CN105167735A - Method for eliminating ghost image in endoscope system - Google Patents
Method for eliminating ghost image in endoscope system Download PDFInfo
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- CN105167735A CN105167735A CN201510642008.2A CN201510642008A CN105167735A CN 105167735 A CN105167735 A CN 105167735A CN 201510642008 A CN201510642008 A CN 201510642008A CN 105167735 A CN105167735 A CN 105167735A
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- protecting window
- endoscope
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Abstract
The invention relates to a method for eliminating a ghost image in an endoscope system and belongs to the technical field of minimally invasive medical treatment. The method comprises the step of changing the structure or position of a protective window piece, so that a surface reflection imaging position is not on an image sensor or beyond the effective pixel range of the image sensor even though on the image sensor. The method has the advantages that the purpose of eliminating the ghost image in the endoscope system can be achieved only by changing the shapes or positions of an endoscope protective window and a camera system protective window, the existing structure of the whole endoscope system is not affected, the performance of the endoscope system can be improved, the surgical risk is lowered, and the method is particularly suitable for being applied in an existing endoscope system to improve the imaging performance of the endoscope; in addition, the method for eliminating the ghost image in the endoscope system, particularly the ghost image in an optical system with a protective window can be applied to other similar optical systems to eliminate ghost images in the optical systems.
Description
Technical field
The present invention relates to a kind of method eliminating ghost image in endoscopic system, belong to the technical field of minimally invasive medical.
Background technology
Rigid endoscope system comprises endoscope, camera system and display.Endoscope needs the cleaning, sterilizing and the disinfecting process that experience repeatedly in clinical practice.Due to the needs of sterilizing, it need seal with former and later two protecting windows by endoscope's whole optical system completely, and camera system comprises imaging group, imageing sensor and at least one protecting window.Current, the front and back protecting window of endoscope and the protecting window of camera system are all plane.Because the outgoing beam of endoscope is directional light, the surface reflection after endoscope on protecting window and camera system protecting window can form secondary or multiply-reflected image on the image sensor, namely forms ghost image.The brightness ratio normal picture of ghost image is much lower; generally do not affect use; if but have the very strong apparatus of surface reflection to enter the field range of endoscope; stronger ghost image can be formed; affect observation and the operation of doctor; therefore, the ghost image eliminated due to the formation of protecting window surface reflection is also necessary.
Summary of the invention
Technical problem to be solved by this invention is the ghost image that the surface reflection eliminating endoscope and camera system protecting window is formed; the method adopted is the structure or the position that change protecting window sheet; although the image space making surface reflection not on the image sensor or image space on the image sensor, outside the valid pixel scope of imageing sensor.
Now be described with reference to the accompanying drawings technical scheme of the present invention:
A kind of method eliminating ghost image in endoscopic system, described method is implemented in endoscopic system, endoscopic system is containing protecting window (11) after endoscope, imaging lens group ((12)), camera system protecting window ((13)), imageing sensor (14), after endoscope, the outer surface of protecting window (11) is the exit facet of endoscope, the quasi-parallel light of outgoing, imaging lens group (12) by quasi-parallel smooth focal imaging on imageing sensor (14), camera system protecting window (13) can be positioned at after endoscope between protecting window (11) and imaging lens group (12) according to the formation difference of camera system, also can be positioned between imaging lens group (12) and imageing sensor (14), or the two has, it is characterized in that, the image space of the surface reflection after the method one Shi Shi endoscope of elimination ghost image between protecting window (11) and camera system protecting window (13) is not on the image sensor, concrete mode is that protecting window after endoscope (11) or camera system protecting window (13) adopt curved surface protecting window, or protecting window (11) and camera system protecting window (13) all adopt curved surface protecting window after endoscope, eliminate protecting window (11) and camera system protecting window (13) after the method two Shi Shi endoscope of ghost image although between surface reflection image space on the image sensor, but outside the available field of view's scope being imaged on imageing sensor, concrete mode is the angle θ that tilted by the plane protecting window of the plane protecting window of protecting window after endoscope (11) or camera system protecting window (13)
1, or an angle θ that the plane protecting window of protecting window after endoscope (11) and camera system protecting window (13) is tilted respectively
2and θ
3if imageing sensor valid pixel catercorner length is L, imaging lens group focal length is f, eliminates ghost image then θ
1the condition that need meet is: θ
1>arctan (L/2f), (θ
2+ θ
3) condition that need meet is: θ
2+ θ
3>arctan (L/2f).
Further technical characteristic of the present invention is; described method employing method one and the combination of method two; namely endoscope's protecting window (11) and camera system protecting window (13) adopt curved surface protecting window and angle of inclination protecting window respectively, otherwise or endoscope's protecting window (11) and camera system protecting window (13) adopt angle of inclination protecting window and curved surface protecting window respectively.
Further technical characteristic of the present invention is, after the endoscope described in method one, protecting window (11) is meniscus lens, and camera system protecting window (13) is meniscus lens.
Further technical characteristic of the present invention is, after the endoscope described in method two, protecting window (11) and camera system protecting window (13) are all angle of inclination plane protecting windows, and angle of inclination is consistent, i.e. θ
2=θ
3.
The invention has the advantages that; the shape or the position that only change endoscope's protecting window and camera system protecting window just can reach the object eliminating endoscopic system ghost image; do not affect the existing structure of whole endoscopic system, the performance of endoscopic system can be promoted, reduce operation risk.
Accompanying drawing explanation
Fig. 1: optical texture schematic diagram 1 of the present invention.
Fig. 2: optical texture schematic diagram 2 of the present invention.
Fig. 3: optical texture schematic diagram 3 of the present invention.
Detailed description of the invention
Now describe technical scheme of the present invention and operation principle in conjunction with the accompanying drawings and embodiments in detail.
All embodiments all have and structure identical described in summary of the invention, and for avoiding repetition, following examples only enumerate crucial technical data.
Embodiment 1: after endoscope, protecting window (11) is bent moon sphere protecting window; the radius of curvature in two faces is all 50mm; camera system protecting window (13) is positioned between image-forming assembly (12) and imageing sensor (14); plane protecting window, and perpendicular to optical axis.
Operation principle: by the quasi-parallel light beam of endoscope's outgoing, meet image-forming assembly (12) image-forming condition, light beam is imaged on imageing sensor (14) by image-forming assembly (12), when light beam I is through camera system protecting window (13), except most of light beam transmission, some beam reflection forms primary event light beam, primary event light beam is by after image-forming assembly (12), after image-forming assembly (12) outgoing, primary event light beam is as the criterion directional light, protecting window (11) after primary event light beam irradiation to endoscope, protecting window (11) after major part light transmission endoscope, fraction beam reflection forms secondary reflection light beam, due to protecting window after endoscope (11) for meniscus lens designs, surface radius is 50mm, secondary reflection light beam is utilizing emitted light, the focus that image-forming assembly (12) converges for quasi-parallel light and utilizing emitted light is not at same plane.
Embodiment 2: after endoscope, protecting window (11) is bent moon sphere protecting window; the radius of curvature in two faces is all 70mm; camera system protecting window (13) is positioned between image-forming assembly (12) and imageing sensor (14); be bent moon sphere protecting window, the radius of curvature in two faces is all 70mm.
Operation principle and embodiment 1 operation principle similar, repeat no more.
Embodiment 3: after endoscope, protecting window (11) is plane protecting window, and with optical axis included angle θ
1=8 °, camera system protecting window (13) is positioned between image-forming assembly (12) and imageing sensor (14), is plane protecting window, and with optical axis included angle θ
1=8 °, imageing sensor valid pixel catercorner length L is 5.6mm, and imaging lens group focal distance f is 20mm.
Operation principle: by the quasi-parallel light of endoscope's outgoing, meet image-forming assembly (12) image-forming condition, light beam is imaged on imageing sensor (14) by image-forming assembly (12), when light beam is through camera system protecting window (13), except most of light beam transmission, some beam reflection forms primary event light beam, primary event light beam is by after image-forming assembly (12), after image-forming assembly (12) outgoing, primary event light beam is as the criterion directional light, protecting window (11) after primary event light beam irradiation to endoscope, protecting window (11) after major part light transmission endoscope, fraction beam reflection forms secondary reflection light beam, because protecting window after endoscope (11) and the angle of optical axis are 8 °, according to formula θ
1>arctan (L/2f), after endoscope, protecting window angle of inclination meets elimination ghost image condition, and secondary reflection light beam is imaged on outside available field of view's scope of imageing sensor.
Embodiment 4: after endoscope, protecting window (11) adopts sphere protecting window; camera system protecting window (13) to be positioned at after endoscope between protecting window (11) and image-forming assembly (12); adopt plane protecting window, 5 °, angle of inclination.
Operation principle and above-described embodiment operation principle similar, repeat no more.
The method of ghost image in elimination endoscopic system of the present invention, is suitable for especially being applied in existing endoscopic system, improves the imaging performance of endoscope, reduce operation risk.The method, the particularly method of the ghost image of the optical system of cancellation band protecting window of elimination optical system ghost image of the present invention, also can be applicable in other similar optical systems simultaneously, eliminates the ghost image of optical system.
Claims (8)
1. eliminate the method for ghost image in endoscopic system for one kind, described method is implemented in endoscopic system, endoscopic system is containing protecting window (11) after endoscope, imaging lens group ((12)), camera system protecting window ((13)), imageing sensor (14), after endoscope, the outer surface of protecting window (11) is the exit facet of endoscope, the quasi-parallel light of outgoing, imaging lens group (12) by quasi-parallel smooth focal imaging on imageing sensor (14), camera system protecting window (13) can be positioned at after endoscope between protecting window (11) and imaging lens group (12) according to the formation difference of camera system, also can be positioned between imaging lens group (12) and imageing sensor (14), or the two has, it is characterized in that, the image space of the surface reflection after the method one Shi Shi endoscope of elimination ghost image between protecting window (11) and camera system protecting window (13) is not on the image sensor, concrete mode is that protecting window after endoscope (11) or camera system protecting window (13) adopt curved surface protecting window, or protecting window (11) and camera system protecting window (13) all adopt curved surface protecting window after endoscope, eliminate protecting window (11) and camera system protecting window (13) after the method two Shi Shi endoscope of ghost image although between surface reflection image space on the image sensor, but outside the available field of view's scope being imaged on imageing sensor, concrete mode is the angle that tilted by the plane protecting window of the plane protecting window of protecting window after endoscope (11) or camera system protecting window (13), or an angle that the plane protecting window of protecting window after endoscope (11) and camera system protecting window (13) is tilted respectively and, if imageing sensor valid pixel catercorner length is, imaging lens group focal length is, eliminating ghost image then needs the condition met to be: θ
1>arctan (L/2f), (θ
2+ θ
3) condition that need meet is: θ
2+ θ
3>arctan (L/2f).
2. a kind of method eliminating ghost image in endoscopic system according to claim 1; it is characterized in that; described method employing method one and the combination of method two; namely endoscope's protecting window (11) and camera system protecting window (13) adopt curved surface protecting window and angle of inclination protecting window respectively, otherwise or endoscope's protecting window (11) and camera system protecting window (13) adopt angle of inclination protecting window and curved surface protecting window respectively.
3. a kind of method eliminating ghost image in endoscopic system according to claim 1, is characterized in that, after the endoscope described in method one, protecting window (11) is meniscus lens, and camera system protecting window (13) is meniscus lens.
4. a kind of method eliminating ghost image in endoscopic system according to claim 1; it is characterized in that; after endoscope described in method two, protecting window (11) and camera system protecting window (13) are all angle of inclination plane protecting windows, and angle of inclination is consistent, i.e. θ
2=θ
3.
5. a kind of method eliminating ghost image in endoscopic system according to claim 1; after the endoscope of the endoscopic system described in method one, protecting window (11) is bent moon sphere protecting window; the radius of curvature in two faces is all 50mm; camera system protecting window (13) is positioned between image-forming assembly (12) and imageing sensor (14); plane protecting window, and perpendicular to optical axis.
6. according to claim 1; a kind of method eliminating ghost image in endoscopic system described in 3; after the endoscope of the endoscopic system described in method one, protecting window (11) is bent moon sphere protecting window; the radius of curvature in two faces is all 70mm; camera system protecting window (13) is positioned between image-forming assembly (12) and imageing sensor (14); be bent moon sphere protecting window, the radius of curvature in two faces is all 70mm.
7. a kind of method eliminating ghost image in endoscopic system according to claim Isosorbide-5-Nitrae, after the endoscope of the endoscopic system described in method two, protecting window (11) is plane protecting window, and with optical axis included angle θ
1=8 °, camera system protecting window (13) is positioned between image-forming assembly (12) and imageing sensor (14), is plane protecting window, and with optical axis included angle θ
1=8 °, imageing sensor valid pixel catercorner length L is 5.6mm, and imaging lens group focal length is 20mm.
8. according to claim 1; a kind of method eliminating ghost image in endoscopic system described in 2; after the endoscope of described endoscopic system, protecting window (11) adopts sphere protecting window; camera system protecting window (13) to be positioned at after endoscope between protecting window (11) and image-forming assembly (12); adopt plane protecting window, 5 °, angle of inclination.
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|---|---|---|---|
| CN201510642008.2A CN105167735B (en) | 2015-09-30 | 2015-09-30 | A kind of method of ghost image in elimination endoscopic system |
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|---|---|---|---|
| CN201510642008.2A CN105167735B (en) | 2015-09-30 | 2015-09-30 | A kind of method of ghost image in elimination endoscopic system |
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| CN105167735A true CN105167735A (en) | 2015-12-23 |
| CN105167735B CN105167735B (en) | 2017-08-22 |
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Cited By (3)
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| CN106510602A (en) * | 2016-12-14 | 2017-03-22 | 青岛奥美克医疗科技有限公司 | Novel endoscope field diaphragm device |
| CN111629199A (en) * | 2019-02-27 | 2020-09-04 | 杭州海康汽车技术有限公司 | Ghost image testing method and system |
| CN112617721A (en) * | 2020-12-31 | 2021-04-09 | 青岛海泰新光科技股份有限公司 | Endoscope, endoscope cold light source's connection feedback device |
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| CN112617721A (en) * | 2020-12-31 | 2021-04-09 | 青岛海泰新光科技股份有限公司 | Endoscope, endoscope cold light source's connection feedback device |
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|---|---|
| CN105167735B (en) | 2017-08-22 |
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