JPH09238906A - Ophthalmologic photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To check the quality of a picture by a simple display means requiring no display means for high definition. SOLUTION: A luminous flux from a light source 10 lights eye grounds Er of eyes E to be inspected passing through a lens 15, a stop 16, a bored mirror 17 and an objective lens 11 and a retinal image lighted passes through the objective lens 11, the bored mirror 17, a focusing lens 18 and an image pickup lens 19 to form an image on an imaging surface 20a of an image pickup means 20. An image data formed is stored into a memory mean 22 being maintained as high definition image by an image processing section 21 and a total retinal image is displayed on a monitor 4 as simple image minus the quantity of information. One area in the retinal image stored in the memory means 22 is selected and displayed on the monitor 4 as high definition image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmic photographing apparatus used for fundus examination and the like in an ophthalmology clinic.

[0002]

2. Description of the Related Art In a conventional ophthalmologic photographing apparatus, a fundus image of a subject's eye is photographed, and then a fundus image is displayed on a display means provided in the main body to measure a photographing range, brightness, contrast,
Checking flare and focus. Further, in recent years, image pickup means for picking up a high-definition electronic image have been developed, and the high-definition image is reproduced as it is on the display means and used for ophthalmic diagnosis.

[0003]

However, in order to reproduce a photographed image in high definition as in the above-mentioned conventional example, an expensive and large-scale display means is required, and such a display means is incorporated in the main body. By providing the retinal camera, the size of the fundus camera becomes large, the movement of the stage for alignment becomes heavy, and it is difficult to perform delicate position alignment.

It is also known that a small and simple reproducing means such as a liquid crystal monitor is provided in a photographing device as a display means for confirming a photographed image.
Since such a display means has a reproducible resolving power inferior to that of a captured image, it has a drawback that the image quality such as focus cannot be confirmed.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide an ophthalmologic photographing apparatus capable of confirming image quality with a simple display means without requiring a high-definition display means.

[0006]

To achieve the above object, an ophthalmologic photographing apparatus according to the present invention comprises an image pickup means for picking up an image of an eye to be inspected, and a display means for displaying the image of the eye to be inspected picked up by the image pickup means. It is characterized by further comprising control means for switching the size of an image taken by the image pickup means and displaying it on the display means, and selecting means for selecting an image area to be displayed on the display means.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a perspective view of a fundus camera of the embodiment, in which a stage unit 2 which is movable back and forth and left and right is placed on a base 1, and a measuring unit 3 is provided on the stage unit 2. On the examiner side of the stage unit 2, a monitor 4 as a display unit, an operating rod 5 having a photographing switch 5a, a selection switch 6 for selecting a simple display mode and a high-definition display mode, and a scroll switch for setting an enlarged display area. 7 is arranged.

FIG. 2 is a block diagram of the measuring unit 3, in which a diaphragm 12 having a ring-shaped opening, a lens 13, and visible light are blocked on the optical path from the observation / photographing light source 10 such as a lamp to the objective lens 11. An infrared filter 14, which transmits only infrared light and can be freely inserted into and removed from the optical path, a relay lens 15, a diaphragm 16 having a ring-shaped aperture, and a perforated mirror 17 are sequentially arranged. In the optical path behind the perforated mirror 17, a focusing lens 18 for performing focusing, a photographing lens 19, and a two-dimensional C
An image pickup means 20 capable of performing color image pickup with respect to visible light by an observation and image pickup camera such as a CD is arranged.

The output of the image pickup means 20 is connected to an image processing section 21 for converting the data from the image pickup means 20 into a digital signal or converting the digital data into an analog signal to generate a video signal. Is connected to a memory means 22 for storing image data and calculation data, a CPU (central processing unit) 23, and a monitor 4, respectively. Further, the CPU 23 has an operating rod 5, a selection switch 6,
The outputs of the scroll switches 7 are connected to each other.

In such a structure, the luminous flux emitted from the light source 10 passes through the aperture of the diaphragm 12, the lens 13 and the infrared filter 14 to remove the visible light component, and further the lens 15 and
It passes through the aperture of the diaphragm 16 and is reflected to the left by the mirror portion of the perforated mirror 17, passes through the objective lens 11, and passes through the eye E to be examined.
The fundus Er is illuminated from the pupil Ep of. The fundus image illuminated in this way passes from the pupil Ep to the objective lens 11 and the perforated mirror 1.
An image is formed on the image pickup surface 20a of the image pickup means 20 through the hole of No. 7, the focusing lens 18, and the photographing lens 19. Then, this video is converted into an electric signal and input to the image processing unit 21,
A fundus image is displayed on the monitor 4.

The examiner checks the fundus image of the subject's eye E displayed on the monitor 4 to confirm the imaged region, alignment, and focus state. If the focus is not good, the focusing lens 18 is moved in the optical axis direction using a focus adjusting means such as a focus knob (not shown) to adjust the position. And
After confirming that the fundus image reflected on the monitor 4 is in good focus, the examiner operates the photographing switch 5 to shift to the photographing operation.

When the photographing switch 4 is pushed, the amount of light emitted from the light source 10 increases, the infrared filter 14 is removed from the optical path, and the image pickup means 20 starts accumulation for still image photographing. Light source 10
Visible light from the lens passes through the apertures of the lens 15 and the diaphragm 16, is reflected to the left by the mirror portion of the perforated mirror 4, passes through the objective lens 11, and illuminates the fundus Er from the pupil Ep of the eye E to be examined.

The illuminated fundus image passes from the pupil Ep, passes through the objective lens 11, the hole portion of the perforated mirror 4, the focusing lens 18 and the photographing lens 19 and forms an image on the image pickup surface 20a of the image pickup means 20. Then, the image data output from the image pickup unit 20 is A / D converted by the image processing unit 21, and the memory unit 22.
The image processing section 21 selects data from the memory means 22, D / A converts the digital data to generate a video signal, and simply displays the whole image on the monitor 4.

At this time, 1.3 million pixels (horizontal 1268 × vertical 1012) are used as the image sensor 20, and 270,000 pixels (horizontal 600 × vertical 45) are used as the display means.
When the liquid crystal monitor 4 of about 0) is used, it is impossible to display all the information on the monitor 4, so the image processing unit 21 thins out the information and reproduces it for simple display.

In this way, by displaying an image that has a small amount of information but overlooks the entire area, it is possible to efficiently confirm the shooting range and the presence or absence of flare. The examiner confirms the presence or absence of flare, the shooting range, and the like from the entire image displayed on the monitor 4, and then operates the selection switch 6 to switch to the high-definition display mode and confirm the image quality such as focus.

FIG. 3 shows the image pickup range and display range of the fundus Er, and the region R is imaged by the image pickup means 20 and the memory means 22.
Shows the range stored in. By operating the selection switch 6, the CPU 23 calls the data in the area D1 from the data stored in the memory means 22, and the image processing section 21 D / A converts these data to generate a video signal, as shown in FIG. The area D1 is enlarged and displayed in high definition on the monitor 4. In this case, considering the performance of the high-definition monitor 4,
It is preferable to enlarge and display the image stored in the memory means 22 so that the contrast of the image can be reproduced to the maximum extent.

Next, the examiner operates the scroll switch 7 to change the display area. When the CPU 23 detects the input of the scroll switch 7 in the four directions 7a to 7d, it calls the data corresponding to the direction from the memory means 22, and the image processing unit 21 D / A converts these data to generate a video signal. , Change the range displayed on the monitor 4. By operating the scroll switch 7 in this way,
It is possible to move the screen in all directions of up, down, left and right, and it is possible to display an arbitrary portion of an image with high definition.

For example, in order to confirm the focus of the lower left blood vessel shown in the area D2 of FIG. 3, if the switch 7a for moving the screen to the right and the switch 7b for moving the screen upward are operated, as shown in FIG. An image of the lower left blood vessel portion can be displayed on the monitor 4. If the scroll switch 7 is arranged in the vicinity of the photographing switch 5 on the front side of the examiner on the stage portion 2, it can be operated with one hand, so that the efficiency of the examination is improved and the diagnosis can be performed easily. It will be possible to do.

The photographed electronic image may be displayed on another external display means connected to the fundus camera by a cable, but if it is displayed using the monitor 4 built in the main body as in this embodiment. , Without increasing the overall size of the device,
It can be made compact and lightweight and convenient for carrying around.
On the other hand, since the small and lightweight monitor 4 has a low resolution, it is impossible to evaluate the image quality with resolving power such as focus. However, as in the present embodiment, it is possible to perform an enlarged display or select an enlarged region. By providing the above, the image quality can be evaluated even with the small and lightweight monitor 4. In this way,
The examiner can reproduce the picked-up image with the same image quality as it is on the spot, and can perform efficient ophthalmologic diagnosis.

It should be noted that the normal observation screen displays character information relating to the subject and the image taken together with the image of the eye to be inspected. However, during magnified observation, the display of the character information may be automatically erased. In this case, it is possible to further improve the inspection efficiency without hindering the confirmation of the image quality.

Further, in the present embodiment, a dedicated switch 6 for switching between simple reproduction and high-definition reproduction of an observed image is provided, but this switch 6 is also used as a conventional photographing switch 5a and anterior ocular segment fundus changeover switch. Alternatively, when the main body of the optical system is aligned with the eye E to be inspected, the movement of the stage base 2 which is moved back and forth and right and left may be detected and switched.

[0022]

As described above, the ophthalmologic imaging apparatus according to the present invention comprises display means for simply displaying the image of the eye to be examined, control means for selecting and displaying a partial area of the enlarged image, and selecting means. With the provision, the image quality of the picked-up image can be confirmed by continuously changing the display range in the state of high-definition display without using an expensive display unit having high resolution. It is possible to perform diagnosis efficiently while checking the image quality on site.

[Brief description of drawings]

FIG. 1 is a perspective view of a fundus camera of an embodiment.

FIG. 2 is a configuration diagram.

FIG. 3 is an explanatory diagram of an image pickup and display range on a fundus.

FIG. 4 is an explanatory diagram of an enlarged monitor screen.

FIG. 5 is an explanatory diagram of a scrolled monitor screen.

[Explanation of symbols]

 1 base 2 stage part 3 measuring part 4 monitor 6 selection switch 7 scroll switch 10 light source for observation and photographing 14 infrared filter 17 perforated mirror 20 imaging means 21 image processing part 22 memory means 23 CPU

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Masuda, 53 Imaiue-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture, Kosugi Plant, Canon Inc. (72) Kenji Kitamura 53, Imaiue-cho, Nakahara-ku, Kawasaki, Kanagawa Prefecture Canon Kosugi Plant Co., Ltd. (72) Inventor Hiroshi Nishihara 53 Imaiuemachi, Nakahara-ku, Kawasaki-shi, Kanagawa Canon Inc. Kosugi Plant

Claims (3)

[Claims] 1. An image pickup unit for picking up an image of an eye to be inspected, a display unit for displaying the image of the eye to be inspected picked up by the image pickup unit, and an image picked up by the image pickup unit is displayed on the display unit by changing the size. An ophthalmologic imaging apparatus comprising: a control unit and a selection unit that selects an image region to be displayed on the display unit. 2. The ophthalmologic imaging apparatus according to claim 1, wherein the selection unit is a scroll unit that continuously changes the display area while maintaining the enlarged high-definition image. 3. The image pickup means, the display means, the control means, and the selection means are provided in one device.
An ophthalmologic photographing apparatus according to item 1.