WO2005074168A1 - 可視光通信用のカメラ付き携帯端末 - Google Patents

可視光通信用のカメラ付き携帯端末 Download PDF

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Publication number
WO2005074168A1
WO2005074168A1 PCT/JP2005/001383 JP2005001383W WO2005074168A1 WO 2005074168 A1 WO2005074168 A1 WO 2005074168A1 JP 2005001383 W JP2005001383 W JP 2005001383W WO 2005074168 A1 WO2005074168 A1 WO 2005074168A1
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Prior art keywords
camera
visible light
light receiving
light communication
information
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PCT/JP2005/001383
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English (en)
French (fr)
Inventor
Masao Nakagawa
Shinichiro Haruyama
Original Assignee
Nakagawa Laoratories, Inc.
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Publication date
Application filed by Nakagawa Laoratories, Inc. filed Critical Nakagawa Laoratories, Inc.
Priority to US10/588,009 priority Critical patent/US20070254694A1/en
Priority to EP05709529A priority patent/EP1715598A4/en
Publication of WO2005074168A1 publication Critical patent/WO2005074168A1/ja

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
    • G06F1/1686—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675 the I/O peripheral being an integrated camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1626—Constructional details or arrangements for portable computers with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1143—Bidirectional 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
    • H04B10/11—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H04M1/72409—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories
    • H04M1/72412—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories using two-way short-range wireless interfaces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/52—Details of telephonic subscriber devices including functional features of a camera

Definitions

  • the present invention relates to a camera-equipped mobile terminal that receives visible light communication.
  • Mobile phones are a major element supporting Japanese industry today. In Japan, 70 million mobile phone terminals are used. Mobile phone terminals are not limited to telephone functions, but are equipped with infrared reading devices, have cameras, capture images, and, in some cases, recognize images. In addition, they have come to have RF-ID tags. If you have a mobile device, it will have the function of a credit card and, in some cases, even an ID card. Mobile devices are gaining momentum for mobile devices in the 1990s. Among them, cameras have the function of receiving visible image information of the outside world and are widely used. Extending such functions of the camera, the portable terminal extracts information from communication devices (for example, communication devices that rapidly modulate the LEDs used for displaying and lighting emergency lights and advertising lights) with visible light. Such a system is also being prototyped.
  • communication devices for example, communication devices that rapidly modulate the LEDs used for displaying and lighting emergency lights and advertising lights
  • the camera of the portable terminal is pointed in the direction of the light of the visible light communication device (for example, an emergency light) while viewing the image on the display in the hidden part on the right side, and the visible light Information can be obtained from (illumination light).
  • the visible light communication device for example, an emergency light
  • the image obtained from the camera 21 is displayed on the display 22 of the mobile terminal 20, as shown in FIG.
  • the image 23 of the visible light communication device such as an emergency light captured by the camera
  • the image captured by the camera is transmitted at a high speed.
  • the modulated visible light can be demodulated to obtain information on the light power of the illumination.
  • Non-Patent Document 1 For the detection of information transmitted by visible light communication using a digital camera, refer to Non-Patent Document 1 and the like.
  • Non-Patent Document 1 Nobuyuki Matsushita et al. "ID Cam: Smart camera capable of simultaneously acquiring scene and ID” Transactions of Information Processing Society of Japan Vol.43 No.6, pp.3664-3674, (2002-12)
  • An object of the present invention is to provide a camera-equipped mobile terminal capable of performing visible light communication without using a camera having a high sampling rate.
  • the present invention relates to a mobile terminal with a camera, comprising a light receiving unit for visible light provided separately from the camera, and receiving information by visible light with the light receiving unit. It is characterized by doing.
  • the light receiving unit is installed so as to face the same direction as the lens of the camera of the mobile terminal, and is configured to receive communication by visible light when a device transmitting information by visible light is displayed on the display of the camera. You can also.
  • the information on visible light communication can be received by the light receiving unit when the image is displayed on the camera display.
  • 3 and 4 show an embodiment of the present invention.
  • FIG. 4 shows a functional block diagram of the camera-equipped mobile terminal 20 shown in FIG. In FIG. 4, an image captured by the camera 21 is processed by the processing unit 26 and displayed on the display 22. Information from a visible light communication device (for example, an illumination device such as an emergency light) is converted into an electric signal by the light receiving unit 24 and displayed on the display 22 by the processing unit 26.
  • a visible light communication device for example, an illumination device such as an emergency light
  • the light receiving section 24 can be constituted by, for example, a photodiode or the like.
  • FIGS. 3 and 4 are similar to the configuration known as a twin-lens reflex system in camera technology.
  • a twin-lens reflex camera one of the two eyes is used for photographing the original image, and the other is used as a viewfinder for viewing the subject.
  • the portable terminal 20 is directed toward the visible light communication device (lighting equipment such as an emergency light), and visible light such as an emergency light is displayed.
  • the optical communication device is displayed on the display 22, it means that the illumination light from the visible light communication device that is generating information is sufficiently radiated to the light receiving unit 24 provided separately from the camera 21.
  • the camera 21 functions as a finder for a human to see the so-called visible light communication device as a subject.
  • the positional relationship between the camera 21 and the light receiving unit 24 may be set so that the direction is optimal for visible light communication.
  • the camera 21 is configured as a camera
  • the light receiving unit 24 is configured as a light receiving unit for visible light communication, so that information of visible light communication can be received at high speed without restriction of the camera.
  • the camera and the light receiving unit are installed in the same direction, and when the lighting equipment performing visible light communication is displayed on the camera display using the camera as a finder, the information of the visible light communication is displayed on the light receiving unit. You can see that you can receive it.
  • the light receiving unit 24 for visible light communication is sufficient if it can detect the intensity of light, so if the visible light communication device captured by the camera is reflected on the screen, the illumination light is modulated and sent. It can easily be set to detect incoming information.
  • FIG. 1 is a diagram showing a configuration of a conventional camera-equipped mobile terminal.
  • FIG. 2 is a diagram illustrating an operation of receiving information of visible light communication in a mobile terminal with a camera.
  • FIG. 3 is a diagram showing a configuration of a camera-equipped mobile terminal provided with a light receiving unit.
  • FIG. 4 is a diagram showing a functional block diagram of a camera-equipped mobile terminal provided with a light receiving unit. Explanation of symbols

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Optical Communication System (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Set Structure (AREA)
  • Telephone Function (AREA)
  • Telephonic Communication Services (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

［課題］可視光通信を受信できるカメラ付き携帯端末の提供 ［解決手段］従来のカメラ付き携帯端末２０が有しているカメラ２１とは別に、可視光からの情報を受信するために、カメラ２１の受光レンズと同じ方向を向いた可視光の受光部２４を設けている。この受光部２４により可視光からの情報を受信する。この受光部２４は、例えばフォトダイオード等で構成することができる。 　カメラ２１をファインダとして用いており、カメラのディスプレーに可視光通信を行っている照明器具が表示されたときに、受光部２４で可視光通信の情報を受けることができることが分かる。

Description

可視光通信用のカメラ付き携帯端末
技術分野
[0001] 本発明は、可視光の通信を受信するカメラ付き携帯端末に関するものである。
背景技術
[0002] 携帯電話は今日の日本の産業を支える大きな要素である。 日本では 7000万個の 携帯電話端末が利用されている。携帯電話の端末は単に電話機能に留まらず、赤 外線読み取り装置を備え、カメラを持ち，画像を写し、場合によっては、画像認識も する。さらに、 RF— IDタグを持つようになつてきた。携帯端末を持てば、クレジットカー ドの機能や、場合によっては身分証明書の機能さえも持つようになる。 1990年代の ノ ソコンの巿場ポジションを携帯端末が奪う勢いである。その中でカメラは外界の可 視の画像情報を受ける機能があり、広く普及している。カメラのそうした機能を拡張し て、可視光により通信装置 (例えば、非常灯や広告灯の表示や照明に使われる LED を高速に変調する通信装置)からの情報を携帯端末で取り出す、図 1のようなシステ ムも試作されている。
[0003] 図 1の場合では、携帯端末のカメラを可視光通信装置 (例えば、非常灯)の光の方 向に、右側の隠れた部分にあるディスプレーにより映像を見ながら向けることで、可視 光 (照明光)から情報を得ることができる。
カメラ 21から得られた映像は、図 2のように、携帯端末 20のディスプレー 22に表示 される。カメラの捕らえた非常灯等の可視光通信装置の映像 23が表示された状態で 、例えば、可視光通信を受信するように携帯端末 20にボタンを押して指令すると、力 メラが捉えた映像を高速にサンプリングすることにより、変調された可視光を復調して 、照明の光力も情報を得ることができる。
しかし、可視光通信に使用するカメラは、高速なサンプリング周波数が必要であり、 特殊なものになる。カメラの機能としてはオーバースペックで高価なカメラとなる。 通常のカメラを可視光通信に用いた場合、低速なサンプリング周波数により、可視 光通信で送られる情報の転送速度は、サンプリング周波数により制限されてしまう。 なお、デジタル 'カメラで可視光通信で送られた情報を検出することについては、非 特許文献 1等を参照されたい。
非特許文献 1：松下伸行他「ID Cam:シーンと IDを同時に取得可能なスマートカメラ」 情報処理学会論文誌 Vol.43 No.6, pp.3664-3674, (2002-12)
発明の開示
発明が解決しょうとする課題
[0004] 本発明の目的は、高速なサンプリング速度を有するカメラを用いずに、可視光通信 を行うことができるカメラ付き携帯端末を提供することである。
課題を解決するための手段
[0005] 上述の発明の目的を達成するために、本発明は、カメラ付き携帯端末において、力 メラとは別に設けた可視光の受光部を備え、該受光部で、可視光による情報を受信 することを特徴とする。
前記受光部は、携帯端末のカメラのレンズと同じ方向を向くように設置され、カメラ のディスプレーに、可視光により情報を送信する機器が写ったときに可視光による通 信を受信するように構成することもできる。
発明の効果
[0006] 可視光による通信の受光部をカメラとは別に設けることで、可視光通信の情報を力 メラの制約なしに高速に受光できる。
また、カメラをファインダ一として用いて、カメラのディスプレーに表示されたときに、 受光部で可視光通信の情報を受けることができる。
発明を実施するための最良の形態
[0007] 図面を用いて、本発明の実施形態を説明する。
図 3,図 4に本発明の実施形態を示す。
図 3に示すように、従来のカメラ付き携帯端末 20が有しているカメラ 21とは別に、可 視光 (照明光を含む)からの情報を受信するために、カメラ 21の受光レンズと同じ方 向を向いた可視光の受光部 24を設けている。この受光部 24により、可視光による情 報を受信する。この受光部 24は、例えばフォトダイオード等で構成することができる。 [0008] 図 4は、図 3に示したカメラ付き携帯端末 20の機能ブロック図を示している。図 4に おいて、カメラ 21で捉えた映像は、処理部 26により処理されて、ディスプレー 22に表 示される。可視光通信装置 (例えば、非常灯等の照明装置)からの情報は、受光部 2 4により電気信号に変換され、処理部 26により、例えばディスプレー 22に表示される 。図 4では、携帯端末 20において当然有している音声関連のマイクやスピーカーや ボタン等は、図示していない。なお、可視光通信装置力もの情報をディスプレー 22に 表示するのではなぐ音声合成してスピーカーから聞こえるようにしてもよい。また、こ の受光部 24は、例えばフォトダイオード等で構成することができる。
[0009] 図 3,図 4に示した構成は、カメラ技術では、二眼レフ方式として知られている構成と 類似のものである。二眼レフでは二眼の一方は画像本来の撮影のために、もう一方 は被写体を人間が見るファインダとして用いている。本発明の実施形態である図 3に 示した構成においても、図 2に示すように、携帯端末 20を可視光通信装置 (非常灯 等の照明器具)の方向に向けて、非常灯等の可視光通信装置がディスプレー 22に 写ると、情報を発生している可視光通信装置からの照明光を、カメラ 21とは別に設け た受光部 24に十分に照射していることになる。即ち、この場合、カメラ 21は、謂わば 可視光通信装置を被写体として人間が見るためのファインダとして機能している。な お、ディスプレー 22の所定の領域に可視光通信装置が写ると、可視光通信に最適 な方向であるように、カメラ 21と受光部 24との位置関係を設定してもよい。
[0010] 従来は、可視光通信力も送られた情報を、携帯端末に付属して 、るカメラでとらえ たために、カメラを特殊なサンプリング速度が速いものに置き換える必要性が生じた。 図 3の構成は、カメラ 21はカメラ、受光部 24は可視光通信の受光部として構成するこ とで、可視光通信の情報をカメラの制約なしに高速に受光できる。
さらに、カメラと受光部とを同じ向きに設置し、カメラをファインダとして用いて、カメラ のディスプレーに可視光通信を行なっている照明器具が表示されたときに、受光部 で可視光通信の情報を受けることができることが分かる。可視光通信の受光部 24は 、光の強弱の検出を行うことができれば十分であるので、カメラがとらえた可視光通信 装置が画面の中に映っていれば、照明光を変調して送られてくる情報を検出できる ように設定することは容易にできる。 図面の簡単な説明
[0011] [図 1]従来のカメラ付き携帯端末の構成を示す図である。
[図 2]カメラ付き携帯端末で可視光通信の情報を受ける操作を説明する図である。
[図 3]受光部を設けたカメラ付き携帯端末の構成を示す図である。
[図 4]受光部を設けたカメラ付き携帯端末の機能ブロック図を示す図である。 符号の説明
[0012] 10：可視光通信装置 (照明器具）
20:カメラ付き携帯端末
21:カメラ咅
22:ディスプレー
23：可視光通信装置 (照明器具)の画像
24：可視光通信用の受光部
25:復調部
26:処理部
27:送受信部
28:アンテナ

Claims

請求の範囲
[1] カメラ付き携帯端末にぉ 、て、
カメラとは別に設けた可視光の受光部を備え、
該受光部で、可視光による情報を受信することを特徴とする携帯端末。
[2] 請求項 1に記載の携帯端末において、
前記受光部は、携帯端末のカメラのレンズと同じ方向を向くように設置され、 カメラのディスプレーに、可視光により情報を送信する機器が写ったときに可視光に よる通信を受信することを特徴とする携帯端末。
PCT/JP2005/001383 2004-02-02 2005-02-01 可視光通信用のカメラ付き携帯端末 WO2005074168A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/588,009 US20070254694A1 (en) 2004-02-02 2005-02-01 Camera-Equipped Cellular Terminal for Visible Light Communication
EP05709529A EP1715598A4 (en) 2004-02-02 2005-02-01 PORTABLE TERMINAL WITH INCORPORATED CAMERA FOR VISIBLE LIGHT COMMUNICATION

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JP2004026067A JP2005218067A (ja) 2004-02-02 2004-02-02 可視光通信用のカメラ付き携帯端末
JP2004-026067 2004-02-02

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US (1) US20070254694A1 (ja)
EP (1) EP1715598A4 (ja)
JP (1) JP2005218067A (ja)
KR (1) KR20060123581A (ja)
CN (1) CN1914834A (ja)
TW (1) TW200601730A (ja)
WO (1) WO2005074168A1 (ja)

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CN1914834A (zh) 2007-02-14
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