KR20080024287A - Vehicle number plate recognition system for wireless hand held - Google Patents

Abstract

A portable wireless number plate recognition system is provided to remove a dead zone for a camera by recognizing vehicles parked in two directions. A vehicle camera(101) is fixed on a patrol vehicle, takes images of number plates in real-time, and transmits the images to a computer. A first transceiver includes camcorder, a GPS(Global Positioning System) receiver, a code signal inserting unit, an encoder, an embedded modem, and a portable handheld device. A second transceiver(301) receives digital image signals from the first transceiver using an antenna. A screen divider(401) outputs a 2-channel image from the vehicle camera and the first transceiver on one screen. A vehicle compute(501) receives A/V(Audio/Video) signals from the first transceiver and separates an audio signal from a video signal. A number plate recognition unit analyzes the image from the vehicle camera or a portable camera to recognize the number of a vehicle.

Description

Portable wireless license plate recognition system {VEHICLE NUMBER PLATE RECOGNITION SYSTEM FOR Wireless HAND HELD}

1 is a view showing the configuration of a vehicle mounting apparatus of the present invention;

2 is a diagram illustrating a handheld wireless transceiver.

3 is a flowchart illustrating a method of displaying a position of a handheld radio transmitter;

4 is a flowchart illustrating a screen division display process;

5 is a flowchart illustrating a method of image recognition.

The present invention relates to a vehicle-mounted number recognition device, and more particularly, to a number recognition device that can detect various illegal vehicles while moving a vehicle.

In general, police officers who enforce crackdowns increase the efficiency of crackdowns by equipping vehicle license plates to detect all artillery vehicles, ie theft, arrears, and illegal vehicles that are not insured without paying taxes. It was only possible on these large, movable roads, and it was impossible to crack down on alleys or tightly packed cars.

In order to solve such a conventional problem, some use a license plate input device through a PDA, not a camera, but this method is inconvenient to manually enter the number manually by the police officers, and this could not even be fully featured.

Accordingly, an object of the present invention is to provide a method of providing and displaying a position coordinate to a vehicle computer simultaneously with transmitting a handheld camcorder image.

An object of the present invention is to provide a system for receiving a vehicle-mounted camera and a wireless handheld image at the same time and dividing it into two screens to recognize the license plate of the vehicle as one image.

In system configuration

1 is a view showing the configuration of a vehicle mounting apparatus of the present invention;

2 is a diagram illustrating a handheld wireless transceiver.

101 is a vehicle camera fixedly attached to a patrol vehicle that runs, and pan-tilt-driven, real-time photographing the license plate of the external vehicle and transmits the image to a computer mounted in the vehicle.

201 is a first transceiver, a camcorder unit 202 for generating real-time video and audio for wirelessly transmitting an image to the handheld; A GPS receiver 203 of the handheld wireless image transmission means for periodically generating a position coordinate value with a GPS for receiving a satellite and receiving a current position moving in real time; And a code signal insertion unit 204 having a frequency conversion module for converting the position coordinate signal into audio sound beats of a specific frequency in order to insert code values into a voice signal of the camcorder. And an encoder unit 205 for embedding a codec such as Mpeg4 or Mjpeg for transmitting a noise-resistant image to wirelessly transmit the A / V signal, and generating a streaming image by multiplexing a video signal and an audio signal. ; The internal signal is subjected to a specific compression process,

An internal modem unit 206 for modulating frequency amplification and amplification through a series of processes; It is a device that transmits a wireless signal through a portable antenna through a portable handheld device having a portable battery.

301 is a second transceiver as a second transceiver to configure the antenna to receive a digital video signal from the first transceiver 201 and a wireless video receiving modem (302) for transmitting and receiving a wireless signal; A decoder having a decoder 303 having a decoder for restoring a transmitted image is provided.

401 is a screen splitter which is used as a screen splitter and outputs two channels of images input from the camera from the handheld wireless video transmission means 201 to a single screen and is normally (OFF = Normal). Case is configured to only relay the signal.

501 is a vehicle computer, which is a kind of PC, has a video capture card inside, and in particular, obtains an A / V signal input from the handheld wireless transmitter 201 to separate the video signal and the audio signal, and through this, the license plate It is a computer with high performance processor, storage device and license plate recognition program for easy recognition.

601 is a license plate recognition software for recognizing one or both images of a license plate recognition S / W == vehicle-mounted camera or an image input through a portable camera, and is particularly inserted in the transmitted A / V signal. It is a computer software with built-in navigation map software that makes it possible to instantly display the location of license plate photographed in real time with an electronic map.

      Example

   3 is a flowchart illustrating a position display method of a handheld wireless transmitter.

In particular, a method of transmitting location information of the first transmitter / receiver 201 will be described. Generating satellite coordinates of the GPS receiver by switching on the handheld wireless transmitter (S10);

A code insertion step (S20) of converting and inserting the generated digital coordinate value into a frequency of a sound band corresponding to an audible frequency;

Through this step, the A / V signal inserted with the positional mark is transmitted to the encoder to be compressed. The A / V compression step (S30) for digitally compressing the image by a codec such as M-jpeg or Mpeg4;

A radio transmission and reception step (S40) of performing real-time compression through a modem unit 206 and transmitting it wirelessly through signal modulation through a second transmitter and receiver (301);

And a decoding step S50 of decoding the received compressed A / V signal by the decoder 303 such as Mpeg4, M-jpeg, etc. that has been wirelessly transmitted;

The restored A / V signal serves only as one signal repeater when the screen splitter 401 is turned off, but the screen splitter normally operates in step S60;

When a signal is directly input to the capture card of the vehicle computer through the above process, the license plate recognition S / W 501 separates the audio signal from the input A / V signal and decodes the position coordinates from the audio signal. A coordinate restoration step (S70) of separating the inserted coordinates;

And coordinate display step (S80) of displaying the map of the coordinates on the screen by the navigation map program of the vehicle computer through the coordinates;

 And so on.

4 is a flowchart illustrating a screen division display process;

The license plate is recognized through the above process, which is important here in order to simultaneously input two camera images transmitted for the license plate recognition, that is, the camera camera 101 and the video transmitted through the camcorder to the screen splitter at the same time. The format must match. Therefore, the compressed image must be converted to NTSC, and the two input images must be displayed by splitting the two screens into one image with the screen splitter on. The following steps are automatically activated in the above state.

An image NTSC of the vehicle camera 101 is output and simultaneously transmitted to the encoder unit in order to compress the portable camera image signal. An image compression step T10 for digitally compressing the image by a codec such as M-jpeg or Mpeg4;

    A radio transmission and reception step (T20) of performing real-time compression through the modem unit 206 of the first transmitter and transmitting it wirelessly through signal modulation and wirelessly receiving it through the second transmitter and receiver (301);

     Then, the compressed image of the first transmitter is transmitted through the modulation of the modem 206, and the second transmitter 301 is received and converted into an analog signal such as NTSC by the modem 302 modulation and decoding unit 303. When two images are simultaneously input (401), the dual image input step (T30) to the screen splitter;

The reconstructed video signal is arranged in two screens to the left and right through a color dual displayer that displays dual color camera signals on one monitor when the two images are combined into one, such as the vehicle camera 101. One image output step (T40);

  When a signal is directly input to the capture card of the vehicle computer through the above process, the license plate recognition S / W 501 performs a dual image recognition step (T50) by a real time first image algorithm among the input dual image signals;

And extracting the recognized license plate through this process and displaying the license plate on the display (T60);

 Two images are displayed as a single image, reducing excessive CPU occupancy in image recognition to speed up recognition.

5 is a flowchart illustrating a method of image recognition.

The data receiving method comprising: restoring and decoding real-time capture the image through which the video decoder by the software in such a transmitted compressed image (Q10);

Capturing a corresponding frame as a still image when there is a license plate image from the image (Q20);

Noise in the captured image is a step of removing digital image noise by an image processing algorithm from a spot and an image source (filtering step Q30);

The license plate image of the vehicle, which is the subject from the extracted and filtered still images, is formed into a rectangular license plate image and a geometric rectangle of numbers and letters in a rectangular shape. In this brightness distribution, we find the optimal brightness that best distinguishes the object from the background. Based on this, we divide the background and object into regions or boundaries of the region, extract edges, and connect the boundary lines. A boundary detection step (Q40) of extracting a form of a number through a process;

 A step of determining whether a number and a letter are recognized by comparing and determining an approximation value from a template of embedded numbers through such a boundary line;

  Determining the matching data of letters and numbers through the above process by a high matching algorithm, and classifying and storing the data converted into alphanumeric characters in the database through the recognition process (Q60);

The license plate text data such as letters and numbers obtained through all the above processes is terminated by storing the recognized text data along with the photographed image and other position coordinates in the database.

Through the invention of this technology, not only the inquiry of the vehicle, but also the real-time input of the image of the wireless camera carried by the individual on the move, and the system through the recognition of the license plate through this, further recognizing only the vehicle parked on the existing one side. It is a system that can recognize the parked vehicle of the real-time blind spots that were impossible in the vehicle with the camera of the individual portable, it is effective to recognize the part that could not be existing. And by recognizing the images of two cameras as one image, it can reduce the computer CPU occupancy and double the performance of recognition.

Claims (3)

 In the system configuration according to the present invention,    A vehicle camera installed in a vehicle; A first transceiver for compressing and transmitting a portable camcorder image; A second transceiver for receiving and decoding the compressed transmission image; A screen splitter configured to display two screens such as a vehicle camera and a wirelessly received decoded image as one; And a vehicle computer for recognizing the license plate among all the input images and displaying the received coordinate data on the picture; And license plate recognition S / W mounted on a vehicle computer for displaying and recognizing and reading the license plate; And a first transmitter / receiver. The camcorder includes: a camcorder unit for generating video and audio by hand-held; A GPS receiver for generating real-time location coordinates; A coordinate signal insertion unit for inserting a generation coordinate; And an encoder unit for compressing the inserted A / V image. A modem unit for modulating the compressed image; The second transmitter / receiver includes: a modem unit for demodulating the received image, and a decoding unit for decoding the compressed image; System configuration In claim 1 described above, In particular, the step of generating satellite coordinates of the first transmitter; And inserting coordinates of an audible frequency band; A / V compression step with guilt inserted; A wireless transmission and reception step; , Decoding step; Signal relay step; , Coordinate restoration step; Coordinate display step; System and method for transmitting and displaying the position coordinates of the first transmitter and receiver, characterized in that consisting of According to claim 1 Camcorder image compression step; Sending and receiving step; Dual image input step to the screen splitter; , Output step; dual image recognition step; , License plate display step; Dual image display system and method thereof

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