Compound eye fundus camera

Abstract

The application provides a compound eye fundus camera with a large shooting area and low cost. The compound eye fundus camera comprises a light path system, the light path system comprises a plurality of image acquisition units and a compound eye lens, the plurality of image acquisition units correspond to one area of a fundus respectively, the compound eye lens has a plurality of lens units, and each image acquisition unit is opposite to one lens unit; each image acquisition unit comprises a camera module and an illumination module; the camera module is arranged between the corresponding lens unit and the illumination module; the compound eye fundus camera further comprises a controller; the controller is further used for opening the camera modules of the image acquisition units one by one; when any camera module is used for acquiring an image, only the illumination modules of the specific one or more other image acquisition units corresponding to the camera module are turned on; and each part of the fundus photographed by the camera module is spliced into a complete fundus picture.

Description

[0001] This application is a divisional application of the invention patent application number CN2017104463523 filed on June 14, 2017. Technical Field

[0002] This invention pertains to ophthalmic devices, and specifically relates to a compound eye fundus camera. Background Technology

[0003] Fundus cameras are commonly used equipment in ophthalmology to observe the fundus and determine if there are any lesions. Traditional fundus cameras use a camera to acquire an image of the entire fundus. Due to the curvature of the fundus and the presence of reflections, an optical path system consisting of one or more aspherical mirrors must be used. Aspherical mirrors are expensive, resulting in high equipment costs, and the shooting angle is limited, with a small imaging area. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a compound eye fundus camera that has a large imaging area and low cost.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A compound eye fundus camera includes an optical path system, characterized in that the optical path system includes a plurality of image acquisition units and a compound eye lens disposed in front of the plurality of image acquisition units, the plurality of image acquisition units respectively correspond to a region of the fundus, and the compound eye lens has a plurality of lens units, with each of the image acquisition units facing one of the lens units;

[0007] Each of the image acquisition units includes:

[0008] The camera module is used to acquire fundus images of the corresponding area.

[0009] An illumination module is used to provide illumination to the camera modules of the other image acquisition units;

[0010] The camera module is located between the corresponding lens unit and the illumination module;

[0011] The compound eye fundus camera also includes a controller for controlling the camera module of one of the image acquisition systems to capture images according to a set sequence and controlling the illumination of the illumination modules of other image acquisition systems; the controller is also used to turn on the camera module of each image acquisition unit one by one, and when any camera module is capturing an image, only the illumination modules of one or more other image acquisition units corresponding to it are turned on, and the images of various parts of the fundus captured by the camera module are stitched together to form a complete fundus image.

[0012] Preferably, the camera module of each image acquisition unit has a geometric center, and the geometric center of the camera module of each image acquisition unit lies in a first plane.

[0013] Preferably, the illumination module of each image acquisition unit has a geometric center, and the geometric center of the illumination module of each image acquisition unit lies in a second plane, which is parallel to the first plane.

[0014] Preferably, the geometric centers of the camera modules of the plurality of image acquisition units are distributed at equal intervals on the first plane.

[0015] Preferably, each of the lens units is a spherical mirror.

[0016] Preferably, the camera module includes a CMOS module.

[0017] Preferably, the number of image acquisition units is 2 to 12.

[0018] Preferably, the optical path system consists of the plurality of image acquisition units and the compound eye lens.

[0019] Preferably, the camera module of each image acquisition unit corresponds to the illumination module of one or more other image acquisition units, and the illumination modules of other image acquisition units are turned on and off in sequence to adjust the illumination modules of the one or more other image acquisition units corresponding to each camera module to avoid reflection when the camera module acquires images.

[0020] The present invention adopts the above technical solution and has the following advantages compared with the prior art:

[0021] Each image acquisition unit corresponds to a fundus region. Setting up multiple image acquisition units can increase the shooting area and the shooting angle. Moreover, since a camera module is also set at the periphery of the fundus, there is no need to set up aspherical lens correction, which simplifies the optical path and reduces equipment costs. Attached Figure Description

[0022] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a side view of a compound eye fundus camera according to the present invention;

[0024] Figure 2 This is a schematic diagram of multiple image acquisition units of the present invention.

[0025] Among them, 1 is an image acquisition unit; 11 is a camera module; 12 is an illumination module; and 2 is a compound eye lens. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] This embodiment provides a compound eye fundus camera, which is used in the diagnosis of ophthalmic diseases for observing the fundus.

[0028] This compound eye fundus camera has an optical path system, see attached... Figure 1 As shown, the optical path system includes multiple image acquisition units 1 and a compound eye lens 2 positioned in front of the multiple image acquisition units 1. The directional term "in front" as used herein refers to the eye as the reference point, with the side closest to the eye considered "in front." Each of the multiple image acquisition units 1 corresponds to a region of the fundus; theoretically, the fundus regions corresponding to the multiple image acquisition units 1 should cover the entire fundus. The compound eye lens 2 has multiple lens units, with each image acquisition unit 1 directly opposite one of the lens units. The multiple lens units are connected together or integrated to form a single compound eye lens 2. The multiple image acquisition units 1 are also connected sequentially.

[0029] See attached document Figure 1 and 2 As shown, each of the image acquisition units 1 includes:

[0030] Camera module 11 is used to acquire fundus images of the corresponding area;

[0031] The illumination module 12 is used to provide illumination to the camera modules 11 of the other image acquisition units 1;

[0032] The camera module 11 is located between the corresponding lens unit and the illumination module 12.

[0033] Each of the image acquisition units 1 has a camera module 11 with a geometric center, and the geometric centers of the camera modules 11 of each image acquisition unit 1 lie in a first plane; each of the image acquisition units 1 has an illumination module 12 with a geometric center, and the geometric centers of the illumination modules 12 of each image acquisition unit 1 lie in a second plane, which is parallel to the first plane. That is, the geometric centers of all camera modules 11 are coplanar, and the geometric centers of all illumination modules 12 are coplanar.

[0034] The present invention also provides a special image acquisition unit, wherein the geometric center of the camera module 11 of each image acquisition unit 1 is located within a first sphere and on the same side of the center of the sphere; the geometric center of the illumination module 12 of each image acquisition unit 1 is located within a second sphere and on the same side of the center of the sphere, wherein the center of the second sphere coincides with the center of the first sphere and is adapted to the shape of the eyeball. The first and second spheres can also be replaced by two parallel curved surfaces, as long as these two curved surfaces are parallel to the surface of the eyeball.

[0035] The geometric centers of the camera modules 11 of the plurality of image acquisition units 1 are distributed at equal intervals on the first plane or the first sphere; the geometric centers of the illumination modules 12 of the plurality of image acquisition units 1 are distributed at equal intervals on the second plane or the second sphere. In other words, each camera module 11 is uniformly distributed, and each illumination module 12 is also uniformly distributed.

[0036] The camera module 11 is specifically a CMOS module, and the illumination module 12 includes a light source, such as an LED light. Each lens unit is an aspherical mirror, and the compound eye lens 2 is composed of multiple aspherical mirrors connected together. The price of aspherical mirrors is much lower than that of spherical mirrors.

[0037] The number of image acquisition units 1 is 2 to 12.

[0038] The optical path of the compound eye fundus camera consists only of the multiple image acquisition units 1 and the compound eye lens 2, and there is no need to set up an aspherical lens to correct the peripheral part of the fundus.

[0039] The compound eye fundus camera also includes a controller, which is electrically connected to the camera module 11 and illumination module 12 of each image acquisition system, respectively, and is used to control the camera module 11 of one image acquisition system to take pictures and control the illumination module 12 of the other image acquisition systems to illuminate according to a set sequence.

[0040] Each camera module 11 of the image acquisition unit 1 corresponds to one or more illumination modules 12 of other image acquisition units 1. That is, each camera module 11 corresponds to a set of illumination modules 12 arranged in a specific manner at different positions. Only when this specific set of illumination modules 12 is turned on to provide illumination can the reflection of the eyeball be avoided, and only then can the camera module 11 capture a clear, reflection-free image. This is the core reason why in this invention, inexpensive and readily available spherical lenses can be used instead of expensive aspherical lenses. This is because the correspondence between the specific illumination modules 12 and the camera modules 11 eliminates reflection, so it is not necessary to use aspherical lenses to filter out reflection; a compound eye lens composed of spherical lenses is sufficient.

[0041] In this invention, the illumination module 12 of the aforementioned specific one or more other image acquisition units corresponding to each camera module 11 is determined through controller debugging (for ease of description, it is simply referred to as a specific set of illumination modules). The controller specifically includes a chip, which is used to implement the debugging. The controller is also used to turn on the camera modules of each image acquisition unit one by one, and to turn on and off the illumination modules of other image acquisition units in sequence to debug the illumination modules of the specific one or more other image acquisition units corresponding to each camera module to avoid reflection when the camera module is acquiring images; when any camera module is acquiring images, only the illumination module of the specific one or more other image acquisition units corresponding to it is turned on.

[0042] In use, the compound eye fundus lens is placed in front of the eye, with the compound eye lens 2 closest to the eyeball. Following a pre-set sequence, it sequentially selects one of the CMOS modules to capture images, while only the corresponding specific set of illumination modules 12 is turned on to illuminate that CMOS module. In this way, an image of one part of the fundus is captured each time. Finally, all the captured images are stitched together using software algorithms to form a complete fundus image.

[0043] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and they should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A compound eye fundus camera, comprising an optical path system, characterized in that, The optical path system includes multiple image acquisition units and a compound eye lens disposed in front of the multiple image acquisition units. The multiple image acquisition units each correspond to a region of the fundus. The compound eye lens has multiple lens units, with each image acquisition unit facing one of the lens units. Each of the lens units is a spherical mirror. Each of the image acquisition units includes: The camera module is used to acquire fundus images of the corresponding area. An illumination module is used to provide illumination to the camera modules of the other image acquisition units; The camera module is located between the corresponding lens unit and the illumination module; The compound eye fundus camera also includes a controller for controlling the camera module of one of the image acquisition systems to capture images according to a set sequence and controlling the illumination of the illumination modules of other image acquisition systems; the controller is also used to turn on the camera module of each image acquisition unit one by one, and when any camera module is capturing an image, only the illumination modules of one or more other image acquisition units corresponding to it are turned on, and the images of various parts of the fundus captured by the camera module are stitched together to form a complete fundus image.

2. The compound eye fundus camera according to claim 1, characterized in that: Each of the image acquisition units has a camera module with a geometric center, and the geometric center of the camera module of each image acquisition unit lies in a first plane.

3. The compound eye fundus camera according to claim 2, characterized in that: The illumination module of each image acquisition unit has a geometric center, which lies in a second plane parallel to the first plane.

4. The compound eye fundus camera according to claim 2, characterized in that: The geometric centers of the camera modules of the multiple image acquisition units are equally spaced on the first plane.

5. The compound eye fundus camera according to claim 1, characterized in that: The camera module includes a CMOS module.

6. The compound eye fundus camera according to claim 1, characterized in that: The number of image acquisition units is 2 to 12.

7. The compound eye fundus camera according to claim 1, characterized in that: The optical path system consists of the plurality of image acquisition units and the compound eye lens.

8. The compound eye fundus camera according to claim 1, characterized in that: Each camera module of an image acquisition unit corresponds to a specific lighting module of one or more other image acquisition units, and the lighting modules of other image acquisition units are turned on and off in sequence to adjust the lighting modules of the specific one or more other image acquisition units corresponding to each camera module to avoid reflection when the camera module acquires images.

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