KR20200016502A - Method and apparatus for correcting image signal and system for analyzing image signal having the apparatus thereof - Google Patents

Abstract

The present invention relates to an image signal correction method, an apparatus thereof, and an image signal analysis system having the same. According to an embodiment of the present invention, the image signal correction apparatus can comprise: an input part receiving an image signal obtained from an external seeker; a control part sampling the input image signal, calculating a representative signal level representing the level of the image signal, comparing the calculated representative signal level with a predetermined reference value, and determining a variable resistance value for adjusting the level of the image signal; and a correction part correcting the image signal by adjusting the level of the image signal according to the variable resistance value determined in the control part.

Description

Method and apparatus for correcting image signal, and image signal analysis system equipped with the apparatus {Method and apparatus for correcting image signal and system for analyzing image signal having the apparatus

The present invention relates to an image signal correction apparatus and method, and an image signal analysis system equipped with the image signal correction apparatus.

A seeker is a device that detects or tracks a target and provides the guidance steering device with the direction or position of the target required to calculate the guidance command. Such a searcher may be classified into an active searcher, a semi-active searcher, a passive searcher, etc. according to a tracking method, and may be classified into an ultra-high frequency searcher, a millimeter wave searcher, an infrared image searcher, a laser searcher, and the like according to characteristics of a target signal.

In the case of an image infrared seeker, an infrared image signal is transmitted to and received from the target to detect or track the target. Video signal inspection equipment can analyze the infrared image signals thus acquired to identify fixed or moving targets.

Further, in addition to an infrared image explorer for transmitting and receiving an infrared signal to obtain an infrared image, the explorer based on image capturing the target may acquire a target image to detect or track the target.

However, in the inspection equipment that analyzes the image by receiving the image signal obtained from the infrared image explorer and the navigator searching for the target based on the imaging, the image is received by the inspection equipment according to the inspection cable and the inspection system configuration. The state of the video signal may be distorted.

Due to the performance problem of the inspection equipment, there was a difficulty in accurately detecting or tracking a target, such as a high rate of target false detection rate according to a distorted video signal state.

Korea Registered Patent No. 10-0651867 (registered)

An object of the present invention is to provide an image signal correcting apparatus and method and an image signal analysis system capable of correcting an image signal by adjusting a level of an image signal obtained from a searcher to solve the above-described conventional problems.

According to an aspect of the present invention, there is provided an apparatus for correcting an image signal, the input unit receiving an image signal obtained from an external searcher, and a representative signal level representing the level of the image signal by sampling the received image signal. And a control unit for comparing the calculated representative signal level with a predetermined reference value and determining a variable resistance value for adjusting the level of the video signal according to a comparison result, and the image according to the variable resistance value determined from the control unit. It may include a correction unit for correcting the image signal by adjusting the level of the signal.

The representative signal level may be an average level of the video signal calculated by sampling the input video signal at least once.

The controller may be further configured to generate a plurality of sampling signals by sampling the input image signal at least once, extract the highest level and the lowest level of each of the generated plurality of sampling signals, and, for each of the sampling signals, The representative signal level may be calculated using the extracted highest and lowest levels.

The controller may calculate a plurality of sampling levels according to the sum of the highest and lowest levels extracted for each sampling signal, and calculate the representative signal level by averaging the calculated plurality of sampling levels.

The controller may be further configured to generate a control signal for reducing the terminal output level of the video signal when the representative signal level is higher than the reference value as a result of comparing the representative signal level with the reference value. If lower than the reference value, the terminal output level of the video signal may be increased or a control signal may be generated to maintain the current signal level.

The controller may further include an offset calculator configured to calculate an offset in consideration of the calculated representative signal level and the reference value.

The control unit may generate the control signal by determining a variable resistance value to be set to adjust the image signal level based on the calculated offset, and the correction unit sets the variable resistance value determined from the control unit. The video signal can be corrected by adjusting the video signal level.

In accordance with yet another aspect of the present invention, a searcher inspection system includes a searcher for acquiring an image signal and a video signal from the searcher to sample an external object, and sample the video signal. A representative signal level representative of the level of the video signal is calculated, the calculated representative signal level is compared with a predetermined reference value, the video signal is corrected according to a comparison result, and the corrected video signal is analyzed to analyze the searcher. It may include a check device for checking the state of the.

The control apparatus may further include: a controller configured to sample the video signal and generate a control signal for adjusting the video signal level by comparing the representative signal level calculated with respect to the sampled video signal with the reference value; The control unit may include a correction unit correcting the image signal by setting a variable resistance value according to the control signal applied, and a check unit checking the state of the searcher by analyzing the corrected image signal.

The representative signal level is an average level of the video signal calculated by sampling the input video signal at least once, and the inspection apparatus generates the plurality of sampling signals by sampling the input video signal at least once. The highest and lowest levels of each of the generated sampling signals may be extracted, and the representative signal level may be calculated using the highest and lowest levels extracted for each of the sampling signals.

In addition, the inspection apparatus compares the representative signal level with a reference value, and when the representative signal level is higher than the reference value, generates a control signal for lowering the termination output level of the video signal, and the representative signal level is increased. When lower than the reference value, the terminal output level of the video signal may be increased or a control signal may be generated to maintain the current signal level.

According to another aspect of the present invention, there is provided a method for correcting an image signal, the method comprising: receiving an image signal obtained from an external searcher, sampling the received image signal to represent the level of the image signal; Calculating a representative signal level, comparing the calculated representative signal level with a predetermined reference value, determining a variable resistance value for adjusting the video signal level according to a comparison result, and determining the image according to the determined variable resistance value Compensating the video signal by adjusting the level of the signal.

The image signal correcting apparatus and method of the present invention derives an effect of minimizing distortion of an image by correcting the image signal by adjusting the level of the image signal obtained from the searcher.

1 is a block diagram schematically showing the configuration of a video signal analysis system according to an embodiment of the present invention.
2 is a block diagram illustrating a detailed configuration of an image signal correcting unit according to an exemplary embodiment of the present invention.
3 is a diagram schematically showing a detailed configuration of a control unit according to an embodiment of the present invention.
4 is a flowchart schematically illustrating a video signal correction method according to an embodiment of the present invention over time.
5 is a diagram illustrating in detail a method of determining a variable resistance value for correcting an image signal according to an embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention may be embodied in many different forms.

It is possible to, but is not limited to the embodiments described. In addition, in order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals in the drawings indicate the same members.

Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms "... unit", "... unit", "module", "block", etc. described in the specification mean a unit that processes at least one function or operation, which means hardware, software, or hardware. And a combination of software.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

The searcher according to the present disclosure searches for a target by capturing an image of an external target to detect or track the target, or an apparatus for searching and tracking a target as the infrared image of the target is obtained by transmitting and receiving an infrared signal. Can be.

Image received from the inspection equipment according to the inspection cable and the inspection system configuration in the analysis of the image in the inspection equipment for analyzing the image by receiving the image signal obtained from the infrared image explorer and the explorer for searching the target based on the image shooting The state of the signal may be distorted.

In order to solve this problem, a video signal analysis system according to an embodiment of the present invention described below samples in real time the magnitude of a video signal received from a searcher, through an algorithm mounted in the video signal analysis system of the present invention. By adjusting the level of the received video signal it is possible to prevent image distortion. Hereinafter, the configuration of an image signal analysis system according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 is a block diagram schematically showing the configuration of a video signal analysis system according to an embodiment of the present invention. Referring to FIG. 1, an image signal analysis system according to an exemplary embodiment of the present invention may include searchers 11 and 12 and a searcher checking apparatus 20.

The searcher according to an embodiment of the present invention acquires an image signal to search for an object existing outside. For example, the video signal analysis system of the present invention may include a plurality of searchers 11 and 12.

In this case, the image signal obtained by the searcher of the present invention is an image signal obtained by capturing an image, and may be a general image signal or an infrared image signal, but preferably an RS It may be a -170 / NTSC (National Television System Committee) image, and it is assumed that the image signal obtained from the searcher described below is an RS-170 image signal.

The searcher checking apparatus 20 according to an exemplary embodiment of the present invention receives an image signal obtained from the searchers 11 and 12, samples the image signal, and calculates a representative signal level representing the level of the image signal based on the image signal. In addition, the calculated representative signal level is compared with a predetermined reference value, and the corrected video signal is analyzed by correcting the level of the video signal according to the comparison result to check the state of the searcher and the state of the inspection equipment provided in the inspection system. .

As such, the searcher inspecting apparatus 20 of the present invention may further include an image signal corrector 100, a signal converter 200, and a inspector 300. In this case, the video signal analysis system of the present invention according to another embodiment may not include the searchers 11 and 12 and may include only the video signal corrector, the signal converter, and the checker. That is, the searcher checking apparatus 20 of the present invention may be implemented as an independent system. Here, the checker 300 may be implemented by, for example, a computer that analyzes an image signal.

2 is a block diagram showing a detailed configuration of an image signal corrector 100 according to an embodiment of the present invention. As another example of the present invention, the image signal corrector 100 is formed of an image signal correction device. It can be implemented as an independent device. That is, the image signal correcting unit and the image signal correcting apparatus, which may be implemented in different forms according to various embodiments, are configured to perform substantially the same operation. Hereinafter, the image signal correcting unit 100 may be unified for convenience. Explain.

Referring to FIG. 2, the image signal corrector 100 according to the embodiment of the present invention may further include an input unit 110, a controller 120, and a corrector 130.

First, the input unit 110 of the present invention receives an image signal obtained from the searcher (11, 12).

In addition, the control unit 120 according to an embodiment of the present invention samples the video signal received from the input unit 110 to calculate a representative signal level representing the level of the video signal, and calculates the representative signal level and the predetermined reference value. In comparison, a control signal for adjusting the video signal level may be generated according to the comparison result. Here, the representative signal level is an average level representative of the video signal received from the input unit 110, the reference value is a reference level according to a predetermined reference voltage value.

The correction unit 130 may correct the image signal input to the input unit 110 by setting a variable resistance value according to a control signal applied from the control unit 120.

The controller 120 of the present invention will be described with reference to FIG. 3 to describe more specific operations. 3 is a diagram schematically showing a detailed configuration of the control unit 120 according to an embodiment of the present invention. As shown in FIG. 3, the control unit 120 according to the embodiment of the present invention includes a sampling unit 121, a detection unit 122, a comparator 123, an offset calculator 124, and a variable resistance value determiner ( 125) may be further included.

The sampling unit 121 according to an exemplary embodiment of the present invention first detects the magnitude (voltage value) of the image signal input to the input unit 110, and then samples the image signal, based on the sampled image signal. The level can be calculated. The sampling unit 121 filters the level values according to the noise signal generated by the internal or external noise while the image signals acquired by the searchers 11 and 12 are input to the input unit 110. Sample the signal multiple times.

As the image signal is sampled by the sampling unit 121 a plurality of times, a plurality of sampling signals may be generated. After that, the detection unit 122 according to the embodiment of the present invention may generate the sampling signal by the sampling unit 121. The highest level (maximum value magnitude) and the lowest level (minimum value magnitude) of each of the plurality of sampling signals are extracted. The detector 122 calculates a plurality of sampling levels as the sum of the highest level and the lowest level of each signal, averages the calculated plurality of sampling levels, and represents a representative signal level (average level) for the input image signal. ) Is calculated.

The representative signal level of the present invention as described above may be calculated using Equation 1 below.

Here, V _m is a representative signal level, V _n max is the highest level of each of the plurality of sampling signals, V _n min is the lowest level of each of the plurality of sampling signals, and n is an image signal input by the sampling unit. Is the number of times sampled.

In this way, after the representative signal level Vm of the video signal is calculated by the detector 122, the comparator 123 of the present invention compares the calculated representative signal level Vm with a predetermined reference value.

In addition, after the representative signal level Vm of the image signal is calculated by the detector 122, the offset calculator 124 of the present invention calculates a difference value between the predetermined reference value and the calculated representative signal level Vm. To obtain the offset. Here, the calculation formula for calculating the offset is shown in Equation 2 below.

The variable resistance value determiner 125 according to an exemplary embodiment of the present invention compares the representative signal level with the reference value by the comparator 123, and when the representative signal level is higher than the reference value, the terminal output level of the video signal. When the representative signal level is lower than the reference value, the variable resistance value for lowering the value may be increased, or the variable resistance value for maintaining the current signal level may be determined.

According to another exemplary embodiment, the variable resistance value determiner 125 of the present invention may determine a variable resistance value to be set to adjust the image signal level in consideration of the offset calculated by the offset calculator 124. .

After the variable resistance value is determined by the variable resistance value determiner 125, the correction unit 130 corrects the video signal by setting the determined variable resistance value to adjust the image signal level.

According to another embodiment of the present invention, the control unit 120 repeats sampling of the corrected image signal by adjusting the signal level from the corrector 130 to represent the level of the corrected image signal 2 calculating the representative signal level and calculating the offset in consideration of the second representative signal level and the reference value, and recalculating the level of the corrected video signal if the calculated offset does not fall within a preset offset tolerance; The second variable resistor value for adjustment is again determined, and accordingly, the correction unit 130 sets the second variable resistor value as the controller 120 determines the second variable resistor value, thereby adjusting the level of the corrected image signal. Can be implemented to readjust.

That is, the image signal correction unit 100 of the present invention performs the above operation until the offset calculated by comparing the sampling representative signal level calculated by sampling the image signal with the reference value corresponds to the preset allowable offset range. Repeatedly, it may be implemented to continuously adjust the level of the video signal. Here, the offset tolerance may be set to, for example, -0.05V to + 0.05V.

Referring back to FIG. 1, as described above, the image signal corrector 100 corrects the image signal and then transmits the corrected image signal to the signal converter 200. Here, the signal converter 200 according to an embodiment of the present invention may further include a 1-1 signal converter 210 and a 1-2 signal converter 220. The first-first signal converter 210 may convert a data signal obtained from the searcher into a USB communication signal, and the second-second signal converter 220 may correct the video signal corrected by the video signal corrector 100. Can be converted into a digital signal.

In addition, the video signal analysis system of the present invention may be implemented to analyze the video signals obtained from the plurality of searchers (11, 12), accordingly, the signal converter 200, as shown in FIG. The apparatus may further include signal converters for converting a signal obtained from each of the searchers of.

Next, the inspection unit 300 of the present invention inspects the inspection apparatus 20 for image analysis by analyzing the image signal converted from the signal conversion unit 200. The inspection unit 300 may analyze the real-time data signal and the image signal transmitted from the searchers 11 and 12 to determine whether the states of the searcher and the check device are normal.

Next, a method of correcting an image signal obtained from a searcher using the image signal correction apparatus 100 of the present invention will be described below with reference to FIGS. 4 to 5.

4 is a flowchart schematically illustrating a video signal correction method according to an embodiment of the present invention over time, and FIG. 5 is a detailed operation method between S420 and S440 of FIG. 4 according to an embodiment of the present invention. It is a flowchart showing.

First, referring to FIG. 4, in operation S410, the input unit 110 receives an image signal obtained from the searchers 11 and 12.

In operation S420, the controller 120 according to the exemplary embodiment of the present invention samples the image signal received from the input unit 110 a plurality of times. Accordingly, the controller 120 may generate a plurality of sampled sampling signals.

In operation S430, the control unit 120 calculates a representative signal level representative of the level of the sampled signal, and compares the calculated representative signal level with a predetermined reference value.

Referring to FIG. 5 to describe the operation S430 in detail, the highest level and the lowest level of each of the plurality of sampling signals generated by sampling the video signal acquired from the searcher by the controller 120 are extracted. (S510).

Thereafter, the controller 120 calculates a plurality of sampling levels according to the sum of the highest and lowest levels of each signal, averages the calculated plurality of sampling levels, and represents a representative signal level (average) for the input image signal. Level) (S520).

In this way, after the representative signal level is calculated, the controller 120 calculates an offset using the predetermined reference value and the calculated representative signal level (S530).

Reference is again made to FIG. 4. According to the comparison result of the control unit 120 compares the representative signal level with the reference value, the control unit 120 determines the variable resistance value in step S440, and generates a control signal to set the variable resistance value determined in step S450, The controller applies the generated control signal to the correction unit 130.

In operation S460, the correction unit 130 corrects the image signal by adjusting the image signal level by setting the variable resistance value determined according to the applied control signal.

Although all components constituting the embodiments of the present invention described above are described as being combined or operating in combination, the present invention is not necessarily limited to these embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all the components may be implemented as one independent hardware, each or some of the components are selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. In addition, such a computer program is stored in a computer readable medium such as a USB memory, a CD disk, a flash memory, and the like, and can be read and executed by a computer, thereby implementing embodiments of the present invention. The recording medium of the computer program may include a magnetic recording medium, an optical recording medium and the like.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

11, 12: Explorer
100: video signal correction unit
110: input unit
120: control unit
121: sampling unit
122: detector
123: comparison unit
124: offset calculation unit
125: variable resistance value determiner
130: correction unit
200: signal conversion unit
300: inspection unit

Claims (13)

An input unit receiving an image signal obtained from an external searcher;
Sampling the input video signal to calculate a representative signal level representative of the level of the video signal, comparing the calculated representative signal level with a predetermined reference value, and adjusting the level of the video signal according to a comparison result A controller for determining a variable resistance value; And
A correction unit correcting the image signal by adjusting the level of the image signal according to the variable resistance value determined by the controller;
Image signal correction apparatus comprising a. The method of claim 1,
And the representative signal level is an average level of the video signal calculated by sampling the received video signal at least once. The method of claim 1,
The control unit,
Sampling the received image signal at least once to generate a plurality of sampling signals, extracting the highest level and the lowest level of each of the generated plurality of sampling signals, and extracting the highest level and the lowest for each sampling signal. And calculating the representative signal level using the level. The method of claim 3,
The control unit,
And calculating the representative signal level by calculating the plurality of sampling levels by aggregating the extracted highest and lowest levels with respect to each sampling signal, and averaging the calculated plurality of sampling levels. Signal correction device. The method of claim 1, wherein the control unit,
As a result of comparing the representative signal level with a reference value,
If the representative signal level is higher than the reference value, and generates a control signal for lowering the terminal output level of the video signal,
And when the representative signal level is lower than the reference value, generating a control signal for increasing the terminal output level of the video signal or maintaining the current signal level. The method of claim 1,
The controller further includes an offset calculator configured to calculate an offset in consideration of the calculated representative signal level and the reference value. The method of claim 6,
The controller generates the control signal by determining a variable resistance value to be set to adjust the video signal level based on the calculated offset,
And the corrector corrects the video signal by setting a variable resistance value determined by the controller to adjust the video signal level. The method of claim 6,
The controller is configured to repeatedly perform sampling on the corrected video signal by adjusting the signal level from the corrector to calculate a second representative signal level representing the level of the corrected video signal, and to calculate the second representative signal level. Determining the second variable resistance value for re-adjusting the level of the corrected image signal when the calculated offset does not fall within a preset allowable offset range by calculating the offset in consideration of the reference value,
And the corrector adjusts the level of the corrected video signal according to the second variable resistance value determined by the controller. A searcher for obtaining an image signal to search for an external object; And
The video signal is received from the searcher, the video signal is sampled to calculate a representative signal level representing the level of the video signal, and the calculated representative signal level is compared with a predetermined reference value. A checking device for correcting an image signal and checking a state of the searcher by analyzing the corrected image signal;
Image signal analysis system comprising a. The method of claim 9, wherein the inspection device,
A controller configured to sample the video signal and generate a control signal for adjusting the video signal level by comparing the representative signal level calculated with respect to the sampled video signal with the reference value;
A correction unit correcting the image signal by setting a variable resistance value according to the control signal applied from the control unit; And
A checker to check the state of the searcher by analyzing the corrected video signal;
Image signal analysis system further comprises. The method of claim 9,
The representative signal level is an average level of the video signal calculated by sampling the input video signal at least once,
The inspection apparatus may generate a plurality of sampling signals by sampling the input image signal at least once, extract the highest level and the lowest level of each of the generated plurality of sampling signals, and extract the respective sampling signals. And calculating the representative signal level using the highest level and the lowest level. The method of claim 11, wherein the inspection device,
As a result of comparing the representative signal level with a reference value,
If the representative signal level is higher than the reference value, and generates a control signal for lowering the terminal output level of the video signal,
And when the representative signal level is lower than the reference value, generating a control signal for increasing the terminal output level of the video signal or maintaining the current signal level. Receiving an image signal obtained from an external searcher;
A variable for adjusting the video signal level according to a comparison result by calculating the representative signal level representing the level of the video signal by sampling the received video signal, comparing the calculated representative signal level with a predetermined reference value Determining a resistance value; And
Correcting the video signal by adjusting the level of the video signal according to the determined variable resistance value;
Image signal correction method comprising a.

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