Endoscope optical performance testing system and testing method

Abstract

The application discloses an endoscope optical performance testing system and testing method, which comprises a uniform area light source, a sample table for loading an endoscope, a target table for loading two or more targets and a control unit; the target table comprises a test site and a target switching device, the test site is located between the uniform area light source and the sample table and close to the light outlet side of the uniform area light source, and the target switching device comprises one or more driving motors for switching the targets to the test site; the endoscope to be tested is provided with a camera or the visual end of the endoscope to be tested is connected with an imaging measuring device for testing, the image information obtained under each target is analyzed through the camera or the imaging measuring device, and corresponding parameters are obtained. The application can realize the goals of automation, simple operation, comprehensive measurement parameters and accurate testing results compared with the existing endoscope measurement technology, and can especially realize automatic measurement of multiple testing items without manual assistance after the endoscope is installed and aligned.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of endoscope optical performance measurement, and particularly relates to an endoscope optical performance test system and a test method. BACKGROUND

[0002] Medical endoscopes are important auxiliary diagnostic and treatment equipment, the head end of which enters the human body, and through the internal optical system, the human body tissue image can be intuitively displayed and treatment can be performed. Therefore, medical endoscopes need to accurately reflect the real situation of human body tissue while meeting biological safety, and the evaluation of various indexes of medical endoscopes, especially the optical performance indexes, is particularly important.

[0003] An endoscope and its system are generally composed of a medical cold light source, a visual or camera system, an endoscope body and the like, and an electronic endoscope can also realize the integration of a camera, an illumination light path and an operation part in the endoscope. The optical performance of the endoscope mainly includes light source characteristics, illumination characteristics and imaging characteristics, and comprehensive evaluation of the optical performance needs to comprehensively consider these parts. The cold light source performance includes spectral characteristics (correlated color temperature, color rendering index, etc.), radiation performance (infrared cutoff performance, RGB radiant flux ratio, total luminous flux, etc.); the illumination characteristics include color reproduction, illumination mirror body light efficiency, illumination uniformity, etc.; the imaging characteristics include field of view, viewing angle, angular resolution, depth of field, brightness response characteristics, signal-to-noise ratio, static image tolerance, etc.; the medical industry standards YY / T 0068.1 “Medical Endoscope - Hard Endoscope - Part 1: Optical Performance and Test Method”, YY / T 1587 “Medical Endoscope - Electronic Endoscope”, YY / T 1081-2011 “Medical Endoscope - Endoscope Function Supply Device - Cold Light Source” and the like provide test methods and determination bases for each test item (such as field of view, illumination mirror body light efficiency, spatial frequency response, etc.).

[0004] In the existing test scheme, the comprehensive evaluation of the optical performance of the endoscope needs to rely on multiple sets of equipment. For example, the light source test needs to build an integrating sphere and a spectrometer system, and the imaging system test needs to rely on an imaging system test instrument, and each measurement device has limited test items. In the measurement process, the alignment of the endoscope, the installation of the sample and the switching of the test target are mostly manual, which needs to consume a lot of time and effort. The operator not only needs to remember the operation process and repeatedly adjust the relative position of the sample and the target, but also needs to clamp the sample between different devices to realize the test conditions that meet the standard provisions and actual requirements, complete the comprehensive index measurement of the optical performance of the endoscope, and the manual alignment is prone to deviation. Even if the displacement is 1mm, a large measurement error will be generated through the magnification effect of the endoscope. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides an endoscope optical performance testing system and testing method, aiming to solve the technical problems of complex detection operation, large measurement workload, time-consuming and laborious, and large measurement result error of the optical performance of the endoscope in the prior art, and the present application can automatically and comprehensively evaluate multiple optical performance parameters of the endoscope.

[0006] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0007] The present application discloses an endoscope optical performance testing system, and the basic technical scheme can be described as follows: a uniform area light source, a sample table for loading and positioning a measured endoscope, a target table loading two or more targets, and a control unit; the target table includes a test site and a target switching device, the test site is located between the uniform area light source and the sample table, close to the light outlet side of the uniform area light source, and the target switching device includes one or more drive motors for switching the targets to the test site; the drive motor of the target switching device is electrically connected with the control unit; the measured endoscope is equipped with a camera or the visual end of the measured endoscope is connected with an imaging measuring device for testing, and the image information obtained under each target is analyzed by the camera or the imaging measuring device to obtain corresponding parameters. According to the above scheme, the present application can achieve the goals of more automation, simple operation, comprehensive measurement parameters, and accurate test results compared with the existing endoscope measurement technology, and in particular, the automatic measurement of multiple test items without manual assistance can be realized after the endoscope is installed and aligned.

[0008] It should be pointed out that the advantageous embodiments and technical scheme developments of the endoscope optical performance testing system according to the present application are the subject matter of the dependent claims.

[0009] As a technical scheme, the target switching device includes a roller blind mechanism composed of two or more rollers and a flexible picture scroll, the targets are located on the flexible picture scroll, the drive motor is connected with the rollers, and the drive motor controls the rotation of the rollers to drive the targets on the flexible picture scroll to move. The roller has the characteristics of small volume, convenient operation, and easy control, and the drive motor controls the rotation of the roller by a certain angle. Each target is moved to the test site by the motor control mode, and the automatic, rapid, and accurate switching of the test targets can be realized.

[0010] As a technical scheme, the target table comprises a rolling screen mechanism composed of a flexible picture scroll and a scroll shaft, a first guide rail, and a second target position arranged side by side with the rolling screen mechanism, the rolling screen mechanism and the second target position are arranged on the first guide rail, and a target is placed on the second target position, the target on the rolling screen mechanism or the second target position is switched to a test position by moving on the first guide rail. The target on the second target position is rigid, and is used for placing targets that cannot be carried by the flexible picture scroll, such as a diffuse reflection white board and an angle resolution test board.

[0011] As a technical scheme, the target table is a multi-surface column structure, the target is arranged on a column surface, and the target switching device further comprises a rotating mechanism connected with a driving motor. In the switching process, the uniform area light source is first retreated to a position not affecting the rotation of the target switching device of the multi-surface column structure, then the driving motor drives the rotating mechanism to switch the target in the target switching device of the multi-surface column structure to the test position, and after the switching is completed, the uniform area light source is restored to a position close to the target behind the target. Through the process, the target switching device of the multi-surface column structure is driven by the driving motor to switch the target in each column surface to the test position.

[0012] As a technical scheme, the target switching device comprises two target stacking tables and a fifth guide rail system for moving the target; the target is placed in the target stacking table in a stacking manner, and the target is moved by the fifth guide rail system under the driving of the driving motor to switch to the test position or a specified position in the target stacking table.

[0013] As a technical scheme, the endoscope optical performance test system further comprises an imaging luminance meter with an array detector, and the imaging luminance meter is aligned with the test position in the target table. The imaging luminance meter is used for testing the surface luminance of the target in the test position, and based on the imaging principle, a two-dimensional luminance evaluation of the to-be-tested screen can be made by one-time imaging. The imaging luminance meter can be a luminance measurement device based on a surface array photoelectric sensor, and is used for measuring and obtaining the luminance distribution state of a region in an imaging field of view. The imaging luminance meter has two main functions: one is to provide measurement values of background luminance and gray scale block luminance when measuring luminance response characteristics, static image tolerance and noise; and the other is to measure the light efficiency of the illumination mirror body, and the illumination ratio of the center of the field of view to the edge of the field of view is obtained by using the proportional relationship between luminance and illumination, and then the light efficiency value of the illumination mirror body of the endoscope mirror body is calculated.

[0014] As a technical scheme, the luminance and color temperature of the uniform area light source are adjustable, and the uniform area light source is electrically connected with the control unit. The uniform area light source provides uniform illumination for the transmission type target in front of the light emitting surface, so as to ensure the accuracy of the measurement result.

[0015] Further, the uniform surface light source can be realized as a flat light source, an integrating sphere light source or a projection light source. The uniform surface light source is located behind the target table and away from the sample table, and the light emitting surface is parallel to the test target. The flat light source can be realized by a backlight source plus a uniform diffuse transmission plate, and has uniform brightness on the light emitting surface to provide illumination for the transmission target. The integrating sphere light source has a light emitting source built-in or externally connected to the integrating sphere, and the light is mixed by multiple reflections in the integrating sphere to form uniform illumination and brightness at the light emitting port of the integrating sphere. Generally, the integrating sphere has higher spatial uniformity. The projection light source forms a uniform light spot on a specified object by projection technology. In this technical solution, the projection light source forms a uniform light spot on the transmission target, so that the imaging camera connected to the endoscope can obtain the target group. Preferably, the spatial brightness uniformity of the uniform surface light source is greater than 90%, and the local spatial brightness uniformity is greater than 98% to ensure the accuracy of the measurement results.

[0016] As a technical solution, the uniform surface light source is connected to a light source position adjusting device, and the relative position relationship between the target on the test site and the light emitting port of the uniform surface light source is adjusted by the position adjusting device to ensure that the light beam emitted by the uniform surface light source is accurately projected onto the test target, thereby ensuring the spatial brightness uniformity and the accuracy of the measurement results.

[0017] As a technical solution, in the endoscope optical system, the sample table is installed on a second guide rail that allows the sample table to move in a direction perpendicular to the light emitting port of the uniform surface light source. Further, the sample table can be adapted to different sizes of rigid endoscopes, flexible endoscopes, camera systems and combinations of camera systems and rigid endoscopes, and the working distance is adjusted by the movement of the sample table on the second guide rail.

[0018] Further, in the above-mentioned solution, the second guide rail further includes a displacement adjusting device, and the displacement adjusting device is electrically connected to a control unit. The movement of the sample table on the second guide rail is controlled by the control unit, which further simplifies the operation and facilitates the measurement.

[0019] As a technical solution, in the endoscope optical system, a cold light source measuring device is further included, which includes an integrating sphere and a spectral radiometer. The integrating sphere has a sampling port and a measuring window, and the measuring window is connected to the spectral radiometer. The light emitted by the measured endoscope enters the sampling port and is measured by the spectral radiometer. The sample table is switched between aligning the integrating sphere and aligning the uniform surface light source by a platform or rotation. The integrating sphere has a light homogenizing effect and is matched with the spectral radiometer for measurement. The measurement system can effectively measure the light flux, correlated color temperature, color rendering index, infrared cutoff performance, RGB radiant flux ratio and other test items in the illumination performance of the electronic endoscope, has high integration degree and is easy to operate.

[0020] Further, in the above technical solution, the sample table is switched between the alignment of the integrating sphere or the alignment of the uniform area light source by a platform or rotation, specifically including: the sampling port of the integrating sphere and the light outlet of the uniform area light source are placed side by side, and further including a third guide rail, the sample table is located on the third guide rail, and the alignment switching of the measured endoscope is realized by the platform of the sample table on the third guide rail; or the sampling port of the integrating sphere and the light outlet of the uniform area light source are placed at a certain angle, including a first rotary table, the sample table is connected with the first rotary table, and the first rotary table drives the sample table to rotate to realize the alignment switching of the measured endoscope. In the technical solution, the switching between different measurement items is realized by the movement of the sample table on the third guide rail or the rotation of the first rotary table, so that the operation is simple and convenient. Preferably, the third guide rail or the first rotary table has a displacement or rotation control device, the control device is electrically connected with the control unit, the switching of the sample table between the integrating sphere and the uniform area light source is controlled by the control unit, and then the switching of the measured endoscope between the alignment of the integrating sphere or the alignment of the uniform area light source is realized, further simplifying the operation, facilitating the measurement, and ensuring the accuracy of the measurement results.

[0021] Preferably, the spectral measurement range is 380 nm ~1700 nm.

[0022] As a technical solution, in the endoscope optical performance test system, the sample table includes an angle measuring mechanism. The measured endoscope rotates on the sample table, the rotation direction is vertical or horizontal, and the view direction angle is measured by the angle measuring mechanism, which can further ensure the accuracy of the measurement results.

[0023] Further, the straight line where the axis of the angle measuring mechanism is located intersects the center of the end of the endoscope and is perpendicular to the axis of the endoscope lens. In this way, when measuring the view direction angle of the endoscope, the endoscope can be rotated around the end center. This further simplifies the operation, facilitates the measurement, and ensures the accuracy of the results.

[0024] As a technical solution, one or more reflective light sources are provided in front of the test position of the target table, and the light emitted by the reflective light source irradiates the target of the test position. Further, in the above technical solution, the reflective light source is a ring light source to obtain higher spatial brightness uniformity, ensure the accuracy and reliability of the measurement results. As preferred, the uniformity of the reflective light source on the target of the test position is greater than 80%, the color temperature adjustment range is 3000 K ~7000 K, and the brightness adjustment range is 0 cd / m 2 ~4000 cd / m 2 .

[0025] Preferably, the reflective light source is electrically connected with the control unit, and the color temperature and brightness of the reflective light source are adjusted by the control unit.

[0026] As a technical solution, the target includes a transmissive target and / or a reflective target, and an empty target can also be arranged on the test site. The transmissive target is a light-transmitting target, and a uniform area light source behind the target provides illumination conditions. During testing, the relative position sequence is in turn the measured endoscope sample, the transmissive target, and the uniform area light source. The transmissive target can be realized as a distortion test target, a Siemens star test target, a field of view angle test target, etc. The reflective target is a non-light-transmitting target, and a reflective light source in front of the target provides illumination. The reflective target can be realized as a diffuse reflection whiteboard target, an adjustable gray scale test target, etc., to realize the testing of corresponding test items. The empty target has Lambertian characteristics. The empty target is arranged, light emitted by the electronic endoscope illumination system is incident on the empty target, and the brightness of each point on the test site plane is obtained by an imaging luminance meter. According to the proportional relationship between the brightness of the empty target plane and the illumination value, the light distribution or the light efficiency of the illumination lens can be further obtained.

[0027] As a technical solution, in the endoscope optical performance test system, an illuminometer and an illuminometer positioning device are further included. The illuminometer and the illuminometer positioning device are located in front of the light outlet of the uniform area light source, or the illuminometer and the illuminometer positioning device are arranged side by side with the uniform area light source, and the alignment switching of the measured endoscope is realized by the movement of the sample table. Preferably, the illuminometer positioning device is a fourth guide rail system that enables the illuminometer to move in two dimensions in a vertical plane. By two-dimensional translation, the illuminance of the light emitted by the electronic endoscope illumination system at each point on the test site plane is tested, and the light efficiency and the light distribution of the illumination lens can be obtained by calculation.

[0028] As a technical solution, in the endoscope optical performance test system, a housing is further included. The light outlet of the uniform area light source and the sample table are located inside the housing. A camera is arranged in the housing, the camera is aligned with the sample table, and the position of the endoscope tip is photographed. The camera is electrically connected with a control unit. The position of the sample table is fed back by the camera, and it is determined whether the measured endoscope is aligned with the test site. If not, the sample table is moved and / or rotated by the control unit to realize the alignment of the measured endoscope with the test site. The housing provides a darkroom test environment for the system.

[0029] As a technical solution, in the endoscope optical performance test system, the visual end of the mirror body of the measured endoscope is provided with an imaging measurement device for measurement and analysis or a camera device provided by the measured endoscope. The imaging measurement device is arranged at the visual end of the mirror body of the measured endoscope, and is used for optical performance test of the mirror body of the endoscope without an electronic imaging device. The camera device interface is matched with the size of the endoscope eyepiece end, and can be fixed behind the endoscope eyepiece. The camera device is connected to the control center, the field of view area of the endoscope eyepiece end can be transmitted to the control center, then projected on the display, and image acquisition is realized. In particular, the image collected by the camera is transmitted to the control center, and the test result can be determined and output through machine vision.

[0030] The application further discloses an endoscope optical performance test method. The test system comprises a uniform area light source, a sample table for loading and positioning a measured endoscope, a target table loaded with m (m≥2) targets, and a control unit. The target table comprises a test site. The test site is located between the uniform area light source and the sample table, and is close to the light outlet side of the uniform area light source. The measured endoscope is provided with a camera device or the visual end of the measured endoscope is connected to a test imaging measurement device. The optical performance test of the endoscope comprises the following steps.

[0031] S1: installing the measured endoscope on the sample table, aligning the tail end of the measured endoscope with the center of the test site, turning on the uniform area light source, and adjusting the uniform area light source to the required brightness and color temperature;

[0032] S2: the control unit controls the target table to move the ith (i∈[1,m]) target to the test site. The control unit projects the target image recognized by the measured endoscope into the display screen. Based on the camera device provided by the endoscope or the test imaging measurement device, each detection parameter is automatically recognized through an image recognition algorithm, and the corresponding optical performance is analyzed and calculated. The detection parameters include but are not limited to field of view angle, view direction angle, resolution, depth of field, etc.

[0033] S3: the control unit controls the target table to automatically switch another target to the test site, and repeats step S2 to test the optical performance of each corresponding endoscope.

[0034] As a technical solution, in the above optical performance test of the endoscope, the use of an imaging luminance meter is further included. A target with uniform Lambert characteristics is placed in the test site. The light emitted from the tail end of the measured endoscope irradiates on the target. The imaging luminance meter obtains the luminance distribution on the target. According to the conversion relationship between the illumination and the luminance on the target, the illumination distribution on the target is obtained, and then the light efficiency of the illumination mirror body can be calculated.

[0035] As a technical solution, in the optical performance test of the above endoscope, the use of an integrating sphere spectral radiometer system for measuring the performance of the light source is further included, and the control unit can switch the measured endoscope between aligning the integrating sphere spectral radiometer system or aligning the uniform area light source; the performance of the light source is measured before the S1 step or after the S2 step.

[0036] As a technical solution, in the optical performance test paper of the above endoscope, a position camera electrically connected with the control unit is further included, the position camera is aligned with the sample table, the position camera shoots the end position of the endoscope, and the alignment of the endoscope with the test position is judged; if the endoscope is not aligned with the test position, the alignment of the endoscope with the test position is realized through the control of the control unit. Specifically, the sample table can be moved and / or rotated through the control of the control unit by means of a guide rail, a platform or a rotary table, so as to realize the alignment of the measured endoscope with the test position.

[0037] As a technical solution, in the optical performance test of the above endoscope, the target switching sequence and the optical performance calculation process are preset in the control unit, and after the clamping and alignment of the measured sample are completed, the test process can be automatically completed and the test report can be obtained according to the preset.

[0038] The present application has the advantages that the present application provides an endoscope optical performance test system and a test method, which can effectively solve the problems of complex measurement operation, large measurement workload, time-consuming and laborious, and large measurement result error of the optical performance of the endoscope in the prior art. The present application can automatically and comprehensively evaluate multiple optical performance parameters of the endoscope, and ensure the accuracy of the measurement result. BRIEF DESCRIPTION OF DRAWINGS

[0039] ATTACHMENT Figure 1 A device schematic diagram for endoscope optical performance test is provided for the first embodiment of the present application.

[0040] ATTACHMENT Figure 2 A device schematic diagram for endoscope optical performance test is provided for the second embodiment of the present application.

[0041] ATTACHMENT Figure 3 A device schematic diagram for endoscope optical performance test is provided for the third embodiment of the present application.

[0042] ATTACHMENT Figure 4 A structure schematic diagram of a sample table is provided for the third embodiment of the present application.

[0043] ATTACHMENT Figure 5 A device schematic diagram for endoscope optical performance test is provided for the fourth embodiment of the present application.

[0044] ATTACHMENT Figure 6A device schematic diagram for electronic endoscope optical performance testing provided by the fifth embodiment of the present application;

[0045] attached Figure 7 A structure schematic diagram of an illumination measurement system provided by the fifth embodiment of the present application;

[0046] attached Figure 8 A device schematic diagram for endoscope optical performance testing provided by the sixth embodiment of the present application;

[0047] In the figure, 1-endoscope, 2-uniform area light source, 3-sample table, 4-target, 5-target table, 6-control unit, 7-test site, 8-target switching device, 9-driving motor, 10-reel, 11-flexible scroll, 12-first guide rail, 13-second target site, 14-imaging luminance meter, 15-external display device, 16-second guide rail, 17-third guide rail, 18-cold light source measurement device, 19-integrating sphere, 19-1 sampling port, 19-2 measurement window, 20-spectroradiometer, 21-first rotary table, 22-goniometer mechanism, 23-reflective light source, 24-position adjusting device, 25-illuminometer, 26-illumination measurement positioning device, 26-1 fourth transverse guide rail, 26-2 fourth longitudinal guide rail, 27-illuminometer clamping device, 28-camera, 29-fifth guide rail system, 30-clamp, 31-second rotary table, 100-enclosure. DETAILED DESCRIPTION

[0048] The specific embodiments of the present application are described below in conjunction with the accompanying drawings, but those skilled in the art should understand that the following embodiments are only for illustration, not to limit the scope of the present application. Those skilled in the art should understand that the following embodiments can be modified without departing from the scope and spirit of the present application. The scope of protection of the present application is defined by the appended claims.

[0049] Embodiment one

[0050] The present embodiment provides a device schematic diagram for endoscope optical performance testing, as shown in Figure 1 including a uniform area light source 2, a sample table 3 for loading and positioning the measured endoscope 1, a first rotary table 21, a target table 5 loaded with two or more targets 4, and a control unit 6. As shown in Figure 1(a) as shown, the sample table 3 is connected with the first rotary table 21, the first rotary table 21 drives the sample table 3 to rotate, thereby realizing the alignment of the measured endoscope 1; the target table 5 includes a test site 7 and a target switching device 8, the test site 7 is located between the uniform area light source 2 and the sample table 3, close to the light outlet side of the uniform area light source 2, the target switching device 8 includes a rolling screen mechanism composed of two reels 10 and a flexible picture scroll 11, the target 4 is located on the flexible picture scroll 11, the reel 10 supports and fixes the flexible picture scroll 11; the target switching device 8 also includes two drive motors 9 for switching the target 4 to the test site 7, the drive motor 9 device is located at the shaft center of the reel 10, the drive motor 9 is electrically connected with the control unit 6, the control of the drive motor 9 by the control unit 6 drives the reel 10 to rotate, thereby driving the target 4 on the flexible picture scroll 11 to move. The uniform area light source 2 is placed behind the target table 5, the light emitting surface is perpendicular to and parallel to the target 4, providing uniform illumination for the target 4. The color temperature and brightness of the uniform area light source can be adjusted, and the uniform area light source is connected with the control unit 6, which enables the control unit 6 to control the color temperature and brightness switching adjustment of the uniform area light source 2.

[0051] In this embodiment, the visual end of the measured endoscope 1 is connected with the imaging measurement device for testing. As shown in Figure 1 (b) as shown, the flexible picture scroll 11 is realized to be not easy to produce creases and can be flatly unfolded, the target 4 on the flexible picture scroll 11 includes a field of view angle target, a distortion target, a color restoration test target, an entrance pupil field of view angle test target, a Siemens sine star test target, an adjustable gray scale test target, etc. Each target 4 is moved to the test site 7 in turn by the motor control mode, the imaging measurement device obtains the pattern of the measured target 4 through the measured endoscope, and the corresponding parameters are obtained through intelligent algorithm analysis. For example, the imaging measurement device shoots the field of view angle measurement target, and through image recognition technology, the maximum field of view area displayed in the image is recognized and obtained, thereby obtaining the field of view angle of the measured endoscope. Through the automatic and accurate switching of the test target, the switching of different test items is realized.

[0052] Embodiment two

[0053] This embodiment provides another device schematic diagram for testing the optical performance of an endoscope, as shown in Figure 2As shown, it comprises a uniform plane light source 2, a sample table 3 for loading and positioning the endoscope 1 under test, a first rotary table 21, a target table 5 loaded with two or more targets 4, and a control unit 6. The sample table 3 is connected to the first rotary table 21, which drives the sample table 3 to rotate, thereby realizing the alignment of the endoscope 1 under test. The target table 5 comprises a test site 7 and a six-cylinder target switching device 8, and the targets 4 are respectively located on the six cylinders. The test site 7 is located between the uniform plane light source 2 and the sample table 3, close to the light outlet side of the uniform plane light source 2. The target switching device 8 comprises a driving motor 9 and a rotating mechanism connected to the driving motor 9, and the driving motor 9 is electrically connected to the control unit 6. Under the driving of the driving motor 9, the target switching device 8 switches the targets in each cylinder to the test site 7 in turn. The uniform plane light source 2 is located behind the target table 5 and is electrically connected to the control unit 6, and the brightness and color temperature are adjustable.

[0054] Specifically, in the switching process, the uniform plane light source 2 first retreats to a position that does not affect the rotation of the target switching device 8, then the driving motor 9 drives the rotating mechanism to switch the targets 4 in the six-cylinder target switching device 8 to the test site 7, and after the switching is completed, the uniform plane light source 2 is restored to the position behind the targets 4 close to the targets 4.

[0055] The visual end of the endoscope 1 under test in this embodiment is connected to the imaging measurement device for testing, and the same measurement method as in Embodiment One is used to obtain the optical parameters of the endoscope under test.

[0056] Embodiment Three

[0057] This embodiment provides another schematic diagram of a device for testing the optical performance of an endoscope, as shown in Figure 3As shown, it comprises a uniform plane light source 2, a sample table 3 for loading and positioning the endoscope 1 to be measured, a target table 5 for loading two or more targets 4, and a control unit 6. The target table 5 comprises a test site 7 and a target switching device 8. The test site 7 is located between the uniform plane light source 2 and the sample table 3, close to the light outlet side of the uniform plane light source 2. The target switching device 8 comprises a rolling screen mechanism composed of two rollers and a flexible picture scroll. The target 4 is located on the flexible picture scroll, and the rollers support and fix the flexible picture scroll. The target switching device 8 further comprises two drive motors 9 for switching the target 4 to the test site 7. The drive motors 9 are located at the center of the rollers, and are electrically connected to the control unit 6. The control unit 6 controls the drive motors 9 to drive the rollers to rotate, and then drive the target 4 on the flexible picture scroll to move. The target table 5 further comprises a first guide rail 12 and a second target site 13 arranged side by side with the rolling screen mechanism. The rolling screen mechanism and the second target site 13 are arranged on the first guide rail 12, and the second target site 13 is provided with rigid targets such as a diffuse reflection white board and an angle resolution test board. The first guide rail 12 is electrically connected to the control unit 6, and the control unit 6 controls the movement of the rolling screen mechanism and the second target site 13 along the first guide rail 12, so as to switch the target 4 on the rolling screen mechanism or the second target site 13 to the test site 7. The uniform plane light source 2 is arranged behind the target table 5, and the light emitting surface is perpendicular to and parallel with the target 4, so as to provide uniform illumination for the target 4.

[0058] In this embodiment, an imaging luminance meter 14 with an array detector and an external display device 15 are further included. The lens of the imaging luminance meter 14 is perpendicular to the test site 7 on the target table 5, and the shooting area covers the test site 7, so as to test the luminance of any area of the test site 7. The imaging luminance meter 14 and the external display device 15 are respectively connected to the control unit 6, so that the imaging luminance meter 14 tests the luminance of different areas of the test site 7 under control, and transmits the test data to the control unit 6, and then displays the test results on the external display device 15.

[0059] In this embodiment, the control unit 6 is realized as a control part, a data processing part, a communication area, and a program instruction part. The program instruction part outputs electrical signals to the control part, and the control part is electrically connected to the uniform plane light source 2, the sample table 3, the target table 5, and other parts to realize corresponding functions. The communication area comprises interfaces with the sample to be measured and the measuring components, so as to obtain and transmit the test data to the data processing part, and then obtain the test results and project the test results to the external display device 15.

[0060] This embodiment further provides a structural schematic diagram of a sample table, as shown in Figure 4As shown, the sample table 3 is composed of a second guide rail 16, a third guide rail 17, a first rotary table 21, an angle measuring mechanism 22 and an endoscope clamp 30. The measured endoscope 1 is clamped on the endoscope clamp 30, the first rotary table 21 is connected with the endoscope clamp 30 and the second guide rail 16 respectively, the angle measuring mechanism 22 is installed on the first rotary table 21, and the second guide rail 16 is connected with the third guide rail 17; the second guide rail 16, the third guide rail 17, the first rotary table 21 and the angle measuring mechanism 22 are electrically connected with the control unit 6 respectively. The first rotary table 21 drives the rotation of the measured endoscope 1 to realize the alignment switching of the measured endoscope 1, the second guide rail 16 is used for moving the measured endoscope 1 forward and backward, the third guide rail 17 is used for moving the measured endoscope 1 left and right, thereby realizing the alignment of the measured endoscope 1.

[0061] In the embodiment, the measured endoscope 1 is provided with a camera, and the field angle, the view angle, the spatial frequency response, the signal-to-noise ratio, the luminance response characteristic, the static image tolerance and the light efficiency of the illumination mirror can be measured through the system. Specifically, the measured endoscope 1 is clamped on the sample table 3, and the control unit 6 is controlled to drive the motor 9 to drive the target 4 on the flexible picture scroll to switch to the test position 7, so that the measured endoscope 1 provided with the camera is aligned with the target 4 on the flexible picture scroll. The camera of the measured endoscope captures the pattern of the target 4, and the optical parameters such as the field angle, the view angle, the distortion and the color restoration are obtained through intelligent algorithm analysis and calculation. Through the control of the control unit 6, the target 4 on the second target position 13 is switched to the test position 7, the imaging luminance meter 14 provided with an array detector is aligned with the test position 7, and the surface luminance distribution of the target 4 on the test position 7 is captured. The measured endoscope 1 provided with the camera is aligned with the rigid target on the second target position 13, the camera of the measured endoscope captures the pattern of the target, and the optical parameters such as the luminance response characteristic, the static image tolerance and the light efficiency of the illumination mirror are obtained through intelligent algorithm analysis and calculation. In the embodiment, the two-dimensional luminance evaluation of the measured target is made through one imaging of the imaging luminance meter 14, the test data is transmitted through the control unit 6, and is displayed on the external display device 15 for further calculation and analysis. When the luminance response characteristic, the static image tolerance and the noise are measured, the imaging luminance meter 14 provides the measured values of the background luminance and the gray scale block luminance. When the light efficiency of the illumination mirror is measured, the illumination ratio of the target field center to the target field edge is obtained through the proportional relationship between the luminance and the illumination, and the light efficiency value of the endoscope mirror is calculated.

[0062] Embodiment four

[0063] Another device schematic diagram for testing the optical performance of an endoscope is provided in the embodiment, as shown in FIG. 6. Figure 5As shown, it comprises a uniform surface light source 2, a sample table 3 for loading and positioning the endoscope 1 to be measured, a target table 5 for loading two or more targets 4, a control unit 6, an imaging luminance meter 14 with an array detector, and an external display device 15. The target table 5 comprises a test site 7 and a target switching device 8. The test site 7 is located between the uniform surface light source 2 and the sample table 3, close to the light outlet side of the uniform surface light source 2. The uniform surface light source 2 is a flat light source, placed behind the target table 5, with the light-emitting surface facing the targets 4, providing uniform illumination for the targets 4. The target switching device 8 comprises two target stacking tables, a drive motor 9 for switching the targets 4 to the test site 7, and a fifth guide rail system 29 for moving the targets; the target stacking tables are used to place the targets by stacking, and each target stacking table is rigid, including transmission targets such as field angle test targets, spatial frequency response test targets, etc., or reflective targets such as adjustable gray scale test targets, diffuse white boards, etc. The fifth guide rail system 29 comprises a transverse guide rail and a longitudinal guide rail, which are connected to form a "concave" shape. The target site moves forward and backward on the longitudinal guide rail to push the target site to the transverse guide rail or retract it from the transverse guide rail, and moves on the transverse guide rail to switch the target 4 to the test site 7. The drive motor 9 is electrically connected to the control unit 6, driving the target 4 to move through the fifth guide rail system 29 and switch to the test site 7 or a designated position in the target stacking table. The imaging luminance meter 14 lens is directly opposite the test site 7 on the target table 5, covering the test site 7 in the shooting area, and can test the brightness of any area of the test site 7. The imaging luminance meter 14 and the external display device 15 are respectively connected to the control unit 6, which enables the imaging luminance meter 14 to test the brightness of different areas of the test site 7, and transmits the test data to the control unit 6, and then displays it on the external display device 15.

[0064] In this embodiment, the sample table 3 comprises a second guide rail 16, a third guide rail 17, and a first rotary table 21. The endoscope 1 to be measured is clamped on an endoscope clamp, the first rotary table 21 is connected to the endoscope clamp and the second guide rail 16 respectively, and the second guide rail 16 is connected to the third guide rail 17; the second guide rail 16, the third guide rail 17, and the first rotary table 21 are electrically connected to the control unit 6 respectively. The first rotary table 21 drives the rotation of the endoscope 1 to be measured, thereby realizing the alignment switching of the endoscope 1 to be measured; the second guide rail 16 is used to move the endoscope 1 to be measured forward and backward, and the third guide rail 17 is used to move the endoscope 1 to be measured left and right, thereby realizing the alignment of the endoscope 1 to be measured. This device can realize the measurement of the endoscope field angle, viewing direction angle, spatial frequency response, signal-to-noise ratio, brightness response characteristic, static image tolerance, and illumination mirror light efficiency, and the specific measurement method is similar to that of embodiment three, which will not be described here.

[0065] Embodiment five

[0066] This embodiment provides a schematic diagram of yet another device for testing the optical performance of endoscopes, such as... Figure 6 As shown, the device includes a housing 100, a uniform surface light source 2, a sample stage 3 for mounting and positioning the endoscope 1 under test, a target stage 5 for mounting two or more targets 4, a reflective light source 23, a position adjustment device 24, an imaging luminance meter 14 with an array detector, an external display device 15, a cold light source measurement device 18, an illuminance measurement system, a camera 28, and a control unit 6. The testing device is housed inside the housing 100 and is implemented as a black, sealed enclosure. Thus, while providing protection and support, the housing 100 allows for measurement under dark conditions without the need for an additional darkroom for each optical performance test. The target stage includes a test position and a target switching device 8. The test position is located between the uniform surface light source 2 and the sample stage 3, near the light outlet of the uniform surface light source 2. The target switching device 8 includes a roller shutter mechanism consisting of two rollers and a flexible scroll. The target 4 is located on the flexible scroll, and the rollers support and fix the flexible scroll. The target switching device 8 also includes two drive motors that switch the target 4 to the test position. The drive motors are located at the center of the roller axis and are electrically connected to the control unit 6. The control unit 6 controls the drive motors to drive the rollers to rotate, thereby moving the target 4 on the flexible scroll.

[0067] In this embodiment, the uniform surface light source 2 is placed behind the target stage 5, with its emitting surface facing the target 4 and parallel to the target 4, providing uniform illumination to the target 4. The uniform surface light source 2 is connected to the position adjustment device 24, which is electrically connected to the control unit 6. The position adjustment device 24 adjusts the relative position between the target on the test position and the light outlet of the uniform surface light source to ensure that the light beam emitted by the uniform surface light source is accurately projected onto the target 4 at the test position.

[0068] In this embodiment, the reflected light source 23 is located in front of the test position of the target stage 5, near the sample stage 3, with its light-emitting surface facing the test position of the target stage 5, and is implemented as a ring light source. In this way, the reflected light source 23 provides uniform background illumination for the adjustable grayscale test target.

[0069] In this embodiment, the lens of the imaging luminance meter 14 is directly facing the test position on the target stage 5 for testing brightness. The imaging luminance meter 14 and the external display device 15 are respectively connected to the control unit 6, which allows the imaging luminance meter 14 to control the brightness of different areas of the test position and transmit the test data to the control unit 6, which is then displayed on the external display device 15.

[0070] In the embodiment, the camera 28 is located obliquely above the sample stage 3, the lens is directed to the sample stage 3, and the camera 28 is electrically connected to the control unit 6. The camera 28 is used to take pictures of the end position of the endoscope 1, and the pictures are projected to the external display device 15 via the control unit 6, so as to feedback the alignment of the endoscope end with the test position.

[0071] In the embodiment, the cold light source measuring device 18 comprises an integrating sphere 19 and a spectral radiometer 20. The inner wall of the integrating sphere 19 is coated with a uniform diffuse reflection coating, and is provided with two windows, i.e. a sampling port 19-1 and a measuring window 19-2. The measuring window 19-2 is used to connect the spectral radiometer 20, and the sampling port 19-1 is used to connect the sample of the endoscope 1 to be measured. The angle between the center lines of the two windows and the center of the sphere is 90°. The device can realize the measurement of parameters including luminous flux, correlated color temperature, color rendering index, infrared cutoff performance, and RGB radiant flux ratio.

[0072] In the embodiment, the surface of the sampling port 19-1 of the integrating sphere 19 in the cold light source measuring device 18 and the light outlet surface of the uniform area light source 2 are parallel to each other or coincide with each other. The illuminance measuring system is placed between the target stage 5 and the sample stage 3. As shown in Figure 7 the illuminance measuring system comprises an illuminometer 25, an illuminance measuring positioning device 26, and an illuminometer clamping device 27. The illuminometer 25 is arranged on the illuminometer clamping device 27, and the illuminometer clamping device 27 is arranged on the illuminance measuring positioning device 26. The measuring positioning device 26 is a fourth displacement system, which is electrically connected to the control unit 6 and comprises a fourth transverse guide rail 26-1 and a fourth longitudinal guide rail 26-2 which are perpendicular to each other. Specifically, the illuminometer clamping device 27 can also clamp an illuminance probe or an angular resolution plate. The illuminometer clamping device 27 can move in the vertical direction along the fourth longitudinal guide rail 26-2, and the fourth longitudinal guide rail 26-2 can move horizontally on the fourth transverse guide rail 26-1, so as to realize the two-dimensional movement of the illuminance probe or the angular resolution plate on the test position plane. When the illuminometer clamping device 27 clamps the illuminance probe, the light emitted by the endoscope illumination system irradiates on the test position plane, and the illuminance probe measures the illuminance at different positions under the traction of the fourth guide rail system, so as to calculate the light efficiency and light distribution characteristics of the illumination lens. When the illuminometer clamping device 27 clamps the angular resolution plate, the angular resolution plate moves to the center and edge positions of the field of view of the endoscope under the traction of the fourth guide rail system, so as to realize the measurement of the angular resolution parameters of the center and edge positions of the field of view of the endoscope sample. The control unit 6 can send instructions to the components of the system, so as to realize the functions of obtaining measurement data, data processing, projecting the test results and images to the external display device 15, and the like.

[0073] In the embodiment, the specific structure and function of the sample stage 3 are the same as those in Embodiment Four, and will not be described here.

[0074] The visual end of the measured endoscope 1 in this embodiment is provided with an imaging measurement device for measurement analysis. Through the control unit 6, instructions are sent to each component of the system, measurement data is obtained, data processing is performed, test results are projected to the external display device 15, and the like, so that the measurement of multiple optical parameters of the measured endoscope 1 is realized. The specific measurement includes: the measured endoscope 1 is installed on the sample table 3, the camera 28 is turned on, the camera 28 captures the picture and projects it to the external display device 15, and the measured endoscope 1 is moved to the front of the cold light source measurement device 18 through the control and adjustment of the control unit 6. The light emitted by the measured endoscope 1 enters the sampling port 19-1 and is measured by the spectral radiometer 20. After integration, the spectral data and radiation data are obtained, and the required color rendering index, color temperature, spectral relative distribution, luminous flux and other parameters are obtained through calculation and analysis processing. Through the control of the control unit 6, the measured endoscope 1 is aligned with the target 4 of the test site, and at the same time the control unit 6 controls the uniform area light source 2 to be turned on and adjusted to the required color temperature and brightness. The measured endoscope 1 captures the pattern of the target 4 and projects it to the external display device 15 through the control unit 6. Based on the image of the target 4, intelligent recognition algorithm processing is performed, different targets 4 are switched, and then the field of view angle, distortion, signal-to-noise ratio, spatial frequency response and other parameters are obtained. Through the control of the control unit 6, the illuminance of the light emitted by the measured endoscope 1 at each point of the test site plane is tested through two-dimensional translation using the illuminometer 25. The lighting mirror body light efficiency and light distribution can be obtained through calculation. For example, the target 4 is switched to an adjustable gray scale test target, the brightness of the uniform area light source 2 is adjusted to realize the brightness transformation of the small gray scale block, and the imaging brightness meter 14 captures the target 4 of the test site. The captured image is transmitted to the control unit 6 and then to the external display device 15. In this process, the brightness of the background and the small gray scale block in the target 4 is tested using the brightness meter 25, and the test data is transmitted to the control unit 6 and then to the external display device 15. Through the control unit 6, the above data is processed and analyzed to obtain the brightness response characteristic curve and the static image tolerance parameter. When measuring the lighting mirror body light efficiency, the illuminance probe measures the illuminance at different positions under the traction of the fourth guide rail system 26. The ratio of brightness to illuminance is used to obtain the illuminance ratio of the center of the target field of view to the edge of the target field of view, and then the lighting mirror body light efficiency value of the endoscope mirror body is calculated.

[0075] Embodiment six

[0076] This embodiment provides another device schematic diagram for testing the optical performance of an endoscope, as shown in Figure 8As shown, the present embodiment is an extension of embodiment five, and its components are substantially the same as those of embodiment five, and the same parts will not be described here. Different from embodiment five, in the present embodiment, the sampling port 19-1 of the integrating sphere 19 in the cold light source measuring device 18 and the light outlet of the uniform area light source 2 and the illuminometer are placed at a certain angle, the third guide rail 17 in the sample table 3 is replaced by a second rotary table 31, the second rotary table 31 is located below the second guide rail 16 and is connected to a driving device, and under the traction of the driving device, the second rotary table 31 can drive the measured endoscope to rotate, so as to realize the alignment switching of the center of the endoscope between the sampling port 19-1 of the integrating sphere 19, the target test site and the illuminometer. As described in embodiment five, through the cold light source measuring device 18 including the integrating sphere 19 and the spectral radiometer 20, the light emitted by the measured endoscope 1 enters the sampling port 19-1 and is measured by the spectral radiometer 20, and after integration, the spectral data and the radiation data are obtained, and through calculation and analysis, the color rendering index, the color temperature, the spectral relative distribution, the luminous flux and other parameters are obtained.

[0077] In the present embodiment, the measured endoscope 1 is provided with a camera device, the sampling port 19-1 of the integrating sphere 19 and the light outlet of the uniform area light source 2 are placed at a certain angle, the first rotary table 21 and the second rotary table 31 are rotated to drive the measured endoscope 1 to rotate, so as to realize the alignment switching of the measured endoscope 1, and the specific measurement method is similar to that of embodiment five, which will not be described here.

Claims

1. An endoscope optical performance testing system, characterized in that, The system includes a uniform surface light source (2), a sample stage (3) for loading and positioning the endoscope (1) under test, a target stage (5) for loading two or more targets (4), and a control unit (6); the target stage (5) includes a test position (7) and a target switching device (8), the test position (7) is located between the uniform surface light source (2) and the sample stage (3) near the light outlet of the uniform surface light source (2), and one or more reflective light sources (23) are provided in front of the test position (7) of the target stage (5), the light emitted by the reflective light sources (23) illuminates the target (4) of the test position (7); the target switching device (8) includes one or more drive motors (9) for switching the target (4) to the test position (7); the target switching device (8) includes one or more drive motors (9) for switching the target (4) to the test position (7); the target switching device (8) includes one or more drive motors (9) for switching the target (4) to the test position (7); the target switching device (8) includes one or more drive motors (9) for switching the target (4) to the test position (7); the target switching device (8) includes one or more drive motors (9) for switching the target (4) to the test position (7). The drive motor (9) of the sample stage (3) is electrically connected to the control unit (6); it also includes a second guide rail (16) that allows the sample stage (3) to move along a direction perpendicular to the light outlet of the uniform surface light source (2), the sample stage (3) being mounted on the second guide rail (16); it also includes an illuminance meter (25) and an illuminance measurement positioning device (26); the illuminance meter (25) and the illuminance measurement positioning device (26) are located in front of the light outlet of the uniform surface light source (2), or the illuminance meter (25) and the illuminance measurement positioning device (26) are arranged side by side with the uniform surface light source (2), and the alignment and switching of the endoscope (1) under test are realized by moving the sample stage (3); the illuminance measurement positioning device (26) is a fourth guide rail system that allows the illuminance meter (25) to move in two dimensions in a vertical plane. The target switching device (8) includes a roller shutter mechanism consisting of two or more rollers (10) and a flexible scroll (11). The target (4) is located on the flexible scroll (11). The drive motor (9) is connected to the rollers (10). The drive motor (9) controls the rollers (10) to rotate, thereby driving the target (4) on the flexible scroll (11) to move. Alternatively, the target switching device (8) is a multi-faceted cylindrical structure, with the target (4) located on the cylindrical surface; the target switching device (8) also includes a rotating mechanism connected to the drive motor (9), and under the drive of the drive motor (9), the target switching device (8) sequentially switches the targets (4) in each cylindrical surface to the test position (7). Alternatively, the target switching device (8) includes two target stacks and a fifth guide rail system (29) for moving the target (4); the target (4) is placed in the target stacks in a stacked manner, and the drive motor (9) drives the target (4) to move on the fifth guide rail system (29) to switch to the test position (7) or a designated position in the target stack.

2. The endoscope optical performance testing system according to claim 1, characterized in that, The target platform (5) also includes a first guide rail (12) and a second target position (13) arranged side by side with the roller blind mechanism. The roller blind mechanism and the second target position (13) are arranged on the first guide rail (12), and a target is placed on the second target position (13). The roller blind mechanism or the target (4) on the second target position (13) can be switched to the test position (7) by moving on the first guide rail (12).

3. The endoscope optical performance testing system according to claim 1, characterized in that, It also includes an imaging luminance meter (14) with an array detector, which is aligned with the test position (7) in the target stage (5).

4. The endoscope optical performance testing system according to claim 1, characterized in that, It also includes a position adjustment device (24) connected to the uniform surface light source (2), through which the relative position relationship between the target (4) on the test position and the light outlet of the uniform surface light source (2) is adjusted.

5. The endoscope optical performance testing system according to claim 1 or 2, characterized in that, It also includes a cold light source measuring device (18), which includes an integrating sphere (19) and a spectroradiometer (20). The integrating sphere (19) has a sampling port (19-1) and a measurement window (19-2). The measurement window (19-2) is connected to the spectroradiometer (20). The light emitted by the endoscope under test enters the sampling port (19-1) and is measured by the spectroradiometer (20). The sample stage (3) allows the endoscope under test (1) to switch between aligning with the integrating sphere (19) or aligning with the uniform surface light source (2) by means of a platform or rotation.

6. The endoscope optical performance testing system according to claim 5, characterized in that, The sample stage (5) allows the endoscope (1) under test to switch between aligning with the integrating sphere (19) or aligning with the uniform surface light source (2) via a platform or rotation. Specifically, the sampling port (19-1) of the integrating sphere (19) and the light output port of the uniform surface light source (2) are placed side by side, including a third guide rail (17). The sample stage (3) is located on the third guide rail (17), and the alignment of the endoscope (1) under test is achieved by the platform of the sample stage on the third guide rail (17). Alternatively, the sampling port (19-1) of the integrating sphere (19) and the light output port of the uniform surface light source (2) are placed at a certain angle, including a first turntable (21). The sample stage (3) is connected to the first turntable (21), and the first turntable (21) drives the sample stage (3) to rotate to achieve the alignment of the endoscope (1) under test.

7. The endoscope optical performance testing system according to claim 1, 2, or 3, characterized in that, The sample stage (3) includes an angle measuring mechanism (22).

8. The endoscope optical performance testing system according to claim 1, characterized in that, The target (4) includes a transmissive target and / or a reflective target, and an empty target may also be set on the test position (7).

9. The endoscope optical performance testing system according to claim 1, 2, or 3, characterized in that, It also includes a housing (100), the light outlet of the uniform surface light source (2) and the sample stage (3) are both located inside the housing (100); a camera (28) is set inside the housing (100), the camera (28) is aligned with the sample stage (3), and the camera (28) is electrically connected to the control unit (6).

10. The endoscope optical performance testing system according to claim 1, 2, or 3, characterized in that, The uniform surface light source is a flat panel light source, an integrating sphere light source, or a projection light source.

11. The endoscope optical performance testing system according to claim 1, 2, or 3, characterized in that, The endoscope (1) being tested includes an imaging measurement device for measurement and analysis at the visual end of the endoscope body.

12. A method for testing the optical performance of an endoscope based on the endoscope optical performance testing system of claim 1, characterized in that, The testing system includes a uniform surface light source, a sample stage for mounting and positioning the endoscope under test, a target stage loaded with m (m≥2) targets, and a control unit. The target stage includes a test position located between the uniform surface light source and the sample stage, near the light outlet of the uniform surface light source. The endoscope under test has its own camera or its visual end is connected to a testing imaging measurement device. The optical performance testing of the endoscope includes the following steps: S1: Mount the endoscope to be tested on the sample stage, align its end with the center of the test position, turn on the uniform surface light source and adjust it to the required brightness and color temperature; S2: The control unit controls the target stage to move the i-th (i∈[1,m]) target to the test position. The control unit projects the target image identified by the endoscope under test onto the display screen. Based on the target image identified by the endoscope's built-in camera or the imaging measurement device for testing, the control unit analyzes and calculates to obtain the corresponding optical performance. S3: The control unit controls the target stage to automatically switch another target to the test position and repeats step S2 to test the optical performance of each corresponding endoscope.

13. The method for testing the optical performance of an endoscope according to claim 12, characterized in that, The device includes an imaging luminance meter. A target with uniform Lambertian properties is placed at the test position. Light emitted from the end of the endoscope under test is irradiated onto the target. The imaging luminance meter obtains the luminance distribution on the target. Based on the conversion relationship between illuminance and luminance on the target, the illuminance distribution on the target is obtained, and then the luminous efficacy of the illuminating endoscope is calculated.

14. The method for testing the optical performance of an endoscope according to claim 12, characterized in that, The system includes an integrating sphere radiometer system for measuring the performance of a light source. The control unit can switch the endoscope under test between aligning with the integrating sphere radiometer system or with a uniform surface light source. The performance of the light source is measured before step S1 or after step S2.

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