JP2015197780A - vehicle detection and vehicle number recognition device - Google Patents

vehicle detection and vehicle number recognition device Download PDF

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JP2015197780A
JP2015197780A JP2014075112A JP2014075112A JP2015197780A JP 2015197780 A JP2015197780 A JP 2015197780A JP 2014075112 A JP2014075112 A JP 2014075112A JP 2014075112 A JP2014075112 A JP 2014075112A JP 2015197780 A JP2015197780 A JP 2015197780A
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vehicle number
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JP6431271B2 (en
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順一 ▲あべ▼木
順一 ▲あべ▼木
Junichi Abeki
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Mitsubishi Precision Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a device capable of performing detection of a vehicle and recognition of a number plate with a single device.SOLUTION: The device comprises: a plurality of cameras which are disposed with a predetermined space therebetween to perform photographing at the same time; a distance calculation unit which calculates a distance between the cameras and a photographed object on the basis of a plurality of images photographed by the plurality of cameras to output distance information; and a vehicle number recognition unit which performs operation of recognizing characters on a number plate on the basis of at least one photographed image photographed by the plurality of cameras and having the distance in the distance information obtained by the distance calculation unit within a predetermined range to output character recognition success/failure information indicating whether the recognition succeeded or not and vehicle number information recognized when the character recognition succeeded. The vehicle number of the vehicle is determined when the vehicle number recognition unit succeeded in the recognition of the vehicle number and it is determined that the presence of the vehicle is detected.

Description

本発明は、駐車場に入出場する車両の検知及び車両番号認識装置に関するものである。   The present invention relates to a detection and vehicle number recognition device for vehicles entering and leaving a parking lot.

従来、駐車場において車両の入場または出場を検知するために、例えば、路面または車室の地下に埋設したループコイルにより、車両通過の際のインダクタンスの変化を電気的に検出する方式または投光器と受光器を組み合わせて車体による光の遮蔽又は反射を検出する方式あるいは超音波を発射し反射波が返るまでの時間を計測する方式が用いられていた。
また、車両番号を認識するため、従来、車両番号を撮影認識し、それを記録・管理して車両を特定し、不正を防止するため車両番号認識装置が用いられ、車両番号認識装置は、所定の位置に来た車両を撮影した画像について、車両番号認識装置が文字認識処理により車両番号を認識していた。車両番号認識装置は、車両検知装置とは異なる装置であり、別途用意して設置していた。 Conventionally, in order to detect entry or exit of a vehicle in a parking lot, for example, a loop coil embedded in a road surface or a basement of a passenger compartment, a method of electrically detecting a change in inductance when passing a vehicle or a projector and a light receiving device A method of detecting the shielding or reflection of light by the vehicle body by combining a vessel or a method of measuring the time until the reflected wave returns after emitting an ultrasonic wave has been used.
Further, in order to recognize a vehicle number, a vehicle number recognition device is conventionally used to capture and recognize a vehicle number, record and manage it to identify the vehicle, and prevent fraud. The vehicle number recognition device has recognized the vehicle number by the character recognition process for the image obtained by photographing the vehicle that has come to the position. The vehicle number recognition device is a device different from the vehicle detection device, and is prepared and installed separately.

このように、従来の方式によると、（１）ナンバープレートを認識する車両番号認識装置と車両検知装置とがそれぞれ必要となる、（２）従って、車室毎に入庫と出庫を管理するコインパークでは、車両番号認識装置と車両検知装置とその設置工事のコストが高価なものとなる、などの問題がある。
また、車番認識のための画像は、カメラと車両との距離が重要であるが、上記従来の車両検知器は、いずれもカメラと車両との距離を測る機能はなく、ゲート装置を設けて適切な距離で車両を停止させ、画像を撮影するものとなっていた。車両の走行を規制せずに車両番号を認識する装置も実用化されているが、高速に撮影して文字認識を行うために高い性能が必要であり、コストが高い問題がある。 As described above, according to the conventional method, (1) a vehicle number recognition device and a vehicle detection device for recognizing a license plate are required, respectively. (2) Accordingly, a coin park for managing entry and exit for each vehicle compartment However, there is a problem that the vehicle number recognition device, the vehicle detection device, and the cost of the installation work are expensive.
In addition, in the image for vehicle number recognition, the distance between the camera and the vehicle is important. However, none of the conventional vehicle detectors have a function of measuring the distance between the camera and the vehicle, and a gate device is provided. The vehicle was stopped at an appropriate distance and an image was taken. An apparatus for recognizing a vehicle number without restricting the traveling of the vehicle has been put into practical use. However, high performance is necessary to perform character recognition by shooting at high speed, and there is a problem of high cost.

特開２００７−３１７０９８号公報JP 2007-317098 A

駐車場へ入場する車両または駐車場から出場する車両を特定するために、車両のナンバープレートを文字認識する装置が利用されているが、車両の入場及び出場を検知する装置と、ナンバープレートを認識する装置は、設置場所とともにそれぞれ必要であった。
本発明が解決しようとする課題は、一つの装置で車両検知とナンバープレートの認識が可能な装置を提案することである。 A device that recognizes the license plate of the vehicle is used to identify the vehicle that enters the parking lot or the vehicle that enters the parking lot, but the device that detects the entrance and exit of the vehicle and the license plate are recognized. The equipment to be installed was necessary together with the installation location.
The problem to be solved by the present invention is to propose a device capable of vehicle detection and license plate recognition with a single device.

請求項１に係る車両検知及び車両番号認識装置は、所定の間隔で配置して同時に撮影する複数のカメラと、前記複数のカメラで撮影した複数の画像に基づいてカメラと撮影した物体との距離を算出して距離情報を出力する距離算出部と、前記複数のカメラで撮影し、かつ前記距離算出部で得られた距離情報が所定範囲の距離である、少なくとも１枚の撮像画像に基づいてナンバープレートの文字認識動作を行い認識に成功したか否かの文字認識成否情報と文字認識が成功したときの認識した車両番号情報とを出力する車両番号認識部とを備え、前記車両番号認識部が、車両番号の認識に成功したとき、車両の存在を検知したものとし、当該車両の車番を決定することを特徴とするものである。   The vehicle detection and vehicle number recognition device according to claim 1 is a distance between a plurality of cameras arranged at predetermined intervals and simultaneously photographed, and a camera and an object photographed based on a plurality of images photographed by the plurality of cameras. A distance calculation unit that calculates distance information and outputs distance information; and based on at least one captured image that is captured by the plurality of cameras and the distance information obtained by the distance calculation unit is a distance within a predetermined range. A vehicle number recognizing unit that outputs character recognition success / failure information indicating whether or not the recognition is successful by performing character recognition operation of the license plate, and vehicle number information recognized when the character recognition is successful. However, when the vehicle number is successfully recognized, the presence of the vehicle is detected, and the vehicle number of the vehicle is determined.

請求項２に係る車両検知及び車両番号認識装置は、請求１に記載のものにおいて、距離算出部は、距離情報を２次元の距離情報として出力し、車両番号認識部は、距離算出部と情報を授受可能に構成し、距離算出部から前記２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させて、候補領域切り出し部が距離が所定の値より小さい部分の領域をナンバープレート候補領域として撮像画像から切り出した領域に対して、車両番号の認識動作を行うことを特徴とするものである。   The vehicle detection and vehicle number recognition apparatus according to claim 2 is the apparatus according to claim 1, wherein the distance calculation unit outputs the distance information as two-dimensional distance information, and the vehicle number recognition unit includes the distance calculation unit and the information. The two-dimensional distance information and the captured image are made to correspond to each other at the same scale from the distance calculation unit, and the candidate region cutout unit counts the region where the distance is smaller than a predetermined value. A vehicle number recognition operation is performed on an area cut out from a captured image as a candidate area.

請求項３に係る車両検知装置は、所定の間隔で配置して同時に撮影する複数のカメラと、前記複数のカメラで撮影した複数の画像に基づいてカメラと撮影した物体との距離を算出して距離情報を出力する距離算出部と、前記複数のカメラで撮影し、かつ前記距離算出部で得られた距離情報が所定範囲の距離である、少なくとも１枚の撮像画像に基づいてナンバープレートが前記画像内に存在するか否かのナンバープレート存否情報を出力するナンバープレート認識部とを備え、前記ナンバープレート認識部が、ナンバープレートが存在すると判定したとき車両の存在を検知することを特徴とするものである。   According to a third aspect of the present invention, there is provided a vehicle detection device that calculates a distance between a plurality of cameras that are arranged at predetermined intervals and simultaneously photographed and a plurality of images photographed by the plurality of cameras and the photographed object. A distance calculation unit that outputs distance information; and a license plate that is photographed by the plurality of cameras, and the distance information obtained by the distance calculation unit is a distance within a predetermined range based on at least one captured image. A license plate recognition unit that outputs license plate presence / absence information indicating whether or not the license plate exists in the image, and the license plate recognition unit detects the presence of the vehicle when it is determined that the license plate exists. Is.

請求項４に係る車両検知装置は、請求項３に記載のものにおいて、距離算出部は、距離情報を２次元の距離情報として出力し、ナンバープレート認識部は、距離算出部と情報を授受可能に構成し、距離算出部から前記２次元の距離情報を入力し、２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させて、候補領域切り出し部が距離が所定の値より小さい部分の領域を撮像画像から切り出した領域に対して、ナンバープレートが存在するか否かの認識動作を行うことを特徴とするものである。   According to a fourth aspect of the present invention, in the vehicle detection device according to the third aspect, the distance calculation unit outputs the distance information as two-dimensional distance information, and the license plate recognition unit can exchange information with the distance calculation unit. The two-dimensional distance information is input from the distance calculation unit, the two-dimensional distance information and the captured image are made to correspond to each other at the same scale, and the candidate area cutout unit has a distance smaller than a predetermined value. A recognition operation of whether or not a license plate exists is performed on an area obtained by cutting out a partial area from a captured image.

請求項１に係る車両検知及び車両番号認識装置によると、車両番号認識部が、車両番号の認識に成功したとき、車両の存在を検知したものとし、当該車両の車番を決定するから、車両の存在と車両番号を同時に認識できる。また、車両が所定の距離に位置するとき撮影するためのゲート装置が不要となる。また、距離算出部で得られた距離情報が所定範囲の距離である、少なくとも１枚の撮像画像に基づいてナンバープレートの文字認識動作を行うから、適切な距離で撮影した画像を用いることができ、ナンバープレートの認識処理を行うことができるため、認識の精度を向上させることができる。   According to the vehicle detection and vehicle number recognition apparatus according to claim 1, when the vehicle number recognition unit succeeds in recognizing the vehicle number, it is assumed that the presence of the vehicle is detected, and the vehicle number of the vehicle is determined. And the vehicle number can be recognized at the same time. Further, a gate device for photographing when the vehicle is located at a predetermined distance is not necessary. Further, since the distance information obtained by the distance calculation unit is a distance within a predetermined range, the license plate character recognition operation is performed based on at least one captured image, so an image taken at an appropriate distance can be used. Since the license plate recognition process can be performed, the recognition accuracy can be improved.

請求項２に係る車両検知及び車両番号認識装置によると、距離算出部が距離情報を２次元の距離情報として出力し、車両番号認識部が距離算出部から前記２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させて、候補領域切り出し部が距離が所定の値より小さい部分の領域を撮像画像から切り出した領域に対して、車両番号の認識動作を行うから、精度よく、また短い時間で車番番号の認識を行うことができる。   According to the vehicle detection and vehicle number recognition apparatus according to claim 2, the distance calculation unit outputs the distance information as two-dimensional distance information, and the vehicle number recognition unit receives the two-dimensional distance information and the captured image from the distance calculation unit. Since the candidate area cutout unit performs an operation of recognizing the vehicle number for the area in which the area where the distance is smaller than the predetermined value is cut out from the captured image in correspondence with each other so as to overlap at the same scale, The car number can be recognized in a short time.

請求項３に係る車両検知装置によると、車両の存置を、複数のカメラと、距離算出部が当該カメラで撮影した複数の画像に基づいてカメラと撮影した物体との距離を算出し、ナンバープレート認識部において、距離情報が所定範囲の距離である、少なくとも１枚の撮像画像に基づいてナンバープレートが前記画像内に存在するか否かにより、車両の存在を検知するから、車両検知が可能な車両検知装置を実現することができる。   According to the vehicle detection device according to claim 3, the number of the vehicle is determined by calculating the distance between the camera and the photographed object based on the plurality of cameras and the plurality of images photographed by the distance calculation unit by the camera. Since the recognition unit detects the presence of the vehicle based on whether or not the license plate exists in the image based on at least one captured image whose distance information is a distance within a predetermined range, the vehicle can be detected. A vehicle detection device can be realized.

請求項４に係る車両検知装置によると、距離算出部が距離情報を２次元の距離情報として出力し、車両番号認識部が距離算出部から前記２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させて、候補領域切り出し部が距離が所定の値より小さい部分の領域を撮像画像から切り出した領域に対して、ナンバープレートが存在するか否かの認識動作を行うから、精度よく、また短い時間で車両検知を行うことができる。   According to the vehicle detection device of the fourth aspect, the distance calculation unit outputs the distance information as two-dimensional distance information, and the vehicle number recognition unit outputs the two-dimensional distance information and the captured image from the distance calculation unit at the same scale. The candidate region cutout unit recognizes whether or not there is a license plate for the region where the region whose distance is smaller than the predetermined value is cut out from the captured image in correspondence with each other so as to overlap. In addition, vehicle detection can be performed in a short time.

車両検知及び車両番号認識装置の一実施例の機能ブロック図である。It is a functional block diagram of one Example of a vehicle detection and vehicle number recognition apparatus.

図１は、本発明の車両検知及び車両番号認識装置の一実施例の機能ブロック図であって、１０１ａ，１０１ｂはカメラ、１０２は距離算出部であり、距離算出と、距離データを２次元化して出力する機能を有する。１０３１はナンバープレート認識部であり、ナンバープレート探索機能を有するとともに前記距離算出部１０２と情報を授受可能に構成する。１０３２は車番認識部であり、文字認識機能を有するとともに前記距離算出部１０２と情報を授受可能に構成する。１０３３は候補領域切り出し部であり、ナンバープレートの候補領域切り出し機能を有する。１０４は全体を制御する制御部である。   FIG. 1 is a functional block diagram of an embodiment of a vehicle detection and vehicle number recognition apparatus according to the present invention, wherein 101a and 101b are cameras, 102 is a distance calculation unit, and distance calculation and distance data are two-dimensionalized. Output function. Reference numeral 1031 denotes a license plate recognition unit which has a license plate search function and can exchange information with the distance calculation unit 102. Reference numeral 1032 denotes a vehicle number recognition unit which has a character recognition function and can exchange information with the distance calculation unit 102. Reference numeral 1033 denotes a candidate area cutout unit, which has a license plate candidate area cutout function. A control unit 104 controls the whole.

（距離測定）
カメラ１０１ａ，１０１ｂ及び距離算出部１０２は、距離を測定でき、画像を撮像できる装置として機能する。２台のカメラ１０１ａ，１０１ｂは、ステレオカメラを構成し、所定の間隔で配置され、同時に撮影した２枚の画像中で同一物体の特徴ある点、あるいは線を特定し、三角測量の原理でカメラと物体間の距離を測定することができる。ゲート式駐車場に用いる場合、ステレオカメラの２台のカメラ１０１ａ，１０１ｂを、駐車場の入口及び出口に設置し、車両が近づく方向へ向ける。コインパーク駐車場に用いる場合、ステレオカメラの２台のカメラ１０１ａ，１０１ｂを、車室の奥に設置し、車両が近づく方向へ向ける。 (Distance measurement)
The cameras 101a and 101b and the distance calculation unit 102 function as devices that can measure a distance and capture an image. The two cameras 101a and 101b constitute a stereo camera, are arranged at predetermined intervals, specify characteristic points or lines of the same object in two images taken at the same time, and are based on the principle of triangulation And the distance between objects can be measured. When used in a gate-type parking lot, two cameras 101a and 101b of stereo cameras are installed at the entrance and exit of the parking lot and are directed in the direction in which the vehicle approaches. When used in a coin park parking lot, the two cameras 101a and 101b of the stereo camera are installed in the back of the passenger compartment and are directed toward the vehicle.

（車両検知及び車両番号認識動作）
カメラ１０１ａ，１０１ｂの前方に来た物体はカメラ１０１ａ，１０１ｂにより撮影される。距離算出部１０２は、撮影された車両等の物体とカメラ１０１ａ，１０１ｂの距離を測定算出し、距離情報を制御部１０４に出力する。制御部１０４は距離情報による距離が所定の範囲内にあって物体が存在するか判定する。もし車両が前記範囲内に進入してきた場合、制御部１０４は、ナンバープレートの認識処理を行う上で最適な距離まで待って、カメラ１０１ａ又は１０１ｂのいずれかの撮像画像について前記最適な距離における少なくとも１枚の撮像画像をナンバープレート認識部１０３１及び車両番号認識部１０３２に受信させる。ナンバープレート認識部１０３１は、撮像した画像に対して、ナンバープレートが存在するか調べる。例えば、ナンバープレートに表示することが定められている「地域名」、「分類番号」、「平仮名等」及び「一連指定番号」の相互の位置関係ならびにそれぞれの文字の大きさと配置を特徴とするパターンを用いてパターンマッチングにより調べることにより、対象画像内にナンバープレートが存在するか調べることができる。画像中にナンバープレートが存在しない場合は、車両でないと判定する。ナンバープレートが存在し、更に車両番号認識部１０３２が車両番号の認識に成功したとき、車両を検知し、かつ車両番号が得られている。ナンバープレートは存在するが、汚れや直射日光の入射などの影響で車両番号は認識できなかった場合も、車両の存在はできている。物体が車両の場合そのナンバープレートについて文字認識動作すなわち車両番号の認識動作を行う。車両番号認識部１０３２がナンバープレートの文字認識に成功したか否かの文字認識成否情報を制御部１０４に送る。制御部１０４は、文字認識成否情報を受け、ナンバープレートの文字認識すなわち車両番号の認識に成功したものであるときは、車両の存在を検知したものとし、そのとき物体を車両としその車両番号を決定する。決定された車番は、車両検知時刻とともに、図示しないデータ記憶手段の所定領域に記録される。
この車両番号認識部１０３２における車両番号認識は、例えば、次のように行う。距離算出部１０２は、複数の特徴ある点または線に対して、三角測量の原理により距離を測定することにより、撮像画像についての２次元の距離情報として車両番号認識部１０３２に出力する。車両番号認識部１０３２は、ナンバープレートの認識処理を行う上で最適な距離を例えば、撮像画像の所定領域が示す距離情報の平均から判定する。車両番号認識部１０３２は、その平均の値が示す距離情報が認識処理を行う上で最適な距離であるときに、その時の前記距離算出部１０２からの前記２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させる。候補領域切り出し部１０３３は、前記重なるように対応された距離が、ナンバープレートが位置するであろうと考えられる所定の値より小さい部分の領域をナンバープレート候補領域として撮像画像から切り出す。車両番号認識部１０３２は、所定の値より小さい部分が、車両の先頭すなわちナンバープレート部分に相当すると判断し、切り出した領域について車両番号の認識動作を行う。 (Vehicle detection and vehicle number recognition operation)
Objects that come in front of the cameras 101a and 101b are photographed by the cameras 101a and 101b. The distance calculation unit 102 measures and calculates the distance between the photographed object such as a vehicle and the cameras 101 a and 101 b and outputs the distance information to the control unit 104. The control unit 104 determines whether the distance based on the distance information is within a predetermined range and an object exists. If the vehicle has entered the range, the control unit 104 waits for an optimum distance for performing the license plate recognition process, and at least at the optimum distance for the captured image of either the camera 101a or 101b. One picked-up image is received by the license plate recognition unit 1031 and the vehicle number recognition unit 1032. The license plate recognition unit 1031 checks whether a license plate exists for the captured image. For example, it is characterized by the mutual positional relationship of “area name”, “classification number”, “Hiragana etc.” and “serial designation number” that are specified to be displayed on the license plate, and the size and arrangement of each character. By examining by pattern matching using a pattern, it is possible to examine whether a license plate exists in the target image. When there is no license plate in the image, it is determined that the vehicle is not a vehicle. When the license plate exists and the vehicle number recognition unit 1032 succeeds in recognizing the vehicle number, the vehicle is detected and the vehicle number is obtained. The license plate exists, but the vehicle can be present even if the vehicle number cannot be recognized due to the influence of dirt, direct sunlight, or the like. When the object is a vehicle, a character recognition operation, that is, a vehicle number recognition operation is performed on the license plate. Character recognition success / failure information indicating whether or not the vehicle number recognition unit 1032 has successfully recognized the license plate characters is sent to the control unit 104. The control unit 104 receives the character recognition success / failure information, and when it succeeds in the character recognition of the license plate, that is, the recognition of the vehicle number, it is assumed that the presence of the vehicle is detected. decide. The determined vehicle number is recorded in a predetermined area of data storage means (not shown) together with the vehicle detection time.
The vehicle number recognition in the vehicle number recognition unit 1032 is performed as follows, for example. The distance calculation unit 102 measures the distance of a plurality of characteristic points or lines by the principle of triangulation, and outputs the distance to the vehicle number recognition unit 1032 as two-dimensional distance information about the captured image. The vehicle number recognizing unit 1032 determines the optimum distance for performing license plate recognition processing from, for example, the average of distance information indicated by a predetermined area of the captured image. When the distance information indicated by the average value is an optimum distance for the recognition process, the vehicle number recognition unit 1032 uses the same two-dimensional distance information from the distance calculation unit 102 as the captured image. Correspond so as to overlap at the scale of. The candidate area cutout unit 1033 cuts out an area of a portion where the distance corresponding to the overlap is smaller than a predetermined value that the license plate is supposed to be located as a license plate candidate area from the captured image. The vehicle number recognizing unit 1032 determines that the portion smaller than the predetermined value corresponds to the head of the vehicle, that is, the license plate portion, and performs the vehicle number recognition operation for the cut out region.

（車両検知動作）
カメラ１０１ａ，１０１ｂの前方に来た物体はカメラ１０１ａ，１０１ｂにより撮影される。距離算出部１０２は、撮影された車両等の物体とカメラ１０１ａ，１０１ｂの距離を測定算出し、距離情報を制御部１０４に出力する。制御部１０４は物体との距離が所定の範囲内であるか前記距離情報により判定する。もし車両が前記範囲内に進入してきた場合、制御部１０４は、ナンバープレートの認識処理を行う上で最適な距離まで待って、カメラ１０１ａ又は１０１ｂのいずれかの撮像画像について前記最適な距離における少なくとも１枚の撮像画像をナンバープレート認識部１０３１に受信させる。ナンバープレート認識部１０３１は、車両のナンバープレートが前記画像内に存在するか否かについてナンバープレート存否の探索動作を行う。ナンバープレート認識部１０３１がナンバープレートの存否探索に成功したか否かのナンバープレート存否情報を制御部１０４に送る。制御部１０４は、ナンバープレート存否情報を受け、画像内にナンバープレートが存在するものであるときは、その物体を車両とし、車両の存在を検知したものとする。
このナンバープレート認識部１０３１におけるナンバープレート存否の探索は、例えば、次のように行う。距離算出部１０２は、複数の特徴ある点または線に対して、三角測量の原理により距離を測定することにより、撮像画像についての２次元の距離情報としてナンバープレート認識部１０３１に出力する。ナンバープレート認識部１０３１は、ナンバープレートの探索処理を行う上で最適な距離を例えば、撮像画像の所定領域が示す距離情報の平均から判定する。ナンバープレート認識部１０３１は、その平均の値が示す距離情報が認識処理を行う上で最適な距離であるときに、その時の前記距離算出部１０２からの前記２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させる。候補領域切り出し部１０３３は、前記重なるように対応された距離が所定の値より小さい部分の領域をナンバープレート候補領域として撮像画像から切り出す。ナンバープレート認識部１０３１は、所定の値より小さい部分が、車両の先頭すなわちナンバープレート部分に相当すると判断し、切り出した領域についてナンバープレートの存否探索を行う。例えば、ナンバープレートに表示することが定められている「地域名」、「分類番号」、「平仮名等」及び「一連指定番号」の相互の位置関係ならびにそれぞれの文字の大きさと配置を特徴とするパターンを用いてパターンマッチングにより調べることにより、対象画像内にナンバープレートが存在するか調べることができる。 (Vehicle detection operation)
Objects that come in front of the cameras 101a and 101b are photographed by the cameras 101a and 101b. The distance calculation unit 102 measures and calculates the distance between the photographed object such as a vehicle and the cameras 101 a and 101 b and outputs the distance information to the control unit 104. The control unit 104 determines whether the distance to the object is within a predetermined range based on the distance information. If the vehicle has entered the range, the control unit 104 waits for an optimum distance for performing the license plate recognition process, and at least at the optimum distance for the captured image of either the camera 101a or 101b. The license plate recognition unit 1031 receives one captured image. The license plate recognizing unit 1031 performs a license plate presence / absence search operation as to whether or not a vehicle license plate exists in the image. The license plate recognition unit 1031 sends to the control unit 104 license plate presence / absence information indicating whether or not the license plate presence / absence search has succeeded. The control unit 104 receives the license plate presence / absence information, and when the license plate is present in the image, the control unit 104 assumes that the object is a vehicle and detects the presence of the vehicle.
The search for the presence / absence of the license plate in the license plate recognition unit 1031 is performed as follows, for example. The distance calculation unit 102 measures the distance based on the principle of triangulation for a plurality of characteristic points or lines, and outputs the distance to the license plate recognition unit 1031 as two-dimensional distance information about the captured image. The license plate recognition unit 1031 determines the optimum distance for performing the license plate search process from, for example, an average of distance information indicated by a predetermined region of the captured image. When the distance information indicated by the average value is the optimum distance for the recognition process, the license plate recognition unit 1031 uses the same two-dimensional distance information from the distance calculation unit 102 as the captured image. Correspond so as to overlap at the scale of. The candidate area cutout unit 1033 cuts out an area of a portion whose distance corresponding to the overlap is smaller than a predetermined value as a license plate candidate area from the captured image. The license plate recognition unit 1031 determines that the portion smaller than the predetermined value corresponds to the head of the vehicle, that is, the license plate portion, and searches for the existence of the license plate for the cut out region. For example, it is characterized by the mutual positional relationship of “area name”, “classification number”, “Hiragana etc.” and “serial designation number” that are specified to be displayed on the license plate, and the size and arrangement of each character. By examining by pattern matching using a pattern, it is possible to examine whether a license plate exists in the target image.

１０１ａ カメラ
１０１ｂ カメラ
１０２ 距離算出部
１０３１ ナンバープレート認識部
１０３２ 車両番号認識部
１０４ 制御部
101a camera 101b camera 102 distance calculation unit 1031 license plate recognition unit 1032 vehicle number recognition unit 104 control unit

Claims (4)

所定の間隔で配置して同時に撮影する複数のカメラと、
前記複数のカメラで撮影した複数の画像に基づいてカメラと撮影した物体との距離を算出して距離情報を出力する距離算出部と、
前記複数のカメラで撮影し、かつ前記距離算出部で得られた距離情報が所定範囲の距離である、少なくとも１枚の撮像画像に基づいてナンバープレートの文字認識動作を行い認識に成功したか否かの文字認識成否情報と文字認識が成功したときの認識した車両番号情報とを出力する車両番号認識部とを備え、
前記車両番号認識部が、車両番号の認識に成功したとき、車両の存在を検知したものとし、当該車両の車番を決定することを特徴とする車両検知及び車両番号認識装置。 A plurality of cameras that are arranged at predetermined intervals and shoot at the same time;
A distance calculation unit that calculates a distance between the camera and an object photographed based on a plurality of images photographed by the plurality of cameras and outputs distance information;
Whether or not the license plate character recognition operation was successfully performed based on at least one captured image that was captured by the plurality of cameras and the distance information obtained by the distance calculation unit was a predetermined range of distance. A vehicle number recognition unit for outputting the character recognition success / failure information and the vehicle number information recognized when the character recognition is successful,
A vehicle detection and vehicle number recognition device characterized in that the vehicle number recognition unit detects the presence of a vehicle when the vehicle number is successfully recognized and determines the vehicle number of the vehicle. 距離算出部は、距離情報を２次元の距離情報として出力し、
車両番号認識部は、距離算出部と情報を授受可能に構成し、距離算出部から前記２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させて、候補領域切り出し部が距離が所定の値より小さい部分の領域をナンバープレート候補領域として撮像画像から切り出した領域に対して、車両番号の認識動作を行うことを特徴とする請求１に記載の車両検知及び車両番号認識装置。 The distance calculation unit outputs the distance information as two-dimensional distance information,
The vehicle number recognizing unit is configured to be able to exchange information with the distance calculating unit, and the distance calculating unit associates the two-dimensional distance information and the captured image so that they overlap at the same scale. 2. The vehicle detection and vehicle number recognition apparatus according to claim 1, wherein an operation of recognizing a vehicle number is performed on a region cut out from a captured image by using a region of a portion smaller than a predetermined value as a license plate candidate region. 所定の間隔で配置して同時に撮影する複数のカメラと、
前記複数のカメラで撮影した複数の画像に基づいてカメラと撮影した物体との距離を算出して距離情報を出力する距離算出部と、
前記複数のカメラで撮影し、かつ前記距離算出部で得られた距離情報が所定範囲の距離である、少なくとも１枚の撮像画像に基づいてナンバープレートが前記画像内に存在するか否かのナンバープレート存否情報を出力するナンバープレート認識部とを備え、
前記ナンバープレート認識部が、ナンバープレートが存在すると判定したとき車両の存在を検知することを特徴とする車両検知装置。 A plurality of cameras that are arranged at predetermined intervals and shoot at the same time;
A distance calculation unit that calculates a distance between the camera and an object photographed based on a plurality of images photographed by the plurality of cameras and outputs distance information;
A number indicating whether or not a license plate exists in the image based on at least one captured image that is captured by the plurality of cameras and the distance information obtained by the distance calculation unit is a distance within a predetermined range. A license plate recognition unit that outputs plate presence / absence information,
A vehicle detection device, wherein the license plate recognition unit detects the presence of a vehicle when it is determined that a license plate is present. 距離算出部は、距離情報を２次元の距離情報として出力し、
ナンバープレート認識部は、距離算出部と情報を授受可能に構成し、距離算出部から前記２次元の距離情報を入力し、２次元の距離情報と撮像画像を同一の縮尺で重なるように対応させて、候補領域切り出し部が距離が所定の値より小さい部分の領域を撮像画像から切り出した領域に対して、ナンバープレートが存在するか否かの認識動作を行うことを特徴とする請求３に記載の車両検知装置。
The distance calculation unit outputs the distance information as two-dimensional distance information,
The license plate recognition unit is configured to be able to exchange information with the distance calculation unit, input the two-dimensional distance information from the distance calculation unit, and associate the two-dimensional distance information and the captured image so as to overlap at the same scale. The candidate region cutout unit performs an operation of recognizing whether or not a license plate exists for an area obtained by cutting out an area whose distance is smaller than a predetermined value from the captured image. Vehicle detection device.
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