CN111044261B - Method, device, storage medium and system for detecting illumination uniformity of eye fundus camera - Google Patents
Method, device, storage medium and system for detecting illumination uniformity of eye fundus camera Download PDFInfo
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- CN111044261B CN111044261B CN201911402359.0A CN201911402359A CN111044261B CN 111044261 B CN111044261 B CN 111044261B CN 201911402359 A CN201911402359 A CN 201911402359A CN 111044261 B CN111044261 B CN 111044261B
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Abstract
The invention discloses a fundus camera illumination uniformity detection method, a fundus camera illumination uniformity detection device, a fundus camera illumination uniformity detection storage medium and a fundus camera illumination uniformity detection system. The method for detecting the illumination uniformity of the fundus camera comprises the following steps: acquiring a detection image shot by a fundus camera in real time, wherein the detection image is a shot image of the fundus camera when the fundus camera shoots a uniform light surface; acquiring a gray value of a detection image; and judging the uniformity of the illumination light source according to the gray value of the detected image. In the technical scheme of the invention, the reflected light of the light homogenizing surface can really restore the energy distribution of the illumination light source; the gray value of the detected image can truly reflect the energy distribution of the reflected light of the dodging surface, and further truly reflect the energy distribution of the illumination light source. Therefore, the brightness distribution condition of the illumination light source can be obtained by reading the gray value of the detection image, whether the brightness distribution of the illumination light source meets the illumination uniformity requirement is further judged, and the adjusting device is guided to carry out related debugging operation or the user is guided to debug the illumination light source of the fundus camera according to the judgment result.
Description
Technical Field
The invention relates to the technical field of photoelectric imaging, in particular to a method, a device, a storage medium and a system for detecting the illumination uniformity of an eye fundus camera.
Background
The fundus camera is used as an ophthalmologic examination instrument, a shot picture is clear and bright, and no obvious dark or over-exposed area exists in the picture, however, the illumination of many fundus cameras is not uniform enough, and particularly for instruments with large visual field angles, the illumination brightness of all positions of the fundus is inconsistent most easily, and the imaging quality is poor.
The existing fundus camera is designed without considering the need of adjusting illumination brightness, and uneven illumination brightness distribution actually influences the imaging quality of the fundus camera and restricts the further development of images shot by the fundus camera.
Disclosure of Invention
The invention mainly aims to provide a fundus camera illumination uniformity detection method, and aims to solve the problem that the conventional fundus camera cannot detect illumination brightness distribution.
In order to achieve the above object, the present invention provides a method for detecting illumination uniformity of a fundus camera, comprising the following steps:
acquiring a detection image shot by a fundus camera in real time, wherein the detection image is a shot image of the fundus camera when the fundus camera shoots a uniform light surface;
acquiring a gray value of the detection image;
and judging the uniformity of the illumination light source according to the gray value of the detection image.
Optionally, the step of acquiring the gray-scale value of the detection image includes:
setting a plurality of acquisition regions on the detection image, wherein each acquisition region comprises the same number of pixels;
and respectively reading the gray value of each acquisition zone bit.
Optionally, the step of determining the uniformity of the illumination light source according to the gray-scale value of the detection image includes:
setting the difference delta between the maximum value and the minimum value of the gray values of all the acquisition regions on the detection image, and comparing the delta with a preset value;
and if delta is less than or equal to a preset value, judging the illumination light to be uniform light.
Optionally, the step of setting a plurality of collecting locations on the detection image includes;
superposing a reference line on the detection image;
and arranging a plurality of acquisition regions on the reference line.
Optionally, the step of superimposing a reference line on the detection image includes:
superposing a reference ring on the detection image, wherein the center of the reference ring is superposed with the center of the detection image;
and a plurality of acquisition regions are arranged on the reference circular ring at intervals.
Optionally, the gray value of the collection zone bit is an average value of the gray values of all pixels in the collection zone bit.
The invention also provides a fundus camera illumination uniformity detection device, which comprises a memory, a processor and fundus camera illumination uniformity detection software stored on the memory and capable of running on the processor, wherein the fundus camera illumination uniformity detection software is configured to realize the steps of the fundus camera illumination uniformity detection method.
The invention also provides a storage medium, wherein the storage medium stores fundus camera illumination uniformity detection software, and the fundus camera illumination uniformity detection software is operated to realize the fundus camera illumination uniformity detection method.
The invention also provides a system for detecting the illumination uniformity of the fundus camera, which comprises:
the light homogenizing plate is provided with a light homogenizing surface;
the eye fundus camera comprises an eye objective, an illumination light source, an illumination light path, an imaging light path and an image collector, the eye objective is arranged towards the light homogenizing surface, the illumination light source is used for emitting illumination light, the illumination light is transmitted to the eye objective through the illumination light path and is emitted to the light homogenizing surface from the eye objective, the light homogenizing surface is transmitted to the image collector through the imaging light path based on reflected light generated by the illumination light, and the image collector receives the reflected light and forms the detection image; and
a fundus camera illumination uniformity detection device electrically connected with the image collector, the fundus camera illumination uniformity detection device being the fundus camera illumination uniformity detection device of claim 7;
and the adjusting device is electrically connected with the fundus camera illumination uniformity detection device and the fundus camera illumination light source and is used for adjusting the illumination light source according to the uniformity of the illumination light source detected by the fundus camera illumination uniformity detection device.
Optionally, the illumination light is vertically irradiated to the light homogenizing surface; and/or the presence of a gas in the gas,
the light homogenizing plate comprises paper, plastic or cardboard.
In the technical scheme of the invention, illumination light emitted by an illumination light source of the fundus camera is projected on a light homogenizing surface, the light homogenizing surface is based on reflected light generated by the illumination light, and the reflected light on the light homogenizing surface can really restore energy distribution of the illumination light source; the fundus camera image collector collects reflected light generated by the dodging surface and converts the reflected light into a detection image, and the gray value of the detection image can truly reflect the energy distribution of the reflected light of the dodging surface, so that the energy distribution of the illumination light source is truly reflected. Therefore, the brightness distribution condition of the illumination light source can be obtained by reading the gray value of the detection image, whether the brightness distribution of the illumination light source meets the illumination uniformity requirement is further judged, and the adjusting device is guided to carry out related debugging operation or the user is guided to debug the illumination light source of the fundus camera according to the judgment result.
Compared with the traditional fundus camera, the invention has obvious advantages that 1) the illumination distribution rationality of the fundus camera is improved; the traditional fundus camera is not provided with an illumination uniformity detection device, the distribution condition of light energy of illumination light on an illuminated surface is difficult to find, and the condition that the light energy at certain edge positions is too strong easily occurs; 2) the shooting quality of the fundus camera image is improved; compared with the traditional fundus camera, the shot image is caused by the unsatisfactory illumination distribution condition, and the illumination distribution can be adjusted as required after the illumination uniformity detection software is used, so that the shot image can achieve the best effect; 3) the consistency of the images of the fundus camera is ensured; the traditional images shot by the fundus camera are not corrected in illumination, so that the images shot for multiple times are different due to illumination influence, and the consistency of imaging is ensured after the images are detected and adjusted by the illumination uniformity detection device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of an embodiment of a fundus camera illumination uniformity detection system provided by the present invention;
FIG. 2 is a flowchart of an embodiment of a fundus camera illumination uniformity detection method provided by the present invention;
fig. 3 is a detection image of an embodiment of the fundus camera illumination uniformity detection method provided by the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Because the light source adopted by the fundus camera is generally a halogen lamp or an LED lamp, the light energy distribution of the fundus camera is basically lambertian radiation, the central brightness is higher, and the edge brightness is lower. If the bulb is assembled in a wrong way, or the bulb is not installed in an unreasonable position, or the brightest part of the bulb is not in the central position, the phenomenon of uneven illumination can be caused. The existing fundus camera is designed without considering that the illumination brightness needs to be adjusted, however, the uneven illumination effect causes that an obvious dark or overexposed area exists on a shot fundus picture, and the imaging quality of the fundus camera is influenced. In view of the above, the invention provides a fundus camera illumination uniformity detection method, device, storage medium and system, and aims to detect the illumination brightness distribution of a fundus camera and further guide the adjustment of the illumination light source of the fundus camera, so that the illumination of the fundus camera is more uniform and the imaging effect is better.
Referring to fig. 1, fig. 1 is a view illustrating a system for detecting illumination uniformity of a fundus camera according to an embodiment of the present invention, including a light homogenizing plate, a fundus camera, a device for detecting illumination uniformity of the fundus camera, and an adjusting device. The light homogenizing plate is used for providing a light homogenizing surface. The fundus camera comprises an illumination light source, an illumination light path, an imaging light path, an image collector and an eye objective, the eye objective of the fundus camera faces towards the light homogenizing surface, the illumination light source is used for emitting illumination light, the illumination light is transmitted to the eye objective through the illumination light path and is emitted to the light homogenizing surface from the eye objective, the reflected light generated by the light homogenizing surface based on the illumination light is transmitted to the image collector through the imaging light path, and the image collector receives the reflected light and forms a detection image. The eye fundus camera illumination uniformity detection device is electrically connected with an image collector of the eye fundus camera to acquire a detection image shot by the eye fundus camera in real time, acquire a gray value on the detection image and judge the uniformity of the illumination light source according to the gray value of the detection image. The adjusting device is electrically connected with the fundus camera illumination uniformity detection device and the illumination light source of the fundus camera and used for adjusting the illumination light source according to the uniformity of the illumination light source detected by the fundus camera illumination uniformity detection device.
In the technical scheme of the invention, illumination light emitted by an illumination light source of the fundus camera is projected on a light homogenizing surface, the light homogenizing surface is based on reflected light generated by the illumination light, and the reflected light on the light homogenizing surface can really restore light energy distribution of the illumination light source; the image collector collects reflected light generated by the dodging surface and converts the reflected light into a detection image, and the gray value of the detection image can truly reflect the energy distribution of the reflected light of the dodging surface, so that the energy distribution of the illumination light source is truly reflected. Therefore, the light energy distribution condition of the illumination light source, namely the brightness distribution condition, can be obtained by reading the gray value of the detection image, so as to judge whether the brightness distribution of the illumination light source meets the illumination uniformity requirement, and guide the adjusting device to carry out related debugging operation or guide a user to debug the illumination light source of the fundus camera according to the judgment result.
In the present invention, the material of the light uniformizing plate is not limited as long as the light uniformizing plate can provide a light uniformizing surface for diffuse reflection. The light homogenizing plate can be paper, plastic or cardboard, and the surface of the light homogenizing plate is uniform and free of impurities so as to avoid interfering with light reflection.
It should be noted that, the angle of the illumination light projected to the light homogenizing surface is not limited, and the illumination light is preferentially irradiated to the light homogenizing surface vertically, so that the reflected light of the light homogenizing surface can reflect the brightness distribution of the illumination light source most accurately.
The invention provides a fundus camera light source detection device which comprises a memory, a processor and fundus camera illumination uniformity detection software, wherein the fundus camera illumination uniformity detection software is stored in the memory and can run on the processor. The fundus camera illumination uniformity detection software stored in the memory is called by the processor to execute a fundus illumination uniformity detection method as described below.
The invention also provides a storage medium, and the storage medium stores the illumination uniformity detection software of the fundus camera. The fundus camera illumination uniformity detection software is run to implement a fundus camera illumination detection method as described below.
Based on the hardware structure and the software, the embodiment of the invention also provides a method for detecting the illumination uniformity of the fundus camera. Referring to fig. 2, fig. 2 is a schematic flow chart of a fundus camera illumination uniformity detection method according to an embodiment of the present invention, the fundus camera illumination uniformity detection method includes the following steps:
s100: acquiring a detection image shot by a fundus camera in real time, wherein the detection image is a shot image of the fundus camera when the fundus camera shoots a uniform light surface;
s200: acquiring a gray value of the detection image;
s300: and judging the uniformity of the illumination light source according to the gray value of the detection image.
Specifically, after the fundus camera operates, the illumination light source is set to be in a normally bright mode, illumination light emitted by the illumination light source is transmitted to the eye objective lens through the illumination light path and is emitted to the light homogenizing surface through the eye objective lens, the light homogenizing surface generates reflected light based on the illumination light, the reflected light generated by the light homogenizing surface is collected by the imaging light path and is transmitted to the image collector, and the image collector receives the reflected light and forms a detection image on the image collector.
The light homogenizing surface is a diffuse reflection surface, and the diffuse reflection surface can reflect the projection light to all directions with the same brightness, so that the energy distribution of the projection light source can be really restored by the reflected light captured from any direction. The reflected light generated by the dodging surface is collected by the imaging light path and is conducted to the image collector, the image collector can convert the optical image into an electric signal image, and the full appearance of the image is directly displayed, namely, the detection image formed on the image collector can really restore the energy distribution of the reflected light generated by the dodging surface, and further the energy distribution of the illumination light source is really restored.
The gray value is used for displaying the brightness difference of pixels in a black-and-white image, and when the light energy collected by a certain pixel is more, the pixel has high brightness and large gray value; when light energy collected by a certain pixel is less, the pixel has low brightness and small gray value. Therefore, the energy distribution of the collected reflected light can be reflected by reading the size of the gray value on the detection image, and the energy distribution of the illumination light source can be further reflected. The gray value of the corresponding position on the detected image is large at the place with high energy of the illumination light source, and the gray value of the corresponding position on the detected image is small at the place with low energy of the illumination light source.
And after the energy distribution condition of the illumination light source is obtained through the gray value, further judging whether the energy distribution of the illumination light source meets the requirement of illumination uniformity, and guiding an adjusting device to carry out related debugging operation or guiding a user to debug the illumination light source of the fundus camera according to the judgment result. According to the technical scheme, the illumination distribution condition of the fundus camera is detected, and the illumination light source of the fundus phase is guided to be adjusted, so that the illumination distribution rationality of the fundus camera is improved, the image shooting quality of the fundus camera is improved, and the consistency of multiple image shooting of the fundus camera is ensured.
To determine whether the energy distribution of the illumination light source satisfies the illumination uniformity requirement, in an embodiment, the step of obtaining the gray-level value of the detection image includes:
s210: setting a plurality of acquisition regions on the detection image, wherein each acquisition region comprises the same number of pixels;
s220: and respectively reading the gray value of each acquisition zone bit.
Each pixel on the detection image comprises a gray value, and the premise that the gray values read by the designated acquisition regions are compared is as follows: each appointed acquisition zone bit comprises the same number of pixels so as to avoid the influence of the number of the pixels on the accuracy and the reliability of the gray value of the acquisition zone bit.
It should be noted that the shape of the collection region and the size of the collection region (i.e. the number of pixels included) are not limited, the collection region may be circular, rectangular or other shapes, and the number of pixels included in the collection region may be tens or hundreds. The user can set up the size of gathering the position as required, when the user mainly judges the bulk luminance of light source, can set up and gather the position and contain more pixel, and its result can reflect the bulk luminance of light source more. When a user mainly judges whether the illumination light source is uniform light, more acquisition regions can be set, and each acquisition region contains fewer pixel points, so that the uniformity of the illumination light source can be reflected more accurately.
It should be further noted that the calculation method of the gray scale value of the collection region is not limited, and in an embodiment, the gray scale value of the collection region is an average value of the gray scale values of all pixels in the collection region. The calculation mode is less influenced by the size of the acquisition zone (namely the number of the contained pixels), and the result consistency is better when the gray value is judged for multiple times to meet the illumination light brightness distribution requirement. Of course, the gray value of the collection area can also be the sum of the gray values of all pixels in the collection area.
In addition, when the acquisition zone bit is set on the detection image, the acquisition zone bit can be appointed after the detection image is acquired, such as: after the detection image is acquired, a user can appoint a collection zone bit on the detection image according to the own requirements, the operation is flexible, the position and the number of the collection zone bit can be adjusted at any time according to the detection image, and the requirements of the user are better met. The fundus camera illumination detection device reads the gray value of the pixel after acquiring the pixel coordinate of the collection area designated by the user. The acquisition location can also be specified before the detection image is acquired, such as: a plurality of acquisition region location distribution schemes can be preset, one acquisition region location distribution scheme is appointed before a detection image is acquired, and after the detection image is acquired, the fundus camera illumination uniformity detection software automatically reads the gray value of each acquisition region location in the appointed acquisition region location distribution scheme.
The step of judging the uniformity of the illumination light source according to the gray value of the detection image comprises the following steps:
s310: setting the difference delta between the maximum value and the minimum value of the gray values of all the acquisition regions on the detection image, and comparing the delta with a preset value;
s320: if delta is smaller than or equal to a preset value, the illumination light is judged to be uniform light.
Specifically, a plurality of acquisition regions are arranged on the detection image, and the positions of the designated acquisition regions are preferably uniformly distributed on the detection image. Setting the difference between the maximum value and the minimum value of the gray values of all the acquisition regions on the detected image as delta, and judging the illumination light to be uniform light when the delta is less than or equal to a preset value. On the contrary, when δ is larger than the preset value, it is determined that the illumination light is not uniform light. For example, the preset value is set to 0, that is, when the gray values read by all the acquisition regions on the detected image are the same, it can be determined that the illumination light is uniform light, the energy distribution at each position of the illumination light source is the same, and the brightness at each position of the illumination light is the same. On the contrary, if the gray value of one collecting area is different from the gray values of other collecting areas, if the gray value of one collecting area is smaller than the gray values of the other collecting areas, the delta is larger than the preset value, the illumination light is judged to be not uniform light, the light energy of the illumination light source in the collecting area is small, the illumination light brightness is low, and a local too-dark area can appear on the imaging image to influence the imaging effect.
In practice, the energy of the uniform illumination light may not be identical everywhere, and thus the gradation value of each pixel on the detection image formed by the uniform illumination light may not be identical. Therefore, when determining whether the illumination light is uniform light, the preset value is generally greater than 0, and the user can set the size of the preset value according to the use requirements and experience. Such as: if the preset value is 20, when determining whether a certain illumination light source is uniform light, acquiring a detection image obtained based on the illumination light source, and then setting 12 acquisition regions on the detection image, wherein the gray values of the acquisition regions are 147, 124, 120, 118, 134, 137, 142, 139, 131, 130, 145 and 139 respectively, and the difference between the maximum gray value and the minimum gray value is δ 147 and 118 is 29 > 20, it indicates that the illumination light source is not uniform light, and the brightness of the illumination light source at the gray value of 118 is dark. After the illumination is adjusted, acquiring a new detection image in real time, reading the gray values of the 12 acquisition regions again, and if the difference between the maximum value and the minimum value of the read gray values is less than 20, if the gray values are respectively as follows: 136. 125, 123, 121, 133, 134, 140, 139, 135, 128, 140, 136, and the difference δ between the maximum gray scale value and the minimum gray scale value is 140 and 121 is 19 < 20, the adjusted illumination light is uniform light.
In addition, after the illumination light is judged to be uniform, whether the illumination light brightness meets the requirements of users can be further judged, and the method comprises the following steps: and (3) calculating the mean value ā of the gray values of all the acquisition regions, judging whether ā is in a preset gray value range, and if so, ensuring that the illumination light brightness meets the requirements of users. Specifically, assume that: the preset gray value range is as follows: the mean value of the gray values of the detected images is larger than 140, and when the mean value ā of the gray values of the acquired multiple acquisition regions on the detected images is larger than or equal to 140, for example, is 143, the brightness of the illumination light source is judged to meet the requirements of users; when the mean gray value ā of the acquired gray values of the multiple collecting areas on the detected image is less than 140, for example, 126, it is determined that the brightness of the illumination light source does not meet the user requirement, and the brightness of the illumination light source is less than the brightness required by the user, so that the brightness of the illumination light source needs to be improved.
In order to facilitate the uniform arrangement of a plurality of acquisition regions on the detection image, in one embodiment, the step of arranging a plurality of acquisition regions on the detection image comprises;
s211: superposing a reference line on the detection image;
s212: and a plurality of acquisition regions are arranged on the reference line.
Specifically, the present invention does not limit the specific form of the reference lines, the reference lines may be grid lines formed by interweaving the horizontal lines and the vertical lines, and the reference lines may also be circular, rectangular or other shapes.
In one embodiment, the step of superimposing a reference line on the detection image includes:
s213: superposing a reference ring on the detection image, wherein the center of the reference ring is superposed with the center of the detection image;
s214: a plurality of acquisition regions are arranged on the reference circular ring at intervals.
Because the image of fundus imaging is generally a circular image, the reference ring is better matched with the detection image, and the observation is convenient. Specifically, referring to fig. 3, 3 reference rings are stacked on the detection image, the 3 reference rings are concentrically arranged, the center of each reference ring coincides with the center of the detection image, and 8 acquisition regions, which are 24 acquisition regions in total, are uniformly arranged on each reference ring. If the illumination light is uniform, the gray values of the 24 acquisition regions should be the same, or the difference δ between the maximum value and the minimum value of the gray values of the 24 acquisition regions is smaller than a preset value. Through setting up the reference line, be convenient for on the one hand evenly set up the collection position on detecting the image to make the judged result more accurate, on the other hand appoints the same collection position when judging at every turn, can guarantee that the judged result does not receive the influence of gathering the position of position many times, and the judged result is more accurate.
It should be noted that the reference line in the present embodiment may also be used to determine whether the illumination light source corresponds to lambertian radiation. The central brightness of the illumination light source which accords with the Lambert radiation is higher, the edge brightness is lower, and the central area brightness is higher, the gray value is larger, the edge area brightness is lower, and the gray value is smaller on the detection image. During detection, whether the illumination light on each reference ring is uniform light is firstly judged, and if the gray values of 8 acquisition regions on each reference ring are the same or the difference between the maximum value and the minimum value is smaller than a preset value, the illumination light on each reference ring is judged to be uniform; and further calculating the mean value of the gray values of 8 acquisition regions on each reference ring to respectively obtain the mean value of the gray values on the three reference rings, and when the mean values of the gray values on the three reference rings are gradually reduced from the center to the edge, judging that the illumination light source accords with Lambert radiation. When the illumination light on each reference ring is not uniform light, or the mean gray value values on the three reference rings are not distributed in a gradually decreasing manner from the center to the edge, the illumination light source is judged not to conform to lambertian radiation.
It should be noted that the number of the reference rings is not limited, and may be one or multiple, and the user may set the reference rings according to the requirement.
In addition, in an embodiment, the step of reading the gray scale value of each of the collection regions further includes:
s221: and displaying the gray value of each acquisition zone bit.
Specifically, after the gray value of the collected region on the detection image is read, the gray value can be directly displayed. After the user visually sees the gray value, the user can automatically judge whether the illumination light source meets the requirements of the user according to the gray value.
In addition, after the gray values of all the acquisition regions are displayed, the gray values can be identified.
In particular, the user may identify gray values that do not meet their requirements, such as may highlight the value or change the color of the value. In an embodiment, when determining whether the gray values of the plurality of collecting regions conform to the uniform light, a user may identify the gray values that do not conform to the uniform light, for example, identify a bright spot on the minimum gray value, and focus on the gray values of the collecting regions after adjusting the illumination light source. Alternatively, the software automatically identifies the gray scale values that affect the uniform light of the illumination light to alert the user to focus.
Further, the step of determining the uniformity of the illumination light source according to the gray-scale value of the detected image further includes: according to the determination result, an adjustment instruction for adjusting the fundus camera illumination light source is generated.
Specifically, the adjustment instruction may be a prompt command to display "up adjust illumination light source luminance", "down adjust illumination light source luminance", "adjust left side illumination light source luminance", or the like on the fundus camera illumination detection apparatus. And regulating and controlling the brightness of the illumination light source by a user according to the regulating instruction, acquiring the detection image of the regulated illumination light source by the image collector, and judging according to the detection image until the gray value meets the illumination light brightness distribution requirement.
The fundus camera illumination uniformity detection system also comprises an adjusting device, the adjusting device is electrically connected with the fundus camera illumination uniformity detection device and the fundus camera illumination light source, and the adjusting device receives an adjusting instruction sent by the fundus camera illumination uniformity detection device and adjusts the illumination light source.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.
Claims (6)
1. A fundus camera illumination uniformity detection method is characterized by comprising the following steps:
acquiring a detection image shot by a fundus camera in real time, wherein the detection image is a shot image of the fundus camera when the fundus camera shoots a uniform light surface;
acquiring a gray value of the detection image;
judging the uniformity of the illumination light source according to the gray value of the detection image;
adjusting the illumination light source according to the judgment result;
the step of acquiring the gray value of the detection image comprises the following steps:
setting a plurality of acquisition regions on the detection image, wherein each acquisition region comprises the same number of pixels,
respectively reading the gray value of each acquisition zone bit;
the step of setting a plurality of acquisition regions on the detection image comprises;
superposing a plurality of reference lines on the detection image,
a plurality of acquisition regions are arranged on the reference line;
the step of judging the uniformity of the illumination light source according to the gray value of the detection image comprises the following steps:
setting the difference delta between the maximum value and the minimum value of the gray values of all the acquisition regions on the detection image, and comparing the delta with a preset value;
if delta is smaller than or equal to a preset value, judging the illumination light to be uniform light;
the step of superimposing a plurality of reference lines on the detection image includes:
superposing a reference ring on the detection image, wherein the center of the reference ring is superposed with the center of the detection image;
a plurality of acquisition regions are arranged on the reference circular ring at intervals;
after the uniformity of the illumination light source is judged, whether the illumination light brightness meets the requirements of users is further judged;
after the gray values of the acquisition regions are respectively read in the step, the acquisition regions with inconsistent gray values are identified.
2. The fundus camera illumination uniformity detection method of claim 1, wherein the gray scale value of the acquisition zone bit is an average of the gray scale values of all pixels within the acquisition zone bit.
3. A fundus camera illumination uniformity detection apparatus comprising a memory, a processor and fundus camera illumination uniformity detection software stored on said memory and executable on said processor, said fundus camera illumination uniformity detection software being configured to implement the steps of the fundus camera illumination uniformity detection method of any one of claims 1 to 2.
4. A storage medium having stored therein fundus camera illumination uniformity detection software which when executed implements a fundus camera illumination uniformity detection method according to claim 1 or 2.
5. A fundus camera illumination uniformity detection system, comprising:
the light homogenizing plate is provided with a light homogenizing surface;
the eye fundus camera comprises an eye objective lens, an illumination light source, an illumination light path, an imaging light path and an image collector, wherein the eye objective lens is arranged towards the light homogenizing surface, the illumination light source is used for emitting illumination light, the illumination light is transmitted to the eye objective lens through the illumination light path and is emitted to the light homogenizing surface from the eye objective lens, the reflected light generated by the light homogenizing surface based on the illumination light is transmitted to the image collector through the imaging light path, and the image collector receives the reflected light and forms the detection image;
a fundus camera illumination uniformity detection device electrically connected with the image collector, the fundus camera illumination uniformity detection device being the fundus camera illumination uniformity detection device of claim 3; and
and the adjusting device is electrically connected with the fundus camera illumination uniformity detection device and the fundus camera illumination light source and is used for adjusting the illumination light source according to the uniformity of the illumination light source detected by the fundus camera illumination uniformity detection device.
6. The fundus camera illumination uniformity detection system of claim 5, wherein said illumination light is perpendicularly irradiated to said light homogenizing surface; and/or the presence of a gas in the atmosphere,
the light homogenizing plate comprises paper, plastic or cardboard.
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