JPH03201179A - Counting method of the number of passers-by - Google Patents

Counting method of the number of passers-by

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Publication number
JPH03201179A
JPH03201179A JP33679489A JP33679489A JPH03201179A JP H03201179 A JPH03201179 A JP H03201179A JP 33679489 A JP33679489 A JP 33679489A JP 33679489 A JP33679489 A JP 33679489A JP H03201179 A JPH03201179 A JP H03201179A
Authority
JP
Japan
Prior art keywords
light
optical sensors
optical
sensors
optical sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP33679489A
Other languages
Japanese (ja)
Other versions
JP2963125B2 (en
Inventor
Makoto Saruta
誠 猿田
Kenichi Uose
魚瀬 憲一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NCR Voyix Corp
Original Assignee
NCR Corp
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Filing date
Publication date
Application filed by NCR Corp filed Critical NCR Corp
Priority to JP33679489A priority Critical patent/JP2963125B2/en
Publication of JPH03201179A publication Critical patent/JPH03201179A/en
Application granted granted Critical
Publication of JP2963125B2 publication Critical patent/JP2963125B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE: To improve counting precision by arranging optical sensors in two lines at prescribed intervals in a direction for crossing a passage so that they are not adjacent in front and behind and in right and left and detecting the head from the shoulder part of an adult. CONSTITUTION: The optical sensors in an A line and those in a B line are installed by making them lean so that the optical axes have prescribed angles against a vertical direction. The directions are made so that the optical axes are mutually detached and the fitting lean angles are made to be 2 deg.-5 deg. against the vertical straight line in accordance with the directivity of the optical sensors to be used. The detection sensitivities of the optical sensors are set so that light beams from a light emitter when the adult stands just under the sensors are abutted on the shoulder or the head of the person and are reflected and the reflected light turns on a light receiver. The light luminosity of the light emitter and the received light sensitivity of the light receiver are adjusted in accordance with the installed height of the optical sensors on the floor are adjusted. Thus, counting precision improves.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は百貨店や催し物会場等多数の人間が出入りする
場所における人出湯者数を計数する方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for counting the number of people bathing in a place where a large number of people come and go, such as a department store or an event venue.

〔従来の技術〕[Conventional technology]

所定の場所における通過人数を計数する方法は従来より
光学的検出手段による方法、赤外線センサを利用する方
法、超音波センサを利用する方法等がある。そして上記
センサ等を複数個用いることによって人間の通過方向を
も判断する方法が試みられている。センサの設置場所は
進行側面又は上部とする場合が多い。進行側面から人体
を検知する方法は複数の人間が横並びに歩行している場
合、これを1人として計数するため精度が良くない。そ
のため−窓以上の精度を必要とする場合は複数のセンサ
を進行上部に設置する方法が採用くれている。
Conventional methods for counting the number of people passing by at a predetermined location include methods using optical detection means, methods using infrared sensors, and methods using ultrasonic sensors. Attempts have also been made to use a plurality of the above-mentioned sensors to determine the direction in which a person is passing. The sensor is often installed on the side or above the vehicle. The method of detecting a human body from the side of the road is not very accurate because if multiple people are walking side by side, they are counted as one person. Therefore, if more precision than the window is required, the method of installing multiple sensors above the vehicle is being adopted.

特公昭57−59500は複数の赤外線センサを上方か
ら下向きに設置してそこを通過する人数を計数する方法
の発明に関する。すなわち第5図に示すように鉛直方向
に取り付けられた赤外線発光器AI及びA2から発せら
れた赤外光CI及びC2と、鉛直方向に対して一定の角
度をもって取り付けられた赤外線受光器81及びB2の
受光範囲であるDI及びB2が交錯する検知ゾーンEl
及びB2を設定し、当該検知ゾーンを人間が通過すると
赤外線受光器81及びB2はそれを検出する。そして+
31と82が検出する時間の先後により通過する方向を
判断する。赤外線センサは通路を横切る方向に平行2列
に40cm程度の間隔をもって設置し、通過する人間の
検出漏れが生じない様にする。
Japanese Patent Publication No. 57-59500 relates to the invention of a method for counting the number of people passing by by installing a plurality of infrared sensors from above downward. That is, as shown in FIG. 5, infrared light CI and C2 emitted from infrared light emitters AI and A2 mounted vertically, and infrared receivers 81 and B2 mounted at a certain angle with respect to the vertical direction. Detection zone El where DI and B2 intersect, which is the light receiving range of
and B2 are set, and when a person passes through the detection zone, the infrared receiver 81 and B2 detect it. And +
The direction of passage is determined based on the times detected by 31 and 82. The infrared sensors are installed in two parallel rows with an interval of about 40 cm across the passageway to prevent failure to detect people passing by.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかし、前記従来技術はそれぞれの発光器の光度特性の
バラツキと経年変化、及び受光器間の受光感度の差違に
よって隣合う光センサ間で相互干渉が生ずる。そのため
以下に記載する欠点を有する。
However, in the prior art, mutual interference occurs between adjacent optical sensors due to variations in luminous intensity characteristics of each light emitter and changes over time, and differences in light receiving sensitivity between the light receivers. Therefore, it has the following drawbacks.

(1)人間の進行方向の前後2列における光センサにお
いて必ずしも手前側の光センサが先にオンしない事態が
発生し、この場合は進行方向の判断に誤りが生ずる。
(1) Among the optical sensors in the two rows of front and rear rows in the direction of travel of a person, a situation occurs in which the front side optical sensor is not necessarily turned on first, and in this case, an error occurs in determining the direction of travel.

(2)40cm程度の間隔をもって設置されたセ、ンサ
の中間位置の下方をひとりの人間が通過する場合、左右
両方のセンサが当該同一人を個々に検出し2人として計
数する。
(2) When a person passes below the middle position of the sensors installed at an interval of about 40 cm, both the left and right sensors detect the same person individually and count them as two people.

(3)前記相互干渉を排除するためには受光器等の鉛直
方向に対する設置角度を一律に一定の角度の取り付ける
ことができず、設置及びその後の調整に多大の手間を必
要とする。
(3) In order to eliminate the mutual interference, it is not possible to uniformly install the light receiver, etc. at a constant angle with respect to the vertical direction, and a great deal of effort is required for installation and subsequent adjustment.

〔課題を解決するための手段〕[Means to solve the problem]

本出願に係る発明は上・記課題を解決し計数の精度を飛
躍的に高めるものである。すなわち、特定周波数の光を
発光する発光器と当該周波数の光を検出する受光器から
なる光センサであって反波数の異なるものを2種以上用
意する。人間力5歩行する通路の床から一定距離の高さ
に、同一周波数の光センサが前後又は左右に隣合わない
ようにして、通路を横切る方向に平行2列(A列及びB
列)に一定間隔をもって設置する。それぞれの光センサ
を構成する発光器の光束と受光器の検出感度は当該光セ
ンサ直下において立った状態の大人の肩部から頭部を検
出するように設定する0 そして平行する2列の光セン
サの検出時間がA列又はB列のいずれが先であったかを
みて通過する人間の進行方向を判断し、当該場所におけ
る通過人数を計数するのである。
The invention of this application solves the above problems and dramatically improves the accuracy of counting. That is, two or more types of optical sensors are prepared, each consisting of a light emitter that emits light of a specific frequency and a light receiver that detects light of the frequency, and that have different antiwave numbers. Human power 5 At a certain height from the floor of the walkway, optical sensors with the same frequency are placed in two parallel rows (row A and B
(rows) at regular intervals. The luminous flux of the light emitter and the detection sensitivity of the light receiver constituting each optical sensor are set to detect the shoulders to the head of an adult standing directly below the optical sensor, and two parallel rows of optical sensors. The direction of movement of passing people is determined based on whether the A or B line was detected first, and the number of people passing through the location is counted.

〔実施例〕〔Example〕

以下本発明に係る通過人数の計数方法の実施例について
説明する。
An embodiment of the method for counting the number of people passing by according to the present invention will be described below.

第1図は本発明に係る光センサの設置方法を示すもので
ある。光センサは通路上方部に通路を横切る方向に平行
2列(A列及びB列)に取り付ける。隣合う横方向の光
センサ取付間隔は20cm程度とし、通路の横幅に応じ
て光センサの取付個数を定める。各列の前後及び左右に
おいて隣合う光セッサは異なる周波数のものを使用する
。使用する光センサの周波数の種類は2以上とし、設置
する床面高さ及び光センサを構成する発光器と受光器の
指向性等を考慮して相互干すが生じないようにその数を
定める。光センサの床面設置高さが高ければ高いほど、
また指向性が広ければ広いほどそれに応じて使用する光
センサの周波数の種類を増やす必要がある。−例として
3種類の光センサを使用する場合は同一周波数のものを
2個おきに設置することとなる。
FIG. 1 shows a method of installing an optical sensor according to the present invention. The optical sensors are mounted above the passage in two parallel rows (row A and row B) in the direction across the passage. The distance between adjacent optical sensors in the horizontal direction is about 20 cm, and the number of optical sensors to be installed is determined according to the width of the passage. Adjacent optical sensors in the front and rear and left and right sides of each row use ones with different frequencies. The number of frequency types of the optical sensor to be used is two or more, and the number is determined in consideration of the installation floor height and the directivity of the light emitter and light receiver that make up the optical sensor so that mutual drying does not occur. The higher the installation height of the optical sensor on the floor, the more
Furthermore, the wider the directivity, the more it is necessary to increase the types of frequencies of the optical sensor used. - For example, if three types of optical sensors are used, one with the same frequency will be installed every second.

第2図は光センサの取付角度を説明するものである。同
一周波数の光センサがA列及びB列の列間相互において
干渉しないように設置しなければならない。そのためA
列の各光セッサとB列の各光センサはその先軸が鉛直方
向に対して一定の角度を有する様に傾けて設置する。そ
してその方向は光軸が互いに離背する向きとし、取付傾
斜角度は使用する光センサの指向性等に応じて鉛直線に
対して2°〜5′′ とする。
FIG. 2 explains the mounting angle of the optical sensor. The optical sensors having the same frequency must be installed so that they do not interfere with each other between the A and B rows. Therefore A
Each optical sensor in the row and each optical sensor in row B are installed so that their front axes are inclined at a constant angle with respect to the vertical direction. The direction is such that the optical axes are separated from each other, and the mounting inclination angle is set at 2° to 5'' with respect to the vertical line, depending on the directivity of the optical sensor used.

各光センサの検出感度はその直下に大人が立った時発光
器から出た光線が当該人間の肩部若しくは頭部に当たっ
て反射し、その反射光が受光器を作動(オン)させる様
に設定する。従って光センサの床上設置高さに応じて発
光器の発光光度及び受光器の受光感度を調整する必要が
ある。l 調整により一定身長以上の人間の通過のみを
計数し、例えば小人は計数の対象としないとすることも
可能である。
The detection sensitivity of each optical sensor is set so that when an adult stands directly below it, the light beam emitted from the light emitter hits the shoulder or head of the person and is reflected, and the reflected light activates (turns on) the light receiver. . Therefore, it is necessary to adjust the luminous intensity of the light emitter and the light receiving sensitivity of the light receiver depending on the installation height of the optical sensor above the floor. l It is also possible to count only the passage of people over a certain height by adjustment, and for example, to exclude small people from being counted.

第3図は本発明の制御構成ブロック図を示すものである
。光センサ(1,2)はここでは発光部及び受光部一体
型のものを使用しているがセバレト型のものでも良い。
FIG. 3 shows a control configuration block diagram of the present invention. Here, the optical sensors (1, 2) are of an integrated type with a light emitting part and a light receiving part, but they may be of a Sebaret type.

発振器(8)から供給される基準クロ、りを分周器(9
)に入力して基準クロックの1/2、l/4.1/8・
・・等の周波数、例えばfl及びf2の信号を作成する
。 fl若しくはf2は各光センサの発光素子(16)
を励起するためのドライバ(15)に入力される。発光
素子(16)から発射した光は当該光センサ直下に人間
が存在しない場合は床面で反射しその反射光が受光素子
にて検出される。しかしこの場合、その受光量は微弱で
あるので電圧比較器(14)は検知せず(オフ)と判断
する。人間が存在する場合は発光素子から発射した光は
当該人間の肩及び頭部に当たって反射しその反射光はレ
ンズで収束されて受光素子に受光され受光信号用のブリ
・アンプ(11)に入力される。一定倍率で増幅された
受光信号は当該周波数(fl又はf2)の帯域のみの信
号を通過させそれ以外の帯域の信号を遮断するバンド・
パス・フィルタ(12)を経由してメイン・アンプ(1
3)に入力され、一定倍率で電圧増幅される。
The reference clock supplied from the oscillator (8) is applied to the frequency divider (9).
) and input it to 1/2 of the reference clock, l/4.1/8.
..., for example, create signals of fl and f2. fl or f2 is the light emitting element (16) of each optical sensor
is input to a driver (15) for exciting the . The light emitted from the light emitting element (16) is reflected by the floor surface when there is no person directly under the light sensor, and the reflected light is detected by the light receiving element. However, in this case, since the amount of light received is weak, the voltage comparator (14) does not detect it (off). When a person is present, the light emitted from the light-emitting element hits the shoulder and head of the person and is reflected, and the reflected light is converged by a lens, received by the light-receiving element, and input into the optical amplifier (11) for the light-receiving signal. Ru. The received light signal that has been amplified at a constant magnification is a band that passes only the signal in the frequency band (fl or f2) and blocks the signals in other bands.
Main amplifier (1) via pass filter (12)
3), and the voltage is amplified at a constant magnification.

増幅された受光信号は電圧比較器(14〉により予め定
められた閾値電圧と比較されその値よりも大きければオ
ン・(人間あり)、小さければオフ(人間なし)と判断
する。全光センサのオン/オフ状態はインターフェイス
を経由して中央演算処理装置(以下rCPυ」という。
The amplified light reception signal is compared with a predetermined threshold voltage by a voltage comparator (14), and if it is larger than that value, it is judged to be on (person present), and if it is smaller, it is judged to be off (no person present). The on/off state is determined by the central processing unit (hereinafter referred to as rCPυ) via an interface.

〉が常時又は一定周期で監視している。CPUには共通
の信号線の下にメモリ(4及び5)が接続されている。
> is monitored constantly or at regular intervals. Memories (4 and 5) are connected to the CPU under a common signal line.

読み出し専用メモリ、ROM (4)は本発明に係わる
一制御プログラムと固定データを格納する。書き替え可
能なメモリRAM (5)は制御プログラムで使われる
パラメータ等の変動定数を格納したり、演算結果を一時
的に記憶しておくワーキング・メモリとして使用される
。表示装置(6)は通過人数の累計値を表示するもので
入場者数又は退場者数を個別に表示したり、入場者数か
ら退場者数を減じた在留者を表示する。百貨店等入退場
口が複数存在する所では個々の入退場口での通過人数を
集計する必要があることから通信インターフェース(7
)を介して構内通信回線で中央のホスト・コンピュータ
へ当該データを送信する。
A read-only memory, ROM (4), stores a control program and fixed data related to the present invention. The rewritable memory RAM (5) is used as a working memory to store variation constants such as parameters used in the control program and to temporarily store calculation results. The display device (6) displays the cumulative number of people passing by, and displays the number of people entering or leaving the venue individually, or displays the number of residents minus the number of people leaving the venue from the number of people entering. In places where there are multiple entrances and exits, such as department stores, it is necessary to tally the number of people passing through each entrance and exit, so communication interfaces (7
) to a central host computer over a local communication line.

第4図は同じ進行方向(n)にあるA列とB列の各光セ
ンサの作動状態を示した図である。まずA列の光センサ
がオンした後8列の光センサがオンし、そしてA列の光
センサがオフした後8列の光センサがオフした場合((
A)の場合)は人間の入場(A列側からB列側への通過
)と判断して入場者用計数カウンタをプラス1する。逆
の場合((B)の場合)は退場(B列側からA列側への
通過)と判断して退場者数計数カウンタをプラス1する
。先にオンした光センサが他方の光セッサに後れてオフ
した場合((C)の場合等)は人間が当該光センサ下に
立ち止まっている場合等なので計数の対象にはしない。
FIG. 4 is a diagram showing the operating state of each optical sensor in row A and row B, which are in the same traveling direction (n). First, the photosensors in row A turn on, then the photosensors in row 8 turn on, and then the photosensors in row A turn off, and then the photosensors in row 8 turn off ((
In the case of A), it is determined that a person has entered (passing from the side of row A to the side of row B), and the visitor counter is incremented by one. In the opposite case (case (B)), it is determined that the person is leaving (passing from row B side to row A side), and the exit number counter is incremented by 1. If the light sensor that was turned on first turns off after the other light sensor (such as in case (C)), this is not counted because a person is standing still under the light sensor.

本実例においては光センサを20センチ・メートル間隔
で設置した。大人の人間の前幅は通常40〜50センチ
・メートルなのでひとりの人間が通過する場合同時に2
個若しくは3個の光センサが作動する。またふたりの人
間が進行横方向に並んだ状態で通過する場合は同時に4
個から6個の光センサが作動するはずであるから計数値
はこのことを考慮して決める。1個のみの光センサが作
動した場合はこれをノイズとみなし無視する。これによ
り手の動きなどによる誤検出が排除される。
In this example, optical sensors were installed at intervals of 20 centimeters. The frontal width of an adult human is usually 40 to 50 cm, so when one person passes, two
or three optical sensors are activated. Also, if two people pass side by side in the horizontal direction, 4
Since from 1 to 6 optical sensors are expected to operate, the count value is determined taking this into consideration. If only one optical sensor is activated, this is regarded as noise and ignored. This eliminates false detections caused by hand movements, etc.

次に複数の人間が進行方向に密着した状態で歩行した場
合を考える。人間が所定の速度(通常よりも比較的遅い
歩行速度)で歩行するには、先に歩行する人間の頭若し
くは肩部とその後に歩行する人間の頭若しくは肩部との
隙間は少なくとも20〜30センチ・メートル保たれて
いる。従って光センサのオン状態を示す波形(第4図)
は、2以上の人間が密着して歩行した場合でも決してフ
ラットになることがなく CPUは個々の人間の頭若し
くは肩部を別個に認識できるのである。
Next, consider a case where multiple people walk in close contact with each other in the direction of travel. In order for a human to walk at a predetermined speed (relatively slower than normal walking speed), the gap between the head or shoulders of the person walking first and the head or shoulders of the person walking after is at least 20 to 30 mm. Centimeters are maintained. Therefore, the waveform indicating the ON state of the optical sensor (Figure 4)
The system never becomes flat even when two or more people walk closely together, and the CPU can recognize each person's head or shoulders separately.

〔発明の効果〕〔Effect of the invention〕

本発明は従来技術が有していた種々の問題点を解決し以
下の通りの効果を生ぜしめた。
The present invention solves various problems that the prior art had and produces the following effects.

(+)進行方向前後にある光センサの相互干渉を排除す
ることができたため、進行方向手前列の光セッサが必ず
先にオンすることとなり進行方向の判断の誤りがなくな
った。これにより計数の精度が高まった。
(+) Since it was possible to eliminate mutual interference between the optical sensors located before and after the traveling direction, the optical sensors in the front row in the traveling direction were always turned on first, eliminating errors in determining the traveling direction. This increased the accuracy of counting.

(2)上記効果(1)と同じ理由で進行方向前後に2以
上の人間が密着した状態で歩行した場合でも必ずその隙
間を検出することが可能となり計数の精度を高めること
ができた。
(2) For the same reason as effect (1) above, even if two or more people walk in close contact with each other in the direction of travel, it is possible to always detect the gap between them, and the accuracy of counting can be improved.

(3)進歩横方向の光センサ間の相互干渉を排除するこ
とができたため、同列2個若しくは3個の光センサが同
時に作動(オン)した場合を1人、同列4個から6個の
光センサが同時に作動(オン)した場合を2人と計数す
ることが可能となり計数の精度を高めることができた。
(3) Progress Since we were able to eliminate mutual interference between optical sensors in the horizontal direction, when two or three optical sensors in the same row are activated (turned on) at the same time, one person can receive light from four to six optical sensors in the same row. It became possible to count the cases where two sensors were activated (turned on) at the same time, increasing the accuracy of counting.

(4)前後及び左右の光センサ間において相互干渉が生
じないので光センサの設置及び調整が容易となった。
(4) Since no mutual interference occurs between the front and rear and left and right optical sensors, installation and adjustment of the optical sensors is facilitated.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係る光センサの設置方法、第2図は本
発明における光センサの取付角度、第3図は本発明の制
御構成ブロック図、第4図は光センサの作動とその判断
を説明する図、そして第5図は従来技術の赤外線センサ
を使用した通過人数の計数方法を説明する図である。 出願代理人   斉藤 勲 jJI++i、$→も咽に葆る九tノブの類J!:、1
3亭tra   $!6叫ト15す・6光七Jプつ、孕
イナ町屓−AjjlS&る −589− i走に教カ計歇か大
Fig. 1 shows the method of installing the optical sensor according to the present invention, Fig. 2 shows the mounting angle of the optical sensor according to the invention, Fig. 3 is a block diagram of the control configuration of the invention, and Fig. 4 shows the operation of the optical sensor and its judgment. and FIG. 5 is a diagram explaining a method of counting the number of people passing by using a conventional infrared sensor. Application agent: Isao Saito JI++i, $→ It's like a nine-touch knob that makes you sick to your throat! :, 1
3-tei tra $! 6 shouts 15s 6 lights 7 J putsu, pregnant ina town-AjjlS & Ru-589- Is it a plan to teach i running?

Claims (1)

【特許請求の範囲】 人間が歩行する通路の床から一定距離の高さに、特定周
波数の光を発光する発光器と当該周波数の光を検知する
受光器からなる光センサであって周波数の異なるものを
2種以上用いて、 同一周波数の光センサが前後又は左右に隣合わないよう
に、通路を横切る方向に平行2列に一定間隔をもって設
置し、 それぞれの光センサの検出感度を当該光センサ直下にお
いて立った状態の大人の肩部から頭部を検出するように
設定し、 前記平行する2列の光センサの検出時間の先後により通
過する人間の移動方向を判断することからなる通過人数
の計数方法。
[Scope of Claims] An optical sensor consisting of a light emitter that emits light of a specific frequency and a light receiver that detects the light of the frequency, which is placed at a certain height from the floor of a passage where people walk, and has different frequencies. Two or more kinds of optical sensors are used, and the optical sensors with the same frequency are installed in two parallel rows at a certain interval in the direction across the aisle so that they are not adjacent to each other in the front and back or left and right, and the detection sensitivity of each optical sensor is determined by the detection sensitivity of the optical sensor. The system is set to detect the head of an adult standing directly below from the shoulder area, and the direction of movement of the passing person is determined based on the detection time of the two parallel rows of optical sensors. Counting method.
JP33679489A 1989-12-27 1989-12-27 Passenger counting method Expired - Fee Related JP2963125B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33679489A JP2963125B2 (en) 1989-12-27 1989-12-27 Passenger counting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33679489A JP2963125B2 (en) 1989-12-27 1989-12-27 Passenger counting method

Publications (2)

Publication Number Publication Date
JPH03201179A true JPH03201179A (en) 1991-09-03
JP2963125B2 JP2963125B2 (en) 1999-10-12

Family

ID=18302747

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33679489A Expired - Fee Related JP2963125B2 (en) 1989-12-27 1989-12-27 Passenger counting method

Country Status (1)

Country Link
JP (1) JP2963125B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0828233A2 (en) * 1996-09-04 1998-03-11 Matsushita Electric Industrial Co., Ltd. Apparatus for detecting the number of passers
JP2010230443A (en) * 2009-03-26 2010-10-14 Japan Research Institute Ltd Direction detecting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0828233A2 (en) * 1996-09-04 1998-03-11 Matsushita Electric Industrial Co., Ltd. Apparatus for detecting the number of passers
US5866887A (en) * 1996-09-04 1999-02-02 Matsushita Electric Industrial Co., Ltd. Apparatus for detecting the number of passers
EP0828233A3 (en) * 1996-09-04 1999-12-29 Matsushita Electric Industrial Co., Ltd. Apparatus for detecting the number of passers
JP2010230443A (en) * 2009-03-26 2010-10-14 Japan Research Institute Ltd Direction detecting device

Also Published As

Publication number Publication date
JP2963125B2 (en) 1999-10-12

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