CN116184649A - Lighting system, endoscope and dimming method thereof - Google Patents

Abstract

The application discloses an illumination system, which is applied to the technical field of endoscopes, and comprises a light source device, a light guide device and a light quantity distribution modulation device, wherein the light quantity distribution modulation device is arranged between the light source device and the light guide device and is used for controlling the accumulated light quantity of illumination light respectively incident to each position of an input end face of the light guide device in a preset time period so as to meet the preset light quantity distribution requirement; the light guide device comprises a plurality of optical fibers, wherein the arrangement positions of the optical fibers on the input end face of the light guide device are consistent with the arrangement positions of the optical fibers on the output end face of the light guide device, so that the light quantity incident on the input end face can be conducted out of the output end face through the light guide device unchanged in distribution. The illumination system of the present application can thus adjust the light quantity distribution of the output illumination light. The application also discloses an endoscope and a dimming method thereof.

Description

Lighting system, endoscope and dimming method thereof

Technical Field

The present application relates to the technical field of lighting systems, and in particular, to a lighting system. The application also relates to an endoscope and a dimming method.

Background

The existing dimming method of the endoscope lighting system comprises the following steps: the light source outputs illumination light with fixed facula form, and the illumination light is conducted through the illumination fiber bundle to illuminate the detected object; light scattered by the object is received by the image sensor and forms an image; and judging the brightness of the formed image, and if the image has an overexposure region, reducing the brightness of the light source so as to improve the overexposure phenomenon of the image.

The disadvantages of this lighting dimming method are: only the overall brightness of the illumination light can be adjusted. In practical application, the detected objects have obvious depth difference, and often have short-range brightness due to the overexposure of the image. The dimming method is used for integrally dimming the brightness of illumination light, and the overexposure phenomenon of the near view of the image is improved, but the far view brightness of the image is darker.

Accordingly, the existing endoscope illumination system and the dimming method thereof have yet to be improved.

Disclosure of Invention

An object of the present application is to provide an illumination system that can adjust a light quantity distribution of illumination light output in a preset period of time. The application also provides an endoscope and a dimming method.

In order to achieve the above purpose, the present application provides the following technical solutions:

an illumination system includes a light source device, a light guide device, and a light quantity distribution modulation device:

the light source device is used for emitting illumination light;

the light guide device comprises a plurality of optical fibers, and the arrangement positions of the optical fibers on the input end face of the light guide device are consistent with the arrangement positions of the optical fibers on the output end face of the light guide device;

the light quantity distribution modulation device is arranged between the light source device and the light guide device and is used for controlling the accumulated light quantity of illumination light respectively entering each position of the input end face of the light guide device in a preset time period so as to meet the preset light quantity distribution requirement.

Optionally, the method further comprises:

a collimator unit provided between the light source device and the light quantity distribution modulator, and configured to allow the illumination light emitted from the light source device to enter the light quantity distribution modulator as parallel light;

and the converging component is arranged between the light quantity distribution modulation device and the light guide device and is used for converging the illumination light emitted by the light quantity distribution modulation device and making the illumination light enter the input end face of the light guide device.

Optionally, the light quantity distribution modulation device includes:

deflection means for changing the incident position of the illumination light on the input end face;

and the control device is in communication connection with the deflection device and is used for controlling the deflection device so that the illumination light sequentially enters the input end face in the preset time period, wherein the incidence positions of the illumination light on the input end face and/or the frequencies of the illumination light entering the positions of the input end face are determined according to the preset light quantity distribution requirement.

Optionally, the light quantity of the illumination light emitted by the light source device is adjustable, so that the light quantity of the illumination light is determined according to the preset light quantity distribution requirement when the illumination light enters each incident position of the input end face, the frequency of the illumination light entering each position of the input end face and/or the illumination light enters each incident position.

Optionally, the diameter of the light spot of the illumination light incident on the input end face is smaller than the diameter of the input end face.

Optionally, the deflection device comprises a two-dimensional scanning galvanometer or a set of rotating prisms.

Optionally, the deflection device comprises a MEMS galvanometer.

Optionally, the deflection device further comprises a first reflective element, the first reflective element being located between the collimation assembly and the MEMS galvanometer.

Optionally, the light quantity distribution modulation device includes: and the spatial light modulation device is used for enabling the light quantity of the illumination light which is incident at each position of the input end face at the same time to meet the preset light quantity distribution requirement.

Optionally, the spatial light modulator device comprises a liquid crystal spatial light modulator.

Optionally, the spatial light modulator device comprises a digital micromirror spatial light modulator.

Optionally, the light quantity distribution modulation device further includes a second reflection element, and the second reflection element is disposed between the light source device and the dmd.

An endoscope comprising an imaging system and an illumination system as described above.

A dimming method applied to an endoscope as described above, comprising:

determining a light quantity distribution requirement;

and the light quantity distribution modulation device enables the accumulated light quantity of the illumination light respectively incident to each position of the input end surface of the light guide device to meet the light quantity distribution requirement in the next exposure time period of the imaging system.

Optionally, the determining the light quantity distribution requirement includes: and determining the light quantity distribution requirement according to the spatial brightness distribution condition of the image currently output by the imaging system.

As can be seen from the above technical solution, the illumination system provided by the present application includes a light source device, a light guide device, and a light quantity distribution modulation device, where the light quantity distribution modulation device is disposed between the light source device and the light guide device, and is capable of controlling the cumulative light quantity of illumination light respectively incident to each position of an input end surface of the light guide device in a preset time period, so as to meet a preset light quantity distribution requirement; the arrangement positions of the optical fibers in the light guide device at the input end face of the light guide device are consistent with the arrangement positions of the optical fibers at the output end face of the light guide device, so that the light quantity distribution incident on the input end face can be conducted out of the output end face unchanged. Thus, the illumination system of the present application can adjust the light quantity distribution of the illumination light output in the preset period of time; when the light-adjusting device is applied to an endoscope, the light-adjusting device can be convenient for adjusting the light differently for each area of the endoscope image.

The application provides an endoscope can carry out the differentiation to each region of endoscope image and adjust luminance, and then promotes endoscope imaging quality.

According to the dimming method, differentiated dimming can be conducted on each area of the endoscope image, and therefore the imaging quality of the endoscope is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of an illumination system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an input end face and an output end face of a light guiding device according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of the trajectory of an illumination light incident on an input surface as used in an embodiment of the present application;

FIG. 4 is a schematic view of an illumination system according to yet another embodiment of the present disclosure;

FIG. 5 is a schematic view of an illumination system according to yet another embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an illumination system according to yet another embodiment of the present application;

FIG. 7 is a schematic diagram of an illumination system according to yet another embodiment of the present application;

FIG. 8 is a schematic view of an illumination system according to yet another embodiment of the present disclosure;

fig. 9 is a flowchart of a dimming method according to an embodiment of the present application.

Detailed Description

In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

In practical applications, since there is a significant depth difference between the detected objects, the collected endoscopic image tends to be a near-view overexposure and a far-view luminance is insufficient. The existing dimming method aims at the overexposure phenomenon, and the light quantity of illumination light is integrally reduced, so that the overexposure phenomenon of the near view of an image can be improved, but the far view brightness of the image is darker, and the local imaging quality of an endoscope image is reduced.

In order to improve the overall quality of the endoscopic image, it is necessary to perform differential dimming for each region of the endoscopic image. However, the existing illumination system can only adjust the whole light quantity of illumination light, and cannot achieve the purpose.

For this reason, the inventors found that: this is mainly because the existing illumination system generally adopts an illumination fiber bundle as a light guide device, and the optical fibers in the illumination fiber bundle are irregular between the arrangement position of the input end face and the arrangement position of the optical fibers in the output end face, so that the light quantity distribution of the illumination light output by the illumination system cannot be modulated.

In view of this, the present application provides an illumination system, an endoscope including the illumination system, and a dimming method.

The lighting system comprises a light source device and a light guide device, and a light quantity distribution modulation device arranged between the light source device and the light guide device and used for adjusting the light quantity distribution of illumination light incident on the input end face of the light guide device. The light guide device adopted by the illumination system comprises a plurality of optical fibers, wherein the arrangement positions of the optical fibers on the input end face of the light guide device are consistent with the arrangement positions of the optical fibers on the output end face, so that the light quantity distribution incident on the input end face can be conducted out of the output end face unchanged. Thus, the light quantity distribution of the outputted illumination light can be modulated, and the differential dimming can be performed for each region of the endoscopic image.

Further, it is considered that the image sensor senses the light quantity of illumination light reflected by the detected object during the exposure period to generate a corresponding endoscopic image in the endoscopic imaging process. Therefore, in practical applications, as long as the cumulative light quantity of the illumination light respectively incident on each position of the input end face of the light guide device in the exposure period can meet the preset light quantity distribution requirement, the differential dimming can be performed for each region of the endoscope image. Therefore, in the embodiment of the present application, the light quantity distribution modulation device is specifically configured to control the cumulative light quantity of the illumination light respectively incident to each position of the input end face of the light guide device in the preset time period, so as to satisfy the preset light quantity distribution requirement.

The lighting system, the endoscope and the dimming method thereof provided by the embodiment of the application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic diagram of an illumination system provided in this embodiment, and as shown in fig. 1, the illumination system includes a light source device 100, a light quantity distribution modulation device 101, and a light guiding device 102. The light quantity distribution modulation device 101 is provided between the light source device 100 and the light guide device 102, and the illumination light emitted from the light source device 100 passes through the light quantity distribution modulation device 101, and then enters the light guide device 102, and the light guide device 102 guides the illumination light to irradiate the detection target portion.

The light source device 100 is configured to emit illumination light, and the illumination light may be single beam light or may be combined beam light formed by combining two or more single beam light beams, which is not particularly limited in this embodiment.

The light quantity distribution modulation device 101 is configured to control the cumulative light quantity of illumination light respectively incident on each position of the input end face of the light guide device 102 in a preset period of time so as to satisfy a preset light quantity distribution requirement.

The light quantity distribution may specifically guide the ratio of the light quantity at each position of the input end surface of the light device 102. The preset light quantity distribution requirement may be any given light quantity distribution requirement, for example, it may be a light quantity distribution requirement input by a user, or may be a light quantity distribution requirement automatically determined by the system according to a feedback parameter (for example, a brightness distribution condition of an endoscopic image), which is not particularly limited in this embodiment. The cumulative light amount of the illumination light incident on each position of the input end face of the light guide device meeting the preset light amount distribution requirement means that the ratio of the cumulative light amounts of the illumination light incident on each position of the input end face of the light guide device meets the corresponding requirement. The cumulative light amount of the illumination light incident to any position within the preset time period is the sum of the light amounts of the illumination light incident to the present position at each time within the preset time period.

The light guide device 102 includes a plurality of optical fibers, where the arrangement positions of the optical fibers at the input end face of the light guide device 102 are consistent with the arrangement positions of the optical fibers at the output end face of the light guide device 102. Referring to fig. 2 for exemplary purposes, the light guide 102 shown in fig. 2 includes fourteen optical fibers, each of which is aligned at the input end surface and at the output end surface, so that the distribution of the amount of light incident on the input end surface can be conducted out of the output end surface unchanged by the optical fibers. In particular, the light guide 102 may include an imaging fiber bundle formed from a plurality of imaging fibers.

As can be seen from the foregoing, in the lighting system provided in the embodiment of the present application, the light quantity distribution modulation device 101 is controlled to make the cumulative light quantity of the lighting light respectively incident on each position of the input end face of the light guide device 102 in the preset time period meet the preset light quantity distribution requirement, and the light quantity distribution of the lighting light incident on the input end face is constantly conducted out of the output end face by the light guide device 102, so that the light quantity distribution of the lighting light output in the preset time period can be adjusted. Furthermore, when the illumination system is applied to an endoscope, differentiated dimming can be conveniently performed on each region of an endoscope image, and the imaging quality of the endoscope can be improved.

Preferably, in some embodiments, the lighting system may further comprise:

a collimator unit provided between the light source device 100 and the light quantity distribution modulation device 101, for making the illumination light emitted from the light source device 100 incident on the light quantity distribution modulation device 101 as parallel light;

and a converging unit disposed between the light quantity distribution modulation device 101 and the light guide device 102, and configured to converge the illumination light emitted from the light quantity distribution modulation device 101 and make the illumination light incident on an input end surface of the light guide device 102.

Since the light emitted from the light source device 100 is generally divergent in practical applications, if no collimating element is provided between the light source device 100 and the light quantity distribution modulation device 101, the divergent light tends to cause light energy loss during propagation. By providing a collimator unit between the light source device 100 and the light quantity distribution modulation device 101, the illumination light is made to enter the light quantity distribution modulation device 101 as parallel light, and the light passing through the light quantity distribution modulation device 101 is converged to the light guide device 102 by a converging unit, so that the light energy loss can be reduced compared with the case where the light energy loss is reduced. In addition, even when the illumination light emitted from the light source device 100 is a converging spot, the illumination light emitted from the light source device 100 is made to enter the light quantity distribution modulation device 101 as parallel light, so that the requirement for the distance between the light quantity distribution modulation device 101 and the light source device 100 can be eliminated, and the flexibility of the device layout can be improved.

In particular, the collimating assembly may comprise a lens or a prism and the converging assembly may comprise a lens or a prism.

The following is an exemplary description of a specific implementation of the light quantity distribution modulation device described in the embodiments of the present application.

Alternatively, in order to save costs, the light quantity distribution modulation device 101 may include: deflection means for changing the incident position of the illumination light on the input end face; and the control device is in communication connection with the deflection device and is used for controlling the deflection device so that the illumination light sequentially enters the input end face in the preset time period, wherein the incidence positions of the illumination light on the input end face and/or the frequencies of the illumination light entering the positions of the input end face are determined according to the preset light quantity distribution requirement.

The respective locations of incidence of the illumination light on the input end face of the light guide 102 determine the form of the illumination spot transmitted by the light guide 102. The frequency of the illumination light incident on any position of the input end face can determine the cumulative light quantity of the illumination light incident on the position of the input end face, and the greater the frequency of the illumination light incident on any position, the greater the cumulative light quantity of the illumination light incident on the position within a preset time period. Thus, controlling the respective incident positions of the illumination light on the input end face and/or controlling the frequencies of the illumination light incident on the respective positions of the input end face can make the cumulative light amounts of the illumination light respectively incident on the respective positions of the input end face in a preset period of time satisfy the preset light amount distribution requirement.

Optionally, the light quantity of the illumination light emitted by the light source device 100 is adjustable, and then the light quantity of the illumination light is determined according to the preset light quantity distribution requirement at each incident position of the input end face, the frequency of the illumination light entering each position of the input end face, and/or the light quantity of the illumination light entering each incident position.

It is understood that by adjusting the amount of illumination light emitted from the light source device 100, the amount of illumination light incident on any incident position can be controlled. Therefore, according to the preset light quantity distribution requirements, the light quantity of the illumination light at each incident position of the input end face, the frequency of the illumination light incident to each position of the input end face and/or the light quantity of the illumination light when the illumination light is incident to each incident position can be determined, so that the accumulated light quantity of the illumination light respectively incident to each position of the input end face of the light guide device 102 in a preset time period meets the preset light quantity distribution requirements, and the light quantity distribution of the illumination light irradiated to the detected part in the preset time period can be accurately controlled.

Alternatively, the adjustment of the amount of light emitted from the light source device 100 may be achieved by controlling the amount of driving current of the light source device 100.

The position of the illumination light incident on the input end face is represented by the spot position of the illumination light incident on the input end face, and the deflection device changes the incident position of the illumination light on the input end face, that is, changes the spot position of the illumination light incident on the input end face. Optionally, the diameter of the spot of the illumination light incident on the input end face is smaller than the diameter of the input end face, so that the position of the illumination light incident on the input end face can be controlled more precisely than the diameter of the spot of the illumination light incident on the input end face is larger than or equal to the diameter of the input end face, which is helpful for controlling the distribution of the light quantity input to the input end face of the light guide device 102 more precisely, and reducing the loss of the light quantity.

In this embodiment, the track of the incident position of the illumination light on the input end surface is not limited, and may be a circular track, a curved track or a straight track, or may be other forms, which are all within the scope of protection of the present application. For example, the trajectory of the illumination light at the location of incidence on the input end surface may be a circular trajectory, the center of which coincides with the center of the input end surface, which helps to form a circular spot of illumination light that is directed out by the light guide 102. Referring to fig. 3, fig. 3 is a schematic diagram of a track of an incident position of illumination light on an input end surface, where the incident position of illumination light on the input end surface 103 moves around the center of the input end surface 103, and the incident position of illumination light is represented by a position of a spot 120 of illumination light incident on the input end surface 103.

The cumulative amount of light entering each position of the input end face can be determined by the respective incidence positions of the illumination light on the input end face and the spot size of the combined illumination light on the input end face, and the cumulative amount of light entering the region of the input end face covered with the spot many times is large. For example, referring to fig. 3, when illumination light is sequentially incident on four positions of the input end face 103 and the amounts of illumination light are identical when the illumination light is incident on the respective positions, since the area a is covered twice by the spot 120 and the area B is covered only once by the spot 120, the cumulative amount of light entering the area a is larger than the cumulative amount of light entering the area B, and the ratio of the cumulative amount of light entering the area a to the cumulative amount of light entering the area B is 2:1.

In particular, the deflection device may employ a two-dimensional scanning galvanometer. Referring to fig. 4, fig. 4 is a schematic diagram of an illumination system according to another embodiment, as shown in the fig. 4, the deflection device may include an X-axis galvanometer 106 and a Y-axis galvanometer 107, parallel light emitted by the collimation component 104 sequentially enters the X-axis galvanometer 106 and the Y-axis galvanometer 107, and then is reflected by the Y-axis galvanometer 107 to the convergence component 105, where the convergence component 105 converges and enters the light guiding device 102. The control device is respectively connected with the X-axis vibrating mirror 106 and the Y-axis vibrating mirror 107 in a communication way, and the incident position of illumination light on the input end face of the light guide device 102 can be adjusted by adjusting the deflection angle of the X-axis vibrating mirror 106 and/or the Y-axis vibrating mirror 107.

Alternatively, the deflection device may employ a MEMS galvanometer, by which the incident position of the illumination light on the input face 103 is changed. Referring to fig. 5, fig. 5 is a schematic diagram of an illumination system according to yet another embodiment, and as shown, the deflection device may include a MEMS galvanometer 108 and a first reflective element 109, where the first reflective element 109 is located between the collimation assembly 104 and the MEMS galvanometer 108. The parallel light emitted from the collimator assembly 104 is incident on the first reflecting element 109, reflected to the MEMS galvanometer 108, and then reflected to the converging assembly 105. By providing a reflective element between the light source device 100 and the MEMS galvanometer 108, the optical axis of the light source device 100 and the optical axis of the light guide 102 may be substantially parallel, which may be easier to adapt or be compatible with the arrangement of other devices in the existing endoscope illumination system, reducing modifications to the existing endoscope illumination system. Of course, it is understood that in other embodiments, the first reflective element 109 could be omitted.

Alternatively, the deflection device may also employ a set of rotating prisms. Referring to fig. 6, fig. 6 is a schematic diagram of an illumination system according to another embodiment, as shown in the drawing, the deflection device includes a first prism 113 and a second prism 114, and the direction of the illumination light after passing through the deflection device is changed by rotating the first prism 113 or/and rotating the second prism 114. The parallel light emitted from the collimating assembly 104 sequentially passes through the first prism 113 and the second prism 114, and then is incident on the converging assembly 105. The control device is respectively connected with the first prism 113 and the second prism 114 in a communication way, and the incident position of illumination light on the input end face of the light guide device 102 can be adjusted through the rotation angle of the first prism 113 and/or the second prism 114.

In other embodiments, to facilitate dimming control, the light quantity distribution modulation device 101 may also include: and the spatial light modulation device is used for enabling the light quantity of the illumination light which is incident at each position of the input end face at the same time to meet the preset light quantity distribution requirement.

The spatial light modulation device can enable the light quantity of the illumination light which is incident to each position of the input end face at the same time to meet the preset light quantity distribution requirement, and the accumulated light quantity of the illumination light which is incident to any position in the preset time period is the sum of the light quantities of the illumination light which is incident to the position at each time in the preset time period, so that the spatial light modulation device can enable the accumulated light quantity of the illumination light which is incident to each position of the input end face of the light guide device 102 in the preset time period to meet the preset light quantity distribution requirement. In addition, in this embodiment, the light quantity of the illumination light emitted from the light source device 100 and the incident position of the illumination light on the input end face of the light guide device 102 can be kept unchanged, and the parameters of the spatial light modulation device can be adjusted only according to the preset light quantity distribution requirement, so that the modulation of the light quantity distribution of the output illumination light can be realized, and the dimming control becomes simpler and more convenient.

Alternatively, the spatial light modulator may employ a liquid crystal spatial light modulator. Referring to fig. 7, fig. 7 is a schematic diagram of an illumination system according to another embodiment, as shown in the drawing, parallel light emitted from the collimation component 104 is incident on the liquid crystal spatial light modulator 110, the light emitted from the liquid crystal spatial light modulator 110 is incident on the convergence component 105, and finally converged on the input end surface of the light guiding device 102 through the convergence component 105.

Alternatively, a digital micromirror spatial light modulator (Digital Micromirror Device, DMD) may also be employed as the spatial light modulator device. Preferably, the light quantity distribution modulation device 101 may further include a second reflection element disposed between the light source device 100 and the dmd. Referring to fig. 8, fig. 8 is a schematic diagram of an illumination system according to another embodiment, as shown in the fig. 8, parallel light emitted from the collimating component 104 is incident on the second reflecting element 112, reflected by the second reflecting element 112 to the dmd 111, and the modulated light is incident on the converging component 105, and finally converged on the input end surface of the light guiding device 102 through the converging component 105. By providing a reflective element between the light source device 100 and the dmd 111, the optical axis of the light source device 100 and the optical axis of the light guide 102 may be substantially parallel, which may be easier to adapt or to accommodate the arrangement of other devices in an existing endoscope illumination system, reducing modifications to the existing endoscope illumination system. It will also be appreciated that in some embodiments, the second reflective element 112 may also be omitted.

Accordingly, the present embodiment also provides an endoscope comprising an imaging system and an illumination system as described in any of the embodiments above.

In the endoscope of the present embodiment, the illumination system can adjust the light quantity distribution of the illumination light output in the preset period by controlling the light quantity distribution modulation device 101 so that the cumulative light quantity of the illumination light respectively incident on the respective positions of the input end face of the light guide device 102 in the preset period satisfies the preset light quantity distribution requirement, and by guiding the light quantity distribution incident on the input end face out of the output end face by the light guide device 102 unchanged. Therefore, the endoscope of the embodiment can perform differential dimming on each area of the endoscope image within the exposure time of the imaging system, so that the imaging quality of the endoscope is improved.

Correspondingly, the present embodiment also provides a dimming method applied to the endoscope as described above, please refer to fig. 9, fig. 9 is a flowchart of the dimming method provided in the present embodiment, and the dimming method includes the following steps:

s200: the light quantity distribution requirements are determined.

S201: and the light quantity distribution modulation device enables the accumulated light quantity of the illumination light respectively incident to each position of the input end surface of the light guide device to meet the light quantity distribution requirement in the next exposure time period of the imaging system.

The illumination system controls the accumulated light quantity of the illumination light which is incident to each position of the input end face of the light guide device in a corresponding time period through the light quantity distribution modulation device, wherein the corresponding time period corresponds to the next exposure time period of the imaging system, so that the accumulated light quantity of the illumination light which is respectively incident to each position of the input end face of the light guide device in the next exposure time period of the imaging system meets the light quantity distribution requirement. So that the distribution of the quantity of the illumination light output to the detected part by the illumination system in the next exposure period of the imaging system meets the requirement.

Specifically, determining the light quantity distribution requirement includes: and determining the light quantity distribution requirement according to the spatial brightness distribution condition of the image currently output by the imaging system.

Alternatively, the currently output image may be divided into a plurality of areas, and the brightness of each area of the image may be determined to determine the light quantity distribution requirement. For example, according to the currently output image of the imaging system, the brightness of the area C in the image is darker, so that the imaging is unclear, and the brightness of illumination irradiated to the detection area corresponding to the area C can be properly increased; the overexposure phenomenon occurs in the region D in the image, so that the illumination brightness of the detection region corresponding to the region D can be appropriately reduced.

Optionally, for any region of the image, if the brightness of the region is greater than the first threshold, the region is considered to be over-exposed, and the brightness of the illumination light irradiated to the detection region corresponding to the region is appropriately reduced correspondingly. If the brightness of the area is smaller than the second threshold value, the brightness of the illumination irradiated to the detection area corresponding to the area is appropriately increased correspondingly.

As can be seen from the foregoing embodiments, the dimming method provided by the present embodiment can perform differential dimming for each region of the endoscope image, which is beneficial to improving the imaging quality of the endoscope.

The lighting system, the endoscope and the dimming method thereof provided by the application are described in detail above. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.

Claims (15)

1. An illumination system comprising a light source device, a light guide device, and a light quantity distribution modulation device:

the light source device is used for emitting illumination light;

the light guide device comprises a plurality of optical fibers, and the arrangement positions of the optical fibers on the input end face of the light guide device are consistent with the arrangement positions of the optical fibers on the output end face of the light guide device;

the light quantity distribution modulation device is arranged between the light source device and the light guide device and is used for controlling the accumulated light quantity of illumination light respectively entering each position of the input end face of the light guide device in a preset time period so as to meet the preset light quantity distribution requirement.

2. A lighting system as recited in claim 1, further comprising:

a collimator unit provided between the light source device and the light quantity distribution modulator, and configured to allow the illumination light emitted from the light source device to enter the light quantity distribution modulator as parallel light;

and the converging component is arranged between the light quantity distribution modulation device and the light guide device and is used for converging the illumination light emitted by the light quantity distribution modulation device and making the illumination light enter the input end face of the light guide device.

3. The illumination system according to claim 2, wherein the light quantity distribution modulation device includes:

deflection means for changing the incident position of the illumination light on the input end face;

and the control device is in communication connection with the deflection device and is used for controlling the deflection device so that the illumination light sequentially enters the input end face in the preset time period, wherein the incidence positions of the illumination light on the input end face and/or the frequencies of the illumination light entering the positions of the input end face are determined according to the preset light quantity distribution requirement.

4. A lighting system according to claim 3, wherein the amount of the illumination light emitted from the light source device is adjustable, and the illumination light is determined according to the preset light amount distribution requirement at each incident position of the input end face, the frequency at which the illumination light is incident to each position of the input end face, and/or the amount of the illumination light when the illumination light is incident to each incident position.

5. A lighting system as recited in claim 3, wherein a diameter of a spot of said illumination light incident on said input end face is smaller than a diameter of said input end face.

6. A lighting system as claimed in claim 3, characterized in that the deflection means comprise a two-dimensional scanning galvanometer or a set of rotating prisms.

7. A lighting system as recited in claim 3, wherein said deflection device comprises a MEMS galvanometer.

8. The illumination system of claim 7, wherein the deflection device further comprises a first reflective element positioned between the collimation assembly and the MEMS galvanometer.

9. The illumination system according to claim 1 or 2, wherein the light quantity distribution modulation device comprises: and the spatial light modulation device is used for enabling the light quantity of the illumination light which is incident at each position of the input end face at the same time to meet the preset light quantity distribution requirement.

10. An illumination system as recited in claim 9, wherein said spatial light modulator device comprises a liquid crystal spatial light modulator.

11. The illumination system of claim 9, wherein the spatial light modulation device comprises a digital micromirror spatial light modulator.

12. The illumination system of claim 11, wherein the light quantity distribution modulation device further comprises a second reflective element disposed between the light source device and the dmd.

13. An endoscope comprising an imaging system and an illumination system according to any one of claims 1 to 12.

14. A dimming method applied to the endoscope as set forth in claim 13, comprising:

determining a light quantity distribution requirement;

and the light quantity distribution modulation device enables the accumulated light quantity of the illumination light respectively incident to each position of the input end surface of the light guide device to meet the light quantity distribution requirement in the next exposure time period of the imaging system.

15. A dimming method as claimed in claim 14, wherein the determining a light quantity distribution requirement comprises:

and determining the light quantity distribution requirement according to the spatial brightness distribution condition of the image currently output by the imaging system.

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