WO2015103855A1 - 一种缓解帧间闪烁的调光方法和装置 - Google Patents

一种缓解帧间闪烁的调光方法和装置 Download PDF

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Publication number
WO2015103855A1
WO2015103855A1 PCT/CN2014/081268 CN2014081268W WO2015103855A1 WO 2015103855 A1 WO2015103855 A1 WO 2015103855A1 CN 2014081268 W CN2014081268 W CN 2014081268W WO 2015103855 A1 WO2015103855 A1 WO 2015103855A1
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Prior art keywords
avg
frame
dimming
transmitting end
rfato
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French (fr)
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吕宁
支周
禹忠
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ZTE Corp
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ZTE Corp
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Priority to US15/110,220 priority Critical patent/US9887776B2/en
Priority to EP14878314.5A priority patent/EP3094018B1/en
Priority to JP2016545340A priority patent/JP6397034B2/ja
Publication of WO2015103855A1 publication Critical patent/WO2015103855A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/002—Specific input/output arrangements not covered by G06F3/01 - G06F3/16
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1141—One-way transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection

Definitions

  • VLC Visible Light Communication
  • RF radio frequency
  • the flicker problem between frames is due to the average brightness of the light source when transmitting data and the average brightness of the illumination state (ie, the transmitting end is in the receiving state or the idle lighting state).
  • the method is that the transmitting end uses an idle pattern in the idle/receive state, that is, independently transmits a frame for adjusting the brightness of the light source. This method requires accurate calculation, so that the brightness of the light source frame is adjusted.
  • the duty ratio (Duty Cycle) is the same as the duty ratio of the line coding scheme used in the physical layer. Thus, the adjustment of the luminance level of the source and the average luminance value of the data frame are equal.
  • the present invention provides an mitigation frame An inter-flashing dimming method and apparatus for extending a compensated frame luminance range for dimming purposes.
  • a dimming method for mitigating interframe flicker which includes: calculating a transmitting end transmitting Average brightness value A V g rfato; The ratio of the average luminance value in the determination Avg 3 ⁇ 4gto Avg rfato whether an inter illumination state and flashes when the sending end transmits data; inter flicker generated when data is transmitted to the transmitting end, the sending end in an idle In the mode, a dimming frame is inserted, and the dimming frame is used to compensate for the difference in brightness between the Avg rfato and the Avg 3 ⁇ 4gto .
  • determining, according to the ratio of the Avg rfato and the Avg 3g4gto , whether the inter-frame flicker is generated when the transmitting end sends data according to the Avg rfato and the Avg 3 ⁇ 4gto, determining whether the following formula is established:
  • the process in which the transmitting end inserts the dimming frame in the idle mode includes: calculating a duty ratio range of the inserted dimming frame according to the following formula:
  • the calculating, by the transmitting end, an average luminance value Avg rfato when transmitting the physical frame refers to: calculating, by the calculating, the end of the line coding used by the physical layer to obtain Avg rfato .
  • the invention also discloses a dimming device for relieving flicker between frames, comprising: a storage module, configured to store dimming information of different lengths for adjusting brightness of the light source; and a processing module configured to calculate that the transmitting end is transmitting the physical frame Avg rfato average luminance value, the average luminance value of the ratio is determined Avg 3 ⁇ 4gto Avg rfato said illumination state and whether an inter-blink when the sending end transmits data, and generates flicker when the inter-transmission data terminal When in the idle mode of the transmitting end, And extracting a corresponding dimming information from the storage module to generate a dimming frame and inserting into a physical frame, where the dimming frame is used to compensate for a difference in brightness between the Avg rfato and the Avg 3 ⁇ 4gto .
  • the processing module is configured to determine whether the following formula is established according to the Avg rfato and the Avg 3 ⁇ 4gto
  • the processing module is configured to calculate a duty ratio range of the inserted dimming frame according to the following formula: (1 - ⁇ ) ⁇ ⁇ ⁇ ( ⁇ + ⁇ ) ⁇ ⁇ where, indicating a physical layer
  • the duty ratio of the line coding method is constant; the processing module is configured to extract dimming information that satisfies the duty cycle range from the storage unit in an idle mode of the transmitting end, and generate dimming Frame insertion is sent.
  • the processing unit is configured to obtain Avg rfato by calculating a duty ratio of a line code used by the physical layer.
  • the above device is disposed in the transmitting end of the visible light communication system or outside the transmitting end of the visible light communication system. In the idle mode of the transmitting end, the value of the duty ratio of the physical frame that transmits the brightness of the adjusted light source is within a certain interval, and does not need to be exactly equal to the duty ratio of the line coding used by the physical layer.
  • 1 is a flowchart of a method for implementing inter-frame flicker mitigation according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a method for implementing inter-frame flicker mitigation according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a dimming device according to an embodiment of the present invention
  • Embodiment 1 In the embodiment of the present invention, a method for mitigating inter-frame flicker is proposed by using a variation law of light source brightness that can be perceived by the human eye, that is, a duty ratio of a physical frame that adjusts the brightness of the light source sent by the transmitting end in the idle mode.
  • the value is within a certain interval and does not need to be exactly equal to the duty cycle of the line code used by the physical layer.
  • Inter dimming flashing relief includes: calculating the average luminance value of the transmission A V g rfato when sending end of a physical frame; Analyzing transmitted in accordance with a ratio of average luminance value Avg 3 ⁇ 4gto the illumination state and the Avg rfato whether the end of transmission data generated when the inter scintillator; inter flicker when generating the transmission data transmitting side, the transmitting side in the idle mode, dimming insert frame, the frame is used to compensate the dimming Avg 3 ⁇ 4gto Avg rfato the luminance difference.
  • the average luminance value Avg rfato when the transmitting end sends the physical frame, it can be obtained by calculating the duty ratio of the line coding used by the physical layer. Comparing the average brightness value of the physical frame transmitted when the average luminance value Avg 3 ⁇ 4gto Avg rfato the illumination state, and the ratio between Avg rfato Avg 3 ⁇ 4gto be calculated as follows:
  • the above formula is derived from the Weber-Fechner theorem, which defines the change in brightness that the human eye can perceive.
  • the parameter K in the formula is obtained experimentally.
  • the transmitting end transmits a dimming frame for mitigating flicker in the idle mode.
  • the idle mode refers to the illumination state in which the transmitting end is in the receiving state or idle.
  • the average luminance calculation of the inserted dimming frame is determined by the duty ratio of the dimming frame, and the duty ratio of the dimming frame is calculated as follows: A -
  • the parameter indicates the duty cycle of the line coding method used by the physical layer.
  • the parameter is a constant and is measured by the experiment.
  • the value of the duty cycle calculated by this formula is within a certain interval. That is, the average brightness of the dimming frame is within a certain interval. Any dimming frame of any average brightness value in this interval does not produce a change in brightness that can be perceived by the human eye when the dimming purpose is achieved.
  • Step 100 Calculate the average brightness of the physical frame of the transmitting end Avg ', data. In this step, the average brightness can be obtained by the transmitting end.
  • the duty cycle (Duty Cycle) of the line coding used to transmit the physical frame is determined. Taking the Manchester code as an example, the duty cycle of the code is 50%.
  • the line coding of the physical layer is a Manchester code, assuming that the brightness of the bit "0" is 100% of the brightness of the bit "1", for a sequence of "0", "1" bits of any length (ie, a physical frame), The physical frame has an average brightness of 50%. When the sender is only in illumination, its average brightness is 100%.
  • Step 101 Determine whether there is currently inter-frame flicker according to the ratio of the average brightness Avg rfato of the transmitting end when transmitting the physical frame to the average brightness Avg 3g4gto in the illumination state. If yes, proceed to step 102, otherwise the transmitting end maintains the illumination state 103; Specifically, in this step, it is judged whether the ratio of Avg rfato to Avg 3 ⁇ 4gto satisfies the following formula 1:
  • the above formula is derived from the Weber-Fechner theorem, which defines the change in brightness that the human eye can perceive.
  • the parameters in the formula are obtained experimentally.
  • the above formula indicates that the transmitting end does not produce an inter-frame flicker that can be perceived by the human eye when the two processes of transmitting data and illumination alternately appear, that is, there is no inter-frame flicker, and no insertion is required at this time. Dimming frame.
  • the above formula is not established, it indicates that the inter-frame flicker occurs when the transmitting end alternates between the two processes of transmitting data and illumination, and it is necessary to proceed to step 102 to perform the insertion operation of the dimming frame.
  • Step 102 When the transmitting end is in an idle mode (ie, a receiving state or an illumination state), transmitting a dimming frame for relieving flickering between frames.
  • the duty ratio of the dimming frame for mitigating interframe flicker can be calculated according to the following formula 2:
  • the parameter indicates the duty ratio of the line coding method adopted by the physical layer; the parameter is the duty ratio of the dimming frame; the parameter is a constant, which is measured by an experiment. Further derivation of Equation 2, the range of the duty cycle of the dimming frame can be obtained, as shown in Equation 3:
  • Equation 3 Schematic diagram of the dimming frame calculated by Equation 3, as shown in Figure 2.
  • the average luminance of 0 & 1 and 1) is 50%, and the line coding used is, for example, Manchester code.
  • the line coding used is, for example, Manchester code.
  • the average luminance value at this time is 100%.
  • the duty ratio values of Din ⁇ and Dim 2 are calculated by Equation 2, and the values are arbitrary values within the interval satisfying Equation 2. Since the dimming frame transmitted in the idle mode is only used to support the visibility of the transmitting end, the dimming frame transmitted by the transmitting end does not need to undergo line coding, channel coding, modulation, and the like.
  • the direct transmission duty ratio conforms to the "0" and "1" bit sequences of Equation 2, which can achieve the purpose of flicker mitigation.
  • Embodiment 2 This embodiment provides a dimming device for relieving flicker between frames, which includes at least the following parts.
  • a storage module configured to save dimming information of different lengths for adjusting brightness of the light source; and a processing module configured to calculate an average brightness value Avg rfato of the transmitting end when transmitting the physical frame, according to the average brightness of the Avg rfato and the illumination state
  • the ratio of the value Avg 3 ⁇ 4gto determines whether the inter-frame flicker is generated when the transmitting end sends data, and when the transmitting end generates inter-frame flicker when transmitting data, in the idle mode, from the storage module Extracting the corresponding dimming information to generate a dimming frame and inserting into the physical frame, wherein the dimming frame is used to compensate the brightness difference between the Aygdata and the Avg to .
  • the processing module is configured to determine whether the following formula is valid according to Avg rfato and Avg 3 ⁇ 4gto :
  • the processing module can determine that the inter-frame flicker is generated when the transmitting end transmits data.
  • the processing module generates a dimming frame according to the corresponding dimming information extracted from the storage module as follows: First, calculate the duty ratio range of the inserted dimming frame according to the following formula:
  • the processing module calculates the average luminance value Avg rfato when the transmitting end transmits the physical frame, and can obtain the duty ratio of the line coding used by the physical layer.
  • the above device may be disposed in the transmitting end of the visible light communication system, or may be independently set. The specific operation process of the dimming device will be described below by taking the dimming device shown in FIG. 3 as an example. As shown in FIG. 3
  • the storage module is configured to save dimming information of different lengths for adjusting the brightness of the light source, including "0" and "1" of different lengths. sequence.
  • the processing module is set to encode and decode physical frames, generate dimming frames, and the like.
  • the method includes: calculating an average luminance value Avg rfato when the transmitting end sends the physical frame, and determining, according to the ratio of the Avg rfato and the average luminance value Awg llght in the illumination state, whether the inter-frame flicker is generated when the transmitting end sends the data, and is at the transmitting end.
  • the corresponding dimming information is extracted from the storage module to generate a dimming frame and inserted into the physical frame.
  • the optical drive transmission module is configured to implement the data transmission and the brightness adjustment of the light source and the illumination.
  • the specific implementation may adopt the method in the related art, and the implementation is not used to limit the protection scope of the present invention, and details are not described herein again.
  • the dimming information in the dimming frame is a sequence of "0" and "1" of different lengths read from the storage unit.
  • a program to instruct the associated hardware such as a read only memory, a magnetic disk, or an optical disk.
  • each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module.
  • This application is not limited to any specific combination of hardware and software. The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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Abstract

一种缓解帧间闪烁的调光方法及调光装置，涉及可见光通信技术。所述调光方法包括：计算发送端在发送物理帧时的平均亮度值Avgdata；根据所述Avgdata与照明状态下平均亮度值Avglight的比值判断所述发送端发送数据时是否产生帧间闪烁；当所述发送端发送数据时产生帧间闪烁，则所述发送端在空闲模式下，插入调光帧，所述调光帧用于补偿所述Avgdata与Avglight的亮度差。此外，还公开了一种缓解帧间闪烁的调光装置。在发送端空闲模式时，发送调节光源亮度的物理帧的占空比的取值范围位于一定的区间内，不需要精确地等于物理层所采用线路编码的占空比。

Description

一种缓解帧间闪烁的调光方法和装置 技术领域 本发明涉及可见光通信技术， 尤指一种缓解帧间闪烁的调光方法及调光装置。 背景技术 可见光通信（VLC， Visible Light Communication)技术， 是指使用人肉眼可见的、 波长在 400纳米（nm)到 700nm范围内的光介质进行短距离光无线通信的技术。 VLC 技术具有不受电磁干扰、不存在与射频（RF)系统相关的干扰等优点， 并且其所使用的 频谱范围是免许可频谱 （unlicensed spectrum )„ 使用可见光进行数据传输时， 在发送 端， 可以通过快速地打开和关闭可见光源 （例如， 发光二极管） 或者对可见光源亮度 进行调制； 在接收端， 接收到经过调制的光信号之后， 将其转化为接收端可以处理的 数据。 在使用可见光进行通信时， 首先必须保证在实现数据传输的同时， 不影响到用户 对照明设备的正常使用。 这需要考虑以下两个问题： 一是实现数据的传输功能； 二是 在传输数据帧时， 不能出现帧间闪烁 （Inter-fmme Flicker) 问题。 帧间闪烁问题， 是 由于发送数据时的光源平均亮度与照明状态 （即发送端处于接收状态或者空闲的照明 状态） 时的平均亮度， 两者之间不同造成的。 相关技术中的缓解帧间闪烁的方法是， 发送端在空闲 /接收状态下， 使用空闲模式 (idle pattern), 即独立地发送用于调节光源亮度的帧。这种方法要求通过精确地计算， 使得用于调节光源亮度帧的占空比 （Duty Cycle) 与物理层所采用线路编码 （Line Coding) 方案的占空比相同。 这样， 调节光源亮度帧与数据帧的平均亮度值就相等。 发明内容 本发明提供了一种缓解帧间闪烁的调光方法和装置， 以扩展用于调光目的的补偿 帧亮度范围。 为了解决上述技术问题， 本发明公开了一种缓解帧间闪烁的调光方法， 包括： 计算发送端在发送物理帧时的平均亮度值 AVgrfato; 根据所述 Avgrfato与照明状态下平均亮度值 Avg¾gto的比值判断所述发送端发送数 据时是否产生帧间闪烁； 当所述发送端发送数据时产生帧间闪烁， 则所述发送端在空闲模式下， 插入调光 帧， 所述调光帧用于 补偿所述 Avgrfato与 Avg¾gto的亮度差。 可选地，上述方法中，根据所述 Avgrfato与 Avg¾gto的比值判断所述发送端发送数据 时是否产生帧间闪烁指： 根据所述 Avgrfato与 Avg¾gto判断如下公式是否成立：
I Αν§ 。-Αν§¾¾ I , κ
其中， 为常数； 当上述公式不成立时， 判断所述发送端发送数据时产生帧间闪烁。 可选地， 上述方法中， 所述发送端 在空闲模式下， 插入调光帧的过程包括： 按照如下公式计算插入调光帧的占空比范围：
(1 - Κ) χ Α < < (Κ + ϊ) χ Α 其中， 表示物理层所采用线路编码方法的占空比， 为常数； 所述发送端 在空闲模式下， 将计算出的占空比范围内的任意一个占空比的调 光帧插入发送。 可选地， 上述方法中， 所述计算发送端在发送物理帧时的平均亮度值 Avgrfato指： 所述计算发送端通过计算物理层使用的线路编码的占空比得到 Avgrfato。 本发明还公开了一种缓解帧间闪烁的调光装置， 包括： 存储模块， 设置为保存不同长度的用于调节光源亮度的调光信息； 处理模块， 设置为计算发送端在发送物理帧时的平均亮度值 Avgrfato， 根据所述 Avgrfato与照明状态下平均亮度值 Avg¾gto的比值判断所述发送端发送数据时是否产生帧 间闪烁， 并在所述发送端发送数据时产生帧间闪烁时， 在所述发送端的空闲模式下， 从所述存储模块中提取对应的调光信息生成调光帧并插入物理帧中， 所述调光帧用于 补偿所述 Avgrfato与 Avg¾gto的亮度差。 可选地，上述装置中，所述处理模块设置为根据所述 Avgrfato与 Avg¾gto判断如下公 式是否成立： I Avg^ -Avg^ I , κ
其中， 为常数； 当上述公式不成立时， 判断所述发送端发送数据时产生帧间闪烁。 可选地， 上述装置中， 所述处理模块设置为按照如下公式计算插入调光帧的占空 比范围： (1 - Κ) χ Α < < (Κ + ϊ) χ Α 其中， 表示物理层所采用线路编码方法的占空比， 为常数； 所述处理模块， 设置为在所述发送端的空闲模式下， 从所述存储单元中提取满足 上述占空比范围的调光信息， 并生成调光帧插入发送。 可选地， 上述装置中， 所述处理单元， 设置为通过计算物理层使用的线路编码的 占空比得到 Avgrfato。 可选地， 上述装置设置在可见光通信系统的发送端中， 或设置在可见光通信系统 的发送端的外部。 本发明技术方案在发送端空闲模式时， 发送调节光源亮度的物理帧的占空比的取 值位于一定的区间内， 不需要精确地等于物理层所采用线路编码的占空比。 附图说明 图 1为本发明实施例实现帧间闪烁缓解的方法的流程图； 图 2为本发明实施例实现帧间闪烁缓解的方法的示意图； 图 3 为本发明实施例实现调光装置的组成结构示意图。 具体实施方式 为使本发明的目的、 技术方案和优点更加清楚明白， 下文将结合附图对本发明技 术方案作进一步详细说明。 需要说明的是， 在不冲突的情况下， 本申请的实施例和实 施例中的特征可以任意相互组合。 实施例 1 本发明实施例利用人肉眼可以感知的光源亮度变化规律， 提出一种缓解帧间闪烁 的方法， 即， 发送端在空闲模式时， 发送的调节光源亮度的物理帧的占空比的取值位 于一定的区间内， 不需要精确地等于物理层所采用线路编码的占空比。 本实施例提供的缓解帧间闪烁的调光方法包括： 计算发送端在发送物理帧时的平均亮度值 AVgrfato; 根据所述 Avgrfato与照明状态下平均亮度值 Avg¾gto的比值判断发送端发送数据时 是否产生帧间闪烁； 当发送端发送数据时产生帧间闪烁， 则发送端 在空闲模式下， 插入调光帧， 该 调光帧用于补偿 Avgrfato与 Avg¾gto的亮度差。 其中， 计算发送端在发送物理帧时的平均亮度值 Avgrfato时，可以通过计算物理层 使用的线路编码的占空比得到。 比较发送物理帧时的平均亮度值 Avgrfato与照明状态下平均亮度值 Avg¾gto时，可以 按照如下公式计算 Avgrfato与 Avg¾gto之间的比值：
I Avg^ -Avg^ I , κ
上式由 Weber-Fechner定理得出， 其定义了人眼能够感觉到的亮度变化。 式中参 数 K由实验得出。 由于数据发送而在帧间产生人肉眼可以感觉到的闪烁时， 发送端在空闲模式下发 送用于缓解闪烁的调光帧。 空闲模式是指发送端处于接收状态或者空闲的照明状态。 在本实施例中， 在空闲模式下， 插入调光帧的平均亮度计算， 由调光帧的占空比 计算确定， 调光帧的占空比 ^的计算如下： A -
≤K
A 公式中， 参数 表示物理层所采用线路编码方法的占空比， 参数 为常数， 由实 验测得。 由该公式计算得到的占空比的值位于某个区间内。 即 调光帧的平均亮度位 于某个区间内。 在本区间内的任意平均亮度值调光帧， 在实现调光目的时， 都不产生 人肉眼能感知的亮度变化。 下面结合图 1， 说明上述缓解帧间闪烁的调光方法的具体实现过程， 包括如下操 作： 步骤 100， 计算发送端物理帧的平均亮度 Avg ',data 该步骤中，平均亮度可以由发送端在发送物理帧时所采用的线路编码 (Line Coding) 的占空比 (Duty Cycle)确定。 以曼彻斯特码为例， 其编码的占空比为 50%。 当物理层的 线路编码是曼彻斯特码时， 假设位 "0" 的亮度为,位 " 1 " 的亮度为 100%时， 对于任 意长度的" 0"、 "1"位序列 （即物理帧）， 该物理帧的平均亮度为 50%。 当发送端仅处于 照明状态时， 其平均亮度为 100%。 步骤 101， 根据发送端在发送物理帧时的平均亮度 Avgrfato与照明状态下的平均亮 度 Avg¾gto的比值判断当前是否存在帧间闪烁， 如果是， 进入步骤 102， 否则发送端保 持照明状态 103 ; 具体地， 该步骤即中判断 Avgrfato与 Avg¾gto的比值是否满足如下公式 1：
Avgrfafa - Avg/¾to
< K (公式 1)
Avg 上述公式是由 Weber-Fechner定理得出， 其定义了人眼能够感觉到的亮度变化。 式中参数 由实验得出。 当上述中公式成立时， 这表明发送端在发送数据过程和照明这两种状态交替出现 时， 并未产生人肉眼可以觉察到的帧间闪烁， 即不存在帧间闪烁， 此时不需要插入调 光帧。 而上述公式不成立时， 则表明发送端在发送数据过程和照明这两种状态交替出现 时， 出现了帧间闪烁， 需要进入步骤 102进行调光帧的插入操作。 步骤 102， 发送端在空闲模式 （即接收状态或者照明状态） 时， 发送用于缓解帧 间闪烁的调光帧。 其中， 可按照如下公式 2计算用于缓解帧间闪烁的调光帧的占空比：
上述公式 2中， 参数 表示物理层所采用线路编码方法的占空比； 参数 为调光帧的占空比； 参数 为常数， 由实验测得。 进一步推导公式 2， 可得调光帧的占空比 的取值范围， 如公式 3所示：
(1 - Κ) χ Α < α < (Κ + ϊ) χ Α (公式 3) 由公式 3计算得到的调光帧示意图， 如图 2所示。 在图 2中， 发送数据时， 0& 1和1)^ 的平均亮度为 50%， 所采用的线路编码如 曼彻斯特码等。 在 0^ 发送完成之后和 Data2发送之前这段时间内， 如果发送端处于 照明状态，则此时的平均亮度值为 100%。假设此时的亮度变化是人肉眼可以感觉得到 的 （即 K=0.5 )， 则需要插入调光帧， 如图中的 Dim^P Dim2。 Din^和 Dim2的占空比 值由公式 2计算得到， 取值为满足公式 2的区间内的任意值即可。 由于在空闲模式下发送的调光帧只是用于支持发送端的可见性， 因此发送端所发 送的调光帧不需要经过线路编码、 信道编码、 调制等过程。 直接发送占空比符合公式 2的" 0"、 "1 "位序列， 可以实现闪烁缓解的目的。 实施例 2 本实施例提供一种缓解帧间闪烁的调光装置， 至少包括如下各部分。 存储模块， 设置为保存不同长度的用于调节光源亮度的调光信息； 处理模块， 设置为计算发送端在发送物理帧时的平均亮度值 Avgrfato， 根据所述 Avgrfato与照明状态下平均亮度值 Avg¾gto的比值判断所述发送端发送数据时是否产生帧 间闪烁， 当所述发送端发送数据时产生帧间闪烁， 则在空闲模式下， 从所述存储模块 中提取对应的调光信息生成调光帧并插入物理帧中， 其中， 所述调光帧用于补偿所述 Aygdata与 Avg to的亮度差。 其中， 处理模块设置为根据 Avgrfato与 Avg¾gto判断如下公式是否成立：
I Αν§ 。-Αν§¾¾ I , κ
其中， 为常数； 当上述公式不成立时， 处理模块即可判断发送端发送数据时产生帧间闪烁。 处理模块根据存储模块中提取对应的调光信息生成调光帧的过程如下： 先按照如下公式计算插入调光帧的占空比范围：
(1 - Κ) χ Α < < (Κ + ϊ) χ Α 其中， 表示物理层所采用线路编码方法的占空比， 为常数； 再从存储模块中提出在上述占空比范围内的调光信息， 再生成调光帧插入发送。 处理模块,计算发送端在发送物理帧时的平均亮度值 Avgrfato时，可通过计算物理层 使用的线路编码的占空比得到。 还要说明的是， 上述装置可以设置在可见光通信系统的发送端中， 也可以独立设 置。 下面以图 3所示的调光装置为例， 说明调光装置的具体工作过程。如图 3 所示， 至少包括处理模块、 存储模块和光驱动传输模块， 其中： 存储模块， 设置为保存不同长度的用于调节光源亮度的调光信息， 包括不同长度 的" 0"、 " 1"序列。 处理模块， 设置为物理帧的编码和解码、 调光帧的生成等。 具体地， 包括计算发 送端在发送物理帧时的平均亮度值 Avgrfato， 以及根据 Avgrfato与照明状态下平均亮度值 Awgllght的比值判断发送端发送数据时是否产生帧间闪烁， 并在发送端发送数据时产生 帧间闪烁时， 在空闲模式下， 从存储模块中提取对应的调光信息生成调光帧并插入 物理帧中。 光驱动传输模块， 设置为实现数据传输和光源亮度调节并照明， 具体实现可以采 用相关技术中的方法， 其实现不用于限定本发明的保护范围， 这里不再赘述。 其中， 调光帧中的调光信息是从存储单元读取的不同长度的" 0"、 "1"序列。 本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相 关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读存储器、 磁盘或光 盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以采用硬件的形式实现， 也可以采用软件功能 模块的形式实现。 本申请不限制于任何特定形式的硬件和软件的结合。 以上所述， 仅为本发明的较佳实例而已， 并非用于限定本发明的保护范围。 凡在 本发明的精神和原则之内， 所做的任何修改、 等同替换、 改进等， 均应包含在本发明 的保护范围之内。

Claims

权 利 要 求 书 、 一种缓解帧间闪烁的调光方法， 包括：
计算发送端在发送物理帧时的平均亮度值 Avgrfato；
根据所述 Avgrfato与照明状态下平均亮度值 Avg¾gto的比值判断所述发送端 发送数据时是否产生帧间闪烁； 当所述发送端发送数据时产生帧间闪烁， 则所述发送端 在空闲模式下， 插入调光帧， 所述调光帧用于 补偿所述 Avgrfato与 Avg¾gto的亮度差。 、 如权利要求 1所述的方法，其中，根据所述 Avgrfato与 Avg¾gto的比值判断所述发 送端发送数据时是否产生帧间闪烁包括：
根据所述 Avgrfato与 Avg¾gto判断如下公式是否成立：
其中， 为常数；
当上述公式不成立时， 判断所述发送端发送数据时产生帧间闪烁。 、 如权利要求 1或 2所述的方法， 其中， 所述发送端在空闲模式下， 插入调光帧 的过程包括：
按照如下公式计算插入调光帧的占空比范围：
(1 - Κ) χ Α < < (Κ + ϊ) χ Α 其中， 表示物理层所采用线路编码方法的占空比， 为常数； 所述发送端在空闲模式下，将计算出的占空比范围内的任意一个占空比的 调光帧插入发送。 、 如权利要求 3所述的方法， 其中， 所述计算发送端在发送物理帧时的平均亮度 值 Avgrfato包括：
所述计算发送端通过计算物理层使用的线路编码的占空比得到 Avgrfato。 、 一种缓解帧间闪烁的调光装置， 包括： 存储模块， 设置为保存不同长度的用于调节光源亮度的调光信息； 处理模块， 设置为计算发送端在发送物理帧时的平均亮度值 Avgrfato， 根据 所述 Avgrfato与照明状态下平均亮度值 Avg¾gto的比值判断所述发送端发送数据 时是否产生帧间闪烁， 并在所述发送端发送数据时产生帧间闪烁时， 在所述发 送端的空闲模式下， 从所述存储模块中提取对应的调光信息生成调光帧并插入 物理帧中， 所述调光帧用于 补偿所述 Avgrfato与 Avg¾gto的亮度差。 、 如权利要求 5所述的装置，其中，所述处理模块设置为根据所述 Avgrfato与 Avg¾gto 判断如下公式是否成立：
Figure imgf000011_0001
其中， 为常数；
当上述公式不成立时， 判断所述发送端发送数据时产生帧间闪烁。 、 如权利要求 5或 6所述的装置， 其中， 所述处理模块设置为按照如下公式计算 插入调光帧的占空比范围：
(1 - Κ) χ Α < < (Κ + ϊ) χ Α 其中， 表示物理层所采用线路编码方法的占空比， 为常数； 所述处理模块， 在所述发送端的空闲模式下， 从所述存储单元中提取满足 上述占空比范围的调光信息， 并生成调光帧插入发送。 、 如权利要求 7所述的装置， 其中， 所述处理单元， 设置为通过计算物理层使用 的线路编码的占空比得到 Avgrfato。 、 如权利要求 7所述的装置， 其中， 该装置设置在可见光通信系统的发送端中， 或设置在可见光通信系统的发送端的外部。
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