KR101322830B1 - Closed circuit television system using weather information - Google Patents

Abstract

PURPOSE: A video storage closed circuit television (CCTV) system capable of improving a recognition rate by reflecting weather information is provided to suppress the storage of an unnecessary image by setting up the storage of an image photographed by a camera according to whether change. CONSTITUTION: A control device (200) comprises a moving picture collecting module, a screen change rate analysis module, and an image file creation module. The moving picture collecting module collects moving picture data. The screen change rate analysis module analyzes the moving picture data which is collected by the moving picture collecting module. The screen change rate analysis module extracts an image in which change of a screen is generated according to a set screen change rate. The image file creation module produces an image file with the image extracted by the screen change rate analysis module. A threshold correcting device (300) corrects a threshold of the screen change rate by being connected to whether information.

Description

CCTV system for video storage that can improve recognition rate by reflecting weather information {CLOSED CIRCUIT TELEVISION SYSTEM USING WEATHER INFORMATION}

The present invention relates to a CCTV system for image storage that can improve the recognition rate by reflecting weather information, and more particularly, unnecessary image is stored by adjusting the screen change rate reflecting the weather information, which provides a standard for generating an image file. It is about a CCTV system that prevents it.

Various cameras are installed on the road. From the most common speeding cameras to traffic signal cameras at intersections, mobile cameras, no-parking cameras, bus-only lane cameras, and variable lane violation surveillance cameras in some areas It is a flood era of CCTV such as security cameras.

In general, the speeding camera is composed of a still image camera for cracking down on a speeding vehicle only. The surveillance camera and the traffic measuring camera for monitoring vehicle traffic on each section are composed of video recording cameras. Cameras for collecting toll charges or real-time monitoring of parking lots, roads, and shops for the method consist of Closed-Circuit Television (CCTV).

2. Description of the Related Art Recently, surveillance cameras for recording and storing vehicles and road conditions that pass through a road have been increasing. Instead of merely storing images, a vehicle license plate is recognized from a photographed image, And a variety of technologies related to the storage and retrieval system of the license plate recognition image for retrieving the recognized license plate using such a system are known.

Such a conventional license plate recognition and retrieval system is a camera for photographing a passing vehicle as a moving image to a frame acquirer, and a frame grabber for dividing the moving image transmitted by the camera in units of still images. ), And an image codec for transmitting each still image received from the frame acquirer to a number recognition module and a storage device, and a still image taken from the vehicle license plate among the still images received from the image codec to obtain a vehicle number. A license plate recognition module, a storage device for storing the recognition result of each license plate and each still picture together, and a retrieval device for retrieving a still picture on which a specific license plate is photographed from the storage device are included.

The vehicle license plate recognition and retrieval system can automatically manage the recognition image of the vehicle license plate by automatically recognizing and storing the vehicle number through the still image photographed on the vehicle license plate, and based on the stored still image and the vehicle number The license plate of the vehicle can search for still images taken.

1 is a flowchart illustrating a method of recognizing a conventional license plate.

First, a traffic vehicle is photographed through a camera and acquired in the form of a video (S100).

The obtained video is separated into respective still pictures through a frame grabber, and each of the separated still pictures is transmitted to the storage device and the number recognition module through the video codec (S200).

Subsequently, the license plate recognition operation is performed through image analysis of the number recognition module among the still images in which the license plate is recorded, and the license plate recognition result is stored in the storage device (S300). At this time, the recognition method of the license plate of the vehicle is disclosed in Republic of Korea Patent No. 10-0703956. The disclosed technique is a technology for recognizing a license plate after extraction by dividing the license plate image into a license plate area and a character area using a change of color or an inversion technique for contour.

However, if the license plate is not recognized, or only a part of the license plate is recorded or the recognition of the license plate fails due to light remaining in the image, the result is deleted in the number recognition (S400).

However, the above-described method of recognizing a vehicle license plate has a problem in that a large capacity storage means is required to store all of the moving images because the information of the traffic vehicle is obtained in the form of a moving image, and therefore, a huge construction cost is initially required.

Accordingly, in recent years, a technique of continuously analyzing a video taken by a camera and storing a corresponding video only when a change occurs in a screen is being studied.

However, a method of storing a corresponding image only when a change occurs in a screen may cause a phenomenon in which a photographed image is stored even when an animal such as a dog or a cat passes through the surveillance region of the camera.

Furthermore, when snow or rain falls, a certain change occurs on the screen, which may be recognized as a monitored object such as a person or a vehicle, and unnecessary images may be stored. Even when a vehicle passes, the amount of change of the screen caused by the vehicle is snowed. The image of the vehicle may not be stored because it is relatively hostile by the rain or rain.

That is, even if the factor causing the change of the screen is not a person or a vehicle, the captured image may be stored, and even if the factor is a person or a vehicle, the captured image may not be stored.

Republic of Korea Patent Registration No. 10-0968433 (2010.07.08 announcement) Republic of Korea Patent No. 10-1146581 (June 14, 2012) Republic of Korea Patent No. 10-0722966 (announced 30 May 2007)

Accordingly, an object of the present invention is to provide a CCTV system that can be set to the storage of the image taken by the camera in accordance with the weather changes to inhibit the storage of unnecessary images, and to lower the false recognition rate of objects entering the surveillance area. .

In order to achieve the above object of the present invention, in an embodiment of the present invention, a digital camera that captures a surveillance area to generate video data, and is connected to the digital camera to collect video data, and analyzes the video data CCTV system including a control device for generating an image file from the image of the screen change occurs according to the set screen change rate, and a threshold correction device connected to the control device, the threshold correction device for interlocking with the weather information to correct the threshold of the screen change rate To provide.

By using the CCTV system according to the present invention, the camera can be installed at a place where it is necessary to monitor the intrusion of a person, the movement of a person, or the vehicle number of the entering vehicle. Since the image is stored and recorded only when a change occurs in the image of each camera, a relatively low construction cost is required. In other words, without storing a video file captured by monitoring the surveillance region in real time, the video is stored only when a change occurs in the video, and thus a large storage means is not required.

Furthermore, the present invention analyzes the screen change rate generated in the surveillance area due to weather such as snow or rain, and thus the storage and extraction of the image data for the surveillance area is not generated at the corresponding screen change rate. This is minimized.

In addition, the present invention can store the image file only when the monitored area passes through the surveillance area, such as a person and a car, thereby preventing unnecessary storage of the screen, and can increase the recognition rate of the vehicle license plate and recognize the face of the person. Increase the recognition rate for.

In addition, the present invention can provide stable performance for face recognition, detection of a vehicle, and number recognition of a vehicle even in bad weather conditions.

Furthermore, the present invention can store the image data collected in each surveillance area in the management server. In addition, by storing the location information and time information with the stored image data, it is easy to search the recorded file by the time unit or date unit, and extract only the necessary portion to be used as evidence in the police or prosecution later.

1 is a flowchart illustrating a method of recognizing a conventional license plate.
2 is a block diagram illustrating a CCTV system according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the CCTV system for image storage (hereinafter referred to as 'CCTV system') that can improve the recognition rate by reflecting weather information according to the preferred embodiments of the present invention.

2 is a block diagram illustrating a CCTV system according to the present invention.

Referring to FIG. 2, the CCTV system according to the present invention analyzes a digital camera 100 generating a video data by capturing a surveillance area, and analyzes the video data collected from the digital camera 100. A control device 200 for generating an image file from an image, and a threshold correction device 300 for controlling the control device 200 in association with weather information, and optionally, the control device 200 and a wired / wireless communication network. The connection server may further include a management server (not shown) for receiving and storing the image file.

Hereinafter, each component will be described in more detail with reference to the drawings.

CCTV system according to the present invention includes a digital camera (100).

The digital camera 100 generates video data by continuously photographing a predetermined surveillance area, and any digital camera may be used as long as it can achieve this purpose.

For example, the digital camera 100 photographs a predetermined surveillance area to check whether a target object, such as a person or a vehicle, is entered, and if the target object is found in the surveillance area, a CCD that tracks and photographs the location of the found target object. Cameras can be used.

CCTV system according to the present invention includes a control device (200).

The control device 200 is connected to the digital camera 100 to collect the video data generated by the digital camera 100, by analyzing the video data from the image of the screen change occurs according to the set screen change rate Create an image file.

The control device 200 may be configured to store a self-generated image file (or video file) and transmit the image file to a management server connected through a wired or wireless communication network. To this end, the control device 200 is configured to have a storage means for storing the image file, or is connected to a separate storage means for storing the image file.

More specifically, the control device 200 is connected to the digital camera 100, the video collection module for collecting video data, the screen change rate analysis module for analyzing the video data collected by the video collection module, and the screen The image file generation module may generate an image file using the image extracted by the change rate analysis module.

The screen change rate analysis module compares and analyzes the luminance signal (Y: Luminance) and the color difference signal (C: Chrominance) in each frame of the video data received from the video collection module. Calculate the amount of change. The screen change rate is extracted from the change amounts of the luminance signal and the color difference signal calculated in this way.

Such a screen change rate is an important factor for detecting the motion of the monitored object in each frame by comparing the size with a predetermined reference image change rate.

As an embodiment, when the control apparatus 200 according to the present invention has previously designated the reference image change rate as 20%, if the screen change rate read by the screen change rate analysis module has a value of 20% or more, the monitored object In this case, the screen change rate analysis module requests an image file generation module to generate an image file of the motion detection image.

The change rate of the reference image may be pre-adjusted according to cognitive precision in some cases, in order to reduce the cognitive error rate of the motion detection image.

When the image received from the screen change rate analysis module is recognized as the motion detection image of the monitored object, the image file generation unit generates an image file for the motion detection image and stores the image file or transmits the image file to the management server through a wired / wireless communication network. send.

If necessary, the control device 200 according to the present invention may be configured to extract the vehicle number from the image file. For example, the control apparatus 200 separates the moving image data transmitted by the digital camera 100 through each frame obtainer into respective still image units, and converts each still image received from the frame acquirer into a number recognition module. The vehicle identification plate recognizes the vehicle number by analyzing the still image photographed by the license plate of each still image through the number recognition module. To this end, the control device 200 is built-in frame acquirer and number recognition module, or is connected to the frame acquirer and number recognition module separately installed.

As such, the control apparatus 200 reads the moving image data photographed by the digital camera 100 to confirm the person or vehicle entering the surveillance area, and generates an image file from the moving image data according to the result to be confirmed, and the image file It reads and recognizes the vehicle number or performs a person's facial recognition. At this time, when the vehicle number information is generated as a result of the recognition of the image file, the control device 200 transmits the vehicle number information together with the image file to the management server or stores it in the storage means.

On the other hand, the management server is connected to the control device 200 through a wired or wireless communication network, and receives and stores the image file transmitted from the control device 200. In this case, when face recognition information or vehicle number information of the person is not received together with the image file, the management server operates to read the image file to recognize the face or the vehicle number of the person.

In addition, the management server may analyze the image file and transmit a control signal to the digital camera 100 that generated the image file. More specifically, the management server reads the image file to the control device 200 that transmits the image file if it is analyzed that the snow or rain in the area where the digital camera 100 is installed, or the sunlight is blocked by the cloud. The control signal of the digital camera 100 is transmitted. In this case, the control signal of the digital camera 100 is an exposure compensation signal for correcting exposure to sunlight of the digital camera 100.

CCTV system according to the present invention may further include an LED light (not shown).

The LED light is to emit light to the surveillance area when the illumination of the surveillance area of the digital camera 100 is lowered, for this purpose is installed in the vicinity of the digital camera 100.

These LED lights can be used with any LED light that can increase the illumination of the surveillance area, and may specifically use an infrared LED.

CCTV system according to the present invention includes a threshold correction device (300).

The threshold correction device 300 is connected to the control device 200, and linked to the weather information so that the image file generated by the control device 200 is limited according to the weather information of the region where the digital camera 100 is installed. The threshold value of the screen change rate set in the control device 200 is corrected.

Here, the correction of the threshold value means that the screen change rate is increased by increasing the screen change rate, for example, 10 to 20%, which is set in the control device 200, for example, 15 to 30%.

If the threshold is less than 10%, it is difficult to expect the effect of filtering out unnecessary images. On the contrary, if it exceeds 20%, the change rate criterion becomes high, which causes a problem of not capturing the actual movement of the monitored object.

For example, if the screen change rate set in the control device 200 is 20%, and it is analyzed that the rain falls on the monitoring area of the digital camera 100 by the weather information, and the threshold of the screen change rate is set to 10 to 12%, As a result, the threshold correction device 300 corrects the set screen change rate of the control device 200 to be 22 to 24%.

When the threshold correction device 300 is used, the control device 200 inhibits recognition of snow or rain movement as a vehicle, thereby preventing unnecessary image files from being generated.

More specifically, the threshold correction device 300 is an external server such as a meteorological office, the weather information DB is built through the communication module 310, the communication module 310 is connected to the wired and wireless communication network as shown in FIG. Connected to the weather information collection module 320 for collecting the weather of the setting region in real time from the weather information DB, the screen change rate set in the control device 200 according to the weather information collected from the weather information collection module 320 Comprised of a change rate correction module 330 to correct.

Since the threshold correction device 300 may reflect the weather information in advance on the screen change rate, which is a standard for generating an image file, even when the screen of the image is changed due to snow, rain, hail, etc., the unnecessary image file by the control device 200. This can be prevented from being generated. In addition, the screen change rate due to the monitored object (person, vehicle, etc.) entering the surveillance area due to snow, rain, hail, etc. is relatively less recognized, thereby providing a function of preventing the generation of an image file for the monitored object. .

The communication module 310 transmits the vehicle number recognized by the control device 200, the image of which the vehicle number is taken, and its associated data (date, time, place, etc.) to a remote management server, and from the management server. It receives a control signal of the digital camera 100. Therefore, images captured by the digital cameras 100 may be read by the control apparatus 200 in real time, and necessary images among the read images may be transmitted to the remote management server through the communication module 310. At this time, the communication module 310 is configured to enable the transmission and reception of data in a wireless manner using wired and GSM, CDMA, WCDMA, CDMA2000, LTE, LTE-Advanced using general communication and power line communication.

As described above, the present invention reduces the cost of constructing a CCTV system compared to the case of using a weather sensor by using an external server 10 instead of detecting a weather situation in which rain or snow or hail falls using a weather sensor. It is possible to prevent unnecessary image files from being generated due to malfunction.

The threshold correction device 300 provides a light of the LED light to the surveillance area when it is difficult to clearly recognize the monitored object that enters the surveillance area of the digital camera 100. Appearance and vehicle number can be easily recognized.

To this end, the threshold correction device 300 may be configured to include an LED control module for controlling the on-off of the LED light. At this time, the LED control module is connected to the weather information collection module and the LED light to control the LED light according to the weather information collected by the weather information collection module.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that it is possible.

100: digital camera 200: controller
300: threshold correction device 310: communication module
320: weather information collection module 330: change rate correction module

Claims (5)

A digital camera that captures a surveillance area and generates video data;
A video collection module connected to the digital camera to collect video data, a screen change rate analysis module to analyze the video data collected by the video collection module, and to extract an image having a change in screen according to a set screen change rate; A control device configured to generate an image file with an image extracted by the screen change rate analysis module; And
CCTV system comprising a threshold correction device connected to the control device, the threshold correction device for interlocking with the weather information to correct the threshold of the screen change rate. The CCTV system according to claim 1, wherein the screen change rate set in the control device is 15 to 30%. The apparatus of claim 1, wherein the threshold correction device
CCTV system, characterized in that configured to increase the threshold value of the screen change rate set in the control device 10 to 20% when it is analyzed that snow and rain falls on the surveillance area by the weather information. The method of claim 1,
The control device is configured to transmit the image file to the outside via a wired or wireless communication network,
CCTV system, characterized in that it further comprises a management server for receiving and storing the image file transmitted from the control device. The apparatus of claim 1, wherein the threshold correction device
A weather module for connecting a wired / wireless communication network, a weather information collection module connected to an external server having a built-in weather information DB through the communication module to collect weather information of a set area in real time from the weather information DB, and the weather information CCTV system, characterized in that consisting of a change rate correction module for correcting the screen change rate set in the control device according to the weather information collected from the collection module.

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