JP2020162823A - Scanning ophthalmologic imaging apparatus - Google Patents

Abstract

To provide a scanning ophthalmologic imaging apparatus capable of obtaining a good photographic image.SOLUTION: A scanning ophthalmologic imaging apparatus to capture an image of a subject's eye includes an imaging light source to emit a laser beam, scanning means having deflection means to deflect the laser beam and a polygon mirror for scanning a subject's eye with laser beam two-dimensionally by driving the deflection means and the polygon mirror, a photo detector to receive reflected light of the laser beam that scanned the subject's eye, image processing means to create a captured image of the subject's eye on the basis of photodetection signals from the photo detector, and identification means to identify a reflection surface hit by the laser beam from among plural reflection surfaces formed on the polygon mirror. The identification means has rotation reference detection means to detect a rotation reference to be a reference of one rotation of the polygon mirror and identifies the reflection surface hit by the laser beam by using at least a detection result by the rotation reference detection means. The image processing means creates a captured image that is calibrated on the basis of an identification result by the identification means.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a scanning ophthalmologic imaging apparatus that images an eye to be examined.

Conventionally, there is known a scanning ophthalmologic imaging apparatus that obtains a fundus image by scanning a laser beam two-dimensionally with respect to an eye to be inspected and receiving the reflection thereof. In such a scanning ophthalmologic imaging apparatus, for example, a polygon mirror and a galvano mirror are combined to scan the laser beam two-dimensionally on the fundus (see Patent Document 1).

Japanese Patent Application Laid-Open No. 6-114008

By the way, the formation angles between the mirrors of the polygon mirrors should normally be the same, but the actual formation angles are slightly different due to the manufacturing error of the polygon mirrors. The scanning position of the laser beam was displaced, and the image was sometimes distorted.

In view of the above problems, the present disclosure has a technical problem of providing a scanning ophthalmologic imaging apparatus capable of acquiring a good captured image.

In order to solve the above problems, the present disclosure is characterized by having the following configurations.

A scanning ophthalmic imaging device that photographs an eye to be inspected, comprising a imaging light source that emits laser light, a deflecting means that deflects the laser beam, and a polygon mirror, and by driving the deflecting means and the polygon mirror. Based on a scanning means for two-dimensionally scanning the laser beam with the eye to be inspected, a light receiving element for receiving the reflected light of the laser beam scanned by the eye to be inspected, and a light receiving signal of the light receiving element. The identification means is provided with an image processing means for generating a photographed image of the eye to be inspected, and an identification means for identifying a reflecting surface to which the laser beam is applied among a plurality of reflecting surfaces formed on the polygon mirror. The means has a rotation reference detecting means for detecting a rotation reference that serves as a reference for one round of the polygon mirror, and at least the detection result by the rotation reference detecting means is used to identify the reflecting surface to which the laser beam is applied. The image processing means is characterized in that the captured image corrected based on the identification result of the identification means is generated.

According to the present disclosure, a good photographed image can be obtained.

It is a figure which showed the optical system of the scanning type ophthalmologic imaging apparatus of this Example. It is the schematic which showed the arrangement relation of the reflection surface identification part and the polygon mirror from above. It is a block diagram which showed the control system of the scanning ophthalmologic imaging apparatus in this Example. It is a figure which shows the example of the photographed image of the model eye with a wire. It is a figure which shows the example which enlarged a part of the photographed image of the model eye with a wire. This is an example of constructing a captured image by the image processing unit. It is a figure which shows an example of the photographed image after correction.

<Example>
Examples of the present disclosure will be described with reference to the drawings. As shown in FIG. 1, the scanning ophthalmologic imaging apparatus 1 of this embodiment (hereinafter abbreviated as the present apparatus 1) includes, for example, a light projecting optical system 10, a light receiving optical system 20, and a reflecting surface identification unit 30. Be prepared.

The projection optical system 10 scans the laser beam two-dimensionally on the fundus of the eye to be inspected. The light projecting optical system 10 includes a light source 11, a dichroic mirror 12, light sources 13a to 13c, half mirrors 14a to 14c, a perforated mirror 15, a lens 16, mirrors 17, 18 and concave mirrors 19, 111. , 113, a polygon mirror 110, and a galvano mirror 112.

The light source 11 emits a laser beam. The light source 11 of this embodiment is a semiconductor laser that emits a laser beam in the near infrared region (for example, λ = 790 nm). Further, the light sources 13a to 13c shown in FIG. 1 emit light in the visible range. In this embodiment, the light source 13a is a semiconductor laser light source that emits a red (wavelength about 670 nm) laser light, the light source 13b is a semiconductor laser light source that emits a green (wavelength about 530 nm) laser light, and the light source 13c is blue (wavelength about 490 nm). Each of the semiconductor laser light sources that emit the laser light of the above is used. That is, in this embodiment, the laser light emitted from the near-infrared light source 11 and the visible light sources 13a to 13c is used as the laser light for fundus photography. The dichroic mirror 12 is arranged between the light source 11 and the perforated mirror 15, and has a characteristic of reflecting a laser beam having a wavelength in the visible region and transmitting a laser beam having a wavelength in the near infrared region.

The perforated mirror 15 has an opening in the center. The mirrors 17 and 18 are movable in the direction of the arrow shown in FIG. 1, and focusing (diopter correction) can be performed by changing the optical path length. The polygon mirror 110 serves as a scanning means for scanning the laser beam in the horizontal direction on the fundus of the eye to be inspected. The galvano mirror 112 serves as a deflecting means for deflecting the laser beam in a direction perpendicular to the scanning direction of the polygon mirror 110. The deflection means is not limited to the galvanometer mirror, and various optical members may be used.

The concave mirrors 19, 111, 113, the galvano mirror 112, the polygon mirror 110, the mirrors 17, 18, the lens 16, and the perforated mirror 15 are also used as the light receiving optical system 20, which will be described later.

The laser light emitted from the light source 11 passes through the dichroic mirror 12, passes through the opening of the perforated mirror 15, passes through the lens 16, and is reflected by the mirror 17, the mirror 18, and the concave mirror 19 to be reflected by the polygon mirror. Head to 110. The light flux reflected by the polygon mirror 110 is reflected by the concave mirror 111, the galvano mirror 112, and the concave mirror 113, and then collected by the fundus of the eye E to be examined, and the fundus is two-dimensionally (the XY axis shown). Scan (in the direction).

Further, the luminous flux (red light) emitted from the light source 13a is reflected by the half mirror 14a and then further reflected by the dichroic mirror 12 and guided to the optical path of the projection optical system 10. The luminous flux guided to the optical path of the projection optical system 10 is applied to the fundus of the eye E to be inspected through the same path as the above-mentioned infrared laser beam for illumination. Further, the luminous flux (green light) emitted from the light source 13b is reflected by the half mirror 14b, then passes through the half mirror 14a, and is guided to the optical path of the light projecting optical system 10 by the dichroic mirror 12. Further, the luminous flux (blue light) emitted from the light source 13c is reflected by the half mirror 14c, then transmitted through the half mirror 14b and the half mirror 14a, and is guided to the optical path of the projection optical system 10 by the dichroic mirror 12.

<Receiving optical system>
The light receiving optical system 20 receives the reflected light of the laser light reflected by the fundus of the eye to be inspected. The light receiving optical system 20 includes a part of the light projecting optical system 10 (from the concave mirror 113 to the perforated mirror 15), a lens 21, a pinhole plate 22, a condenser lens 23, and a light receiving element 24. The pinhole plate 22 has a pinhole on the optical axis. The pinhole plate 22 is arranged at a position conjugate with the observation point (imaging point) of the fundus. The light receiving element 24 has sensitivity in the infrared region and the visible region.

The reflected light of the laser beam scanned on the fundus of the eye to be inspected traces the above-mentioned projection optical system 10 in the reverse direction and is reflected by the perforated mirror 15. The pupil position of the eye to be inspected and the opening of the perforated mirror 15 are conjugated by the lens 16 and the concave mirrors 19, 111, and 113. The reflected light reflected by the perforated mirror 15 focuses on the pinhole of the pinhole plate 22 via the lens 21. The reflected light focused by the pinhole passes through the condenser lens 23 and then is received by the light receiving element 24.

Even if a cut filter having a characteristic of cutting light in a wavelength band other than the photographing laser light projected on the eye to be inspected and the photographing laser light reflected by the eye to be inspected is provided immediately before the light receiving element 24. Good.

<Reflective surface identification unit>
The reflection surface identification unit 30 identifies the reflection surface to which the laser beam is applied from among the plurality of reflection surfaces of the polygon mirror 110. The reflection surface identification unit 30 is composed of, for example, a reflection surface detection unit 31, a rotation reference detection unit 32, and a control unit 90 described later. The reflection surface detection unit 31 detects, for example, the timing at which each reflection surface has a predetermined angle and is arranged at the scanning start position of the laser beam. The rotation reference detection unit 32 detects, for example, the reference position when the polygon mirror 110 makes one revolution.

The reflection surface detection unit 31 includes, for example, a light source 311 (for example, a light emitting diode) and a sensor 312. The light source 311 is arranged so as to irradiate the same reflecting surface (including the starting end) as the reflecting surface (mirror surface) of the laser light in the polygon mirror 110 when the laser light for fundus photography is emitted. .. The sensor 312 receives (detects) the light from the light source 311 reflected by the reflecting surface of the polygon mirror 110.

The light source 311 and the sensor 312 are vertically divided and arranged with the rotating surface of the polygon mirror 110 as a boundary (see FIG. 1), and are placed outside the scanning range of the laser beam. Based on the detection signal of the laser beam by the sensor 312, the drive control of the galvanometer mirror 112 and the formation of the captured image are performed.

Further, in this embodiment, two light receiving elements used for the sensor 312 are provided in parallel in the rotation direction of the polygon mirror 110 (light receiving elements 312a and 312b), and the light from the light source 311 is detected at different timings. (See FIG. 2). In this case, the waveforms of the light receiving signals output from each light receiving element are the same, but the output timings are different. Therefore, when the waveforms of the light receiving signals output from each light receiving element intersect (the outputs become equal), a synchronization signal is obtained based on this.

In FIG. 2, the range H1 indicated by the thin line indicates the range in which the photographing laser light reflected by the reflecting surface M1 due to the rotation of the polygon mirror 110 is scanned. The range H2 indicated by the alternate long and short dash line indicates the reference range of the scanning range H1 that is imaged as a captured image. Further, the arrow K in the drawing indicates the rotation direction of the polygon mirror 110. In this embodiment, when the laser beam for photographing scanned by the polygon mirror 110 reaches the scanning start position of the scanning range H1, the light emitted from the light source 311 is reflected by the surface. The light source 311 and the sensor 312 are installed so as to be reflected on the same surface (including the start end) as the above and incident on the sensor 312. For example, a light source such that the diode light reflected by the surface immediately before the surface on which the laser light is reflected is incident on the sensor 312 when the end of the surface (the beginning of the laser reflecting surface) is irradiated. 311 and sensor 312 are installed.

The rotation reference detection unit 32 includes a light source 321 (for example, a light emitting diode) and a sensor 322. As shown in FIG. 1, the light source 321 and the sensor 322 are provided so as to face each other with the polygon mirror 110 in the direction of the rotation axis of the polygon mirror 110. As shown in FIG. 2, the polygon mirror 110 is provided with an opening 323, and when the opening 323 is rotated to a position between the light source 321 and the sensor 322, the light of the light source 321 passes through the opening 323. Then, the light is received by the sensor 322. As a result, the position of the opening 323 of the polygon mirror 110 is detected. The opening 323 of the polygon mirror 110 is used as a rotation reference. That is, the position where the light of the light source 321 is detected by the sensor 322 serves as a rotation reference, and it is detected that the polygon mirror 110 makes one round.

A cut filter that cuts light in a wavelength band other than the light emitted from the light source 311 or the light source 321 may be provided immediately before the sensor 312 of the reflection surface detection unit 31 and the sensor 322 of the rotation reference detection unit 32. .. In this case, the cut filter transmits the light emitted from the light source 311, the light source 321 and blocks the photographing laser light projected on the eye to be examined and the photographing laser light reflected by the eye to be examined. The wavelength band to be transmitted is set. In the case of fluorescence photography, the laser light for photography reflected from the eye to be examined changes with respect to the wavelength when the light is projected onto the eye to be examined and returns. Therefore, in addition to the wavelength used by the laser light source for photography, It is preferable to provide a cut filter that can also cut the wavelength band of fluorescence excited by the eye to be examined during fluorescence imaging.

FIG. 3 is a block diagram showing a control system of the present device 1. The control unit 90 controls the entire device. The control unit 90 receives light from the light source 11, the polygon mirror 110, the galvano mirror 112, the light receiving element 24, the light sources 13a to 13c, the drive unit 91 for driving the mirrors 17 and 18, the operation unit 92, and the light receiving element 24. An image processing unit 93 for forming an image of the fundus of the eye to be inspected based on the signal, light sources 311, 321 and sensors 312, 322 and the like are connected. The display unit 94 displays the image formed by the image processing unit 93. The storage unit 95 stores various information. The storage unit 95 stores the number of reflective surfaces (mirrors) of the polygon mirror used, the number of image lines for constructing an image, and correction data (described later) for correcting the image.

The control unit 90 identifies the reflection surface to which the laser beam is applied based on the detection results of the reflection surface detection unit 31 and the rotation reference detection unit 32. For example, the control unit 90 counts the number of times each reflective surface is arranged at the scanning start position by the reflective surface detecting unit 31 after the rotation reference detecting unit 32 detects that the polygon mirror 110 has reached the rotation reference. This makes it possible to identify the number of the reflecting surface from the rotation reference. For example, when the control unit 90 receives the first received signal from the sensor 312 after receiving the received signal from the sensor 322, the control unit 90 determines that the laser light is reflected by the reflecting surface M1, and similarly, from the sensor 322. When the second, third, ..., Nth light receiving signals are received from the sensor 312 after receiving the light receiving signal, the laser beam is reflected by the reflecting surfaces M2, M3, ..., Mn, respectively. judge.

<Acquisition of correction data>
Subsequently, a method of acquiring correction data for correcting an image will be described. The correction data is data for correcting image distortion caused by a manufacturing error of the polygon mirror 110. The correction data is set for each reflecting surface of the polygon mirror 110, for example. The correction data is created, for example, in the adjustment mode for calibrating the device, based on the correction image taken by the device 1 of a known pattern. In the case of this embodiment, the present device 1 creates correction data based on a photographed image of a model eye in which wires are provided in a grid pattern. The correction data may be automatically created by the control unit 90, or may be manually created by the input of the user (coordinator).

When the model eye is photographed, as shown in FIG. 4, an image in which the wire is wavy is photographed due to the influence of the manufacturing error of the polygon mirror 110. Therefore, the control unit 90 detects the position of the wire by image processing and acquires a pixel shift in the horizontal direction (main scanning direction or X direction) between the scanning lines (image lines). Since the reflective surface of the polygon mirror 110 corresponding to each scanning line of the image can be identified based on the detection results of the reflective surface detecting unit 31 and the rotation reference detecting unit 32, the control unit 90 corresponds to the pixel deviation of each scanning line. The corrected amount is stored in the storage unit 95 as correction data for each reflective surface.

For example, in FIG. 5, the control unit 90 scans the scanning lines A2 and A4 by 1 pixel to the left, the scanning lines A3 by 2 pixels to the left, and the scanning lines A6 and A8 by 1 pixel to the right with respect to the scanning line A1. It is detected that the line A7 is shifted to the right by 2 pixels, and that the scanning line A5 is not shifted. Further, the control unit 90 scans the scanning line A1 as the reflecting surface M3, the scanning line A2 as the reflecting surface M4, and the scanning line A3 as the reflecting surface M5, based on the detection results of the reflecting surface detecting unit 31 and the rotation reference detecting unit 32. It can be identified that the line A4 is the reflection surface M6, the scanning line A5 is the reflection surface M7, the scanning line A6 is the reflection surface M8, the scanning line A7 is the reflection surface M1, and the scanning line A8 is the image acquired by the reflection of the reflection surface M2. .. In this case, for example, the control unit 90 sets the correction amount of the reflecting surfaces M3 and M7 to ± 0 pixels, the correction amount of the reflecting surfaces M4 and M6 to -1 pixel, the correction amount of the reflecting surface M5 to -2 pixels, and the reflecting surface M2. , The correction amount of M8 is +1 pixel, and the correction amount of the reflecting surface M1 is +2 pixels, and the storage unit 95 stores the correction amount. In this way, the correction amount for each reflective surface is stored in the storage unit 95 in advance as correction data before the imaging of the eye to be inspected.

<Control operation>
The operation of the device 1 having the above configuration will be described.

The examiner measures the refractive power of the eye to be inspected in advance with an eye refractive power measuring device or the like, and inputs the obtained refractive power value of the eye to be inspected by using the refractive power input unit of the operation unit 92. The control unit 90 stores the input refractive power data in the storage unit 95, and drives the mirrors 17 and 18 using the drive unit 91 to correct the diopter. With the diopter corrected, the examiner moves the device 1 using a joystick or the like (not shown) so that the fundus of the eye E to be inspected is irradiated with laser light and a desired image is displayed on the display unit 94. Alignment is performed. Further, the examiner sets the imaging conditions by using the laser light selection unit 92a for selecting the laser light to be used and the laser output adjustment unit 92b for adjusting the output of the laser light, which are arranged in the operation unit 92. .. Here, the laser beam irradiating the fundus is used as near-infrared light from the light source 11.

The laser beam emitted from the light source 11 is reflected by the polygon mirror 110 rotating at a constant speed and scanned in the horizontal direction. Here, when the laser beam horizontally scanned by the polygon mirror 110 reaches the scanning range H2, the light emitted from the light source 311 is received by the sensor 312. Then, the received signal from the sensor 312 is sent to the control unit 90. The control unit 90 can detect that the laser beam for photographing has reached the scanning start position on the fundus in the horizontal direction based on the received signal from the sensor 312.

Further, when the polygon mirror 110 is rotated to the rotation reference, the light emitted from the light source 321 passes through the opening 323 and is received by the sensor 322. Then, the received signal from the sensor 322 is sent to the control unit 90. The control unit 90 can detect that the polygon mirror 110 has reached the rotation reference based on the received signal from the sensor 322. Further, the control unit 90 identifies which reflection surface of the polygon mirror 110 the laser beam hits, based on the light receiving signal from the sensor 322 and the light receiving signal from the sensor 312 input before and after the light receiving signal.

The laser beam scanned by the polygon mirror 110 is further scanned in the vertical direction (from top to bottom) by driving the galvano mirror 112. The near-infrared laser light reflected by the galvanometer 112 is focused on the fundus and scanned two-dimensionally. Then, the reflected light of the laser beam focused on the fundus is received by the light receiving element 24 via the light receiving optical system 20. The control unit 90 controls the drive of the galvano mirror 112 with respect to the polygon mirror 110 and the image formation by the image processing unit 93 based on the received signals from the sensor 312 and the sensor 322.

More specifically, the control unit 90 sets the laser beam after a lapse of a predetermined time from the time when the light of the light source 311 is received by the sensor 312 in the scanning range H1 of the laser beam based on the rotation of the polygon mirror 110 shown in FIG. The predetermined scanning range according to the above is defined as the reference scanning range H2 used for photographing. The control unit 90 uses the scanning range H2 as a reference to display the light receiving signal of the light receiving element 24 in the scanning range H3 (shaded portion in FIG. 6) shifted by the correction amount of the correction data stored in the storage unit 95. Control to send to.

For example, in the case of FIG. 6, the control unit 90 identifies that the scanning line A1 corresponds to the reflection surface M5 based on the detection results of the reflection surface detection unit 31 and the rotation reference detection unit 32. Therefore, the control unit 90 sends a light receiving signal in the scanning range (imaging range) H3 deviated from the scanning range H2 by -2 pixels, which is the correction amount of the reflecting surface M5, to the image processing unit 93. When the polygon mirror 110 further rotates and the laser light is reflected by the next reflection surface M6, the laser light is received by the sensor 312 in the same manner as described above. Upon receiving the detection signal from the sensor 312, the control unit 90 sends a light receiving signal in the scanning range H3 deviated from the scanning range H2 by -1 pixel, which is the correction amount of the next reflecting surface M6, to the image processing unit 93. As shown in FIG. 7, the image processing unit 93 arranges the acquired image line data for one column in a row one step below the previously acquired image line data for one column.

Similarly, after the scanning line A3, the control unit 90 sends the received signal of the scanning range H3 deviated from the scanning range H2 by the correction amount of each reflecting surface stored in the storage unit 95 to the image processing unit 93. The image processing unit 93 sequentially arranges the light receiving signals from the light receiving element 24 acquired in the scanning range H3 as image data (see FIG. 7) and displays them on the display unit 94.

Further, the control unit 90 sequentially counts the received light signals obtained by the sensor 312, and counts the received light signals for the number of image lines for constructing an image for one frame stored in advance in the storage unit 95. When the above is obtained, the galvano mirror 112 is returned to the reflection angle at the start of scanning, and the drive control is performed so that the laser beam is scanned from top to bottom in the same manner again according to the switching of the reflection surface.

As described above, the scanning ophthalmologic imaging apparatus 1 of the present embodiment is provided with the reflection surface identification unit 30 to identify the reflection surface reflecting the laser beam among the plurality of reflection surfaces of the polygon mirror 110. Can be done. As a result, by creating correction data for each reflecting surface from the correction image taken in advance before taking the image of the eye to be inspected, it is possible to form an image suitable for each reflecting surface. Therefore, a good image can be obtained even if the formation angle between the mirrors of the polygon mirror is different due to manufacturing error or the like.

The rotation reference detection unit 32 detects the rotation reference by detecting the opening 323 formed in the polygon mirror 110, but the configuration is not limited to this. For example, the rotation reference detection unit 32 may detect that the polygon mirror 110 has reached the rotation reference when the protrusion provided on the polygon mirror 110 blocks the optical path between the light source 321 and the sensor 322. Further, the rotation reference detection unit 32 may photograph a mark provided on the polygon mirror 110 and detect that the polygon mirror 110 has reached the rotation reference when the mark is rotated to a predetermined position. The openings, protrusions, marks, etc. may be provided not only on the upper surface and the lower surface of the polygon mirror 110 but also on the side surfaces.

In the above embodiment, the control unit 90 corrects the image by shifting the image by the correction amount (pixels) set for each reflecting surface, but the timing for starting the exposure of the light receiving element 24 is set for each reflecting surface. The image may be corrected by adjusting. For example, the control unit 90 moves the timing from the acquisition of the detection signal of the reflection surface detection unit 31 to the start of the exposure of the light receiving element 24 back and forth based on the correction amount (time) set for each reflection surface. Then, the range to be imaged may be corrected.

The scanning interval in the sub-scanning direction (Y direction) may shift depending on the manufacturing error of the polygon mirror 110. In this case, for example, the control unit 90 detects the position of the wire extending in the scanning direction (X direction) from the captured image of the model eye with a wire, and the distance between the detected wires, the width of the wire, the shading of the image, and the like are uniform. The deflection angle of the galvano mirror 112 (voltage applied to the galvano mirror 112) may be stored in the storage unit 95 for each reflection surface of the polygon mirror 110 so as to be. In this case, the control unit 90 identifies the reflection surface to which the laser beam is applied based on the detection results of the reflection surface detection unit 31 and the rotation reference detection unit 32, and the galvano mirror 112 has a deflection angle set for each reflection surface. To drive. As a result, the control unit 90 can acquire an image in which the deviation of the scanning interval in the sub-scanning direction due to the manufacturing error of the polygon mirror 110 is suppressed.

The scanning ophthalmologic imaging device is not limited to a device that photographs the fundus, but is also applicable to an apparatus that photographs the anterior segment of the eye to be inspected.

1 Scanning ophthalmic imaging device 11 Laser light source 110 Polygon mirror 112 Galvano mirror 311 Light source 312 Sensor 321 Light source 322 Sensor 22 Pin pole plate 24 Light receiving element 93 Image processing unit 94 Display unit 95 Storage unit

Claims (5)

A scanning ophthalmic imaging device that photographs the eye to be inspected.
A shooting light source that emits laser light and
A scanning means having a deflecting means for deflecting the laser beam and a polygon mirror, and driving the deflecting means and the polygon mirror to scan the laser beam two-dimensionally with the eye to be inspected.
A light receiving element that receives the reflected light of the laser beam scanned by the eye to be inspected, and a light receiving element.
An image processing means that generates a captured image of the eye to be inspected based on a light receiving signal of the light receiving element, and
Among the plurality of reflecting surfaces formed on the polygon mirror, an identification means for identifying the reflecting surface to which the laser beam is applied is provided.
The identification means has a rotation reference detecting means for detecting a rotation reference which is a reference for one round of the polygon mirror, and uses at least the detection result by the rotation reference detecting means to determine a reflecting surface to which the laser beam is applied. Identify and
The image processing means is a scanning ophthalmologic imaging apparatus, characterized in that it generates the captured image corrected based on the identification result of the identification means. The identification means includes a reflecting surface detecting means for detecting that the reflecting surface exposed to the laser beam is arranged at a predetermined angle, and the rotation reference detecting means detects that the polygon mirror has reached the rotation reference. The scanning ophthalmologic imaging apparatus according to claim 1, wherein the reflecting surface to which the laser beam is applied is identified based on the number of detection signals acquired by the reflecting surface detecting means. The image processing means reads out the correction data related to the reflecting surface identified by the identifying means from the correction data stored in the storage unit for each reflecting surface, and corrects the captured image based on the read-out correction data. The scanning ophthalmologic imaging apparatus according to claim 1 or 2. The scanning ophthalmologic imaging apparatus according to claim 3, wherein the correction data is data for matching the imaging range of the scanning range of the laser beam in the main scanning direction on each reflecting surface. A control means for controlling the scanning means is further provided.
The scanning ophthalmologic imaging apparatus according to any one of claims 1 to 4, wherein the control means adjusts the deflection angle of the deflection means based on the identification result of the identification means.