Medical endoscope calibration system and method with electronic ink target display device

Abstract

The utility model provides a medical endoscope calibration system and method with electronic ink target display device relates to optical performance calibration technical field, in order to solve the problem existing in prior art, the system includes optical conversion lens group, electronic ink display screen, light source, turnover mechanism, five dimensional position adjustment platform, light shield cover, endoscope position adjustment mechanism, endoscope to be measured, control computer, high definition lens interface, image acquisition unit and LED cold light source, wherein, optical conversion lens group, electronic ink display screen, light source, turnover mechanism and five dimensional position adjustment platform constitute electronic ink target display device, utilize the characteristic that electronic ink display screen can display diffuse reflection image, to simulate geometric target, and through the development electronic ink display screen optical conversion system and corresponding control algorithm, make the whole equipment have miniaturization, intensive and automation characteristics, reduce the equipment manufacturing cost and detection cost, improve endoscope calibration efficiency, can realize endoscope calibration under the field condition.

Description

Technical Field

[0001] This invention relates to the field of optical performance calibration technology, and in particular to a medical endoscope calibration system and method with an electronic ink target display device. Background Technology

[0002] Electronic ink is a suspension system consisting of countless transparent microcapsules suspended in a transparent base liquid. These microcapsules contain black pigment and even smaller white particles. The pigment gives the transparent particles their color, while the smaller white particles, due to their electric double layer, carry a certain charge and move in a specific direction under the influence of electrostatic forces. When they concentrate and move in a particular direction, one side of the microcapsule, which would normally appear black, becomes white. In the absence of an electric field, the white charged particles are uniformly distributed within the microcapsules, displaying a mixed color. The movement of the white particles within a single microcapsule under the influence of an electric field when electronic ink is injected between two electrodes is illustrated.

[0003] Therefore, by studying the optical and physical properties of electronic ink displays, and utilizing the characteristic of electronic ink displays to display diffuse reflection images, a geometric target was simulated. By developing an optical conversion system, a dedicated light source and a flipping mechanism for electronic ink displays, and corresponding display control algorithms, the shortcomings of electronic ink displays, such as insufficient resolution, poor contrast, slow refresh rate, and low brightness and saturation, were overcome, and a medical endoscope calibration system with an electronic ink target display device was developed.

[0004] Technical problems with existing endoscope calibration devices:

[0005] 1. Using various glass standard target plates as geometric standard displays requires manual switching. If the national standard technical requirements are followed, more than 30 types of standard targets need to be configured, and the calibration process is prone to errors. At the same time, due to the need to repeatedly install the targets, the wear of the standard targets gradually becomes the main source of measurement uncertainty. Furthermore, the matching adjustment device may need to be repeatedly adjusted, making the calibration process cumbersome, and the detection time cost and human error rate are both high.

[0006] 2. Using OLEDs and LCDs as standard targets can theoretically replace glass standard target sheets, potentially enabling automatic or semi-automatic detection. However, since these two optical devices use active or transmissive light emission, the displayed images require high refresh rates. Therefore, in high-resolution applications, severe moiré fringe effects will occur, which will seriously affect multiple optical parameters such as resolution, contrast, and brightness uniformity of the displayed image, limiting the application areas of the above methods. Summary of the Invention

[0007] In order to solve the problems existing in the prior art, the present invention proposes a medical endoscope calibration system and method with an electronic ink target display device.

[0008] The technical solution of this invention to solve the technical problem is as follows:

[0009] A medical endoscope calibration system with an electronic ink target display device is characterized in that the system includes an optical conversion lens assembly, an electronic ink display screen, a light source, a flipping mechanism, a five-dimensional posture adjustment stage, a light-shielding cover, an endoscope posture adjustment mechanism, an endoscope under test, a control computer, a high-definition lens interface, an image acquisition unit, and an LED cold light source; wherein, the optical conversion lens assembly, the electronic ink display screen, the light source, the flipping mechanism, and the five-dimensional posture adjustment stage constitute the electronic ink target display device;

[0010] The optical conversion lens group converts optical parameters such as resolution of the e-ink display screen, and after modulation, it can meet the endoscope calibration requirements; the optical conversion lens group converts the optical magnification of the target displayed on the e-ink display screen and matches it to the entrance pupil of the endoscope under test.

[0011] The electronic ink display screen is used to display image resolution targets, field of view targets, viewing angle targets, distortion targets, and standard black and white targets;

[0012] The light source is mounted on the outer frame of the e-ink display screen, providing a standard external light source for the e-ink display screen and transmitting the image to the subsequent optical system through diffuse reflection;

[0013] The electronic ink display and light source are connected to the control computer; in view of the diffuse reflection characteristics of the electronic ink display, the light source and control computer provide adaptive control of the external light source, thereby automatically adjusting the optical parameters such as the contrast and brightness of the endoscope display image to match the calibration system.

[0014] The flipping mechanism is a rotatable worktable on which different devices can be installed. One side is equipped with an electronic ink display screen, and the other side is provided with a dedicated slot for installing a standard colorimeter or standard light source to meet the requirements for calibration of other parameters of the endoscope. The flipping mechanism is set on a five-dimensional pose adjustment platform. The light-shielding cover is set on the base and connected to the outer frame of the electronic ink display screen, which encloses the electronic ink display screen, the optical conversion lens group and the entrance pupil of the endoscope under test in the light-shielding area.

[0015] The endoscope under test is set in the endoscope position adjustment mechanism to adjust the position and angle of the endoscope so that it meets the endoscope calibration requirements.

[0016] The image acquisition system displays the images obtained through the endoscopic imaging system on a computer screen for magnified observation, replacing direct observation by the human eye through the endoscope.

[0017] The high-definition lens interface is connected to the endoscope under test and is matched with the image acquisition unit; the LED cold light source is connected to the endoscope under test.

[0018] A method for calibrating a medical endoscope with an electronic ink target display device, characterized by comprising the following steps:

[0019] Step 1: Install the endoscope to be tested onto the endoscope position adjustment device. This device can automatically adapt and clamp according to the diameter of the endoscope to be tested, and stably and high mount it onto the high-definition lens interface.

[0020] Step 2: Adjust the control computer to make the optical conversion lens group, electronic ink display, light source and flipping mechanism display the initial optical calibration parameters;

[0021] Step 3: Input the nominal optical parameters of the rigid endoscope under test into the control computer, including field of view, viewing angle, nominal resolution, and focal length.

[0022] Step 4: Adjust the brightness of the light-shielding cover and the light source to make the image brightness and contrast of the e-ink display screen under test moderate;

[0023] Step 4: Adjust the installation distance and angle of the endoscope under test by adjusting the endoscope position adjustment device so that the center of the field of view is in the center of the screen.

[0024] Step 5: The field of view, viewing angle, resolution, and geometric distortion optical parameters of the rigid endoscope under test are calibrated by controlling the computer.

[0025] Step 6: After calibration is complete, proceed to the calibration result output module to output the corresponding calibration records and generate a calibration report.

[0026] The present invention achieves the following beneficial technical effects compared to the prior art:

[0027] By studying the optical and physical properties of electronic ink displays, and utilizing their ability to display diffuse reflection images, a geometric target was simulated. Furthermore, by developing an optical conversion system and corresponding control algorithms for electronic ink displays, the shortcomings of insufficient resolution, poor contrast, slow refresh rate, and low brightness and saturation were overcome, resulting in the development of a medical endoscope calibration system with an electronic ink target display device.

[0028] 1. This invention develops a medical endoscope calibration system with an electronic ink target display screen. The developed dedicated electronic ink display screen can display resolution targets, field-of-view targets, directional targets, distortion targets, and standard black and white targets. Its graphics have diffuse reflection characteristics, thereby solving the drawbacks of moiré stripes in existing OLED and LCD display devices, and can present standard geometric targets more completely.

[0029] 2. By developing a modulation light source module, a standard light source can be provided according to the characteristics of electronic ink displays, thus solving the problem of their inability to emit light on their own.

[0030] 3. The developed optical conversion lens group can improve the resolution, enhance image contrast and uniformity of the dedicated electronic ink display screen, and convert the generated geometric target to the optical entrance pupil of the endoscope under test according to the technical requirements of "YY 0068.1-2008 Medical Endoscope Rigid Endoscope Part 1: Optical Performance and Test Methods". The aforementioned target is modulated into various standard targets that meet the requirements of calibrating medical endoscopes, thereby solving the problem that electronic ink display screens cannot be used for endoscope calibration due to their own defects such as resolution, screen size mismatch and other display problems.

[0031] 4. By studying the display characteristics of electronic ink displays, we developed targeted display control algorithms and light source characteristic matching algorithms, which improved the optical indicators such as contrast, uniformity and color accuracy of the image.

[0032] 5. By adopting the above methods, the entire equipment is miniaturized, integrated, and automated, thereby reducing equipment manufacturing and testing costs, improving endoscope calibration efficiency, and enabling endoscope calibration under on-site conditions. Attached Figure Description

[0033] Figure 1 A medical endoscope calibration system with an electronic ink target display device;

[0034] Figure 2 This is a schematic diagram of the optical conversion lens assembly described in this invention.

[0035] In the diagram: 1-Optical conversion lens group; 2-Electronic ink display screen; 3-Light source; 4-Flipping mechanism; 5-Five-dimensional pose adjustment stage; 6-Light shield; 7-Endoscope pose adjustment mechanism; 8-Endoscope under test; 9-Control computer; 10-High-definition lens interface; 11-Image acquisition unit; 12-LED cold light source. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1As shown, a medical endoscope calibration system with an electronic ink target display device includes an optical conversion lens assembly 1, an electronic ink display screen 2, a light source 3, a flipping mechanism 4, a five-dimensional pose adjustment stage 5, a light-shielding cover 6, an endoscope pose adjustment mechanism 7, an endoscope under test 8, a control computer 9, a high-definition lens interface 10, an image acquisition unit 11, and an LED cold light source 12. The optical conversion lens assembly 1, the electronic ink display screen 2, the light source 3, the flipping mechanism 4, and the five-dimensional pose adjustment stage 5 constitute the electronic ink target display device.

[0038] like Figure 2 As shown, the optical conversion lens group 1 consists of 8 lens elements in a symmetrical structure. It has an effective focal length of 15.7mm, a total length of 139.98mm, an F-number of 1.73, an entrance pupil of 19.00mm, and an exit pupil of 176.06mm. From left to right, the lens elements are: E48R plastic aspherical lens 1-1, H-ZPK7 spherical glass lens 1-2, H-ZLAF6 spherical glass lens 1-3, D-ZF93 spherical glass lens 1-4, D-FK61 spherical glass lens 1-5, E48R plastic aspherical lens 1-6, H-LAK7A plane glass lens 1-7, and H-K5 plane glass lens 1-8. The structure and materials are mainly used to reduce field curvature and distortion. Two plastic aspherical lenses are used to correct distortion and coma, while also taking into account the correction of other phase aberrations. The eight lens group adopts a coating anti-reflection optimization and a multi-layer anti-reflection anti-stray light structure to ensure that the light throughput and image quality of the system meet the endoscope calibration requirements.

[0039] The optical conversion lens group 1 converts the optical parameters such as resolution of the electronic ink display screen 2, and after modulation, it can meet the endoscope calibration requirements; the optical conversion system 1 converts the optical magnification of the target displayed on the electronic ink display screen 2 and matches it to the pupil of the endoscope being tested.

[0040] The electronic ink display screen 2 is used to display image resolution targets, field of view targets, viewing angle targets, distortion targets, and standard black and white targets.

[0041] The light source 3 is installed on the outer frame of the e-ink display screen 2 to provide a standard external light source for the e-ink display screen 2 and transmits the image to the subsequent optical system through diffuse reflection; the light source 3 is a medical cold light source.

[0042] The control computer 9 is connected to the electronic ink display 2 and the light source 3; in view of the diffuse reflection characteristics of the electronic ink display 1, the light source 3 and the control computer 9 provide adaptive control of the external light source, thereby automatically adjusting the optical parameters such as the contrast and brightness of the endoscope display image to match the calibration system.

[0043] The flipping mechanism 4 is a rotatable worktable on which different devices can be installed. One side is equipped with an electronic ink display screen 2, and the other side has a dedicated slot for installing standard colorimetric plates, standard light sources, and other equipment to meet the requirements for calibrating other parameters of the endoscope. The flipping mechanism 4 is mounted on a five-dimensional pose adjustment stage 5. The light-shielding cover 6 is mounted on the base and connected to the outer frame of the electronic ink screen 2, enclosing the entrance pupil of the electronic ink screen display screen 2, the optical conversion lens group 1, and the endoscope 8 under test within the light-shielding area.

[0044] The endoscope 8 to be tested is set in the endoscope position adjustment mechanism 7 to adjust the position and angle of the endoscope so that it meets the endoscope calibration requirements.

[0045] The image acquisition system 11 displays the images from the endoscopic imaging system on a computer screen for magnified observation, replacing direct observation through the endoscope by the human eye, avoiding observation fatigue, and making observation and operation convenient.

[0046] The high-definition lens interface 10 is connected to the endoscope 8 under test and is matched with the image acquisition unit 11; the LED cold light source 12 is connected to the endoscope 8 under test.

[0047] A method for calibrating a medical endoscope with an electronic ink target display device includes the following steps:

[0048] Step 1: Install the endoscope 8 to be tested onto the endoscope position adjustment device 7. This device can automatically adapt and clamp according to the diameter of the endoscope 8 to be tested, and stably and high mount it onto the high-definition lens interface 7.

[0049] Step 2: By adjusting the control computer 9, the initial optical calibration parameters are displayed in the optical conversion lens group 1, the electronic ink display screen 2, the light source 3, and the flipping mechanism 4.

[0050] Step 3: Input the nominal optical parameters of the rigid endoscope to be tested, such as field of view, viewing angle, nominal resolution, and focal length, into the control computer 9.

[0051] Step 4: Adjust the brightness of the light-shielding cover 6 and the light source 3 to make the image brightness and contrast of the electronic ink display screen 2 under test moderate;

[0052] Step 4: Adjust the installation distance and angle of the endoscope 8 under test by adjusting the endoscope position adjustment device 7 so that the center of the field of view is in the center of the screen.

[0053] Step 5: The computer 9 is used to calibrate the optical parameters of the rigid endoscope under test, such as the field of view, viewing angle, resolution, and geometric distortion.

[0054] Step 6: After calibration is complete, proceed to the calibration result output module to output the corresponding calibration records and generate a calibration report.

[0055] This invention has illustrated its principles and implementation methods using specific examples. The descriptions of these embodiments are merely illustrative of the method and its core ideas; furthermore, those skilled in the art will recognize that modifications may be made to the specific implementation methods and application scope based on the principles of this invention. Therefore, the content of this specification should not be construed as limiting the invention.

Claims

1. A medical endoscope calibration system with an electronic ink target display device, characterized in that, The system includes an optical conversion lens group (1), an electronic ink display screen (2), a light source (3), a flipping mechanism (4), a five-dimensional pose adjustment stage (5), a light shield (6), an endoscope pose adjustment mechanism (7), an endoscope under test (8), a control computer (9), a high-definition lens interface (10), an image acquisition unit (11), and an LED cold light source (12); among which, the optical conversion lens group (1), the electronic ink display screen (2), the light source (3), the flipping mechanism (4), and the five-dimensional pose adjustment stage (5) constitute an electronic ink target display device; The optical conversion lens group (1) performs optical magnification conversion on the target displayed on the electronic ink display screen (2) and matches it to the entrance pupil of the endoscope (8) to be tested; The electronic ink display screen (2) is used to display image resolution targets, field of view targets, viewing angle targets, distortion targets, and standard black and white targets; The light source (3) is installed on the outer frame of the electronic ink display (2) to provide a standard external light source for the electronic ink display (2) and transmit the image to the subsequent optical system through diffuse reflection; The electronic ink display (2) and the light source (3) are connected to the control computer (9); in view of the diffuse reflection characteristics of the electronic ink display (2), the light source (3) and the control computer (9) provide adaptive control of the external light source, thereby automatically adjusting the contrast and brightness of the endoscope display image to match the calibration system; The flipping mechanism (4) is a rotatable worktable, with an electronic ink display screen (2) installed on one side and a special slot on the other side for installing a standard color plate or a standard light source; the flipping mechanism (4) is set on a five-dimensional pose adjustment stage (5); the light shield (6) is set on the base and connected to the outer frame of the electronic ink display screen (2), and closes the entrance pupil of the electronic ink display screen (2), the optical conversion lens group (1) and the endoscope (8) under test within the light shield area; The endoscope to be tested (8) is set in the endoscope position adjustment mechanism (7) to adjust the position and angle of the endoscope so that it meets the endoscope calibration requirements; The image acquisition unit (11) displays the image from the endoscopic imaging system on the computer screen; The high-definition lens interface (10) is connected to the endoscope (8) under test and is matched with the image acquisition unit (11); the LED cold light source (12) is connected to the endoscope (8) under test. The optical conversion lens group (1) comprises eight lens elements with a symmetrical structure. The effective focal length is 15.7 mm, the total length is 139.98 mm, the F-number is 1.73, the entrance pupil position is 19.00 mm, and the exit pupil position is 176.06 mm. From left to right, the lens elements are: E48R plastic aspherical lens (1-1), H-ZPK7 spherical glass lens (1-2), H-ZLAF6 spherical glass lens (1-3), D-ZF93 spherical glass lens (1-4), D-FK61 spherical glass lens (1-5), E48R plastic aspherical lens (1-6), H-LAK7A plane glass lens (1-7), and H-K5 plane glass lens (1-8). The eight lens elements employ a coating anti-reflection optimization and a multi-layer anti-reflection stray light structure to ensure that the system's light throughput and image quality meet the endoscope calibration requirements. The light source (3) is a medical cold light source.

2. The medical endoscope calibration method of the medical endoscope calibration system according to claim 1, characterized in that, Includes the following steps: Step 1: Install the endoscope (8) to be tested onto the endoscope position adjustment mechanism (7). The endoscope position adjustment mechanism (7) can automatically adapt and clamp according to the diameter of the endoscope (8) to be tested, and make it stably and reliably installed onto the high-definition lens interface (10). Step 2: By adjusting the control computer (9), the initial optical calibration parameters are displayed on the optical conversion lens group (1), the electronic ink display screen (2), the light source (3), and the flipping mechanism (4); Step 3: Input the nominal optical parameters of the endoscope (8) to be tested, including field of view, viewing angle, nominal resolution and focal length, into the control computer (9); Step 4: Adjust the brightness of the light-shielding cover (6) and the light source (3) to make the image brightness and contrast of the electronic ink display (2) moderate; Step 5: Adjust the installation distance and angle of the endoscope (8) under test by adjusting the endoscope position adjustment mechanism (7) so that the center of the field of view is in the center of the screen. Step 6: The computer (9) is used to calibrate the field of view, direction of view, resolution and geometric distortion optical parameters of the endoscope (8) under test. Step 7: After calibration is completed, proceed to the calibration result output module to output the corresponding calibration records and generate a calibration report.

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