Electronic endoscope imaging quality detection device and method

Abstract

The present invention relates to the field of image detection technology, and specifically to an electronic endoscope imaging quality detection device and method, comprising a box, a grayscale block optical fiber interface, a grayscale block light source and a light guide tube, wherein the end of the grayscale block optical fiber interface is fixedly connected to the grayscale block light source, a hollow tube is fixedly installed inside the box, one end of the hollow tube is fixedly installed with the light guide tube, and a lampshade is axially movable at the other end of the hollow tube, the grayscale block optical fiber interface is installed at the end of the lampshade away from the light guide tube, and the cross-sectional area of ​​the lampshade gradually decreases in the direction from the light guide tube to the grayscale block optical fiber interface, a light absorption tube is fixedly installed on the same axis as the grayscale block light source in the hollow tube, and a first light guide plate is fixedly installed at the end of the light guide tube close to the hollow tube.

Description

Technical Field

[0001] The present invention relates to the technical field of image detection, and in particular to an electronic endoscope imaging quality detection device and method. Background Art

[0002] At present, the imaging quality detection device of electronic endoscopes uses two integrating spheres of different sizes. Half of the larger integrating sphere is used as background light source uniform light, and the light outlet of the smaller integrating sphere is used as grayscale block uniform light. The two integrating spheres are respectively connected to medical cold light sources through manual apertures, and the internal brightness is adjusted through the aperture. During the detection, the front end of the smaller integrating sphere is fixed to the device under test, and the aperture is adjusted to control the brightness. After stabilization, the imaging brightness meter is used to measure the current brightness and record it. Then the detection personnel operate the acquisition card software to take a picture of the light outlet of the small integrating sphere. According to the corresponding relationship between the brightness of different objects and the picture, the fit between the brightness and the grayscale value of the picture, the signal-to-noise ratio, the spatial frequency response, and the static image tolerance results are calculated. However, when the existing detection device measures devices with different imaging qualities, it is necessary to replace the corresponding grayscale test card, and then calibrate the grayscale test card before measuring, which makes the measurement time-consuming and laborious.

[0003] For this purpose, the patent with publication number CN117606749B proposes a detection device and method, which uses a grayscale block light source to emit a light beam to an adjustment component, so that the adjustment component adjusts the light entrance aperture size of the grayscale block light source to the required size according to the use requirements, and then emits it into the integrating sphere through the second light entrance port, so that the light beam of the grayscale block light source remains uniform and then emits it out of the second light exit port, and passes through the box body from the external light hole, thereby simulating grayscale test cards with different test brightness, which is used to detect devices with different imaging qualities;

[0004] However, when adjusting the size of the light entrance aperture, the light-through holes with different apertures on the baffle overlap with the central axis of the through hole, thereby adjusting the amount of light emitted by the grayscale block reaching the second light entrance, thereby simulating grayscale test cards with different test brightness;

[0005] However, the above structure has the following problems: first, the length of the baffle determines the number of light-through holes, and the number of light-through holes determines the number of grayscale test cards simulating different test brightnesses, and the number of simulations is limited; second, it is necessary to use large components such as motors, screws, guide rods, sliders, baffles, etc., resulting in an overall large occupied area; third, the brightness between two adjacent grayscale test cards simulating brightness cannot be selected.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0007] The purpose of the present invention is to redesign the components of the simulated grayscale test card on the basis of the existing technology so that it is not only small in overall size, but also can simulate a large number of grayscale test cards, and the brightness between two adjacent simulated brightness grayscale test cards can also be simulated to provide an electronic endoscope imaging quality detection device and method to solve the above-mentioned deficiencies in the technology.

[0008] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electronic endoscope imaging quality detection device, comprising a housing, a grayscale block optical fiber interface, a grayscale block light source and a light guide tube, wherein the end of the grayscale block optical fiber interface is fixedly connected to the grayscale block light source, a hollow tube is fixedly installed inside the housing, one end of the hollow tube is fixedly installed with the light guide tube, and a lampshade is axially movable at the other end of the hollow tube, the grayscale block optical fiber interface is installed at the end of the lampshade away from the light guide tube, and the cross-sectional area of ​​the lampshade gradually decreases in the direction from the light guide tube to the grayscale block optical fiber interface, a light absorbing tube on the same axis as the grayscale block light source is fixedly installed inside the hollow tube, and a first light guide plate is fixedly installed at the end of the light guide tube close to the hollow tube;

[0009] The grayscale block light source is driven close to the light absorbing tube through the lampshade, so that the amount of light emitted by the grayscale block light source entering the light absorbing tube gradually increases, and the light entering the first light guide plate gradually decreases, thereby adjusting the amount of light entering the light guide tube to simulate grayscale test cards with different test brightness.

[0010] Preferably, the lampshade includes a hollow ring threadedly connected to the inner circumference of the hollow tube, a hollow cone fixedly connected to the end of the hollow ring, and a mounting tube fixedly installed at the end of the hollow cone, and the grayscale block optical fiber interface is installed in the mounting tube.

[0011] Preferably, an annular groove is provided inside the installation tube, and a limiting convex ring cooperating with the annular groove is installed outside the grayscale block optical fiber interface.

[0012] Preferably, the inner circumferential surface of the light absorbing tube is coated with light absorbing black paint, and the cross-sectional area of ​​the light absorbing tube is larger than the cross-sectional area of ​​the grayscale block light source.

[0013] Preferably, a positioning frame is fixedly installed in the hollow tube, a plurality of light-through holes distributed in a ring array are penetrated in the positioning frame, and the light-absorbing tube is fixedly connected to one side of the positioning frame.

[0014] Preferably, the outer circumference of the light absorbing tube, the inner circumference of the hollow ring, the outer surface of the positioning frame, and the inner surface of the hollow truncated cone are all mirror-plated.

[0015] Preferably, a receiving groove is provided in the positioning frame, the receiving groove is communicated with the interior of the light absorbing tube, a second light guide plate is placed in the receiving groove, and the outer circumferential surface of the second light guide plate is on the same circumferential surface as the outer circumferential surface of the hollow tube.

[0016] Preferably, when the hollow tube is fixedly mounted on the box, the second light guide plate is located on a side of the box close to the grayscale block optical fiber interface.

[0017] In a second aspect, the present invention further provides a method for operating the electronic endoscope imaging quality detection device, comprising the following steps:

[0018] S1. Install the object to be tested, and connect the object to be tested and the light box to a host computer, and then set the test information of the object to be tested, as well as the incident light brightness preset value and the background brightness preset value of the light box through the host computer;

[0019] S2, the host computer adjusts the test brightness of the light box according to the test information of the object under test, and the preset value of the incident light brightness and the preset value of the background brightness of the light box;

[0020] S3, setting sampling points of the object to be measured, wherein the sampling points are distributed between the dark area cut-off brightness and the saturation brightness of the light box;

[0021] S4. The host computer captures at least 8 image acquisition screens of the object under test at each sampling point according to the sampling points of the object under test, and then inputs the test distance and Gamma correction value of the object under test into the host computer, and calculates the brightness response characteristics, signal-to-noise ratio and static image tolerance of the object under test according to the relationship between the grayscale value in the image acquisition screen captured by the host computer and the brightness of the outgoing light hole.

[0022] Preferably, in S2, the method for adjusting the brightness of incident light output by the grayscale block light source to the light guide tube in the step of adjusting the test brightness of the light box includes: driving the lampshade to make the light absorbing tube close to or away from the grayscale block light source, thereby reducing or increasing the brightness of incident light received by the light guide tube.

[0023] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0024] By improving the components of the simulated grayscale test card in the prior art, the present invention realizes the simulated grayscale test card while reducing the overall volume, thereby optimizing the product structure;

[0025] The present invention can adjust the distance between the light absorbing tube and the grayscale block light source by rotating the mounting tube, thereby adjusting the brightness of the incident light entering the light guide tube, thereby simulating grayscale test cards of different brightnesses, and only needs to control the number of rotations of the mounting tube. Compared with the light entrance holes with multiple fixed apertures in the prior art, not only the number of simulations is increased, but also the brightness between two grayscale test cards in the prior art can be simulated by fine-tuning the mounting tube;

[0026] The present invention enables the second light guide plate to reversely reflect the brightness simulated by the grayscale test card through the design of the light absorption tube and the mounting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the separation of the hollow tube and the second light guide plate of the present invention;

[0030] Figure 3 It is a schematic diagram of the internal structure of the hollow tube of the present invention;

[0031] Figure 4 It is a schematic diagram of the connection between the hollow tube and the second light guide plate of the present invention;

[0032] Figure 5 It is a schematic diagram of the first irradiation of the light absorbing tube and the gray scale block light source of the present invention;

[0033] Figure 6 It is a schematic diagram of the second illumination of the light absorbing tube and the gray scale block light source of the present invention;

[0034] Figure 7 It is a third illumination schematic diagram of the light absorbing tube and the gray scale block light source of the present invention.

[0035] Description of reference numerals:

[0036] 1. Box body; 2. Gray scale block optical fiber interface; 3. Gray scale block light source; 4. Light guide tube; 5. Hollow tube; 6. Lampshade; 6a. Hollow ring; 6b. Hollow cone; 6c. Mounting tube; 7. Light absorbing tube; 8. First light guide plate; 9. Annular groove; 10. Limiting convex ring; 11. Positioning frame; 12. Light through hole; 13. Receiving groove; 14. Second light guide plate. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] The present invention provides Figure 1-4 An electronic endoscope imaging quality detection device shown in the figure includes a box body 1, a grayscale block optical fiber interface 2, a grayscale block light source 3 and a light guide tube 4, the end of the grayscale block optical fiber interface 2 is fixedly connected to the grayscale block light source 3, a hollow tube 5 is fixedly installed inside the box body 1, one end of the hollow tube 5 is fixedly installed to the light guide tube 4, and the other end of the hollow tube 5 has a lampshade 6 axially movable, the lampshade 6 includes a hollow ring 6a threadedly connected to the inner circumference of the hollow tube 5, a hollow truncated cone 6b fixedly connected to the end of the hollow ring 6a, and a mounting tube 6c fixedly installed at the end of the hollow truncated cone 6b, the grayscale block optical fiber interface 2 is installed in the mounting tube 6c, and the cross-sectional area of ​​the hollow truncated cone 6b gradually decreases from the light guide tube 4 to the grayscale block optical fiber interface 2, a first light guide plate 8 is fixedly installed at one end of the light guide tube 4 close to the hollow tube 5, a positioning frame 11 is fixedly installed in the hollow tube 5, and the positioning frame 11 penetrates There are a plurality of light holes 12 distributed in a circular array, a light absorbing tube 7 is fixedly connected to the side of the positioning frame 11 close to the grayscale block light source 3, the inner circumference of the light absorbing tube 7 is coated with light absorbing black paint, the cross-sectional area of ​​the light absorbing tube 7 is larger than the cross-sectional area of ​​the grayscale block light source 3, a receiving groove 13 is provided in the positioning frame 11, the receiving groove 13 is communicated with the inside of the light absorbing tube 7, a second light guide plate 14 is placed in the receiving groove 13, the outer circumference of the second light guide plate 14 and the outer circumference of the hollow tube 5 are on the same circumferential surface, the outer circumference of the light absorbing tube 7, the inner circumference of the hollow ring 6a, the outer surface of the positioning frame 11, and the inner surface of the hollow frustum 6b are all electroplated with mirror surfaces, when the hollow tube 5 is fixedly installed on the box body 1, the second light guide plate 14 is located on the side of the box body 1 close to the grayscale block optical fiber interface 2, the mounting tube 6c has an annular groove 9, and a limiting convex ring 10 matching the annular groove 9 is installed outside the grayscale block optical fiber interface 2;

[0040] The present invention only improves the partial structure and operation method of the patent with publication number CN117606749B regarding "the grayscale block light source 3 emits a light beam to the adjustment component, so that the adjustment component adjusts the light incident aperture size of the grayscale block light source 3 to a required size according to the use requirements, and then emits the light beam into the integrating sphere through the second light incident port", and the remaining structures and use methods are the same;

[0041] When simulating a grayscale test card with different test brightness, since the outer circumference of the light absorbing tube 7, the inner circumference of the hollow ring 6a, the outer surface of the positioning frame 11, and the inner surface of the hollow truncated cone 6b are all electroplated with mirrors, the light emitted by the grayscale block light source 3, except for the light entering the light absorbing tube 7, the rest of the light will pass through the light hole 12 on the positioning frame 11 and enter the first light guide plate 8, and then the first light guide plate 8 will emit the incident light to the light guide tube 4 in the form of a surface light source;

[0042] When adjusting the brightness of the incident light incident on the first light guide plate 8, the operator drives the hollow truncated cone 6b and the hollow ring 6a to rotate by rotating the mounting tube 6c. Since the hollow ring 6a is threadedly connected to the inner circumference of the hollow tube 5, the hollow truncated cone 6b and the grayscale block light source 3 are driven to approach the light absorbing tube 7. Figure 5 Figure 6 Figure 7 As shown, because the cross-sectional area of ​​the light absorbing tube 7 is larger than the cross-sectional area of ​​the grayscale block light source 3, and the inner circumference of the light absorbing tube 7 is coated with light-absorbing black paint, as the light absorbing tube 7 gradually approaches the grayscale block light source 3, the amount of light emitted by the light absorbing tube 7 entering the light absorbing tube 7 increases, which results in a decrease in the brightness of the incident light irradiated to the first light guide plate 8. Therefore, the operator can control the brightness of the first light guide plate 8 by rotating the number of circles of the mounting tube 6c, thereby simulating grayscale test cards of different brightnesses. Compared with the existing technology with a small number of simulated brightness, a limited number of simulations, a large product volume, and limited simulation accuracy, the present structure can adjust the number of simulations according to the number of circles and angles of the mounting tube 6c, with a large number of simulations, and a compact volume of the entire product structure, and the simulation accuracy is improved;

[0043] At the same time, after the light enters the light absorbing tube 7, it will irradiate the second light guide plate 14, and the second light guide plate 14 will emit light. Since the second light guide plate 14 is located on the side of the box 1 close to the grayscale block optical fiber interface 2, the operator can directly see the light outside the box 1. Figure 5 Figure 6 Figure 7 As shown, the closer to the grayscale block light source 3, the more incident light the second light guide plate 14 receives, and the brighter it is. Therefore, it can be used as a reference to reversely explain that the first light guide plate 8 receives less incident light;

[0044] The present invention also provides an electronic endoscope imaging quality detection method, which uses the above-mentioned electronic endoscope imaging quality detection device to test the imaging quality of the object to be tested, comprising the following steps:

[0045] S1. Install the object to be tested, and connect the object to be tested and the light box to a host computer, and then set the test information of the object to be tested, as well as the incident light brightness preset value and the background brightness preset value of the light box through the host computer;

[0046] S2, the host computer adjusts the test brightness of the light box according to the test information of the object under test, and the preset value of the incident light brightness and the preset value of the background brightness of the light box;

[0047] S3, setting sampling points of the object to be measured, wherein the sampling points are distributed between the dark area cut-off brightness and the saturation brightness of the light box;

[0048] S4, the host computer intercepts at least 8 image acquisition screens of the object under test at each sampling point according to the sampling points of the object under test, then inputs the test distance and Gamma correction value of the object under test into the host computer, and calculates the brightness response characteristics, signal-to-noise ratio and static image latitude of the object under test according to the relationship between the grayscale value in the image acquisition screen intercepted by the host computer and the brightness of the outgoing light hole;

[0049] In S2, the method for adjusting the brightness of the incident light output by the grayscale block light source 3 to the light guide tube 4 in the step of adjusting the test brightness of the light box includes: driving the lampshade 6 to make the light absorbing tube 7 approach or move away from the grayscale block light source 3, thereby reducing or increasing the brightness of the incident light received by the light guide tube 4.

[0050] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are exemplary only. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application.

Claims

1. An electronic endoscope imaging quality detection device, comprising a housing (1), a grayscale block optical fiber interface (2), a grayscale block light source (3) and a light guide (4), characterized in that: The end of the grayscale block optical fiber interface (2) is fixedly connected to the grayscale block light source (3); a hollow tube (5) is fixedly installed inside the housing (1); one end of the hollow tube (5) is fixedly installed with the light guide tube (4); a lampshade (6) is axially movable at the other end of the hollow tube (5); the grayscale block optical fiber interface (2) is installed at the end of the lampshade (6) away from the light guide tube (4); the cross-sectional area of ​​the lampshade (6) gradually decreases in the direction from the light guide tube (4) to the grayscale block optical fiber interface (2); a light absorbing tube (7) on the same axis as the grayscale block light source (3) is fixedly installed inside the hollow tube (5); and a first light guide plate (8) is fixedly installed at the end of the light guide tube (4) close to the hollow tube (5); The grayscale block light source (3) is driven to approach the light absorbing tube (7) through the lampshade (6), so that the amount of light emitted by the grayscale block light source (3) entering the light absorbing tube (7) gradually increases, and the amount of light entering the first light guide plate (8) gradually decreases, thereby adjusting the amount of light entering the light guide tube (4) to simulate grayscale test cards with different test brightness.

2. The electronic endoscope imaging quality detection device according to claim 1, characterized in that: The lampshade (6) comprises a hollow ring (6a) threadedly connected to the inner circumference of the hollow tube (5), a hollow truncated cone (6b) fixedly connected to the end of the hollow ring (6a), and a mounting tube (6c) fixedly mounted to the end of the hollow truncated cone (6b), and the grayscale block optical fiber interface (2) is mounted in the mounting tube (6c).

3. The electronic endoscope imaging quality detection device according to claim 2, characterized in that: The mounting tube (6c) has an annular groove (9) in it, and the grayscale block optical fiber interface (2) is externally mounted with a limiting convex ring (10) that cooperates with the annular groove (9).

4. The electronic endoscope imaging quality detection device according to claim 1, characterized in that: The inner circumferential surface of the light absorbing tube (7) is coated with light absorbing black paint, and the cross-sectional area of ​​the light absorbing tube (7) is larger than the cross-sectional area of ​​the gray scale block light source (3).

5. The electronic endoscope imaging quality detection device according to claim 2, characterized in that: A positioning frame (11) is fixedly installed in the hollow tube (5), a plurality of light-through holes (12) distributed in a ring array are penetrated in the positioning frame (11), and the light-absorbing tube (7) is fixedly connected to one side of the positioning frame (11).

6. The electronic endoscope imaging quality detection device according to claim 5, characterized in that: The outer circumferential surface of the light absorbing tube (7), the inner circumferential surface of the hollow ring (6a), the outer surface of the positioning frame (11), and the inner surface of the hollow truncated cone (6b) are all mirror-plated.

7. The electronic endoscope imaging quality detection device according to claim 5, characterized in that: A receiving groove (13) is provided in the positioning frame (11), the receiving groove (13) being in communication with the interior of the light absorbing tube (7), a second light guide plate (14) being placed in the receiving groove (13), the outer circumference of the second light guide plate (14) being on the same circumferential surface as the outer circumferential surface of the hollow tube (5).

8. The electronic endoscope imaging quality detection device according to claim 7, characterized in that: When the hollow tube (5) is fixedly mounted on the box (1), the second light guide plate (14) is located on a side of the box (1) close to the grayscale block optical fiber interface (2).

9. A method for operating the electronic endoscope imaging quality detection device according to any one of claims 2 to 8, characterized in that: The following steps are involved: S1. Install the object to be tested, and connect the object to be tested and the light box to a host computer, and then set the test information of the object to be tested, as well as the incident light brightness preset value and the background brightness preset value of the light box through the host computer; S2, the host computer adjusts the test brightness of the light box according to the test information of the object under test, and the preset value of the incident light brightness and the preset value of the background brightness of the light box; S3, setting sampling points of the object to be measured, wherein the sampling points are distributed between the dark area cut-off brightness and the saturation brightness of the light box; S4. The host computer captures at least 8 image acquisition screens of the object under test at each sampling point according to the sampling points of the object under test, and then inputs the test distance and Gamma correction value of the object under test into the host computer, and calculates the brightness response characteristics, signal-to-noise ratio and static image tolerance of the object under test according to the relationship between the grayscale value in the image acquisition screen captured by the host computer and the brightness of the outgoing light hole.

10. The method for using the electronic endoscope imaging quality detection device according to claim 9, characterized in that: In S2, in the step of adjusting the test brightness of the light box, the method of adjusting the brightness of the incident light output by the grayscale block light source (3) to the light guide (4) comprises: The lampshade (6) is driven to move the light absorbing tube (7) closer to or farther away from the grayscale block light source (3), thereby reducing or increasing the brightness of the incident light received by the light guide tube (4).

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