CN110215186A - One kind being automatically aligned to positioning fundus camera and its working method - Google Patents
One kind being automatically aligned to positioning fundus camera and its working method Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
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Abstract
The embodiment of the present disclosure discloses one kind and is automatically aligned to positioning fundus camera and its working method, is related to medical ophthalmology optical instrument field.Fundus camera includes: that optical system, double take the photograph are automatically aligned to positioning unit and control unit；Wherein, optical system includes focusing positioning optical path and illumination imaging optical path；Focusing positioning optical path and illumination imaging optical path share at least one optical module；Focusing positioning optical path includes at least one double wedge；It is double take the photograph be automatically aligned to positioning unit include two groups of cameras；Control unit acquires pupil image for controlling camera in real time, automatically determines pupil center according to pupil image and completes working distance positioning；For controlling, the focusing positioning optical path makes it complete automatic focusing and controlling the illumination imaging optical path makes its automatically snap eye fundus image；Fundus camera is not only realized that pupil of human is automatically aligned to and is positioned with working distance, moreover it is possible to greatly simplify optical texture while realizing automatic focusing, automatic shooting eye fundus image, user experience is good.
Description
Technical field
The present invention relates to medical ophthalmology optical instrument fields, and in particular to one kind is automatically aligned to positioning fundus camera and its work
Make method.
Background technique
Fundus camera is as a kind of medical eye examination equipment, for observing and obtain human eye eye fundus image, such as observes
Whether retina, optic disk, the vascular distribution on eyeground etc. are abnormal.The blood vessel on eyeground is that human body can uniquely be observed directly by body surface
Capillary, using fundus camera, doctor can be used to make the morning of a variety of diseases such as fundus oculi disease, nephrosis, hypertension, diabetes
Phase diagnosis.
The fundus camera occurred currently on the market does not have automatic positioning alignment function generally, can not achieve automatic shooting eye
Base map picture；And a small number of fundus cameras that can automatically snap eye fundus image are excessively complicated in the realization of automatic positioning alignment, need
Increase independent control unit and configure special software and external computer etc., causes being significantly increased in volume and cost；And
And current fundus camera needs to be equipped with professional operator to complete the shooting of eye fundus image mostly, so that eyeground phase
Machine is difficult to a large amount of popularization and applications, largely limits and affect the use of fundus camera.Therefore, exploitation has automatic positioning
Alignment function, structure are simple and realize that the fundus camera for being fully automated eye fundus image shooting is currently urgently to be resolved asks
Topic.
Summary of the invention
The present invention is intended to provide one kind is automatically aligned to positioning fundus camera and its working method, the prior art can be overcome
Defect, optical module is shared by optical system, reduces volume；Positioning unit and control unit reality are automatically aligned to using double take the photograph
Existing pupil of human is automatically aligned to be positioned with working distance, while realizing automatic focusing and eye fundus image shooting.Invention mesh of the invention
Be achieved by the following technical programs:
The first aspect of embodiments herein provides one kind and is automatically aligned to fundus camera packet described in positioning fundus camera
Include optical system, double take the photograph is automatically aligned to positioning unit and control unit；Wherein, the optical system include focusing positioning optical path and
Illuminate imaging optical path；The focusing positioning optical path and the illumination imaging optical path share at least one optical module；The focusing
Positioning optical path includes at least one double wedge；
It is described double to take the photograph that be automatically aligned to positioning unit include two groups of cameras；
Described control unit acquires pupil image for controlling the camera in real time, automatically true according to the pupil image
Determine pupil center and completes working distance positioning；It is completed described in automatic focusing and control for controlling the focusing positioning optical path
Illumination imaging optical path makes it automatically snap eye fundus image；It is also used to handle the eye fundus image taken.
Preferably, the optical module includes: in varifocus objective group, imaging sensor, annular reflective mirror and condenser
It is at least one.
Specifically, the varifocus objective group includes connecing mesh object lens and varifocal mirror.
Preferably, the camera includes lens group and imaging sensor.
Preferably, described control unit is specifically used for automatically determining pupil center according to the pupil image and generating pupil
Central point space coordinate；Working distance positioning is completed according to pupil center's space of points coordinate.
Specifically, when focusing positioning optical path completes automatic focusing under the control of described control unit, image is passed
Pre-set image can be presented on sensor.
Preferably, the focusing positioning optical path uses white light source；The illumination imaging optical path uses near-infrared light source.
Specifically, described control unit includes embeded processor, control circuit and display device；The embedded processing
Device and control circuit are specifically used for the control camera and acquire pupil image in real time, automatically determine pupil according to the pupil image
Simultaneously complete working distance positioning in hole center；Being also used to control the focusing positioning optical path makes it complete automatic focusing and the control photograph
Bright imaging optical path makes it automatically snap eye fundus image；The display device is for showing the eye fundus image.
The second aspect of embodiments herein provides a kind of working method for being automatically aligned to positioning fundus camera, application
It is automatically aligned to positioning fundus camera in as in the foregoing embodiment, method includes:
Acquisition pupil image in real time, and Pupil diameter is carried out according to the pupil image, it generates pupil center's space of points and sits
Mark；Working distance positioning is completed according to pupil center's space of points coordinate；
After being automatically performed focusing, starting light source carries out eyeground and takes pictures.
Preferably, method further includes that the fundus camera carries out pretreatment operation；
The pretreatment operation includes acquisition image, carries out camera calibration.
Advantageous effects of the invention: the present invention is automatically aligned to positioning unit and control unit realization people using double take the photograph
Eye pupil hole is automatically aligned to be positioned with working distance；It is greatly simplified while realizing automatic focusing, automatic shooting eye fundus image
Optical texture, structure is simple, and user experience is good.
Detailed description of the invention
Illustrate the embodiment of the present invention or technical solution in the prior art in order to clearer, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram for being automatically aligned to positioning fundus camera shown in the embodiment of the present application；
Fig. 2 is a kind of structural representation for being automatically aligned to positioning fundus camera focusing positioning optical path shown in the embodiment of the present application
Figure；
Fig. 3 is a kind of structural representation for being automatically aligned to positioning fundus camera illumination imaging optical path shown in the embodiment of the present application
Figure；
Fig. 4 is a kind of flow chart for being automatically aligned to positioning fundus camera working method shown in the embodiment of the present application；
Fig. 5 is parallel binocular stereo vision model schematic shown in the embodiment of the present application；
Fig. 6 is the coordinate relationship signal on parallel binocular stereo vision model projection to plane shown in the embodiment of the present application
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It present embodiments provides one kind and is automatically aligned to positioning fundus camera；As shown in Figure 1, fundus camera includes optical system
System, double take the photograph are automatically aligned to positioning unit and control unit 9；Wherein, the optical system include focusing positioning optical path and illumination at
As optical path；The focusing positioning optical path and the illumination imaging optical path share at least one optical module；Focusing positioning optical path packet
Containing at least one double wedge；
It is double take the photograph be automatically aligned to positioning unit include two groups of cameras, in real time acquire pupil image；
Described control unit acquires pupil image for controlling the camera in real time, automatically true according to the pupil image
Determine pupil center and completes working distance positioning；It is completed described in automatic focusing and control for controlling the focusing positioning optical path
Illumination imaging optical path makes it automatically snap eye fundus image；It is also used to handle the eye fundus image taken.
Specifically, optical module includes: varifocus objective group, imaging sensor, annular reflective mirror and condenser；Wherein, institute
Stating varifocus objective group includes connecing mesh object lens and varifocal mirror.
Preferably, focusing positioning optical path uses white light source；It illuminates imaging optical path and uses near-infrared light source.
Wherein, white light source is white LED lamp and/or white light LEDs annular lamp plate；The near-infrared light source is red
Outer LED light.
Specifically, optical system includes: white light LEDs annular lamp plate 1, the first condenser 2, aperture diaphragm 3, pellicle mirror 4,
Two condensers 5, third condenser 6, double wedges 7, infrared LED lamp 8, the first imaging sensor 10, switching mirror 11, varifocal mirror 12,
Annular reflective mirror 13 connects mesh object lens 14.
Further, as shown in Fig. 2, being automatically aligned to focusing positioning light in positioning fundus camera for one kind disclosed in embodiment
The structural schematic diagram on road；Wherein, focusing positioning optical path includes connecing mesh object lens 14, annular reflective mirror 13, second condenser lens 5, semi-transparent
Mirror 4, third condenser 6, double wedges 7, infrared LED lamp 8, varifocal mirror 12, switching mirror 11, the first imaging sensor 10；Work as focusing
When positioning optical path work, infrared LED lamp 8 issues infrared light, through double wedges 7, third condenser 6, pellicle mirror 4, second condenser lens
5, annular reflective mirror 13, connect the incident human eye eye ground of mesh object lens 14, it is reflective that the light of fundus reflex is connect mesh object lens 14, annular
It is imaged on mirror 13, varifocal mirror 12, the 11 to the first imaging sensor of mirror 10 of transferring；Due to being designed using double wedges, in exact focus
When, it can be observed that pre-set image on the first imaging sensor 10；Preferably, pre-set image is a complete rectangle speck,
Two separated rectangle specks can be observed when defocus；
The method that fundus camera disclosed in the present embodiment uses auto-focusing, judges two rectangle specks by control unit 9
The distance between come driving motor adjust varifocal mirror 12 be moved forward or rearward, realize quick exact focus.
It should be noted that the first imaging sensor 10, pellicle mirror 4, annular reflective mirror 13, human eye eye ground are total
Yoke plane；
In the present embodiment, focusing positioning optical path uses Zoom structure, is adapted to different diopter human eyes, focusing positioning
Optical path uses near-infrared LED light source, prevents pupil of human in focussing process from shrinking, and focuses and is split using double wedges as method guarantees accurately
Focusing, and light channel structure is simple.
Further, as shown in figure 3, being automatically aligned to positioning fundus camera for one kind disclosed in embodiment illuminates imaging optical path
Structural schematic diagram；Wherein, illumination imaging optical path includes: to connect mesh object lens 14, annular reflective mirror 13, second condenser lens 5, aperture light
Late 3, first condenser 2, white light LEDs annular lamp plate 1, varifocal mirror 12, switching mirror 11, the first imaging sensor 10；When illumination at
As optical path work when, white light LEDs annular lamp plate 1 issue light successively through the first condenser 2, aperture diaphragm 3, second condenser lens 5,
Annular reflective mirror 13 connects mesh object lens 14, the cyclization image at iris, from pupil edge incidence human eye；The light of human eye reflection passes through again
It connects mesh object lens 14, annular reflective mirror 13, varifocal mirror 12, be imaged on switching the 11 to the first imaging sensor of mirror 10, control unit 9 is complete
At image procossing, display and storage, corneal reflection veiling glare can effectively eliminate using white light LEDs annular lamp plate 1；
It should be noted that varifocal mirror 12 uses aspheric design, control veiling glare can be very good.
In the present embodiment, illumination imaging optical path uses White LED visible light source；It is used when shooting eye fundus image
LED glisten style of shooting, it can be achieved that moment capture eye ground clear image.
Further, fundus camera as shown in Figure 1, it is double take the photograph be automatically aligned to positioning unit include two groups of cameras: first
Camera and second camera；Wherein one group of camera is made of lens group and imaging sensor；Specifically, the first camera packet
Include the first lens group 15 and the second imaging sensor 16；Second camera includes the second lens group 17 and third imaging sensor
18；Wherein, the lens in two groups of two groups of cameras are identical with imaging sensor parameter；It should be noted that the first lens
Group 15 and the second lens group 17 need to be placed in parallel, so that optical axis is parallel with imaging surface；
Double take the photograph is automatically aligned to positioning unit and connect with control unit 9；Specifically, the first camera and second camera difference
It is connect by the second imaging sensor 16 and third imaging sensor 18 with control unit 9, the second figure is controlled by control unit 9
As sensor 16 and third imaging sensor 18 work at the same time, and processing calculating is carried out to the pupil image of acquisition, automatically determined
Pupil center, and pupil center's space of points coordinate is obtained, then the mobile entire optical lens of stepper motor is controlled by control unit 9,
Keep the optical axis of optical system coaxial with pupil, working distance is preset value, completes pupil of human positioning and working distance positioning；
Control unit 9 includes embeded processor, control circuit and display device etc., for focusing positioning optical path, photograph
Bright imaging optical path and it is double take the photograph the control for being automatically aligned to positioning unit, while imaging sensor in positioning unit is automatically aligned to double take the photograph
The eye fundus image that imaging sensor obtains in the pupil image and illumination imaging optical path obtained in real time carries out display and calculation processing；
The unit uses high-performance embedded processor, it can be achieved that the real-time of dual camera image is acquired and handled；The embedded place
It manages device and accesses No. three imaging sensors simultaneously, first complete the control to double imaging sensor images taken the photograph and be automatically aligned in positioning unit
System, then switch to the control to the imaging sensor image in illumination imaging optical path；Control unit 9 be also used to stepper motor into
Row control.
More specifically, the control of 9 pairs of control unit focusing positioning optical paths includes control to automatic focusing motor and infrared
The control of LED light 8；The controls of 9 pairs of control unit illumination imaging optical paths include cutting to white light LEDs annular lamp plate 1 and pellicle mirror 4
It changes control and control and image procossing is shot to eye fundus image；Control unit 9 is automatically aligned to the control packet of positioning unit to double take the photograph
The control to the first camera and second camera is included, specifically to the second imaging sensor 16 and third imaging sensor 18
Control, and the pupil image obtained in real time to the second imaging sensor 16 and third imaging sensor 18 is handled；Same time control
Unit 9 processed controls the movement of three axle position direction of stepper motor according to pupil image processing result；Wherein, control unit 9 is to eyeground figure
As processing includes preview, coding, processing and the storage to eye fundus image.
Further, embeded processor is specially high performance embedded SOC processor, is internally integrated two images
Processing unit, it can be achieved that high-definition picture real-time processing；And Peripheral Interface is abundant, can access 3 image sensings simultaneously
Device supports two imaging sensors to acquire and handle in real time, and the processor integrated level is high, low in energy consumption, convenient for the miniaturization of product
And intelligence.
It should be noted that imaging sensor described in the present embodiment, preferably cmos image sensor.
The present embodiment also discloses a kind of working method for being automatically aligned to positioning fundus camera, as shown in figure 4, specific works
Process includes:
Step 101: fundus camera carries out pretreatment operation；
Specifically, the pretreatment specifically includes acquisition image, carries out camera calibration；
More specifically, two identical cameras of parameter are placed in parallel in illumination imaging optical path when acquisition image
Two sides；Wherein the optical lens of camera uses 7 sheet glass lens, the imaging sensor of 200W pixel, and picture size is
480P/720P, two imaging sensors access embeded processor simultaneously, configure internal two ISP
(ImageSignalProcessor, picture signal device) carries out real-time synchronization image acquisition and processing；
Camera calibration specifically includes: setting the resolution ratio of the imaging sensor in two cameras as 480P, scaling board
Having a size of 9X6 gridiron pattern, 20 groups of uncalibrated image quantity, multiple scaling board images are shot from different perspectives, by calculating image surface
On point and scaling board on characteristic point between corresponding relationship calculate the inside and outside parameter of camera；It is passed by the image of left and right two
Sensor obtains uncalibrated image, carries out thick angle point grid to uncalibrated image；If extracted successfully, the angular coordinate of extraction is accurate to
Sub-pixel；If extraction is unsuccessful, image is re-read, until reading all successes of sub-pix point；If setting
The image of quantity all extracts successfully, then seeks the inside and outside parameter of left and right camera respectively.Left and right two is saved by above procedure to take the photograph
As each 20 groups of images of head, the library function call based on OpenCV emulates in PC machine, obtains the inside and outside parameter of camera.
In the present embodiment, camera calibration can be operated in off-line case.
It is only needed to do once it should be noted that fundus camera carries out pretreatment operation, for determining some necessary ginsengs
Number, without every time using all carrying out this operation.
Step 102: acquisition pupil image carries out Pupil diameter, generates pupil center's space of points coordinate；
In the present embodiment, Pupil diameter specifically includes: observing human eye pupil with different view using two cameras in left and right
Hole, and real-time binary conversion treatment and edge extracting are carried out respectively to the collected pupil image of left and right camera；Set iris
Detection range and radius traverse pupil image as round sliding window, count the pixel that round sliding edge gray value is 255
Number；If the pixel gray value that circle sliding window edge is more than 90% is 255, which is pupil center；
Binocular stereo vision imaging is to shoot based on principle of parallax and with different view Same Scene using two cameras,
Method by calculating the position deviation between image corresponding points, to obtain object dimensional geological information.Further, the present embodiment
Pupil center's point coordinate is generated using binocular stereo vision model as shown in Figure 5, is specifically included: in binocular stereo vision model
In, the optical axis direction of left and right camera is set as Zcl axis, Zcr axis, establishing left and right camera coordinate system is respectively Ocl-
XclYclZcl and Ocr-XcrYcrZcr, wherein Xcl axis is completely coincident with Xcr axis, and Ycl axis is parallel with Ycr axis, Zcl axis and Zcr
Axis is parallel；The upper left corner of left images plane sets Ool and Oor, respectively as the coordinate origin of image platform, establishes image slices picture
Plain coordinate system is Ool-ulvl, Oor-urvr, wherein the transverse and longitudinal axis of the transverse and longitudinal coordinate axis of image coordinate system and camera coordinate system
In parallel.Coordinate relationship on the parallel binocular stereo vision model projection to plane is as shown in Figure 6；If space point be A, three
Tieing up coordinate is (Xw, Yw, Zw), and coordinate of this in the camera imaging plane of left and right is respectively al (ul, vl), ar (ur, vr), ur
=ul-b, v=vr=vl, according to similar triangle theory, can calculate the distance between space A point and video camera is Zw:
Wherein, b is parallax range, i.e. the distance between left and right camera optical axis in above formula, and f is the coke of left and right camera
Away from.
According to the transformational relation of image pixel coordinates and physical coordinates system, available following relationship:
It is arranged to obtain the space coordinate of space point A by above formula, formula is as follows:
Wherein, u0 in above formula, v0 are the coordinate value of image pixel coordinates system origin, and ul-ur is between two cameras
Parallax；According to the method for Pupil diameter, pupil center's point can be obtained by the pupil image that left and right camera is shot and be located at image
On coordinate, by pupil center's point be located at the coordinate on image substitute into above formula, can be obtained pupil center's space of points seat
Mark.
It should be noted that the coordinate value of pupil center on the image is real-time on embeded processor using OpenCV
It is calculated.
Step 103: working distance positioning is completed according to pupil center's space of points coordinate；
Specifically, the base electrical machinery that described control unit 9 controls fundus camera is moved to pupil center's space of points coordinate, full
The positioning of sufficient pupil center alignment and working distance.
Step 104 is automatically performed focusing；
Specifically, due to being split using double wedges as screen design, after focusing positions optical path exact focus, in control unit 9
Display device on it can be seen that image on have a complete rectangle speck, two separated rectangles can be observed when defocus
Speck；By control unit 9 by judge the distance between two rectangle specks come driving motor adjust varifocal mirror 12 forward or to
After move, realize quick exact focus.
Step 105, progress eyeground are taken pictures.
Specifically, the visible light source in starting illumination imaging circuit is stronger by eyeground use such as white light LEDs annular lamp plate 1
Light moment illuminate, moment capture eye ground image, complete shooting.
Based on positioning fundus camera is automatically aligned to disclosed in the present embodiment, positioning unit and control are automatically aligned to using double take the photograph
Unit processed is realized that pupil of human is automatically aligned to and is positioned with working distance；While realizing automatic focusing, automatic shooting eye fundus image
Optical texture is greatly simplified, while being guaranteed into tablet quality and rate in blocks, while can access artificial intelligence system to eyeground figure
As carrying out intellectual analysis；And due to having used near-infrared light source and double wedges to split as focusing light path design, so that avoiding red
Outer finishing is irradiated to human eye, improves the safety of equipment；In addition, reducing the complexity of electronics and structure, user experience
Well.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. one kind is automatically aligned to positioning fundus camera, which is characterized in that the fundus camera include optical system, it is double take the photograph it is automatic right
Certainly bit location and control unit；Wherein, the optical system includes focusing positioning optical path and illumination imaging optical path；The focusing
Positioning optical path and the illumination imaging optical path share at least one optical module；The focusing positioning optical path includes that at least one is double
Wedge；
It is described double to take the photograph that be automatically aligned to positioning unit include two groups of cameras；
Described control unit acquires pupil image for controlling the camera in real time, automatically determines pupil according to the pupil image
Simultaneously complete working distance positioning in hole center；It is set to complete automatic focusing and the control illumination for controlling the focusing positioning optical path
Imaging optical path makes it automatically snap eye fundus image；It is also used to handle the eye fundus image taken.
2. fundus camera according to claim 1, which is characterized in that the optical module includes: varifocus objective group, image
Sensor, annular at least one of reflective mirror and condenser.
3. fundus camera according to claim 2, which is characterized in that the varifocus objective group includes connecing mesh object lens and zoom
Mirror.
4. fundus camera according to claim 1, which is characterized in that the camera includes lens group and image sensing
Device.
5. fundus camera according to claim 1, which is characterized in that described control unit is specifically used for according to the pupil
Image automatically determines pupil center and generates pupil center's space of points coordinate；Work is completed according to pupil center's space of points coordinate
Make away from positioning.
6. fundus camera according to claim 1, which is characterized in that when focusing positioning optical path is in described control unit
Control under when completing automatic focusing, pre-set image can be presented on imaging sensor.
7. fundus camera according to claim 1, which is characterized in that the focusing positioning optical path uses white light source；Institute
Illumination imaging optical path is stated using near-infrared light source.
8. fundus camera according to claim 1, which is characterized in that described control unit includes embeded processor, control
Circuit processed and display device；The embeded processor and control circuit are specifically used for the control camera and acquire pupil in real time
Image automatically determines pupil center according to the pupil image and completes working distance positioning；It is also used to control the focusing positioning
Optical path, which makes it complete automatic focusing and the control illumination imaging optical path, makes it automatically snap eye fundus image；The display device is used
In the display eye fundus image.
9. a kind of working method for being automatically aligned to positioning fundus camera, is applied to such as eye of any of claims 1-8
Bottom camera, which is characterized in that the described method includes:
Acquisition pupil image in real time, and Pupil diameter is carried out according to the pupil image, generate pupil center's space of points coordinate；Root
Working distance positioning is completed according to pupil center's space of points coordinate；
After being automatically performed focusing, starting light source carries out eyeground and takes pictures.
10. working method according to claim 9, which is characterized in that the method also includes: the fundus camera carries out
Pretreatment operation；
The pretreatment operation includes acquisition image, carries out camera calibration.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111035356A (en) * | 2019-12-28 | 2020-04-21 | 重庆师范大学 | Automatic aligning and focusing eye ground or anterior segment imaging system and method |
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