KR20140065109A - Automatic reflex revision device and method of digital video recorder system - Google Patents

Abstract

The present invention relates to a device for improving an image quality in real time. In particular, a device for automatically compensating an image of a security system comprises: an image compensation unit for inputting a digital signal outputted from an ADC according to a control signal to improve an image quality through the processes of improving an image, removing a noise and removing fog, etc., adjusting the correction degree by corresponding image quality control parameters predetermined in multiple modes to the modes and providing a DAC with the adjusted correction degree; an operation mode selection unit for outputting a selection signal to select, by a user, the correction degree of the image quality improved by the image compensation unit; and a control unit for inputting the selection signal outputted from the operation mode selection unit and controlling the ADC, DAC and the image compensation unit. According to the system and the method of the present invention, the quality of the image transmitted from a CCTV can be improved by adding the device of the present invention to an output end, etc. of the existing CCTV without replacing the CCTV camera with a CCTV camera having high specifications. Furthermore, by considering that the clearness of the monitored image can be inconsistently determined by people due to differences in personal tastes, vision status or color detection abilities, the device and the method allows a manager to select and operate the compensation degree according to the image quality status of a screen monitored by the manager so that the manager can select the image that the manager thinks as a clear image. Therefore, the reliability of the image compensation device can be improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic image correction apparatus for a security system,

The present invention relates to an apparatus for improving image quality in real time, and more particularly, to an apparatus and method for improving image quality of a video enhancer, which is an apparatus for improving image quality such as closed-circuit television (CCTV) The present invention relates to an automatic image correction apparatus for a security system and a method for operating the automatic image correction apparatus.

In general, a closed circuit surveillance system combining a CCTV and a closed-circuit monitor such as a CCD (Charge Coupled Device) camera is used to monitor or monitor the space of a specific area.

In general, closed-circuit cameras (CCTV) are used in the same building or at relatively short distances. They are mainly used for monitoring specific places and for shooting places that are difficult for people to directly watch.

In other words, a remote controllable camera is installed in a place where people are directly residing, such as an outer edge of a building, an underground parking lot, a road, etc., and a monitor screen provided in a remote control room Monitoring system.

Such a conventional system has a problem that the photographed image is not clear when the weather is foggy or fog occurs, and the situation of the road can not be grasped properly. In addition, even if the surface of the camera is covered with a foreign object such as dust, contaminants such as smoke, raindrops, eyes, etc., the image quality of the image is deteriorated.

In addition, in the case of the Republic of Korea, especially in the situation where the CCTV video environment is poor, there is a lot of smog phenomenon in the city center and around the city center where the demand for CCTV is high and the visibility is not very good due to the yellow dust nationwide, There is a great need to improve the image quality of the image.

Therefore, high-resolution products with higher specifications are required. Applying these high-resolution products to all CCTVs is costly and problematic.

Therefore, as a recent technology proposed to overcome the above-described problems, a method of improving image quality of an image is sought instead of using a high-resolution product. Such a device is called a video enhancer.

The video enhancer described above is a device that optimizes an image such as a CCTV to sharpen an invisible part due to blurring or darkness, and performs a function through a digital algorithm to a part that can not be performed by a conventional lens or a sensor .

Since the existing video enhancer has been simplified to a mode for controlling the image quality automatic compensation mode and the compensation operation on / off, the administrator can not be satisfied with the image quality of the surveillance screen displayed on the monitor There is a problem in that adjustment is impossible.

An object of the present invention to overcome the above problems is to provide an apparatus for improving image quality in real time, and more particularly to an apparatus for improving the image quality of a video enhancer, And to enable an administrator to select and operate a compensation level according to the picture quality state of a screen monitored by the manager, and to provide an operation method of the automatic image correction apparatus of the security system.

According to another aspect of the present invention, there is provided an automatic image correction apparatus for a security system, comprising: an ADC for converting an incoming analog video signal into a digital signal and outputting the digital signal; A DAC converting an input digital video signal into an analog signal and outputting the analog signal; The image quality is improved by performing image enhancement, noise reduction, and fog removal by receiving a digital signal output from the ADC according to a control signal. To the DAC side; An operation mode selection unit for outputting a selection signal for a user to select a degree of compensation of an image to be improved through the image compensation unit; And a control unit receiving the selection signal output from the operation mode selection unit and controlling the ADC, the DAC, and the image compensation unit.

According to another aspect of the present invention, there is provided an automatic image correction apparatus for a security system, comprising: an operation mode selection unit for automatically adjusting an image quality of the image compensation unit to an optimized compensation value; A mode selection unit; And a compensation degree selecting unit for additionally improving the image quality state automatically compensated for; The compensation level selection unit is configured to be able to select a differential compensation of three levels (L, M, H).

According to another aspect of the present invention, there is provided an automatic image correction apparatus for a security system, comprising: an automatic compensation mode selection unit and a compensation level selection unit of the operation mode selection unit, .

According to still another aspect of the present invention, there is provided an automatic image correction apparatus for a security system, including an image correction unit for generating an image including fog removal, noise reduction, dynamic range change, edge emphasis, Perform improvement work; And the image quality improvement control parameter set in the multi-mode through the automatic compensation mode selection unit and the compensation level selection unit of the operation mode selection unit is associated with each mode to adjust the degree of compensation.

According to another aspect of the present invention, there is provided a method of operating an automatic image correction device in a security system, the method comprising: receiving a digital signal output from an ADC according to a control signal; An image compensator for adjusting image quality improvement control variables previously set in a multi-mode to correspond to each mode and adjusting the degree of compensation to provide the image quality improvement control variable to the DAC; An automatic compensation mode selection unit for automatically compensating the image quality improvement level of the image compensation unit to an optimized compensation value and a compensation degree selection unit for additionally further improving the automatically compensated image quality level, And a control unit for receiving the selection signal output from the operation mode selection unit and controlling the ADC, the DAC, and the image compensation unit, A method of operating an automatic image correction apparatus comprising: a first step of receiving an image photographed by a CCTV at a power-on time; A second step of determining whether the automatic compensation mode selection unit of the operation mode selection unit is in the ON operation state when an image photographed by the CCTV is supplied to the image compensation unit through the first step; A third step of improving the image quality of the image compensating unit by using a reference variable for image quality compensation (improvement) which is usually optimized when the automatic compensation mode selecting unit is judged to be in the ON operation state in the second step; A fourth step of determining whether the compensation degree selection unit of the operation mode selection unit is in an ON operation state; A fifth step of determining whether the compensation degree selection unit has selected one of the differential compensation of three predetermined levels (L, M, H) when it is determined that the compensation degree selection unit is in the ON state in the fourth step; And a sixth step of performing an additional compensation on the basis of the image compensated in the third step according to the additional compensation mode 3 (L, M, H) determined in the process of the fifth step have.

According to the present invention, it is possible to improve the image quality of a video image transmitted from the CCTV by adding the apparatus of the present invention to the output terminal of a conventional CCTV, without changing the CCTV camera to a high- According to the picture quality state of the screen monitored by the administrator, the administrator can select and operate the compensation level.

This is because human beings can select an image that the manager feels vivid because the human being has a distinct feeling of sharpness with respect to the monitored image due to differences in personal preference, visual acuity state or color sensing ability, .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a configuration of an automatic image correction apparatus of a security system according to the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
3 is a flowchart illustrating an operation of the automatic image correction apparatus of the security system according to the present invention.

Hereinafter, an automatic image correction apparatus of a security system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of an automatic image correction apparatus according to an embodiment of the present invention; FIG. 2 is a block diagram of an automatic image correction apparatus according to an exemplary embodiment of the present invention; FIG. 3 is a flowchart illustrating an operation of the automatic image correction apparatus of the security system according to the present invention.

1, the automatic image correction apparatus 100 of the security system according to the present invention includes an ADC 110 for converting an incoming analog video signal into a digital signal and outputting the digital signal, A DAC 120 for converting an analog signal into an analog signal, and a digital signal output from the ADC 110 according to a control signal to improve image quality through image enhancement, noise removal, and fog removal, An image compensating unit 130 for adjusting a compensation value of the image quality improvement control unit in correspondence with each mode and providing the compensated degree to the DAC 120 side and an image compensating unit 130 for compensating the degree of compensation of the image to be improved through the image compensating unit 130 An operation mode selection unit 170 for outputting a selection signal to be selected by the user and a selection signal output from the operation mode selection unit 170, A control unit 180 for controlling the video compensator 130. The

The operation mode selection unit 170 may include an automatic compensation mode selection unit 171 for automatically compensating the image quality improvement level of the image compensation unit 130 to an optimized compensation value, And a compensation degree selection unit 172 for further improving the compensation degree selection unit 172. [ The compensation degree selection unit 172 is configured to be able to select differential compensation of three levels (L, M, H), and additionally, the automatic compensation mode selection unit 171 of the operation mode selection unit 170 The compensation level selection unit 172 has a push button to have an on / off function.

Therefore, the image compensating unit 130 receives a signal obtained by converting the image photographed by the CCTV into a digital signal by the ADC 110, and receives the signal for improving the image quality such as fog removal, noise removal, dynamic range change, edge emphasis, And adjusts the degree of compensation by associating the image quality improvement control parameter previously set in the multi-mode through the automatic compensation mode selection unit 171 and the compensation level selection unit 172 of the operation mode selection unit to each mode.

Thereafter, the analog signal is converted into an analog signal by the DAC 120 and then output.

Accordingly, as shown in FIG. 1 or FIG. 3, it can be seen that the image before the image quality improvement and the image after the image quality improvement are significantly different from each other.

The operation concept of the image enhancement process of the image compensator 130 of the above-described configuration is as shown in FIG. 2, which receives the pre-enhancement image, clarifies the difference between the respective brightness levels through brightness correction, By making the difference clear, it improves the image. The random noise existing even after such image enhancement has a great influence on the image quality. The image compensating unit 130 according to the present invention performs the noise removing operation after the image enhancement.

Reference numeral 140 denotes a memory for storing various kinds of data for automatic image correction and temporary information and data necessary for the operation of the controller 180. Reference numeral 150 denotes an operating state And 160 is a power supply for supplying driving power.

Here, the enlarged portion of FIG. 1 exemplifies a case where the operation mode selection unit 170 is implemented in an actual panel, but the present invention is not limited thereto.

Referring to FIG. 1 attached with reference to FIG. 3, an operation of the automatic image correction apparatus 100 of the security system according to the present invention, and an example of image compensation according to the operation,

At the time when the power is turned on, the control unit 180 controls the ADC 110 to receive the image photographed by the CCTV, and supplies the digital image signal to the image compensating unit 130 (step S101).

In step S101, while the image captured by the CCTV is supplied to the image compensating unit 130, the controller 180 determines whether the automatic compensation mode selection of the operation mode selecting unit 170 And reads whether the unit 171 is in the ON operation state.

If it is determined in step S102 that the automatic compensation mode selection unit 171 is in the off operation state, the controller 180 proceeds to step S103 so that the input image is directly output without improving the image quality. 130 and the DAC 120, respectively.

Therefore, even if the image contains fog or noise, the image is output as it is.

On the other hand, if it is determined in step S102 that the automatic compensation mode selection unit 171 is in the ON state, the control unit 180 proceeds to step S104 to set a reference variable The image compensating unit 130 may improve the image quality.

Thereafter, the controller 180 reads in step S 105 whether the compensation level selection unit 172 of the operation mode selection unit 170 is in the on-state.

If it is determined in step S105 that the compensation level selection unit 172 is in the off-state, the flow advances to step S106 to output a standard image-enhanced video.

Comparing the < input image > and < automatic compensation image > shown in Fig. 3, it can be seen that a very clean image with no fog is obtained.

At this time, a person may generally feel that the &quot; automatic compensation image &quot; displayed through the process of step S106 is not clear due to a difference in personal taste, visual acuity state, or color sensing capability.

The reason for this is that the sensation felt visually is different for each person, so that the image compensating apparatus according to the present invention is intended to have an effect of enhancing the reliability of the image compensating apparatus by allowing an administrator to select an image which is clear.

Therefore, if it is determined in step S105 that the compensation level selection unit 172 is in the on-state, the process proceeds to step S107, where the compensation level selection unit 172 determines whether the compensation level selection unit 172 is in the ON- And the differential compensation of &lt; RTI ID = 0.0 &gt;

At this time, according to the additional compensation mode 3 (L, M, H) selected in the process of step S107, an additional compensation is performed based on the image automatically compensated in the process of step S104. As shown in steps S108, S109, and S110.

Therefore, when comparing the <selected L mode compensation image>, the <selected M mode compensation image> and the <selected H mode compensation image> among the compensation images shown in FIG. 3, will be.

Accordingly, since the manager can select the sharpest image he / she feels, the reliability of the automatic image correction apparatus 100 is reduced due to the individual preference, and at the same time, when there are a plurality of managers monitoring the CCTV, It is possible to provide an image according to the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

100: Automatic image correction device
110: ADC
120: DAC
130:
170: Operation mode selection unit
180:

Claims (5)

An ADC for converting an incoming analog video signal into a digital signal and outputting the digital signal;
A DAC converting an input digital video signal into an analog signal and outputting the analog signal;
The image quality is improved by performing image enhancement, noise reduction, and fog removal by receiving a digital signal output from the ADC according to a control signal. To the DAC side;
An operation mode selection unit for outputting a selection signal for a user to select a degree of compensation of an image to be improved through the image compensation unit; And
And a controller for receiving the selection signal output from the operation mode selection unit and controlling the ADC, the DAC, and the image compensation unit. The method according to claim 1,
The operation mode selection unit may include an automatic compensation mode selection unit that automatically compensates the image quality improvement level of the image compensation unit to an optimized compensation value;
And a compensation degree selecting unit for additionally improving the image quality state automatically compensated for;
Wherein the compensation level selection unit is configured to select a differential compensation of three levels (L, M, H). 3. The method of claim 2,
Wherein the automatic compensation mode selection unit and the compensation level selection unit of the operation mode selection unit include a push button to have an on / off function. 3. The method according to claim 1 or 2,
Wherein the image compensating unit performs image enhancement operations such as fog removal, noise reduction, dynamic range change, edge emphasis, and gamma filtering tuning;
Wherein the image quality adjusting control unit adjusts the degree of compensation by associating a predetermined image quality improvement control variable in each of the multiple modes through the automatic compensation mode selection unit and the compensation level selection unit of the operation mode selection unit to each mode. In accordance with the control signal, the digital signal output from the ADC is input to improve image quality through image enhancement, noise elimination, and fog removal. In the multi-mode, the image quality improvement control variable corresponding to each mode is adjusted An image compensation unit provided to the DAC; An automatic compensation mode selection unit for automatically compensating the image quality improvement level of the image compensation unit to an optimized compensation value and a compensation degree selection unit for additionally further improving the automatically compensated image quality level, And a control unit for receiving the selection signal output from the operation mode selection unit and controlling the ADC, the DAC, and the image compensation unit, A method of operating an automatic image correction apparatus comprising:
A first step of receiving an image photographed by the CCTV when the power is turned on;
A second step of determining whether the automatic compensation mode selection unit of the operation mode selection unit is in the ON operation state when an image photographed by the CCTV is supplied to the image compensation unit through the first step;
A third step of improving the image quality of the image compensating unit using a reference variable for image quality compensation (improvement) which is usually optimized when the automatic compensation mode selecting unit is judged to be in the ON operation state in the second step;
A fourth step of determining whether the compensation degree selection unit of the operation mode selection unit is in an ON operation state;
A fifth step of determining whether the compensation level selection unit has selected one of the differential compensation of three levels (L, M, H), which is set in advance, when it is determined that the compensation degree selection unit is in the ON state; And
And a sixth step of performing an additional compensation based on the image compensated in the third step according to the additional compensation mode 3 (L, M, H) determined in the process of the fifth step Of the security system.

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