Paperless conference management system based on cloud platform

Abstract

The invention provides a paperless conference management system based on a cloud platform, and relates to the technical field of conference information management.The paperless conference management system comprises the steps that visual parameters such as the pupil light reflection rate and the pupil adaptation time of a user are collected, and a dynamic light adaptation curve is generated in combination with the brightness contrast of a conference environment; the curves are pushed to conference equipment through a cloud platform, so that customized screen brightness adjustment is realized; a personalized light adaptation scheme is provided according to the visual sensitivity index of the user, and meanwhile, the overall visual coordination in a multi-user environment is emphasized; therefore, not only is the conference experience optimized, but also the transient reading disorder caused by the light adaptation lag is obviously reduced, and the definition of information presentation and the fluency of the conference are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of conference information management, and in particular to a paperless conference management system based on a cloud platform. Background Art

[0002] In a paperless conference room environment, traditional paperless conference systems usually rely on fixed brightness adjustment and ambient light perception, using manual or simple light sensing to adjust the screen brightness to cope with changes in ambient light. With the rapid switching of light and dark environments between the lecture area and the auditorium, the user's visual system is limited by the delayed adaptability of light brightness changes. Existing equipment usually only adjusts the screen brightness in real time after the switch, ignoring the adaptability of the user's vision, causing users to face temporary reading difficulties when the light switches. However, this method often cannot accurately adapt to the visual differences of each user, nor can it cope with the complex and changeable lighting environment and the visual needs of different users in the meeting, resulting in users facing problems such as delayed visual adaptation and excessive brightness contrast during the meeting. In severe cases, it may even cause visual fatigue, lack of concentration and other adverse effects.

[0003] In the prior art, the announcement number is CN108092786B, and the name is a paperless conference management method and system, which includes: obtaining the identity information input by the user and verifying the identity of the user; when the identity authentication of the user is passed, outputting and displaying the corresponding conference management operation interface to the user; obtaining the operation request initiated by the user in the conference management operation interface, and executing the corresponding conference operation. The above scheme can realize the centralized and unified management of paperless conferences.

[0004] Although some brightness adjustment technologies based on ambient light sensing have been applied in conference equipment, such as automatic brightness adjustment and backlight adjustment, most of these technologies only adjust according to the intensity of ambient light or the brightness difference of the screen, and fail to take into account the differences in visual adaptability of different users under different lighting conditions. For example, when the screen brightness of the conference equipment has a large contrast with the ambient light background, the user's visual adaptation time may be delayed, resulting in visual discomfort. In addition, the existing brightness adjustment system is usually unable to dynamically adjust the screen brightness of each user, and cannot make corresponding personalized adaptation to the differences in visual sensitivity in multi-user scenarios. For users, the brightness contrast during the light switching process (such as switching from dark to bright light) can cause temporary visual impairment, which in turn affects the fluency and accuracy of information acquisition. Therefore, the existing technology still has obvious deficiencies in dealing with visual adaptation problems, especially in dynamic light adaptation and precise adjustment of user personalized needs.

[0005] The above information disclosed in the above Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a paperless conference management system based on a cloud platform to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A paperless conference management system based on a cloud platform, specifically including:

[0009] Ambient light parameter acquisition module: used to obtain the ambient light parameters of the current conference environment, the ambient light parameters including: the ambient background brightness of each conference device and the brightness difference range between the screen and the ambient background;

[0010] The maximum difference in the brightness difference range is defined as brightness contrast, which is used to describe the change in light intensity when the light is switched;

[0011] User visual parameter acquisition and analysis module: used to obtain the user visual parameters of the user under the corresponding conference device under the current brightness contrast, and the user visual parameters include: user pupil light reflection rate and user pupil adaptation time;

[0012] The user's pupil light reflection rate and the user's pupil adaptation time are combined and analyzed to generate a visual sensitivity index, where the visual sensitivity index is used to characterize the sensitive response of light switching to the user's vision;

[0013] Upload the user visual parameters of the users corresponding to each conference device to the cloud platform for storage;

[0014] Multi-dimensional light adaptation curve generation module: obtains user visual parameters and ambient light parameters, and generates a dynamic light adaptation curve on the cloud platform;

[0015] Dynamic light adaptation implementation module: used to push the corresponding dynamic light adaptation curve to each conference device through the cloud platform. The conference device end executes the screen brightness adjustment strategy according to the dynamic light adaptation curve.

[0016] Furthermore, the ambient light parameter acquisition module specifically includes:

[0017] Multiple conference devices are uniquely labeled using the set {1, 2, ..., j, ..., M}, where j represents the index of the jth conference device and M represents the total number of conference devices; and each conference device is associated and paired with a corresponding user;

[0018] The ambient background brightness of the jth conference device is recorded as Benv,j ;

[0019] The brightness difference between the screen of the jth conference device and the ambient background is recorded as [B j,min ,B j,max ];

[0020] B j,min It is the minimum brightness difference between the screen and the ambient background;

[0021] B j,max It is the maximum value of the brightness difference between the screen and the ambient background;

[0022] Define the brightness contrast of the jth conference device as ΔB j , ΔB j Used to describe the change in light intensity when switching photos; ΔB j The calculation formula is ΔB j =B j,max -B j,min .

[0023] Furthermore, the user visual parameter collection and analysis module specifically includes:

[0024] The user pupil light reflection rate collected in real time by the jth conference device and the user pupil adaptation time are recorded as ΔP j and T pj ;

[0025] The visual sensitivity index of the user paired with the jth conference device is recorded as S vj ;

[0026] In the brightness difference range of the jth conference device [B j,min ,B j,max ], by simulating the light intensity change of multi-level light switching, that is, dynamically adjusting the light level of screen brightness, the user's pupil light reflection rate and the user's pupil adaptation time are monitored under the light intensity change of each level of light switching;

[0027] And in the light intensity change of multi-level light switching, determine the comfortable brightness difference range that the user corresponding to the current j-th conference device can accept, recorded as [B1 j ,B2 j ]; B1 j and B2 j Respectively represent the minimum and maximum values ​​of the comfortable brightness difference range; and [B1 j ,B2 j ] included in [B j,min ,B j,max ];

[0028] Definition of Visual Sensitivity Index S vj The calculation formula is as follows:

[0029]

[0030] Among them, α and β are weight parameters, the values ​​of α and β are both in the interval (0,1), and α+β=1;

[0031] S vj The larger the value, the higher the user's sensitivity to light switching.

[0032] Furthermore, the multi-dimensional light adaptation curve generation module specifically includes:

[0033] The dynamic light adaptation curve of the jth conference device is represented as L adapt (t) j , L adapt (t) j The generation steps are:

[0034] 1.1) Take the ambient background brightness of the jth conference device as the reference brightness L baseline,j ; That is L baseline,j =B env,j ;

[0035] 1.2) Create a brightness transition function for the jth conference device:

[0036]

[0037] Among them, λ j =f j (S vj ,ΔP j ,T pj ) represents the adjustment parameter of the light adaptation speed; t is the time variable, which represents the duration of the brightness transition process; f j It is used to express the relationship between the user's visual parameters and the light adaptation speed;

[0038] ΔB′ j It is the brightness contrast within the comfortable brightness difference range.

[0039] Furthermore, the screen brightness adjustment strategy includes the following adjustment operations:

[0040] According to the comfortable brightness difference range that the user corresponding to the jth conference device can accept [B1 j ,B2 j ], and the current ambient background brightness to determine the target screen brightness, adjust the screen brightness output of the jth conference device to the progressive brightness of each frame, and record the progressive brightness of each frame as ΔL step,j , the calculation formula is Where n is the number of frames of transition subdivision; L current,jis the current real-time screen brightness of the jth conference device, L target,j is the target screen brightness of the jth conference device.

[0041] Furthermore, the cloud platform calculates the comfortable brightness difference range that the user can accept based on the current j-th conference device [B1 j ,B2 j ], and obtain the comfortable brightness difference ranges acceptable to multiple users on both sides of the user corresponding to the current jth conference device, remove the maximum and minimum values ​​in these comfortable brightness difference ranges, and then average the remaining comfortable brightness difference ranges to obtain the average comfortable brightness difference range

[0042] based on Push brightness correction parameters to the smart lighting control device to adjust the current ambient background brightness B env,j .

[0043] Define the adjusted value of the background brightness of the environment corresponding to the jth conference device as The calculation formula is:

[0044]

[0045] γ j is the brightness correction parameter corresponding to the jth conference device; S threshold,j is the visual sensitivity threshold acceptable to the user corresponding to the jth conference device;

[0046] If γ j Less than 0 means that the user's visual sensitivity index is lower than the visual sensitivity threshold and is still within the comfortable range, and the ambient background brightness needs to be increased;

[0047] If γ j If it is greater than 0, it means that the user's visual sensitivity index exceeds the acceptable visual sensitivity threshold and the ambient background brightness needs to be reduced to reduce the visual burden.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] By collecting the user's visual parameters such as pupil light reflection rate and pupil adaptation time, combined with the brightness contrast of the conference environment, a dynamic light adaptation curve matching the user's visual sensitivity is generated, and pushed to each conference device through the cloud platform, and the screen brightness adjustment strategy is executed in real time. Unlike the prior art, the present invention can provide a customized light adaptation solution based on the visual sensitivity index of each user, while taking into account the overall visual coordination in a multi-user environment, optimizing the conference experience, significantly reducing the temporary reading impairment caused by light adaptation lag, and improving the clarity of information presentation and the fluency of the meeting. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the overall system module of the present invention. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0052] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0053] Embodiment 1:

[0054] See also Figure 1 , the present invention provides a technical solution:

[0055] A paperless conference management system based on a cloud platform is applied to paperless conference scenarios where light switching causes visual adaptation lag and temporary reading impairment, and the paperless conference scenario includes multiple conference devices with screens, specifically including:

[0056] Ambient light parameter acquisition module: A paperless conference device equipped with an ambient light sensor and an HDR camera is used to obtain the ambient light parameters of the current conference environment. The ambient light parameters include: the ambient background brightness of each conference device and the brightness difference range between the screen and the ambient background;

[0057] The ambient light sensor model is TSL2591;

[0058] The HDR camera uses the SonyIMX586 HDR camera;

[0059] The maximum difference in the brightness difference range is defined as brightness contrast, which is used to describe the change in light intensity when the light is switched;

[0060] Further explanation: The ambient light parameter acquisition module specifically includes:

[0061] Multiple conference devices are uniquely labeled using the set {1, 2, ..., j, ..., M}, where j represents the index of the jth conference device and M represents the total number of conference devices; and each conference device is associated and paired with a corresponding user; so as to achieve a one-to-one correspondence between users and conference devices;

[0062] Each conference device is equipped with an ambient light sensor and an HDR camera. The acquisition frequency of the ambient light sensor and the HDR camera is initialized to 1 Hz, where 1 Hz represents 1 Hertz.

[0063] The ambient background brightness of the jth conference device is recorded as B env,j ;

[0064] The ambient light sensor measures the ambient background brightness around the current conference equipment in real time; multiple ambient light sensors form a light sensor array, through which the ambient light intensity is sampled from multiple angles;

[0065] The multi-angle sampling settings are:

[0066] Each ambient light sensor can collect light intensity from 0° to 360° on the horizontal plane.

[0067] In the vertical direction, it is divided into at least a plurality of angles, namely 0°, 30°, and 60°; these angles are the angles between the ambient light sensor and the vertical plane of the conference device screen; 30° and 60° represent the light intensity received by the ambient light sensor at the corresponding angle, that is, the oblique ambient light distribution;

[0068] The collected data is calculated through the weighted average algorithm to obtain the ambient background brightness B of the current device. env,j :

[0069]

[0070] Where N is the number of sampling points, B env,j,k Represents the light intensity of the kth sampling point of the jth conference device.

[0071] The brightness difference between the screen of the jth conference device and the ambient background is recorded as [B j,min ,B j,max ];

[0072] B j,min It is the minimum brightness difference between the screen and the ambient background;

[0073] B j,max It is the maximum value of the brightness difference between the screen and the ambient background;

[0074]

[0075] Wherein, δ is an international standard unit for luminance, which indicates the tolerance value of luminance difference. In this embodiment, δ is 10 cd / m 2 .

[0076] cd / m 2 The full name is "Candelaper square meter". Brightness is a physical quantity that reflects the light intensity per unit area on the surface of a luminous or reflective object.

[0077] Screen brightness collection:

[0078] HDR camera measurement: Use the HDR camera to obtain the brightness distribution of the screen area of ​​the jth conference device;

[0079] Calculation of average screen brightness:

[0080]

[0081] Where G is the total number of screen grids, B screen,j,m is the screen brightness of the mth grid in the screen area of ​​the jth conference device; B screen,j is the average screen brightness of the jth conference device;

[0082] Calculate the difference between the average screen brightness and the current ambient background brightness:

[0083] Repeat the calculation of the difference for all grids and record the minimum difference B j,min and the maximum difference B j,max .

[0084] Define the brightness contrast of the jth conference device as ΔB j , ΔB j Used to describe the change in light intensity when switching light; the calculation formula for ΔBj is ΔB j =B j,max -B j,min ;

[0085] User visual parameter acquisition and analysis module: through the built-in near-infrared eye tracking module of the conference device, it is used to obtain the user visual parameters of the user under the corresponding conference device under the current brightness contrast, and the user visual parameters include: user pupil light reflection rate and user pupil adaptation time;

[0086] The user's pupil light reflection rate and the user's pupil adaptation time are combined and analyzed to generate a visual sensitivity index, where the visual sensitivity index is used to characterize the sensitive response of light switching to the user's vision;

[0087] Upload the user visual parameters of the users corresponding to each conference device to the cloud platform for storage;

[0088] Further explanation: The user visual parameter collection and analysis module specifically includes:

[0089] The user pupil light reflection rate collected in real time by the jth conference device and the user pupil adaptation time are recorded as ΔP j and T pj ;

[0090] The visual sensitivity index of the user paired with the jth conference device is recorded as S vj ;

[0091] In the brightness difference range of the jth conference device [B j,min ,B j,max ], by simulating the light intensity change of multi-level light switching, that is, dynamically adjusting the light level of screen brightness, the user's pupil light reflection rate and the user's pupil adaptation time are monitored under the light intensity change of each level of light switching;

[0092] And in the light intensity change of multi-level light switching, determine the comfortable brightness difference range that the user corresponding to the current j-th conference device can accept, recorded as [B1 j ,B2 j ]; B1 j and B2 j Respectively represent the minimum and maximum values ​​of the comfortable brightness difference range; and [B1 j ,B2 j ] included in [B j,min ,B j,max ];

[0093] The specific implementation contents of the above contents are as follows:

[0094] The basic principle of the near-infrared eye tracking module is as follows:

[0095] Infrared light source and reflection:

[0096] Eye tracking systems use invisible near-infrared light to illuminate the eyes.

[0097] Near-infrared light hits the pupil and retina of the eye, and some of the light is reflected.

[0098] Pupil and corneal reflex:

[0099] Near-infrared eye tracking modules place a camera or sensor near the eye area to capture reflected light.

[0100] The eye's gaze direction is determined using geometric calculations by detecting the pupil center and the corneal reflection point (commonly called a "bright spot" or "corneal reflection").

[0101] Calculate pupil diameter and gaze point:

[0102] The position of the pupil is accurately identified, and combined with the geometric relationship of the reflection points, the system algorithm calculates the rotation angle and gaze point of the eyeball. This system algorithm is built into the near-infrared eye tracking module and will not be described in detail.

[0103] 2.1) Hardware device initialization:

[0104] The near-infrared eye tracking module built into each conference device includes two functional nodes:

[0105] Pupil contour detection node: captures the changes in the user's pupil shape in real time;

[0106] Infrared Reflection Node: Get pupil contraction data under different light intensity conditions.

[0107] Initialize the device light source and calibrate the near-infrared sensor to ensure that the infrared light source's measurement accuracy of pupil morphology meets the accuracy error range of ±0.01mm.

[0108] 2.2) Sensor calibration:

[0109] Perform periodic self-calibration on each conference device in a darkroom environment without external interference, including:

[0110] Check the light intensity range of the conference equipment light source to ensure that it meets the controllable range of the light source brightness (for example, 10 to 500, in cd / m 2 );

[0111] Calibrate the projection accuracy and sampling error of the near-infrared eye tracking module to ensure the stability of pupil size measurement.

[0112] 2.3) Environmental parameter initialization:

[0113] Get the current ambient background brightness from the ambient light sensor, denoted as B env,j , and the average screen brightness B of the jth conference device screen,j Commonly used for setting the light switching range.

[0114] 3.1) Start user identification:

[0115] Enable the near-infrared eye tracking module of the conference device, establish a dynamic binding relationship between "user pupil-conference device number", and ensure that the user's visual parameters are bound and stored with the corresponding conference device j.

[0116] 3.2) Get the brightness difference range:

[0117] Get the brightness difference range of the jth conference device and set it as [B j,min ,B j,max ]:

[0118] 3.3) User pupil light reflection rate ΔP j Collection of:

[0119] Simulate the rapid change of ambient light switching and screen brightness, and set the brightness contrast of each light switching level to ΔB level , each level of brightness contrast ΔB level After switching, the user's pupil light reflection rate ΔP is recorded in real time j :

[0120]

[0121] Where, ΔD j is the change in pupil diameter of the user corresponding to the jth conference device (unit: mm);

[0122] Δt is the pupil reaction time (unit: ms).

[0123] At each light switching level, the pupil reflex response to light was recorded.

[0124] 3.4) For the user's pupil adaptation time T pj Collection of:

[0125] Measure the time from when the user's pupil starts to adapt to the light change to when the pupil is fully adapted (i.e., the time it takes for the pupil to contract or dilate), recorded as T pj , unit is ms.

[0126] Definition of Visual Sensitivity Index S vj The calculation formula is as follows:

[0127]

[0128] Wherein, α and β are weight parameters, and the values ​​of α and β are both in the interval (0,1), and α+β=1; α and β are determined by the entropy weight method and the fuzzy analytic hierarchy process (FAHP) for corresponding weights; in this embodiment, the values ​​of α and β are 0.4 and 0.6 respectively;

[0129] S vj The larger the value, the higher the user's sensitivity to light switching.

[0130] The multi-level optical switching experiment is defined as follows:

[0131] In the brightness difference range of the jth conference device [B j,min ,B j,max ], based on the brightness contrast ΔB of each light switching level , simulate the brightness difference under different light switching conditions, and record the visual sensitivity index S shown by the user in the experiment vj Fluctuations;

[0132] Extract the comfortable brightness difference range that users can accept:

[0133] [B1 j ,B2 j ]={B x |S vj (B x )≤S threshold,j}

[0134] S threshold,j B is the visual sensitivity threshold acceptable to the user corresponding to the jth conference device; x is a candidate difference between the screen brightness and the ambient background brightness, used to evaluate the user's visual comfort under this brightness difference;

[0135] S vj (B x ) is the brightness difference B x The user's visual system's sensitivity to light switching under the condition of

[0136] In the step-by-step increase of brightness contrast ΔB level Under the condition, the user gradually experiences different levels of brightness changes; when the user marks the unacceptable maximum brightness contrast, the previous level of the brightness contrast is recorded as the acceptable limit; the visual sensitivity index corresponding to the accumulated value of the brightness contrast of this acceptable limit is set as S threshold,j ;

[0137] Judgment [B1 j ,B2 j ] is included in [B j,min ,B j,max ]; if not included, adjust the screen brightness or ambient light to ensure compatibility.

[0138] Multi-dimensional light adaptation curve generation module: obtains user visual parameters and ambient light parameters, and generates a dynamic light adaptation curve on the cloud platform;

[0139] Further explanation: The multi-dimensional light adaptation curve generation module specifically includes:

[0140] The dynamic light adaptation curve of the jth conference device is represented as L adapt (t) j , L adapt (t) j The generation steps are:

[0141] 1.1) Take the ambient background brightness corresponding to the jth conference device as the reference brightness L baseline,j ; That is L baseline,j =B env,j ;

[0142] 1.2) Create a brightness transition function for the jth conference device:

[0143]

[0144] Among them, λ j =f j (S vj ,ΔP j ,T pj ) represents the adjustment parameter of the light adaptation speed; the light adaptation speed is determined according to the dynamic changes of the user's visual parameters; t is a time variable, indicating the duration of the brightness transition process; f j It is used to express the relationship between the user's visual parameters and the light adaptation speed; f j The function is obtained by training through regression model or machine learning method;

[0145] Define f j The calculation formula is as follows:

[0146]

[0147] Among them, b1, b2 and b3 are empirical adjustment parameters obtained by calibration of experimental data, b1+b2+b3=1, and the values ​​of b1, b2 and b3 are all in the interval (0,1); b1, b2 and b3 are determined by the entropy weight method and the fuzzy analytic hierarchy process (FAHP) for corresponding weights; in this embodiment, the values ​​of b1, b2 and b3 are 0.4, 0.3 and 0.3 respectively.

[0148] ΔB′ j It is the brightness contrast within the comfortable brightness difference range. It makes the dynamic light adaptation curve approach the user's comfortable brightness;

[0149] Dynamically generate light adaptation curves:

[0150] Before starting a meeting, the system will dynamically generate an adaptive light adaptation curve based on each user's visual parameters and ambient light data.

[0151] Over time, the system will adjust the dynamic light adaptation curve based on the user's visual feedback (continuously collected through the near-infrared eye tracking module) to ensure the user's visual comfort throughout the meeting.

[0152] Real-time adjustments:

[0153] During a meeting, the user's visual parameters change (for example, after using the device for a long time, the user's visual fatigue increases). Therefore, the system needs to obtain the user's visual change data in real time through the cloud platform and fine-tune the light adaptation curve to ensure that the lighting matches the user's needs.

[0154] Storage of light adaptation curves:

[0155] Dynamic light adaptation curve L for each user and device adapt (t) j It will be stored in the cloud platform to form a user-personalized optical adaptation database.

[0156] Through the cloud platform, conference administrators can view the light adaptation data of each user and evaluate the visual comfort of the conference environment.

[0157] Curve sharing and tuning:

[0158] In future meetings, the system will automatically load the user's historical light adaptation curve based on previously stored data and quickly enter the light adaptation state that best suits the user.

[0159] Dynamic light adaptation implementation module: used to push the corresponding dynamic light adaptation curve to each conference device through the cloud platform. The conference device executes the screen brightness adjustment strategy according to the dynamic light adaptation curve;

[0160] Further explanation: The screen brightness adjustment strategy includes the following adjustment operations:

[0161] The cloud platform pushes the corresponding dynamic light adaptation curve L to the jth conference device through a secure and stable network connection. adapt (t) j ;

[0162] According to the comfortable brightness difference range that the user corresponding to the jth conference device can accept [B1 j ,B2 j ], and the current ambient background brightness to determine the target screen brightness, adjust the screen brightness output of the jth conference device to the progressive brightness of each frame, and record the progressive brightness of each frame as ΔL step,j , the calculation formula is Where n is the number of frames of transition subdivision; L current,j is the current real-time screen brightness of the jth conference device, L target,j is the target screen brightness of the jth conference device;

[0163] For the jth conference device, according to the comfortable brightness difference range generated by the user visual parameter acquisition and analysis module [B1 j ,B2 j ] and the current ambient background brightness B env,j , determine the target screen brightness L target,j .

[0164] The screen brightness needs to be adjusted according to the ambient background brightness to avoid excessive visual contrast; the higher the ambient background brightness, the higher the screen brightness required;

[0165] In a brightly lit conference room, the screen appears dim if the screen brightness is the same as or lower than the ambient background brightness.

[0166] In a darker room, the screen brightness is slightly higher than the ambient background brightness, which can enhance the clarity of text and images.

[0167] Therefore, the target screen brightness calculation formula is as follows:

[0168]

[0169] Through the screen control module of the conference device, the current real-time screen brightness L of the jth conference device is obtained in real time. current,j , ensuring accurate reference values ​​during the adjustment process.

[0170] If L target,j If the screen brightness exceeds the upper limit of the current conference device (the upper limit of the screen brightness of the conference device is determined based on the hardware facilities), the background brightness of the environment is changed to reduce B env,j ;

[0171] The total number of frames n during the transition process is set according to the conference device refresh rate and light adaptation requirements. In this embodiment, if it is desired to complete the brightness adjustment within 2 seconds and the device refresh rate is 60 Hz, then n=120 frames.

[0172] After receiving and parsing the light adaptation curve, the screen control module of the conference device adjusts the light according to the pre-calculated ΔL. step,j , progressively adjust the real-time screen brightness L in each frame current,j :

[0173] L current,j (t+1)=L current,j (t)+ΔL step,j

[0174] Among them, L current,j (t) and L current,j (t+1) represents the real-time screen brightness adjustment from time variable t to t+1;

[0175] During the adjustment process, the device continuously monitors the current screen brightness to ensure that adjustments are made according to the predetermined curve.

[0176] The cloud platform calculates the comfortable brightness difference range that the user can accept based on the current j-th conference device [B1 j ,B2 j ], and obtain the comfortable brightness difference ranges acceptable to multiple users on both sides of the user corresponding to the current jth conference device, remove the maximum and minimum values ​​in these comfortable brightness difference ranges, and then average the remaining comfortable brightness difference ranges to obtain the average comfortable brightness difference range

[0177] Get the comfortable brightness difference range of adjacent users:

[0178] The cloud platform collects the comfortable brightness difference range of multiple users on both sides of the jth conference device corresponding to the user [B1 j1 ,B2 j1 ], where j1 is the user corresponding to the adjacent conference device number, and j1∈{1,2,…,M};

[0179] Remove extreme values:

[0180] From the collected comfortable brightness difference range, the maximum and minimum values ​​of the comfortable brightness difference are removed to avoid the influence of extreme data on the overall adjustment.

[0181] Calculate the average comfortable brightness difference range

[0182] The remaining comfortable brightness difference range is averaged:

[0183]

[0184] Wherein, m′ is the number of adjacent users after removing extreme values, m′<M.

[0185] based on Push brightness correction parameters to the smart lighting control device to adjust the current ambient background brightness B env,j ; By synchronously adjusting the screen brightness and ambient background light, the excessive burden of brightness contrast on the user's vision is reduced.

[0186] Define the adjusted value of the background brightness of the environment corresponding to the jth conference device as The calculation formula is:

[0187]

[0188] γ j is the brightness correction parameter corresponding to the jth conference device;

[0189] After receiving the brightness correction parameters, the intelligent lighting control device automatically adjusts the brightness of the ambient light source to ensure the coordination of the ambient background brightness and the screen brightness, thus reducing the visual contrast burden;

[0190] If γ j Less than 0 means that the user's visual sensitivity index is lower than the visual sensitivity threshold and is still within the comfortable range, and the ambient background brightness needs to be increased;

[0191] If γ jIf it is greater than 0, it means that the user's visual sensitivity index exceeds the acceptable visual sensitivity threshold and the ambient background brightness needs to be reduced to reduce the visual burden.

[0192] If γ j If it is equal to 0, it means that the user's visual sensitivity index is equal to the visual sensitivity threshold that he can accept, and there is no need to adjust the ambient background brightness;

[0193] The brightness correction parameter γ j Converted into control instructions recognizable by lighting equipment and sent through intelligent lighting control equipment. The specific conversion into control instructions recognizable by lighting equipment using dimming control protocol or signal mapping method is not described in detail here;

[0194] After receiving the brightness correction parameters, the intelligent lighting control device automatically adjusts the light output according to the internal control algorithm to adjust the brightness of the ambient light source to

[0195] This embodiment not only adjusts the screen brightness based on the visual parameters of a single user, but also achieves a balance in the visual comfort of multiple users by collectively optimizing the ambient light, and is suitable for a multi-person conference environment.

[0196] By synchronously adjusting the screen brightness and ambient background light, visual contrast is significantly reduced, visual fatigue caused by excessive lighting changes is prevented, and the overall user experience is improved, which is different from the traditional method of only adjusting the screen brightness.

[0197] Embodiment 2:

[0198] Further explanation based on Example 1:

[0199] In order to verify the effectiveness of the "dynamic light adaptation implementation module" and its advantages in optimizing the conference experience, a series of experiments were designed. The experimental environment is a standardized multi-user conference room equipped with five smart conference devices (numbered 1 to 5), each of which is connected to the cloud platform to push and execute the dynamic light adaptation curve.

[0200] Test preparation content:

[0201] 1. Equipment configuration:

[0202] Conference equipment: Five intelligent conference devices, supporting dynamic brightness adjustment and synchronous control of ambient light.

[0203] Cloud platform: Deploy a dynamic light adaptation module that can generate and push light adaptation curves based on user visual parameters.

[0204] Ambient light source: LED lighting system with adjustable brightness and supports intelligent control.

[0205] 2. User parameter collection:

[0206] Visual parameters such as the user's pupil light reflection rate and the user's pupil adaptation time are collected through professional equipment to ensure the accuracy of the data.

[0207] The comfortable brightness difference range for each user [B1 j1 ,B2 j1 ]After analysis.

[0208] 3. Experimental subjects:

[0209] Five representative conference participants were selected, corresponding to five conference devices respectively, to ensure the diversity and coverage of the experimental data.

[0210] Detailed implementation process:

[0211] 1. Parameter collection and analysis:

[0212] Conduct visual parameter tests on each user to determine their comfortable brightness difference range [B1 j1 ,B2 j1 ].

[0213] In this embodiment, the comfortable brightness difference range for user 1 is [300, 500], and the comfortable brightness difference range for user 2 is [350, 550].

[0214] 2. Dynamic light adaptation curve generation and push:

[0215] The cloud platform generates a personalized dynamic light adaptation curve L according to the comfortable brightness difference range of each conference device corresponding to the user and the current ambient background brightness. adapt (t) j .

[0216] The curve is pushed to each conference device through a secure and stable network connection.

[0217] 3. Screen brightness adjustment strategy execution:

[0218] After each conference device receives the curve, it calculates the target screen brightness L target,j :

[0219] The total number of transition frames n is determined (for example, if the transition is completed within 2 seconds and the refresh rate is 60 Hz, then n=120).

[0220] Calculate the step size ΔL of the progressive brightness of each frame step,j :

[0221]

[0222] The device adjusts the screen brightness frame by frame based on the calculation results and monitors the adjustment process in real time to ensure that it is consistent with the predetermined curve.

[0223] 4. Adjustment of ambient background brightness:

[0224] The cloud platform collects the comfortable brightness difference range of adjacent users, removes extreme values ​​and calculates the average comfortable brightness difference range

[0225] Calculate the new ambient background brightness

[0226] Smart lighting control device reception j After that, the brightness of the ambient light source is automatically adjusted to ensure that the ambient background brightness is coordinated with the screen brightness.

[0227] 5. Data recording and analysis:

[0228] During the experiment, the real-time screen brightness L of each conference device was recorded. current,j 、Target screen brightness L target,j , Ambient background brightness, New ambient background brightness And the step size of the progressive brightness ΔL step,j .

[0229] Personalized light adaptation: Customized brightness adjustment based on each user's visual parameters improves the user's visual comfort.

[0230] Multi-user coordination: By collectively optimizing the ambient light, the visual needs of multiple users are balanced, avoiding the conflicts that may be caused by a single adjustment.

[0231] Real-time monitoring and adjustment: The device continuously monitors the screen brightness to ensure accurate and smooth adjustment, reducing the impact of light adaptation lag.

[0232] Intelligent cloud platform: Utilizing the computing and push capabilities of the cloud platform, efficient dynamic light adaptation is achieved, with good scalability and flexibility.

[0233] The above experiments have verified the advantages of the present invention in significantly optimizing the visual experience, improving the clarity of information presentation and the fluency of the conference in a multi-user conference environment.

[0234] The following table records the key parameters of five conference devices during the dynamic light adaptation process. The data reflects the innovation and advantages of the present invention in terms of personalized brightness adjustment and synchronous control of ambient light.

[0235] Table 1 Dynamic light adaptation implementation module experiment:

[0236]

[0237]

[0238] Data Analysis:

[0239] It can be seen from the table that, through the dynamic light adaptation implementation module of the present invention, each conference device can achieve accurate screen brightness adjustment and simultaneously optimize the ambient background brightness. 2 Adjust to 400cd / m 2 , ambient background brightness from 350cd / m 2 Adjust to 450cd / m 2 The step size of the progressive brightness is 1.25cd / m 2 / frame, where "frame" represents "frame"; it ensures a smooth transition within 2 seconds (120 frames) and avoids visual fatigue.

[0240] From the above data, it can be clearly seen that the present invention has significant advantages in personalized brightness adjustment, multi-user coordinated control and real-time monitoring adjustment, which significantly improves the visual comfort of the conference experience and the clarity of information presentation.

[0241] Through the above description of the implementation method, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccessMemory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0242] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0243] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0244] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0245] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0246] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A paperless conference management system based on a cloud platform, applied to a paperless conference scene where light switching causes visual adaptation lag and temporary reading impairment, and the paperless conference scene includes multiple conference devices with screens, characterized in that: Specifically include: Ambient light parameter acquisition module: used to obtain the ambient light parameters of the current conference environment, the ambient light parameters including: the ambient background brightness of each conference device and the brightness difference range between the screen and the ambient background; The maximum difference in the brightness difference range is defined as brightness contrast, which is used to describe the change in light intensity when the light is switched; User visual parameter acquisition and analysis module: used to obtain the user visual parameters of the user under the corresponding conference device under the current brightness contrast, and the user visual parameters include: user pupil light reflection rate and user pupil adaptation time; The user's pupil light reflection rate and the user's pupil adaptation time are combined and analyzed to generate a visual sensitivity index, where the visual sensitivity index is used to characterize the sensitive response of light switching to the user's vision; Upload the user visual parameters of the users corresponding to each conference device to the cloud platform for storage; Multi-dimensional light adaptation curve generation module: obtains user visual parameters and ambient light parameters, and generates a dynamic light adaptation curve on the cloud platform; Dynamic light adaptation implementation module: used to push the corresponding dynamic light adaptation curve to each conference device through the cloud platform. The conference device end executes the screen brightness adjustment strategy according to the dynamic light adaptation curve.

2. A paperless conference management system based on a cloud platform according to claim 1, characterized in that: The ambient light parameter acquisition module includes: Multiple conference devices are uniquely labeled using the set {1, 2, ..., j, ..., M}, where j represents the index of the jth conference device and M represents the total number of conference devices; and each conference device is associated and paired with a corresponding user; The ambient background brightness of the jth conference device is recorded as Benv,j; The brightness difference between the screen of the jth conference device and the ambient background is recorded as [Bj,min,Bj,max]; Bj,min is the minimum value of the brightness difference between the screen and the ambient background; Bj,max is the maximum value of the brightness difference between the screen and the ambient background; The brightness contrast of the j-th conference device is defined as ΔBj, where ΔBj is used to describe the light intensity change of light switching; the calculation formula of ΔBj is ΔBj=Bj,max-Bj,min.

3. A paperless conference management system based on a cloud platform according to claim 2, characterized in that: The user visual parameter collection and analysis module specifically includes: The user pupil light reflection rate and the user pupil adaptation time collected in real time by the jth conference device are recorded as ΔPj and Tpj respectively; The visual sensitivity index of the user paired with the jth conference device is recorded as Svj; Under the brightness difference range [Bj,min,Bj,max] of the jth conference device, by simulating the light intensity change of multi-level light switching, the user's pupil light reflection rate and the user's pupil adaptation time are monitored under the light intensity change of each level of light switching; And in the light intensity change of multi-level light switching, determine the comfortable brightness difference range that the user corresponding to the current j-th conference device can accept, recorded as [B1j, B2j]; B1j and B2j represent the minimum and maximum values ​​of the comfortable brightness difference range respectively; and [B1j, B2j] is included in [Bj, min, Bj, max]; The calculation formula of visual sensitivity index Svj is defined as follows: Among them, α and β are weight parameters, the values ​​of α and β are both in the interval (0,1), and α+β=1; The larger the Svj value is, the higher the user's sensitivity to optical switching is.

4. A paperless conference management system based on a cloud platform according to claim 3, characterized in that: The multi-dimensional light adaptation curve generation module specifically includes: The dynamic light adaptation curve of the jth conference device is represented as Ladapt(t)j, and the generation steps of Ladapt(t)j are: 1.1) The ambient background brightness corresponding to the j-th conference device is taken as the baseline brightness Lbaseline,j; that is, Lbaseline,j = Benv,j; 1.2) Create a brightness transition function for the jth conference device: Wherein, λj=fj(Svj,ΔPj,Tpj) represents the adjustment parameter of the light adaptation speed; t is a time variable, which represents the duration of the brightness transition process; fj is used to represent the relationship between the user's visual parameters and the light adaptation speed; ΔB′j is the brightness contrast within the comfortable brightness difference range.

5. A paperless conference management system based on a cloud platform according to claim 4, characterized in that: Screen brightness adjustment strategy, including the following adjustment operations: According to the comfortable brightness difference range [B1j, B2j] that the user corresponding to the j-th conference device can accept and the current ambient background brightness, the target screen brightness is determined, and the screen brightness output of the j-th conference device is adjusted to the progressive brightness of each frame, and the progressive brightness of each frame is recorded as ΔLstep,j. The calculation formula is: Where n is the number of frames of transition subdivision; Lcurrent,j is the current real-time screen brightness of the j-th conference device, and Ltarget,j is the target screen brightness of the j-th conference device.

6. A paperless conference management system based on a cloud platform according to claim 5, characterized in that: The cloud platform obtains the comfortable brightness difference range [B1j, B2j] acceptable to the user corresponding to the current j-th conference device, and obtains the comfortable brightness difference ranges acceptable to multiple users on both sides of the user corresponding to the current j-th conference device, removes the maximum and minimum values ​​in these comfortable brightness difference ranges, and then averages the remaining comfortable brightness difference ranges to obtain the average comfortable brightness difference range. based on Push brightness correction parameters to the intelligent lighting control device to adjust the current environment background brightness Benv,j; Define the adjusted value of the background brightness of the environment corresponding to the jth conference device as The calculation formula is: γ j is the brightness correction parameter corresponding to the jth conference device; S threshold,j is the visual sensitivity threshold acceptable to the user corresponding to the jth conference device; If γ j Less than 0 means that the user's visual sensitivity index is lower than the visual sensitivity threshold and is still within the comfortable range, and the ambient background brightness needs to be increased; If γ j If it is greater than 0, it means that the user's visual sensitivity index exceeds the acceptable visual sensitivity threshold and the ambient background brightness needs to be reduced to reduce the visual burden.

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