KR101639983B1

KR101639983B1 - CCTV systems inclued Quartered separate video and assistant lighting functions

Info

Publication number: KR101639983B1
Application number: KR1020160028805A
Authority: KR
Inventors: 박용준
Original assignee: (주)한빛이노텍
Priority date: 2016-03-10
Filing date: 2016-03-10
Publication date: 2016-07-22

Abstract

The present invention relates to a CCTV system, and more particularly to a CCTV system having a quadrant lighting function, which has a function of dividing an image into quarters and includes auxiliary lighting devices capable of lighting respective separated regions. The CCTV system which applies an image processing technique to successively connected frames in an image screen acquired by a CCTV camera according to the present invention performs the steps of: emitting light by using a high-power infrared LED (1) as a main light source, and detecting a movement in an image photographed by a camera (5); calculating coordinates of the detected movement in an image screen; determining a corresponding region of the image screen divided into quarters by using the calculated coordinates; operating auxiliary infrared LEDs (2 and 3) in accordance with the determined region; and recording an image after the operation of the auxiliary infrared LEDs (2 and 3). The auxiliary infrared LEDs include a mid-power LED (2) which emits light onto an upper portion of the image screen divided into quarters and enables long-distance emission having a narrow emission angle by using a lighting lens, and a low-power LED (3) which emits light onto a lower portion of the image screen divided into quarters and enables short-distance emission having a wide emission angle, thereby improving ability to identify a dynamic moving target.

Description

[0001] The present invention relates to a CCTV system having a quadrant-

The present invention relates to a CCTV system, and more particularly, to a CCTV system having a function of dividing an image into four equal parts and an auxiliary illumination device capable of illuminating separate areas, will be.

Normally, a closed circuit television (CCTV) system is used for day and night crime prevention, theft prevention, factory process monitoring, and outsider management.

As described above, the CCTV monitors and records the actual situation of the observation place and is used for monitoring the image at a long distance. In addition, in an area where nighttime illumination is low, an infrared light emitting diode (IR LED) is often used to enhance the image discrimination power.

2 is an illuminance distribution diagram according to the projected area. As shown in FIG. 2A, in the vertical plane on which the light source is vertically projected, the illuminance value is lowered radially from the center to the edge closest to the light source. This is because the illuminance along the distance from the light source is inversely proportional to the square power, such as an ordinary light source.

Usually, as shown in Fig. 1, the CCTV is usually fastened to one side of the support table 6 to photograph the ground while maintaining the tilt angle. Thus, the photographed image has a projected area of an ellipse as shown in FIG. 2B, and the illuminance values at the upper and lower ends of the image are remarkably different.

Therefore, even if the CCTV system recognizes the movement due to the variation of the illuminance of the image, it can not secure a clear image, and the discriminating power of the subject and the movement of the motion can not be distinguished from each other in the acquired image.

Korean Patent Laid-Open Publication No. 10-2013-0053170 discloses a technique for shooting high luminance light at night or at a dark place through a high-luminance LED auxiliary light source including an operation sensor and an illuminance sensor, A CCTV camera having a variable auxiliary light source capable of obtaining optimized image information at a site and a scene of a CCTV camera through a variable auxiliary light source capable of controlling the wide range has been disclosed. A technique for securing the illuminance of the upper end far from the transparent area rather than the auxiliary light source for correcting the illuminance has not been disclosed. Among the techniques described above, the light distribution width adjusting means of the auxiliary light source has a high manufacturing cost and is one of the main causes of malfunction.

In addition, a technique for storing an image in a CCTV system typically stores the entire image taken when there is dynamic motion. The purpose of using the storage technology is to store the entire CCTV image, the capacity of the storage device is physically limited, so that the storage mode can be switched to the storage mode only when there is dynamic movement, It is common to reduce the risk of malfunction caused by the operation of deletion and re-storage.

The above storage technique also stores a full screen of the image, which causes a problem of storing an unnecessary image. However, if only the region of the screen with the dynamic motion is stored in the quadrant of the photographed image, a stable storage technique for a conventional image storage technique can be secured and a long time can be saved as a clear image.

Therefore, the CCTV system of the present invention is characterized by including a light source and an image storage technology that can divide the captured image into quadrants and irradiate a zone in which the motion is perceived in the divided image as an auxiliary.

1. KR 10-2013-0053170, 'CCTV camera with variable auxiliary light source', published on: May 23, 2013. 2. KR 10-2014-0147069, 'Infrared searchlight and surveillance system using it', Published on: December 29, 2014.

An object of the present invention is to provide a CCTV system in which a main light source is illuminated by irradiating an auxiliary light source to a zone in which motion is perceived and divided into quadrants based on a photographed image, It is an object of the present invention to provide a technique for increasing discrimination power.

In order to achieve the above object, the present invention provides a CCTV system that utilizes image processing techniques to continuously frame a video image obtained from a CCTV camera, wherein the high power infrared ray (1) Detecting motion in the image photographed by the camera (5); Calculating coordinates on the detected motion image screen; Wherein the calculated coordinates are calculated by dividing the image screen into four regions; Operating the auxiliary infrared LEDs (2,3) by the calculated zone; Recording an image after the operation of the auxiliary infrared LED (2,3); Wherein the auxiliary infrared LED includes a middle output LED 2 which irradiates the upper end of the image screen divided into quadrants and has a narrow irradiation angle but is capable of far distance irradiation; And a low power LED (3) which irradiates a lower end of the image screen divided into quadrants and is capable of irradiating a wide angle of view and a near angle, thereby enhancing discrimination power of a dynamic moving object. .

The auxiliary infrared LEDs 2 and 3 of the present invention are characterized in that the medium output LED 2 has a higher output power than the low output LED 3 by 30 to 35% We want to provide CCTV system.

In addition, the step of recording an image of the present invention may include a step of storing only a video of one or more regions selected in the step of calculating the region of the video screen as a moving image file or an image file, The CCTV system having the quadrant-divided lighting function is characterized in that the image stored in the entire image is recreated in a predetermined area.

The present invention has the following effects due to the above-mentioned solution.

First, by providing the auxiliary infrared LED, it is possible to sharpen the image quality of the low-illuminance edge region.

Second, by providing auxiliary infrared LEDs having different transparent areas and different distances, it is possible to secure a homogeneous illuminance with respect to a tilted projection area.

Third, it is possible to save only the area with dynamic motion on the image screen divided into 4 equal parts, which has the effect of improving the image storage time and the reproduction technique.

Figure 1 is an embodiment of a prior art CCTV camera.
2 is an illuminance distribution diagram according to the projected area (the vertical plane A and the inclined plane B).
FIG. 3 is a diagram illustrating the distance of a camera image.
4 is an image screen divided into four equal parts.
Fig. 5 is a diagram showing a projection expectation (A) of a vision and an expectation (B) projected from the ground according to a preferred embodiment of the present invention.
6 is a front view of the infrared LED illumination device.
FIG. 7 shows an embodiment of a typical conventional CCTV storage image.
FIG. 8 shows an embodiment of a CCTV storage image storing only a selection area of the present invention.
9 is an embodiment of the selectively stored image of the present invention.
Fig. 10 shows an embodiment of the image reproduction of the present invention.

Hereinafter, a CCTV system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings of an infrared LED (IR LED) illumination device 10 and an image processing method.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, and are not intended to limit the scope or spirit of the invention. In addition, the same or corresponding components are denoted by the same reference numerals regardless of the reference numerals, and redundant description of the components will be omitted. For convenience of explanation, the size and shape of each component shown are exaggerated or reduced . Further, for the sake of simplicity of the sentence, detailed description of known technologies or components that anyone skilled in the art can understand will be omitted.

Figure 1 is an embodiment of a prior art CCTV camera.

Typically, the CCTV camera 20 is fastened to one side of the support frame 6 and photographs the setting area while maintaining a certain height from the ground.

The CCTV camera accommodates the camera module and the control unit, and has a camera module installed inside to obtain an image of the front side, and a control unit connected to the management server through wired or wireless communication means.

FIG. 3 is a view illustrating a distance of a camera image, and FIG. 4 is an image screen divided into four equal parts. The quality and quality of the camera are rapidly improved due to the rapid development of the digital image quality, so that the description of the image quality of the camera will be excluded from the present invention.

A typical CCTV photographed image will be described. Referring to FIG. 3, when the CCD type of the camera is 1/3 inch and the focus is 8 mm, the angle of view of the camera image is 40 degrees and the object distance to be projected is 10M. Under the above conditions, the camera image starts from the center of the camera at the lower end point of about 8.7 m (21), and the upper end point of the image starts from the camera, about 13 m (23) to be. However, the middle point of the camera is 8.7m (22), not 10.85m, which is the middle point between 8.7m and 13m.

As described in the above embodiment, the infrared LED illumination device 10 having the same direction at the same position as the camera has the same result as the light source. Here, the infrared LED illumination device 10 is illuminated at a distance of about 3 m from the middle 22 of the image to the lower end 21 and a far distance of 4.4 m from the upper end 23. The distance from the center of the upper and lower ends (21, 23) is 3.7 m. When the upper and lower ends of the image are separated in the vertical direction, the upper end portion from the infrared LED lighting apparatus 10 is 50% farther from the lower end portion. In particular, the illuminance is 1/4 when the distance from the light source is doubled. When it is tripled, it becomes 1/16 or 1/16 when it becomes 1/9 or 4 times.

2 is an illuminance distribution diagram along a projection plane at a certain distance from the light source. 2A is an illuminance distribution diagram for a vertical plane, and FIG. 2B is an illuminance distribution diagram for an inclined plane. 2B shows a general CCTV illuminance distribution diagram.

As shown in FIG. 1, the CCTV camera 20 is located at a certain height from the ground due to the support and captures the ground at the height. Therefore, the CCTV camera 20 has an illuminance distribution of an inclined plane as shown in FIG. 2B.

As shown in FIG. 2B, since the upper end of the center line of the image has a maximum distance from the light source, the illuminance is low and it is difficult to obtain a clear image or an image.

Therefore, in order to solve the above problems, the present invention discloses three core technologies.

First, an auxiliary light source is used. An auxiliary light source for correcting the illuminance is added to the portion where the illuminance falls on the image screen.

Second, the auxiliary light source is intended to add an upper auxiliary light source having a small irradiation angle but being capable of far-distance irradiation, and a lower auxiliary light source having a wide irradiation angle and capable of near-field irradiation.

Third, the image is divided into quadrants, and the motion is perceived by the change of illumination. The divided image area has a function of a point of intersection for driving an auxiliary light source.

The core technology will be described in more detail.

The present invention relates to a CCTV system that utilizes an image processing technique to continuously frame a video image obtained from a CCTV camera. The CCTV system includes a high power IR LED 1 as a main light source, Detecting motion in a video; Calculating coordinates on the detected motion image screen; Wherein the calculated coordinates are calculated by dividing the image screen into four regions; Operating the auxiliary infrared LEDs (2,3) by the calculated zone; Recording an image after the operation of the auxiliary infrared LED (2,3); Wherein the auxiliary infrared LED includes a middle output LED 2 which irradiates the upper end of the image screen divided into quadrants and has a narrow irradiation angle but is capable of far distance irradiation; And a low power LED (3) that irradiates a lower end of the image screen divided into quadrants and has a wide irradiation angle and is capable of short-distance irradiation, thereby enhancing the discrimination power of the dynamic moving object.

The infrared LED preferably includes at least one of a laser diode, a light emitting diode (LED), a fiber laser, and a fiber ASE source.

The step of detecting motion in the image detects motion by detecting a change in illuminance in the photographed image.

It is preferable to control the program to calculate the coordinates on the image screen and to divide the image into four equal parts based on the calculated coordinates. It is also desirable to install the CCTV and perform it at the initial setting.

As shown in FIG. 4, in the step of calculating a region on the image screen, a region in which motion is detected in an area divided into quadrants is activated, thereby becoming a start signal for operating the auxiliary light source.

4, a middle output infrared LED 2-2, a middle output infrared LED 2-1, a C zone 13, a middle output infrared LED 2-1, Output infrared ray LED 3-1 and the middle output infrared LED 3-2 in the case of the D zone 14, the discrimination power for the dynamic subject in the corresponding zone is increased.

The auxiliary infrared LEDs 2 and 3 of the present invention are characterized in that the medium output LED 2 has a higher output than the low output LED 3 by 30 to 35%.

It is preferable that the middle output LED 2 at the upper end of the output between the middle output LED 2 and the low output LED 3 be provided with an infrared LED whose output is 30% higher than that of the low output LED 3 at the lower end of the image Do.

Because the illuminance is inversely proportional to the square power of the distance from the light source, the infrared LEDs 2 and 3 attached to the square of the infrared LED due to the camera installation angle, the type of the lens, The output LED 2 should have an output of 50% or more higher than that of the small output LED 3 provided at the lower end. However, by using a high output of 30 to 35% as a parameter according to the surrounding environment and the illumination direction, It is used as a means to solve the problem that the output of the infrared LED illumination is reduced and the subject is lower in sharpness than the subject at the bottom of the image.

In particular, an infrared light source is sent in a forward direction in which the illuminating device looks in a conical shape at a vertex at which the infrared light source output from the infrared illuminating device starts. In such a conical front display, the infrared light source transmits a high infrared light source to the central portion of the conical shape, and the output of the infrared light source decreases as the cone spreads outward. Under the above conditions, the camera captures a rectangular image. A device provided for supplying an additional infrared light source to a region where the infrared light source is short and is not distinguishable from an object or a moving object due to lack of an infrared light source in a region of a vertex direction of the rectangular image of the camera, And outputs an additional infrared light source in the direction of the vertex of the infrared light source.

It is preferable that the auxiliary infrared ray LED corresponding to the detected area of motion is operated separately. In order to solve this problem, in order to solve this problem, it is necessary to adjust the brightness, saturation, and white balance of the camera in order to solve the problem of the camera in which the object is too bright due to the characteristics of the camera, Function is provided. This is a unique function of CCTV camera that increases the white color representation by function of white balance when receiving too high luminous flux due to the image correction function and raises the expression of white color when it is too dark.

When the brightness of the surroundings is high or a high brightness is transmitted from the infrared illumination device by the function of the CCTV camera as described above, the darkness and white balance function of the bright image are automatically operated to increase the discrimination power. It does not. For example, while the contrast of a CCTV camera is described, it should be noted that the conditions and values presented in the performance and specifications of the camera may be different, and the image of the CCTV camera receiving the infrared light source is converted to gray scale, And black to indicate the lightness difference in a gradual step range. It is used as a tone reference reference for designers as well as for checking video systems and is used to check and evaluate reflections of all screens and materials used in the studio.

Typically, the gray scale has 10 levels of brightness, including at least 3% reflections up to 60% reflections, 3% specifying a value of 0, 60% specifying 255, 256 steps from 0 to 255 Of the lightness of the light.

The reaction of the infrared light source with respect to the CCTV camera recognizes a high light source exceeding 95 on the basis of 45 to 95 in general and an appropriate value of less than 95. When a light source lower than 45 is provided, Is provided.

For the above reasons, the middle and low power infrared LEDs 2 and 3 are moved in order to provide a light source close to 95 under the condition that the low power infrared LEDs 2 and 3 are not turned on at the same time, Providing a light source according to the area.

5 is a projection view (A) of the vision and an expected view (B) projected from the ground as one preferred embodiment of the present invention, and Fig. 6 is a front view of the infrared LED illumination device.

The auxiliary infrared LED of the present invention includes a middle output LED 2 which irradiates the upper end of the image screen divided into quadrants and irradiates a far distance but has a narrow irradiation angle; And a low power LED (3) which irradiates the lower end of the image screen divided into the quadrants and has a wide irradiation angle and is capable of irradiating a short distance.

Accordingly, referring to FIG. 2B, when capturing an image with a CCTV camera, the upper part of the image screen often has low luminosity and thus can not identify a moving subject. Therefore, in order to correct the illuminance of the upper end portion of the image, it is desirable to provide an auxiliary light source of the medium output LED 2 that has a small irradiation angle but is far away from the light source.

In addition, it is preferable that one or more low-power LEDs 3 that irradiate the lower end of the image screen and are capable of irradiating a wide range of light at a short distance are provided.

It is preferable that the illumination angle of the auxiliary IR LED is adjusted by an illumination lens or an aspheric surface illumination lens provided in front of the auxiliary IR LED. This is because the manufacturing cost is inexpensive, durability and maintenance are more advantageous than in the case of including the irradiation angle adjusting device and the length adjusting device.

In video storage technology in CCTV systems, a technique for storing only dynamic motion is common. That is, the purpose of using video storage technology in CCTV is to limit the storage capacity of the storage device when the CCTV video is completely stored. Therefore, it is necessary to overwrite the front part of the stored video or to delete the stored video, There is a case in which the image can not be stored because it is secured or the capacity is exceeded.

The present invention provides a method for securing a storage space of a storage device in order to solve the above problems.

The present invention relates to a method of detecting a motion of an image captured by a camera (5) by irradiating a high power infrared ray (1) with a main light source, Calculating coordinates on the detected motion image screen; Wherein the calculated coordinates are calculated by dividing the image screen into four regions; Operating the auxiliary infrared LEDs (2,3) by the calculated zone; Recording an image after the operation of the auxiliary infrared LED (2,3); .

The step of recording the image after the operation of the auxiliary infrared LEDs 2 and 3 includes the step of storing only the image of one or more regions selected in the step of calculating the region of the image screen as a moving image file or an image file .

FIG. 7 shows an example of a typical conventional CCTV storage image. A typical CCTV storage image stores an entire image screen input by a camera, but the present invention stores a partial image.

In the present invention, only the region having the dynamic motion is recorded, the region outside the region is edited with the black image, and the edited image is edited and saved as black in the image as shown in FIG.

Generally, black image in a video image directly affects the size of a video image in the sense that there is no image. The size of the DATA area of the image in the structure of the image can be reduced by about 1/4.

9, the partial image is stored as an image file to increase the physical storage capacity, and only the image portion having a size of 1/4 of the image screen is stored. Therefore, Saving up to 75%, and even 4 times as much storage as the same time.

According to the present invention, it may be difficult to grasp the overall motion by reproducing the video stored in the partial video image (FIG. 8). Therefore, not only a selection area with dynamic motion but also a whole image screen may be required. Therefore, it should be restored to normal image.

According to the present invention, a moving image (FIG. 8) in which only the moving area is stored when the moving image is moving is a new image that the entire image is accepted at the time of the first operation of the camera or the first operation due to power- 7, the motion image is detected as the first motion image, and the motion is detected by comparing the motion image with the image coming in the next frame based on the image. Therefore, As shown in Fig. 8, the image stores the moving image. In this reproduction method, an image of a frame containing the entire image is output. In the next image, a moving image is displayed as in the image of FIG. 8, and the partial image is overwritten with the entire image of the previous frame As shown in FIG. 8, if a moving picture in the selected area is overwritten, a new moving picture is reproduced.

More specifically, as shown in FIG. 10, a partial image 52 to be reproduced in the next frame is reproduced by covering only the corresponding portion in the state where the image 51 exists, whether it is from the beginning. The image 51 is processed into the background as a motionless region and the same image is obtained while the partial image 52 is being overwritten so that one normal image can be restored.

That is, the image 51 from the beginning becomes the background, and the partial image 52 in which the dynamic motion is detected is reproduced in the selected region, so that the overall motion can be grasped easily.

1: High power infrared LED, 2: Medium power infrared LED.
3: low-power infrared LED, 5: camera,
6: Support, 10: Infrared LED (IR LED)
11: Zone A divided into quadrants, 12: Zone B divided into quadrants
13: Zone C divided into quadrants, 14: Zone D divided into quadrants
20: CCTV camera,
21: the lowest point of the image screen, 22: the middle point of the image screen.
23: uppermost point of the image screen,
51: first image, 52: partial image

Claims

In a CCTV system that utilizes image processing techniques to continuously frame a video image obtained from a CCTV camera,
Irradiating the high power infrared ray LED (1) with a main light source to detect motion in the image photographed by the camera (5);
Calculating coordinates on the detected motion image screen;
Wherein the calculated coordinates are calculated by dividing the image screen into four regions;
Operating the auxiliary infrared LEDs (2,3) by the calculated zone;
Recording an image after the operation of the auxiliary infrared LED (2,3); , &Lt; / RTI &
The auxiliary infrared LED may include:
A middle output LED 2 which illuminates the upper end of the image screen divided by the quadrants and uses an illumination lens to illuminate far away but with a small irradiation angle;
And a low power LED (3) which illuminates the lower end of the image screen divided into quadrants and is capable of irradiating with a wide angle and a close range using an illumination lens,
The auxiliary infrared LEDs (2, 3)
Wherein the medium output LED (2) has an output as high as 30 to 35% higher than that of the low output LED (3).

The method according to claim 1,
After the operation of the auxiliary infrared LEDs 2 and 3,
And storing only the image of one or more regions selected in the step of calculating the region of the image screen as a moving image file or an image file.

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