry out anti-reflection process to transparent panel 51, the reflection on the surface of documentary evidence still can cause bright spot problem.The mode solved the problem of prior art is the both sides additional compaction device at documentary evidence, to limit documentary evidence 57 relative to transparent panel 51 lopsidedness in office.But above-mentioned hold down gag also makes whole device become more complicated, and make the operation of system more loaded down with trivial details.
Summary of the invention
Given this, the present invention aims to provide a kind of imaging system for documentary evidence imaging, and it is eliminated or at least alleviates bright spot problem.
According to the imaging system for documentary evidence imaging of the present invention, comprise imaging device, for giving described documentary evidence imaging; Transparent panel, described documentary evidence is placed on described transparent panel; Lighting source, it emits beam and is irradiated on documentary evidence by described transparent panel; Principal reflection mirror, the light reflected from documentary evidence by described primary mirror reflects to imaging device; Wherein, described transparent panel and described principal reflection mirror are arranged in vertical direction, and described imaging system and described lighting source are separately positioned on the both sides of described transparent panel and described principal reflection mirror in the horizontal direction.
By lighting source is arranged on the side relative with imaging device, due to reflective and produce bright spot phenomenon be easy to eliminate.That is, imaging device of the present invention and lighting source split the layout of both sides, can reliably and easily eliminate or at least alleviate bright spot phenomenon.
Accompanying drawing explanation
Fig. 1 is as the imaging system for documentary evidence imaging in one section of United States Patent (USP) of prior art.
Fig. 2 is the another kind of existing imaging system for documentary evidence imaging.
Fig. 3-6 illustrates the reason producing bright spot in imaging system in fig. 2, and wherein Fig. 5,6 distinguishes corresponding documentary evidence relative to transparent panel in the acclivitous situation in the left side of Fig. 2 and right side.
Fig. 7 is according to the preferred embodiment of the invention for the imaging system of documentary evidence imaging, and most probable shown in it causes the lighting source picture of bright spot phenomenon.
Fig. 8 illustrates in the imaging system shown in Fig. 7, some other lighting source picture that can produce.
Fig. 9,10 to illustrate in the imaging system shown in Fig. 7 documentary evidence relative to transparent panel when the left side of Fig. 2 and right side are inclined upwardly, the change in location of lighting source picture.
Figure 11 illustrates according to another embodiment of the present invention for the imaging system of documentary evidence imaging, and wherein the position of the position of principal reflection mirror and angle, imaging device and angle are all different from the embodiment shown in Fig. 7.
Figure 12 illustrates the imaging system for documentary evidence imaging according to further embodiment of this invention, itself and difference embodiment illustrated in fig. 7 are, illumination reflector is provided with on the right side of Figure 12, corresponding movement is done in the position of lighting source, and lighting source is irradiated on documentary evidence after illumination reflector reflection.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein identical from start to finish label represents same or analogous element.Below with reference to the accompanying drawings the embodiment described is exemplary, is intended to explain the present invention, and can not be interpreted as one restriction of the present invention.
With reference to figure 7, the imaging system according to the preferred embodiment of the invention for documentary evidence imaging comprises: imaging device 83, for giving the imaging of described documentary evidence 87 (shown in Fig. 9,10); Transparent panel 81, described documentary evidence 87 is placed on described transparent panel 81; Lighting source 84, it emits beam and is irradiated on documentary evidence 87 by described transparent panel 81; Principal reflection mirror 82, the light reflected from documentary evidence 87 is reflexed to imaging device 83 by described principal reflection mirror 8; Wherein, described transparent panel 81 is arranged in vertical direction with described principal reflection mirror 82, and described imaging system 83 and described lighting source 84 are separately positioned on the both sides of described transparent panel and described principal reflection mirror in the horizontal direction.
Surface and the described principal reflection mirror 82 of described transparent panel 81, described documentary evidence 87 form mirror image optimal system, described lighting source 84 position be arranged so that described lighting source by described mirror image optimal system become picture outside the visual field of described imaging device.
Specifically, with reference to figure 7, lighting source 87 the slightly weak mirror imager that forms by the surface of that side of the laminating transparent panel of transparent panel 81 and documentary evidence 87 be 84-12.Outside the field range that this mirror image 84-12 limits in boundary line 85,86.With aforesaid, the defining method of boundary line 85,86 determines that the method for the boundary line in Fig. 3 55,56 is identical, repeat no more herein.
With reference to figure 8, illustrate that lighting source is by the situation of multiple reflections.Mirror image 84-12 is imaged as 84-13 by principal reflection mirror 82, then mirror image 84-13 again the slightly weak mirror imager that forms by the surface of transparent panel 81 and documentary evidence be 84-14.Continue this imaging analysis, can see that the picture of lighting source is distributed in the farther place, right side of mirror image 84-12.Therefore, using the surface of described transparent panel, described documentary evidence and described principal reflection mirror as mirror image optimal system, then lighting source 84 by this mirror image optimal system imaging all outside the visual field of imaging device 83.
Preferably, described transparent panel 81 is horizontal positioned, when the surface of described documentary evidence 87 and described transparent panel 81 are fitted completely, described lighting source 84 is by the visual field of the picture of the surface of described documentary evidence 87 and described transparent panel 81 primary event away from described imaging device 83.Such as described mirror image 84-12 is greater than 1 centimetre from the vertical range of boundary line 86, is preferably greater than 3 centimetres.
As shown in Figure 7, principal reflection mirror tilt towards imaging device side, preferably, principal reflection mirror with from the angle of horizontal direction be 20-70 degree, more preferably, principal reflection mirror with from the angle of horizontal direction be 30-60 degree.Like this, imaging device 83 position is in vertical direction moderate.
With reference to figure 9, illumination file 87 is shown relative to transparent panel 81 when imaging device side (left side of Fig. 9) is inclined upwardly, on the impact that the picture of the lighting source 84 that may cause bright spot phenomenon produces.
When shown in Fig. 9, due to the inclination of documentary evidence 87, its surface exists as a weak speculum separately.Now, the position of 84-12 from Fig. 7 is moved by surface reflection imaging that lighting source 84 is proved to be file 87 to the right, is imaged as 84-15.Therefore, being inclined upwardly in left side relative to transparent panel 81 of documentary evidence 87 can not cause bright spot phenomenon.
Otherwise, Figure 10 illustrate documentary evidence 87 relative to transparent panel 81 when right side is inclined upwardly, the change of the picture of lighting source 84.Now, because the surface of documentary evidence 87 exists as a weak speculum separately, the position of 84-12 from Fig. 7 is moved by surface reflection imaging that lighting source 84 is proved to be file 87 to the left, arrives the 84-16 position of such as close border line 86.
Therefore, documentary evidence 87 should be restricted in lighting source side acclivitous degree (angle) relative to transparent panel 81.Preferably, imaging device of the present invention also comprises angle restraint device, it limits between documentary evidence 87 and transparent panel 81 and is no more than predetermined value at the angle of lighting source 84 side, between documentary evidence 87 and transparent panel 81 when the angle of lighting source side is described predetermined value, described lighting source 84 formed by the surface of described documentary evidence 87 mirror image outside the border of the visual field of described imaging device 83.
With reference to Figure 11, the imaging system of another embodiment according to concept of the present invention is shown, its imaging device 83 and lighting source 84 are positioned at the both sides of transparent panel 81 and principal reflection mirror 82 equally.But the position of the principal reflection mirror 82 of the imaging system of Figure 11 and angle, and the position of imaging device 83 and angle are all different from the layout in Fig. 7.In fig. 11, mirror image 84-17 is that lighting source 84 is reflected imaging by the surface (when it fits transparent panel) of transparent panel 81 and documentary evidence; Mirror image 84-18 is that mirror image 84-17 is reflected imaging by principal reflection mirror 82; Mirror image 84-19 is that mirror image 84-18 is reflected imaging by the surface (when it fits transparent panel) of transparent panel 81 and documentary evidence again.Obviously, after employing both sides split layout, the mirror image of bright spot phenomenon may be caused all in side, upper right side, compared with the situation of mirror image 54-5, the 54-7 shown in prior art Fig. 4 respectively in both sides, boundary line, more easily control the position as lighting source 84 and ensure mirror image 84-17 and other mirror images visual field away from imaging device 83.
With reference to Figure 12, the another preferred embodiment of imaging system of the present invention is shown, is wherein provided with illumination reflector in the side relative with imaging device, the light that lighting source 84 sends is reflexed to described transparent panel 81 by described illumination reflector 89.
Compared by Figure 12 and Fig. 7, that can find out illumination reflector 89 adds transverse direction (left and right directions in Figure 12) length that can reduce whole system, is conducive to the miniaturization of system.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can change these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (6)
1., for an imaging system for documentary evidence imaging, comprising:
Imaging device, for giving described documentary evidence imaging;
Transparent panel, described documentary evidence is placed on described transparent panel;
Lighting source, it emits beam and is irradiated on documentary evidence by described transparent panel;
Principal reflection mirror, the light reflected from documentary evidence by described primary mirror reflects to imaging device; Wherein, described transparent panel and described principal reflection mirror are arranged in vertical direction, and described imaging system and described lighting source are separately positioned on the both sides of described transparent panel and described principal reflection mirror in the horizontal direction; And
Angle restraint device, it limits between documentary evidence and transparent panel and is no more than predetermined value at the angle of lighting source side, between documentary evidence and transparent panel when the angle of lighting source side is described predetermined value, described lighting source formed by the surface of described documentary evidence mirror image outside the border of the visual field of described imaging device.
2. imaging system according to claim 1, wherein:
The surface of described transparent panel, described documentary evidence and described principal reflection mirror form mirror image optimal system, described lighting source position be arranged so that described lighting source by described mirror image optimal system becomes as outside the visual field of described imaging device.
3. imaging system according to claim 2, wherein:
Described transparent panel is horizontal positioned, when the surface of described documentary evidence and described transparent panel are fitted completely, described lighting source is by the visual field border at least 1 centimetre of the image distance of the surface of described documentary evidence and described transparent panel primary event from described imaging device.
4. imaging system according to claim 3, wherein:
Principal reflection mirror tilts towards imaging device side, is 20-70 degree with the angle from horizontal direction.
5. imaging system according to claim 2, also comprises:
Illumination reflector, the light that described lighting source sends is reflexed to described transparent panel by described illumination reflector.
6. imaging system according to claim 1, wherein:
Described transparent panel is horizontal positioned, when the surface of described documentary evidence and described transparent panel are fitted completely, described lighting source is by the visual field border at least 1 centimetre of the image distance of the surface of described documentary evidence and described transparent panel primary event from described imaging device;
Principal reflection mirror tilts towards imaging device side, is 20-70 degree with the angle from horizontal direction;
Also comprise illumination reflector, the light that described lighting source sends is reflexed to described transparent panel by described illumination reflector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110211995.2A CN102905040B (en) | 2011-07-27 | 2011-07-27 | For the imaging system of documentary evidence imaging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110211995.2A CN102905040B (en) | 2011-07-27 | 2011-07-27 | For the imaging system of documentary evidence imaging |
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| CN102905040A CN102905040A (en) | 2013-01-30 |
| CN102905040B true CN102905040B (en) | 2016-04-20 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1131775A2 (en) * | 1998-11-12 | 2001-09-12 | Secugen Corporation | High contrast, low distortion optical acquisition system for image capturing |
| EP1154417A2 (en) * | 2000-05-12 | 2001-11-14 | Konica Corporation | Optical pick-up apparatus |
| CN101472037A (en) * | 2007-12-25 | 2009-07-01 | 东友科技股份有限公司 | Scanning module and light source projection device thereof |
| CN201585031U (en) * | 2009-10-30 | 2010-09-15 | 王心路 | Novel touch type image sensor |
-
2011
- 2011-07-27 CN CN201110211995.2A patent/CN102905040B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1131775A2 (en) * | 1998-11-12 | 2001-09-12 | Secugen Corporation | High contrast, low distortion optical acquisition system for image capturing |
| EP1154417A2 (en) * | 2000-05-12 | 2001-11-14 | Konica Corporation | Optical pick-up apparatus |
| CN101472037A (en) * | 2007-12-25 | 2009-07-01 | 东友科技股份有限公司 | Scanning module and light source projection device thereof |
| CN201585031U (en) * | 2009-10-30 | 2010-09-15 | 王心路 | Novel touch type image sensor |
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| CN102905040A (en) | 2013-01-30 |
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