JP2002165762A - Fundus camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fundus camera which is capable of easily displaying an image in a similar color tone even in a different portion for displaying images while retaining an original color tone of image data, and also capable of displaying a picture in a color tone similar to that of a previously taken picture. SOLUTION: This fundus camera is provided with a photographic optical system having a means for photoelectrically photographing the fundus of a subject eye irradiated with a photographic lighting source, a monitor that displays a photographed image, a means for inputting color tone correction data to correct an image color tone to be displayed on the monitor, an image storage means for memorizing the photographed images outputted by the above photographic means, a means for allowing the above image storage means to memorize the photographed image outputted by the above photographic means and a storage means that allows the above image storage means to memorize the photographed image outputted by the above photographic means and the above inputted color correction data to be accompanied therewith, and a means for outputting the photographed image data and the color correction data memorized by the above image storage means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera for photographing a fundus of a subject's eye.

[0002]

2. Description of the Related Art A fundus camera is known in which a fundus of a subject's eye is photographed in color by an image sensor and the photographed image is displayed on a monitor. In a fundus camera, necessary information varies depending on an observation site and an observation purpose. Therefore, an image having a color tone from which the information can be obtained and an image having a color tone that can be easily diagnosed by an observer are desired.

Conventionally, as a method of changing the color tone of a captured image displayed on a monitor, there has been a method of changing the color tone on a program for developing image data, and a method of changing the color tone by using a color tone correction function of the monitor itself. .

[0004]

However, the above-described color tone correction method has the following problems.
That is, it is not easy to develop the image data on a different display unit on a program and display the same color, and if the image is changed to a color-corrected image, the original color tone of the original image cannot be retained.

Further, the manual operation of changing the color tone using the color tone correction capability of the monitor itself is complicated, and it is difficult to display the same color tone again once the color tone is changed to another color tone.

According to the present invention, it is possible to easily display an image in the same color tone on a different image display unit while maintaining the original color tone of the image data. It is an object of the present invention to provide a fundus camera capable of displaying the image.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) A fundus camera for photographing the fundus of the eye to be examined, a photographing optical system having an image pickup means for photoelectrically photographing the fundus of the eye to be examined illuminated by the photographing illumination light source, and a monitor for displaying the photographed image A color tone correction data input unit for inputting color tone correction data for correcting a color tone of an image displayed on the monitor; an image storage unit for storing a captured image output from the imaging unit; Storage means for storing the captured image output from the imaging means in the image storage means and for storing the input color tone correction data in association with the captured image data; and the captured image data stored in the image storage means And output means for outputting color tone correction data.

(2) In the fundus camera of (1), calling means for selecting photographed image data stored in the image storage means and calling color tone correction data attached to the image data, and calling color tone correction data And a color tone correcting means for performing a color tone correction on a photographed image obtained by a new photographing based on the above or other photographed image data stored in the image storage means.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of an optical system of a non-mydriatic retinal camera according to a first embodiment. The optical system is roughly divided into an illumination optical system 1, a photographing optical system 2, and an observation optical system 3.

<Illumination Optical System> A light beam emitted from a halogen lamp 10 serving as an observation light source is
After passing through the condenser lens 12, the light is reflected by the half mirror 15, and is reflected by the ring slit 1.
Illuminate 6. A visible light beam emitted from a flash lamp 13 serving as a photographing light source is
After passing through 4, the light passes through the half mirror 15 and is coaxially synthesized with the infrared light beam for observation, and illuminates the ring slit 16.

The luminous flux from the ring slit 16 forms an intermediate image near the opening of the perforated mirror 21 via the relay lens 17a, the mirror 18, the black spot plate 19, and the relay lens 17b. The light is reflected on the peripheral surface of the perforated mirror 21 so as to be coaxial with the axis. Perforated mirror 2
The ring slit light beam reflected by 1 once forms an image near the pupil of the eye E by the objective lens 20 and then diffuses to uniformly illuminate the fundus of the eye.

<Shooting Optical System> The shooting optical system 2 includes an objective lens 20, a shooting stop 22, a filter 23 for cutting harmful light such as flare, a focusing lens 24 movable in the optical axis direction, an imaging lens 25, and a dichroic lens. The camera includes a mirror 26 and a camera unit 27 having a color CCD camera for photographing a still image. RG from camera unit 27
The B color digital image signal is output. The dichroic mirror 26 has a characteristic of reflecting infrared light and transmitting visible light. The reflected light flux from the fundus is once formed into an intermediate image of the fundus by the objective lens 20 and then the perforated mirror 21
, An imaging aperture 22, a filter 23, a focusing lens 24, an imaging lens 25, and a dichroic mirror 26, and then enter a CCD camera of a camera unit 27 to form a fundus image on the image sensor surface.

<Observation Optical System> The observation optical system 3 is configured so that the dichroic mirror 26
The dichroic mirror 26 branches the optical path of the infrared light. The infrared reflected light flux from the fundus reflected by the dichroic mirror 26 is transmitted through the relay lens 30 and then reflected by the mirror 31 to be incident on the observation CCD camera 32 having sensitivity in the infrared region. To form a fundus image.

FIG. 2 is a block diagram of the control system. A digital image signal from the camera unit 27 for photographing is input to a temporary storage unit 51, and an image processing unit 52 that performs image processing such as color tone correction, and a color monitor 60 via an image switching unit 53.
Is output to The image switching unit 53 switches the display on the color monitor 60 to a moving image observed by the observation camera 32, a still image from the camera unit 27, or the like. Reference numeral 50 denotes a control unit for the entire fundus camera, and the camera unit 27 and the temporary storage unit 5
1. Image processing unit 52, image switching unit 53, flash lamp dimming unit 57, data storage unit 55, memory 56 such as data rewritable E ² PROM, external computer 7.
USB for data communication (data transmission / reception) with 0
An interface 58 and a photographing switch 59 are connected.

The input unit 61 includes a switch group 62 that performs different switch functions in accordance with the display on the monitor 60, a lever 63 for inputting an operation signal for moving a cursor or the like on the monitor 60, a numeric keypad 64, a light amount adjustment knob. 65a, a focus knob 65b and the like are provided.

The external computer 70 has an image storage 71
, An image processing unit 72, a control unit 73, a monitor 74 for displaying images, and input means 75 such as a keyboard and a mouse.

Next, the operation of this embodiment will be described.

At the time of photographing, a photographing mode is selected by a mode switch 61a provided in the switch group 62. The operation mode status of the apparatus is displayed on the monitor 60. In the photographing mode, the halogen lamp 10 is turned on, and the subject's eye E is illuminated with infrared light. The image of the eye to be inspected illuminated with the infrared light is formed on the CCD camera 32 of the observation optical system 3, and the image is displayed on the monitor 60. The photographer observes the display on the monitor 60 and adjusts the position of the fundus camera device with respect to the subject's eye. Also, the focusing lens 24 is moved to perform focusing. In addition, the subject's eye E is gazed at a fixation lamp (not shown) to guide the line of sight of the subject's eye.

When the photographing position is determined, the photographing switch 59 is pressed to execute photographing. The control unit 50 includes a lamp driving unit 57
To drive the flash lamp 13 to emit light so as to have a set light amount. The light amount at this time is set by the light amount adjustment knob 65a. Flash lamp 1
The fundus image is photographed by the camera unit 27 in synchronization with the light emission of No. 3, and the obtained fundus image is stored in the temporary storage unit 51 as an original image.

A photographing mode is selected by a mode switch 61a provided in the switch group 62. The operation mode status of the apparatus is displayed on the monitor 60. In the photographing mode, the halogen lamp 10 is turned on, and the subject's eye E is illuminated with infrared light. The image of the eye to be inspected illuminated with the infrared light is formed on the CCD camera 32 of the observation optical system 3, and the image is displayed on the monitor 60. The photographer observes the display on the monitor 60 and adjusts the position of the fundus camera device with respect to the eye to be inspected and performs focusing by moving the focusing lens 24. In addition, the eye E to be inspected is gazed at a fixation lamp (not shown), and the photographic position is determined by guiding the line of sight of the eye to be inspected.

When the photographing position is determined, the photographing switch 59 is pressed to execute photographing. The control unit 50 supplies a drive signal to the light control unit 57 to cause the flash lamp 13 to emit light so as to have a set light amount. The light amount at this time is set by the light amount adjustment knob 65a. The fundus image is photographed by the camera unit 27 in synchronization with the emission of the flash lamp 13, and the obtained fundus image is stored in the temporary storage unit 51.

When the photographed image is obtained, the mode is switched from the photographing mode to the image reproducing mode under the control of the control unit 50, and the image stored in the temporary storage unit 51 is displayed on the monitor 60. At this stage, the original image determined by the photographing system of the fundus camera is displayed. When changing the image displayed on the monitor 60 to a color tone that is easy for the observer to diagnose, the mode switch 61a
And so on, and selects a display color tone correction screen from the environment setting mode.

FIG. 3 shows an example of a color tone correction screen for display.
On the left side of the screen, parameter change items 110 to 113 for color tone correction are displayed at positions corresponding to the switches 62a to 62e. Adjustment item 11 of red component by F1 switch 62b
When 0 is selected, the cursor 101 appears in the left parenthesis. The left parenthesis of the item 110 is a column for inputting the value of the change ratio of the color balance based on green, and the numerical value of the change value is input by the ten keys 64. When the lever 63 is tilted to the right, the cursor 101 moves into the right parenthesis. The right parenthesis is a field for inputting a brightness offset value, and a numerical value is similarly input using the ten keys 64. When the F1 switch 62b is pressed again, the color of the fundus image 100 displayed on the monitor 60 is changed by the color correction processing of the image processing unit 52 according to the input value.

When the user selects the blue component adjustment item 111 by pressing the F2 switch 62c, the cursor 10
Since 1 is displayed, the ratio of the color balance in the blue component can be changed by the left parenthesis, and the brightness offset value can be changed by the right parenthesis. When an item 112 for changing the overall brightness (contrast) is selected by the F3 switch 62d, a cursor 101 is displayed at the left parenthesis of the item. In the left parenthesis, enter a value to change the ratio of the overall brightness. Lever 63
By moving the cursor 101 to the right parenthesis, the offset amount can be changed.

As described above, by selecting a parameter change item with the F1 switch 62b to F3 switch 62d and pressing the switch again, the original stored in the temporary storage unit 51 by the image processing unit 52 according to the change value of each parameter. The RGB luminance signal for the image data is increased or decreased,
The color tone of the fundus image 100 on the monitor 60 is changed. The F4 switch 62e is a switch for returning the color correction to the default value. When the F4 switch 62e is pressed, the value in the left parenthesis of each parameter becomes 1.0, and the value in the right parenthesis becomes 0. Is restored to the original image (reference color tone) stored in. As a parameter change item of color correction, a γ correction item may be further added.

When the original image data stored in the temporary storage section 51 is stored in the data storage section 55, the mode switch 6
1a to open an ID input screen, and enter an ID number for identifying the subject and the photographed image thereof with the ten keys 64 (I
The input of the D number can be performed before photographing is performed). After that, the F4 switch 6 indicating image storage in the image reproduction display
By pressing 2e, the original image data stored in the temporary storage unit 51 is given an ID number and stored in the data storage unit 55. At this time, the display color correction parameters input as described above are transferred from the image processing unit 52 under the control of the control unit 50, and stored in the data storage unit 55 along with the original image data (FIG. 4). reference).

After the color of the fundus oculi image 100 on the monitor 60 is adjusted to a desired color, the mode switch 61a is depressed and the color tone correction screen is cut off, so that the input color correction parameters are stored in the memory 56. Then, when photographing is subsequently performed, the color correction parameters for display stored in the memory 56 are transferred to the image processing unit 52,
An image obtained by performing color correction on the captured image (original image) stored in the temporary storage unit 51 based on the color correction parameters is displayed on the monitor 60. Thus, the photographer can observe an image on which the same color correction processing as that of the previous display image has been performed, without performing an operation for color correction every time a photograph is taken.

A case where an image stored in the data storage unit 55 is reproduced and displayed on the monitor 60 will be described. FIG. 5 is a file list screen for calling the original image data stored in the data storage unit 55. This screen is selected and called by the mode switch 62a. In this screen display, the cursor 120 is moved by moving the lever 63 up and down to select image data, and then F, which means loading, is performed.
Press the 1 switch 62b. In response to the call instruction, the original image data is transferred from the data storage unit 55 to the temporary storage unit 51, and the color correction parameters for display attached to the original image data are transferred to the image processing unit 52. Then, by the color correction processing of the image processing unit 52, an image color-corrected based on the color correction parameters is displayed on the monitor 60. This allows the observer to observe the previously color-corrected image. When it is desired to return the display on the monitor 60 from the color-corrected image to the original image, by pressing the F4 switch 62e on the screen shown in FIG. 3, the image is immediately converted to the original image and displayed.

A case where an image is displayed on the monitor 74 of the external computer 70 will be described. The observer also opens the file screen and selects an image by ID number,
By pressing the F3 switch 62d meaning image transfer, a transfer instruction is input. The selected image includes an attached color correction parameter and other accompanying data (such as an ID number).
At the same time, the data is output to the image storage unit 71 of the external computer 70 via the USB interface 58. On the external computer 70 side, the transferred image is called by designating the ID number by the input means 75. At this time, since the color correction parameters are attached to the original image data, the image processing unit 72 performs the same color correction processing as that of the retinal camera body side using the color correction parameters, so that the image displayed on the monitor 60 is displayed. Is displayed on the monitor 74.

When the external computer 70 performs analysis in various diagnoses, the image storage 71 stores the photographed original image data as it is, so that the color information resulting from the color tone correction for display is stored. Analysis using original color information of the image data can be performed while preventing loss.

It is also possible to easily observe other original image data in the same color tone by using the color correction parameters attached to the original image data. That is, the color correction parameters attached to the original image data are called, and the image processing unit 72 performs color correction processing using the called color correction parameters for other original images photographed at different times or the like. To be displayed. An instruction to call out color correction parameters and an instruction to process an image are made by the input unit 75. As a result, images in the state where the same color correction has been performed on different images can be observed on the monitor 74, which can be useful for diagnosis.

This can be displayed on the monitor 60 of the retinal camera device side for observation. Further, it is possible to perform the same color correction as that of the previous image on the image at the time of executing the photographing. For example, when it is desired to display on the monitor 60 an image that has been subjected to the same color tone correction as an image previously captured during follow-up observation or the like, the previously captured image is once called from the data storage unit 55. Then, similarly to the setting of the color correction, the environment setting mode is set by the mode switch 61a or the like, and the color tone correction screen for display (FIG. 3) is selected from the environment setting mode. Since the screen at this time contains the color correction parameters of the called image, the color correction parameters are stored in the memory 56 by pressing the mode switch 61a and leaving the color tone correction screen. When shooting is performed in the shooting mode, the memory 56
The image processing unit 52 performs color correction processing based on the display color correction parameters stored in the monitor 6.
At 0, an image that has been subjected to the same color tone correction as the previously captured image is displayed. Once the color correction data for display is set in this way, without performing the color correction input operation for each shooting,
The photographed image can be observed on the monitor 60 in a color tone desired by the observer.

[0035]

As described above, according to the present invention,
While maintaining the color tone of the captured image data (original image),
Images with corrected color tone can be easily and similarly displayed on different image display units. In addition, different images can be displayed with the same color tone correction by the color tone correction performed in the previous shooting.

[Brief description of the drawings]

FIG. 1 is a diagram showing an optical system of a fundus camera according to the present invention.

FIG. 2 is a block diagram of a control system of the fundus camera.

FIG. 3 is a diagram showing an example of a color tone correction screen for display.

FIG. 4 is a diagram showing that when original image data is stored in a data storage unit, a color correction parameter for display is attached and stored.

[Explanation of symbols]

 Reference Signs List 1 illumination optical system 2 photographing optical system 10 halogen lamp 27 camera unit 50 control unit 51 temporary storage unit 52 image processing unit 55 data storage unit 56 memory 60 monitor 110, 111, 112, 113 parameter change items

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 1/48 H04N 9/04 B 5C079 7/18 9/64 R 9/04 9/73 G 9/64 1/40 D 9/73 1/46 A F term (reference) 5B057 AA07 BA19 CA01 CA08 CA12 CA16 CB01 CB08 CB12 CB16 CC01 CE17 CH11 CH20 DB02 DB06 DB09 DC25 5C054 AA01 CA04 CA05 CC03 EA01 EA05 EA07 EE06 EE08 FB03 GC03 FC03 HA12 5C065 AA04 BB01 BB05 BB41 CC01 CC08 DD02 EE02 EE03 EE16 GG30 GG44 5C066 AA01 CA05 CA17 EA13 EC05 GA01 KE07 KM01 KM05 KM10 KM11 5C077 LL17 MM03 MP08 PP32 PP37 PQ22 SS01C07 MA03 MA01 NA073

Claims (2)

[Claims] 1. A fundus camera for photographing a fundus of a subject's eye, a photographing optical system having an image pickup means for photoelectrically photographing a fundus of the subject's eye illuminated by a photographing illumination light source, and a monitor for displaying a photographed image. Color tone correction data input means for inputting color tone correction data for correcting the color tone of an image displayed on the monitor; image storage means for storing a photographed image output from the image pickup means; A storage unit for storing the captured image output from the imaging unit in the storage unit and storing the input color tone correction data in association with the captured image data; and a captured image data stored in the image storage unit. An output unit that outputs color tone correction data. 2. A fundus camera according to claim 1, further comprising: calling means for selecting the photographed image data stored in said image storage means and calling color tone correction data attached to the image data; A fundus camera, comprising: a color tone correcting unit configured to perform a color tone correction on a captured image obtained by a new image capturing based on the captured image data or other captured image data stored in the image storage unit.