CN106377220B - Optical imaging method, system and capsule medical apparatus - Google Patents
Optical imaging method, system and capsule medical apparatus Download PDFInfo
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- CN106377220B CN106377220B CN201610892843.6A CN201610892843A CN106377220B CN 106377220 B CN106377220 B CN 106377220B CN 201610892843 A CN201610892843 A CN 201610892843A CN 106377220 B CN106377220 B CN 106377220B
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- 239000002775 capsule Substances 0.000 title claims abstract description 64
- 238000012634 optical imaging Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 239000000571 coke Substances 0.000 claims abstract description 19
- 238000003384 imaging method Methods 0.000 claims description 29
- 239000004973 liquid crystal related substance Substances 0.000 claims description 19
- 239000000178 monomer Substances 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 5
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 210000001035 gastrointestinal tract Anatomy 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000002627 tracheal intubation Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/041—Capsule endoscopes for imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00188—Optical arrangements with focusing or zooming features
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
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Abstract
The present invention discloses a kind of optical imaging method, system and capsule medical apparatus.The optical imaging method comprises the following steps：S10 obtains the maximum positive light coke P of Zoom lens unit+Max, maximum negative power P‑Photocentre distance d between max and the focal power Pmain and the main lens unit and the Zoom lens unit of main lens unit；S20 obtains maximum target distance of the Zoom lens unit under maximum negative power according to a default minimum target distance；S30 focuses in the minimum target distance and the maximum target distance range.The present invention also provides the optical imaging system based on above-mentioned optical imaging method and the capsule medical apparatus with the optical imaging system.The present invention can make full use of the optical property of Zoom lens unit, obtain preferable image quality.
Description
Technical field
The present invention relates to technical field of imaging, more particularly to a kind of optical imaging method, system and capsule medical apparatus.
Background technology
Zoom lens unit such as monomer liquid crystal lens or liquid crystal microlens array common at present, due to this kind of varifocal
For lens unit when device manufactures completion, its optical characteristics is just substantially stationary, because above-mentioned Zoom lens unit leads to
Overvoltage control can form convex lens or concavees lens, but in imaging system design, manufacturer is seldom considered to variable
Focus lens unit plays its maximum performance.
With the quickening of modern life rhythm, disease of digestive tract turns into people's regular incidence.Have to use in clinical at present and carry
The fujinon electronic video endoscope or Medical wireless endoscope (capsule endoscope) of intubation carries out the diagnosis of disease of digestive tract.Either electronics
Endoscope or capsule endoscope all carry capture apparatus, are shot by these capture apparatus in alimentary canal especially in enteron aisle
Pathological image.Thus optical imaging system, such as documents 1 are also required in the capsule endoscope of prior art
(CN103477269B, day for announcing 2016.01.06) discloses a kind of liquid crystal lens, liquid crystal lens driving method, lens unit, taken the photograph
Although camera module and capsule medical apparatus, above-mentioned capsule medical apparatus employ the liquid crystal as Zoom lens unit
Lens, major programme are that focal variation is realized in the structure realization by changing liquid crystal lens itself in capsule medical apparatus,
However, documents 1 do not account for being improved the optical property of liquid crystal lens, unlikely in capsule medical apparatus
According to the optimization optical design of capsule feature.
Therefore, prior art using the optical imaging method of Zoom lens unit, optical imaging system and use before
The capsule medical apparatus for stating optical imaging system is further improved on imaging mode.
The content of the invention
The present invention provides a kind of optical imaging method, optical imaging system and capsule medical apparatus, existing to solve
Not the problem of not accounting for maximizing the optical property for playing Zoom lens unit in technology.
The present invention provides a kind of optical imaging method, and the optical imaging method comprises the following steps：
S10 obtains the maximum positive light coke P of Zoom lens unit+Max, maximum negative power P-Max and main lens unit
Focal power Pmain and the main lens unit and the Zoom lens unit between photocentre distance d；
S20 obtains the Zoom lens unit under maximum negative power according to a default minimum target distance
Maximum target distance；Wherein, step S20 is specifically included：According to the default minimum target distance, the maximum target is calculated
The target range of distance and the Zoom lens unit under non-lens state, calculation formula are as follows：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, default minimum target distance D1 and image distance v relation,
2. formula represents under non-lens state 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power,
Relation between maximum target distance and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between
Difference can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3；
S30 focuses in the minimum target distance and the maximum target distance range.
The present invention also provides a kind of optical imaging system, wherein, the optical imaging system includes：
Zoom lens unit, form refractive index gradient distribution；
Main lens unit, optical imagery is formed for photographed scene；
Processing unit, for obtaining the maximum positive light coke P of the Zoom lens unit+Max, maximum negative power P-
Between max and the focal power Pmain and the main lens unit and the Zoom lens unit of the main lens unit
Photocentre distance d；According to a default minimum target distance, the Zoom lens unit is obtained under maximum negative power most
Big target range；Wherein, the processing unit also includes：
Data acquisition module, for obtaining target range of the Zoom lens unit under non-lens state；
Computing module, calculate the target range under the maximum target distance and the non-lens state, calculation formula
It is as follows：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, default minimum target distance D1 and image distance v relation,
2. formula represents under non-lens state 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power,
Relation between maximum target distance and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between
Difference can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3；
Focusing unit, for being focused in the minimum target distance and the maximum target distance range；
Imaging sensor, for optical imagery to be converted into electric signal.
The present invention also provides a kind of capsule medical apparatus, wherein, the capsule medical apparatus includes：
Capsule housing, at least part of light of capsule housing can penetrate；
Imaging system in capsule housing, wherein, the imaging system includes：
Zoom lens unit, form refractive index gradient distribution；
Main lens unit, optical imagery is formed for photographed scene；
Processing unit, for obtaining the maximum positive light coke P of the Zoom lens unit+Max, maximum negative power P-
Between max and the focal power Pmain and the main lens unit and the Zoom lens unit of the main lens unit
Photocentre distance d；According to a default minimum target distance, the Zoom lens unit is obtained under maximum negative power most
Big target range；Wherein, the processing unit also includes：
Data acquisition module, for obtaining target range of the Zoom lens unit under non-lens state；
Computing module, calculate the target range under the maximum target distance and the non-lens state, calculation formula
It is as follows：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, default minimum target distance D1 and image distance v relation,
2. formula represents under non-lens state 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power,
Relation between maximum target distance and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between
Difference can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3；
Focusing unit, for being focused in the minimum target distance and the maximum target distance range；
Imaging sensor, for optical imagery to be converted into electric signal.
It is preferred that minimum target distance for the outer wall of the Zoom lens unit to the capsule housing away from
From.
It is preferred that the capsule medical apparatus also includes：
Power supply, for providing working power for the capsule medical apparatus；
Signal transmission unit, data are received or sent when being worked for the capsule medical apparatus；
Light source, for providing illumination when the imaging system works；
Control unit, for controlling the capsule medical apparatus to work, wherein, when the imaging system works, according to
The brightness of the light source is adjusted according to the positional information of the capsule medical apparatus.
It is preferred that the Zoom lens unit is monomer liquid crystal lens or liquid crystal microlens array.
Optical imaging method, optical imaging system and capsule medical apparatus provided by the invention, to Zoom lens list
Member carries out optical property design, first sets default minimum target distance according to being actually needed, so by main lens unit, can
The optical parametric of Zoom lens unit etc. obtains its maximum target distance so that in the maximum target distance of Zoom lens unit
It can arbitrarily be focused with minimum target distance, in the case where ensureing that minimum target distance realizes focusing, realize the focusing range of maximum, fill
Divide the optical property using Zoom lens unit.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the optical imaging method of better embodiment of the present invention.
Fig. 2 is the structural representation of the optical imaging system of better embodiment of the present invention.
Fig. 3 is the structural representation of the capsule medical apparatus of better embodiment of the present invention.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.If it should be noted that do not conflicted, this hair
Each feature in bright embodiment and embodiment can be combined with each other, within protection scope of the present invention.
Fig. 1 is referred to, Fig. 1 is the schematic flow sheet of the optical imaging method of better embodiment of the present invention.The present invention's
Optical imaging method, mainly include the following steps that：
S10 obtains the maximum positive light coke P of Zoom lens unit+Max, maximum negative power P-Max and main lens unit
Focal power Pmain and the main lens unit and the Zoom lens unit between photocentre distance d；Need what is illustrated
It is that the optical power profile scope of Zoom lens unit is [P-max,P+Max], also focal power (optical power) is can
Zoom lens unit focal length f inverse.Further, Zoom lens unit is monomer liquid crystal lens or liquid crystal microlens array.It is single
Body liquid crystal lens refer to that the size of liquid crystal lens is larger, the requirement of zoom when a liquid crystal lens achieve that imaging, preferably
The size of monomer liquid crystal lens matches with the size of main lens unit.And main lens unit generally includes a system of focal length fixation
Row glass lens combines to be formed, and mainly forms fixed focal length photographed scene image.
S20 obtains the Zoom lens unit under maximum negative power according to a default minimum target distance
Maximum target distance；Minimum target distance is the minimum range that Zoom lens unit can focus.Determined in minimum target distance
Afterwards, according to P+max、Pmain、P-Max and d just can determine that out maximum target distance.
In step S20, the step S20 also includes：
S21 obtains target range of the Zoom lens unit under non-lens state.Target under non-lens state
Distance is between foregoing minimum target distance and maximum target distance.
In a preferred embodiment, the step S20 is specifically included：According to the default minimum target distance, calculate
The target range gone out under the maximum target distance and the non-lens state, calculation formula are as follows：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, default minimum target distance D1 and image distance v relation,
2. formula represents under non-lens state 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power,
Relation between maximum target distance and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between
Difference can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3.When can
When Zoom lens unit against each other with main lens unit, d values desirable 0.
Also above-mentioned formula is derived and is described as follows：
It is first depending on Gaussian imaging equation：1/f=1/u+1/v, and the focal power P=1/f of Zoom lens unit, optics
In imaging system, including main lens unit and Zoom lens unit, main lens unit are used for photographed scene image, and its focal length leads to
Often keep fixing, between maximum positive light coke and maximum negative power, according to relation, P=f between focal power P and voltage
(V1, V2), therefore it is the regulation that focal power can be achieved to adjust voltage.
Secondly, in aforementioned optical imaging system, the Zoom lens list in positive lens state when convex lens state (i.e.)
Member, its default minimum target apart from when, namely focal length value minimum fmin, corresponding maximum positive light coke P+max.Imaging system
Total focal length 1/F=1/fmain+1/fmin+d* (1/fmain) * (1/fmin), and 1/F=1/u+1/v, wherein, fmain is represented
The focal length of main lens unit, fmin represent the focal length at minimum target distance, focal length are substituted for into corresponding focal power, just drawn
Above-mentioned formula is 1..2. above-mentioned formula is that the focal length of Zoom lens unit is 0 because under non-lens state, therefore based on total focal length thoroughly
The focal length of mirror unit.Similarly, 3. above-mentioned formula is the relational expression obtained at maximum negative power, similar to above formula 1., no longer in detail
State.
S30 focuses in the minimum target distance and the maximum target distance range.Drawing maximum target distance
Afterwards, Zoom lens unit can be in above-mentioned minimum target distance and maximum target apart from interior zoom.Can thus learn can
The optical property of Zoom lens unit, so as to make full use of the optical property of Zoom lens unit.
Optical imaging method provided by the invention, optical property design is carried out to Zoom lens unit, needed according to actual
Default minimum target distance is first set, and then obtained by the optical parametric of main lens unit, Zoom lens unit etc.
Its maximum target distance so that can arbitrarily it be focused in maximum target distance and the minimum target distance of Zoom lens unit,
In the case where ensureing that minimum target distance realizes focusing, the focusing range of maximum is realized, makes full use of the optics of Zoom lens unit
Performance.
Fig. 2 is referred to, Fig. 2 is the structural representation of the optical imaging system of better embodiment of the present invention.The present invention is also
A kind of optical imaging system is provided, mainly included：
Zoom lens unit 10, form refractive index gradient distribution；When Zoom lens unit 10 is according to certain regular
When refractive index gradient is distributed, positive lens (convex lens) state or negative lens (concavees lens) state are showed.
Main lens unit 20, optical imagery is formed for photographed scene；Main lens unit 20 can be that multiple focal lengths are fixed
Glass lens combine to be formed；
Processing unit 30, for obtaining the maximum positive light coke P of the Zoom lens unit+Max, maximum negative power
P-Between max and the focal power Pmain and the main lens unit and the Zoom lens unit of the main lens unit
Photocentre distance d；According to a default minimum target distance, the Zoom lens unit is obtained under maximum negative power
Maximum target distance；
Focus unit 40, for control Zoom lens unit 10 the minimum target distance and the maximum target away from
Focused from the range of；
Imaging sensor 50, for optical imagery to be converted into electric signal.
In a preferred embodiment, the processing unit 30 also includes：
Data acquisition module, for obtaining target range of the Zoom lens unit under non-lens state.
In a preferred embodiment, the processing unit is being specifically used for the maximum of the acquisition Zoom lens unit just
Focal power P+Max, maximum negative power P-The focal power Pmain and the main lens unit of max and the main lens unit with
Photocentre distance d between the Zoom lens unit；According to a default minimum target distance, the maximum target is calculated
Target range under distance and the non-lens state, calculation formula are as follows：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, default minimum target distance D1 and image distance v relation,
2. formula represents under non-lens state 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power,
Relation between maximum target distance and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between
Difference can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3.
Optical imaging system provided by the invention, optical property design is carried out to Zoom lens unit, needed according to actual
Default minimum target distance is first set, and then obtained by the optical parametric of main lens unit, Zoom lens unit etc.
Its maximum target distance so that can arbitrarily it be focused in maximum target distance and the minimum target distance of Zoom lens unit,
In the case where ensureing that minimum target distance realizes focusing, the focusing range of maximum is realized, makes full use of the optics of Zoom lens unit
Performance.
Fig. 3 is referred to, Fig. 3 is the structural representation of the capsule medical apparatus of better embodiment of the present invention.Such as Fig. 3 institutes
Show, the present invention also provides a kind of capsule medical apparatus 100, this kind of capsule medical apparatus 100 such as capsule endoscope or carries
Diagnosis and the capsule robot of internal operative treatment.The capsule medical apparatus 100 includes：
Capsule housing 110, the 110 at least part of light of capsule housing can penetrate；
Imaging system 120 in capsule housing, wherein, the imaging system includes：
Zoom lens unit 10, form refractive index gradient distribution；
Main lens unit 20 (Fig. 3 does not show, referring to Fig. 2), optical imagery is formed for photographed scene；
Processing unit 30 (Fig. 3 does not show, referring to Fig. 2), for obtaining the maximum positive light coke P of the Zoom lens unit+Max, maximum negative power P-The focal power Pmain and the main lens unit of max and the main lens unit with it is described can
Photocentre distance d (not shown)s between Zoom lens unit；According to a default minimum target distance, obtain described variable
Maximum target distance of the focus lens unit under maximum negative power；Specifically, maximum mesh is calculated in the following ways
Target range under subject distance and the non-lens state is as follows：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, default minimum target distance D1 and image distance v relation,
2. formula represents under non-lens state 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power,
Relation between maximum target distance and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between
Difference can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3.
Focusing unit 40 (Fig. 3 does not show, referring to Fig. 2), in the minimum target distance and the maximum target distance
In the range of focus；
Imaging sensor 50 (Fig. 3 does not show, referring to Fig. 2), for optical imagery to be converted into electric signal.Cmos can be used
Imaging sensor or ccd image sensor.
In described above, it is noted that the corresponding capsule housing 110 of the Zoom lens unit 10 of imaging system 120
Light transmissive portion point.
In a preferred embodiment, the minimum target distance is the Zoom lens unit to the capsule housing
Outer wall distance.
Further, as shown in figure 3, the capsule medical apparatus at least also includes：
Power supply 130, for providing working power for the capsule medical apparatus；
Signal transmission unit 140, data are received or sent when being worked for the capsule medical apparatus；
Light source 150, for providing illumination when the imaging system works；150 preferred LED light source of light source, being distributed in can
Around Zoom lens unit 10.
Control unit 160, for controlling the capsule medical apparatus to work, wherein, when the imaging system works,
Positional information according to the capsule medical apparatus adjusts the brightness of the light source.Here the position of capsule medical apparatus
Information includes：Capsule medical apparatus in vivo relatively gastral posture (such as enteron aisle it is tilted, keep flat, vertical), can
Zoom lens unit apart from alimentary canal inwall first distance and light source luminescent partial distance alimentary canal inwall second distance,
This second distance is primarily to facilitate the brightness of control light source to provide Uniform Illumination so that imaging system is imaged in imaging
It is uneven, or there is the problem of dark space can not differentiate.It is such as relative to disappear using the posture of gyroscope measurement capsule medical apparatus
Change the angle of inclination in road, the numerical value of the first distance and second distance is measured with sensors such as infrared distance measurements.Furthermore, it is necessary to explanation
Be, capsule medical apparatus can be adjusted according to the distance of light source distance alimentary canal inwall, light source after whether can Uniform Illumination etc. come
Decide whether that starting imaging system is taken pictures, and can so be greatly reduced the picture amount of image quality difference, be reduced unnecessary biography
It is defeated, and the battery electric quantity of capsule medical apparatus is greatlyd save, extend its cruising time.
Further, the Zoom lens unit is monomer liquid crystal lens or liquid crystal microlens array.
Capsule medical apparatus provided by the invention, optical property design is carried out to Zoom lens unit, according to actual
Need first to set default minimum target distance, and then obtained by the optical parametric of main lens unit, Zoom lens unit etc.
Take its maximum target distance so that can be arbitrarily right in maximum target distance and the minimum target distance of Zoom lens unit
Jiao, in the case where ensureing that minimum target distance realizes focusing, the focusing range of maximum is realized, makes full use of the light of Zoom lens unit
Learn performance.
Embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this
The equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, it is included within the scope of the present invention.
Claims (6)
1. a kind of optical imaging method, it is characterised in that the optical imaging method comprises the following steps：
S10 obtains the maximum positive light coke P of Zoom lens unit+Max, maximum negative power P-Max and main lens unit light
Photocentre distance d between focal power Pmain and the main lens unit and the Zoom lens unit；
S20 obtains maximum of the Zoom lens unit under maximum negative power according to a default minimum target distance
Target range；Wherein, step S20 is specifically included：According to the default minimum target distance, the maximum target distance is calculated
It is as follows with target range of the Zoom lens unit under non-lens state, calculation formula：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, and default minimum target distance D1 and image distance v relation, formula is 2.
Represent under non-lens state, 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power, maximum
Relation between target range and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between difference
Value can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3；
S30 focuses in the minimum target distance and the maximum target distance range.
2. a kind of optical imaging system, it is characterised in that the optical imaging system includes：
Zoom lens unit, form refractive index gradient distribution；
Main lens unit, optical imagery is formed for photographed scene；
Processing unit, for obtaining the maximum positive light coke P of the Zoom lens unit+Max, maximum negative power P-Max and
Photocentre between the focal power Pmain of the main lens unit and the main lens unit and the Zoom lens unit away from
From d；According to a default minimum target distance, maximum target of the Zoom lens unit under maximum negative power is obtained
Distance；Wherein, the processing unit also includes：
Data acquisition module, for obtaining target range of the Zoom lens unit under non-lens state；
Computing module, calculates the target range under the maximum target distance and the non-lens state, and calculation formula is as follows：
Pmain+P+max–d*Pmain*P+Max=1/D1+1/v is 1.
Pmain=1/D2+1/v is 2.
Pmain+P-max–d*Pmain*P-Max=1/D3+1/v is 3.
In above-mentioned three formula, 1. formula is represented under maximum positive light coke, and default minimum target distance D1 and image distance v relation, formula is 2.
Represent under non-lens state, 3. the relation between target range D2 and image distance v, formula is represented under maximum negative power, maximum
Relation between target range and image distance v, when default minimum target distance D1 is determined, then using formula 2. with formula 1. between difference
Value can obtain target range D2, using formula 3. with formula 1. between difference can obtain maximum target distance D3；
Focusing unit, for being focused in the minimum target distance and the maximum target distance range；
Imaging sensor, for optical imagery to be converted into electric signal.
3. a kind of capsule medical apparatus, it is characterised in that the capsule medical apparatus includes：
Capsule housing, at least part of light of capsule housing can penetrate；
Imaging system in capsule housing, wherein, the imaging system is the optical imaging system described in claim 2.
4. capsule medical apparatus as claimed in claim 3, it is characterised in that the minimum target distance is described varifocal
Lens unit to the outer wall of the capsule housing distance.
5. capsule medical apparatus as claimed in claim 3, it is characterised in that the capsule medical apparatus also includes：
Power supply, for providing working power for the capsule medical apparatus；
Signal transmission unit, data are received or sent when being worked for the capsule medical apparatus；
Light source, for providing illumination when the imaging system works；
Control unit, for controlling the capsule medical apparatus to work, wherein, when the imaging system works, according to institute
The positional information for stating capsule medical apparatus adjusts the brightness of the light source.
6. capsule medical apparatus as claimed in claim 3, it is characterised in that the Zoom lens unit is monomer liquid crystal
Lens or liquid crystal microlens array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610892843.6A CN106377220B (en) | 2016-10-13 | 2016-10-13 | Optical imaging method, system and capsule medical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610892843.6A CN106377220B (en) | 2016-10-13 | 2016-10-13 | Optical imaging method, system and capsule medical apparatus |
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| CN102305967A (en) * | 2011-01-06 | 2012-01-04 | 沈阳理工大学 | Wide-field and low-distortion electronic hysteroscope optical imaging system |
| CN103477269B (en) * | 2011-01-17 | 2016-01-06 | 奥特司科技株式会社 | Liquid crystal lens, liquid crystal lens driving method, lens unit, camara module and capsule medical apparatus |
| JP5567224B2 (en) * | 2011-11-09 | 2014-08-06 | 富士フイルム株式会社 | Endoscope objective lens and endoscope |
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| CN203217158U (en) * | 2013-04-23 | 2013-09-25 | 张梅 | Zooming optical system, objective lens system of endoscope and electronic endoscope |
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