KR102089046B1 - Method and apparatus for correcting image signal and system for analyzing image signal having the apparatus thereof - Google Patents

Abstract

An image signal correction apparatus according to an embodiment of the present invention, an input unit that receives an image signal obtained from an external searcher, samples the input image signal, calculates a representative signal level representing the level of the image signal, and calculates the By comparing a representative signal level with a predetermined reference value, the control unit determines a variable resistance value for adjusting the level of the image signal according to the comparison result, and adjusts the level of the image signal according to the variable resistance value determined by the control unit It may include a correction unit for correcting the image signal.

Description

Image signal correction method and apparatus, 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 thereof}

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 direction or position of the target necessary for calculating the guidance command to the guidance control device. According to the tracking method, these searchers may be classified into active searchers, semi-active searchers, and passive searchers, and may be classified into ultra-high frequency searchers, millimeter-wave searchers, infrared image searchers, and laser searchers according to the characteristics of the target signal.

In the case of an image infrared seeker, infrared rays are transmitted and received toward a target in order to detect or track a target, and an infrared image signal is acquired accordingly. Through the image signal inspection equipment, it is possible to analyze the acquired infrared image signal to identify a fixed or moving target.

In addition, in addition to the infrared image searcher that acquires an infrared image by transmitting and receiving an infrared signal, a searcher based on image capturing may acquire a target image to detect or track a target by capturing a target.

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

Due to the performance problem of the inspection equipment, there is a difficulty in accurately detecting or tracking a target, such as an analysis result having a high target false positive rate according to the distorted image signal state.

Korean Registered Patent No. 10-0651867 (Registration)

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

An image signal correcting apparatus according to an exemplary embodiment of the present invention for achieving the above object is an input unit that receives an image signal obtained from an external searcher, and a representative signal level representing the level of the image signal by sampling the input image signal And comparing the calculated representative signal level with a predetermined reference value to determine a variable resistance value for adjusting the level of the video signal according to the comparison result, and the image according to the variable resistance value determined by the controller It may include a correction unit for correcting the image signal by adjusting the level of the signal.

Further, the representative signal level may be an average level of the image signal calculated by sampling the received image signal at least once.

In addition, the control unit samples the input image signal at least once to generate a plurality of sampling signals, extracts the highest and lowest levels of each of the generated sampling signals, and for each sampling signal The representative signal level may be calculated using the extracted highest level and lowest level.

In addition, the controller may calculate a plurality of sampling levels as a result of summing the highest and lowest levels extracted for each sampling signal, and calculate the representative signal level by averaging the calculated plurality of sampling levels.

In addition, when the representative signal level is higher than the reference value as a result of comparing the representative signal level and the reference value, the controller generates a control signal for lowering the termination output level of the video signal, and the representative signal level is the If it is lower than the reference value, the end output level of the video signal may be increased, or a control signal for maintaining the current signal level may be generated.

Further, the control unit may further include an offset calculation unit for calculating an offset in consideration of the calculated representative signal level and the reference value.

In addition, the control unit determines the variable resistance value to be set to adjust the image signal level based on the calculated offset to generate the control signal, and the correction unit sets the variable resistance value determined from the control unit By adjusting the video signal level, the video signal can be corrected.

In order to achieve the above object, the searcher inspection system according to another embodiment of the present invention receives the video signal from the searcher and the searcher to obtain an image signal to search for an external object, and samples the video signal. Calculate a representative signal level representing the level of the video signal, compare the calculated representative signal level with a predetermined reference value, correct the video signal according to the comparison result, analyze the corrected video signal, and search for the searcher It may include a check device for checking the status of.

In addition, the inspection device, the control unit for sampling the video signal, and comparing the representative signal level and the reference value calculated for the sampled video signal to generate a control signal for adjusting the video signal level, from the control unit It may include a correction unit for correcting the image signal by setting a variable resistance value according to the applied control signal and a check unit for analyzing the corrected image signal and checking the status of the searcher.

In addition, 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 device samples the input video signal at least once to generate a plurality of sampling signals. Then, the highest and lowest levels of each of the plurality of generated sampling signals are extracted, and the representative signal level can be calculated using the extracted highest and lowest levels for each sampling signal.

In addition, when the representative signal level is higher than the reference value as a result of comparing the representative signal level and the reference value, the inspection device generates a control signal for lowering the terminal output level of the video signal, and the representative signal level is When it is lower than the reference value, the end output level of the video signal may be increased, or a control signal for maintaining the current signal level may be generated.

An image signal correction method according to another embodiment of the present invention for achieving the above object, receiving an image signal obtained from an external searcher, sampling the input image signal, and representing 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 image signal level according to a comparison result, and the image according to the determined variable resistance value And correcting the video signal by adjusting the signal level.

The image signal correction apparatus and method of the present invention derives an effect capable of minimizing distortion of an image as the image signal is corrected 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 showing a detailed configuration of an image signal correction unit according to an 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 showing an image signal correction method according to an embodiment of the present invention over time.
5 is a diagram illustrating in more detail a method for 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 and the contents described in the accompanying drawings, which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in several different forms.

It may, and is not limited to the described embodiment. 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 “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated. In addition, terms such as "... part", "... group", "module", and "block" described in the specification mean a unit that processes at least one function or operation, which is hardware or software or hardware. And 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 detailed descriptions of related well-known configurations or functions may obscure the subject matter of the present invention, detailed descriptions thereof may be omitted.

An apparatus according to the present disclosure searches for a target by capturing an image of an external target in order to detect or track the target, or a device for searching and tracking a target by acquiring an infrared image of the target by transmitting and receiving an infrared signal Can be

Based on the infrared image explorer and image capture, the inspection equipment that analyzes the image by receiving the image signal obtained from the explorer searching for the target is the image received by the inspection equipment according to the inspection cable and inspection system configuration when analyzing the image The state of the signal may be distorted.

In order to solve this problem, the video signal analysis system according to an embodiment of the present invention described below samples the size of a video signal received from a searcher in real time and through an algorithm installed in the video signal analysis system of the present invention. It is possible to prevent image distortion by adjusting the level of the received image signal. Hereinafter, a configuration of an image signal analysis system according to an 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. 1, the image signal analysis system according to an embodiment of the present invention may include a searcher (11, 12), and a searcher inspection device (20).

The searcher according to an embodiment of the present invention acquires an image signal in order to search for an external object. For example, the video signal analysis system of the present invention may include a plurality of searchers (11, 12).

At this time, the image signal acquired by the searcher of the present invention is an image signal obtained by capturing an image, which may be a general picture signal or an infrared image signal, preferably RS It may be a -170 / NTSC (National Television System Committee) image, and the image signal obtained from the explorer described below is assumed to be an RS-170 image signal.

The explorer inspection apparatus 20 according to the embodiment of the present invention receives the image signals obtained from the explorers 11 and 12, samples the image signals, and calculates a representative signal level representing the level of the image signals based on the received image signals Then, the calculated representative signal level is compared with a predetermined reference value, and the corrected video signal is analyzed as the level of the video signal is corrected 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 described above, the searcher inspection device 20 of the present invention may further include an image signal correction unit 100, a signal conversion unit 200, and a check unit 300. In this case, the image signal analysis system of the present invention according to another embodiment does not include the searchers 11 and 12, and may be composed of only an image signal correction unit, a signal conversion unit, and a check unit. That is, the explorer inspection device 20 of the present invention can be implemented as an independent system. Here, the inspection unit 300 may be implemented by, for example, a computer that analyzes an image signal.

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

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

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

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

In addition, the correction unit 130 according to an embodiment of the present invention 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.

Reference will be made to FIG. 3 to describe the control unit 120 of the present invention in relation to a more specific operation. 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 an embodiment of the present invention includes a sampling unit 121, a detection unit 122, a comparison unit 123, an offset calculation unit 124, and a variable resistance value determination unit ( 125) may be further included.

The sampling unit 121 according to an embodiment of the present invention first detects the magnitude (voltage value) of the image signal input to the input unit 110, then samples the image signal, and represents the representative signal based on the sampled image signal Levels can be calculated. The sampling unit 121 inputs an image to filter level values according to noise signals generated by internal or external noise in the process of inputting the image signal obtained by the searchers 11 and 12 to the input unit 110. Sample the signal multiple times.

As the image signal is sampled multiple times by the sampling unit 121, a plurality of sampling signals may be generated, and thereafter, the detection unit 122 according to an embodiment of the present invention is generated by the sampling unit 121 The highest level (maximum value) and the lowest level (minimum value) of each of the plurality of sampling signals are extracted. Then, the detection unit 122 calculates a plurality of sampling levels as a result of summing the highest and lowest levels of each signal, averaging the calculated plurality of sampling levels, and representative signal levels (average levels) for the input video signal. ).

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

Here, V _m is the 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 the video signal input by the sampling unit Is the number of times sampled.

In this way, after the representative signal level Vm of the image signal is calculated by the detection unit 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 detection unit 122, the offset calculation unit 124 of the present invention calculates a difference value between the predetermined reference value and the calculated representative signal level Vm. To find the offset. Here, the calculation formula for calculating the offset is as shown in <Equation 2> below.

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

The variable resistance value determination unit 125 of the present invention according to another embodiment may determine the variable resistance value to be set in order to adjust the image signal level in consideration of the offset calculated by the offset calculation unit 124. .

After the variable resistance value is determined by the variable resistance value determination unit 125, the correction unit 130 sets the determined variable resistance value to adjust the image signal level to correct the image signal.

According to another embodiment of the present invention, the control unit 120 performs sampling on the corrected image signal by repeatedly adjusting the signal level from the correction unit 130 to represent the level of the corrected image signal. 2 Calculate the representative signal level, and calculate the offset in consideration of the second representative signal level and the reference value. If the calculated offset does not fall within the preset offset allowable range, the level of the corrected video signal is re-established. The second variable resistance value for adjustment is again determined, and accordingly, the correction unit 130 sets the second variable resistance value as the control unit 120 determines the second variable resistance value, thereby correcting the level of the corrected image signal. It 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 and the reference value falls within the preset offset allowable range. Repeatedly, it may be implemented to continuously adjust the level of the video signal. Here, the allowable offset range may be set to -0.05V to + 0.05V, for example.

Referring back to FIG. 1, as described above, the image signal correction unit 100 corrects the image signal and then transmits the corrected image signal to the signal conversion unit 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 1-1st signal conversion unit 210 may convert the data signal obtained from the searcher into a USB communication signal, and the 2-2th signal conversion unit 220 may correct the image signal from the image signal correction unit 100. Can be converted to a digital signal.

In addition, the image signal analysis system of the present invention may be implemented to analyze the image signal obtained from a plurality of searchers (11, 12), and accordingly, the signal conversion unit 200, as shown in FIG. Signal converters for converting signals obtained from each of the searchers may be further included.

Next, the inspection unit 300 of the present invention checks the inspection device 20 for image analysis by analyzing the image signal converted from the signal conversion unit 200. The inspection unit 300 may analyze real-time data signals and image signals transmitted from the explorers 11 and 12 to determine whether the explorer and the inspection devices are in a normal state.

Next, with reference to FIGS. 4 to 5 to describe 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 later.

4 is a flowchart schematically showing an image 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 flow chart showing.

First, referring to FIG. 4, in step S410, the input unit 110 of the present invention receives the image signal obtained from the searchers 11 and 12.

Then, in step S420, the controller 120 according to an embodiment of the present invention samples the image signal received from the input unit 110 multiple times. Accordingly, the controller 120 may generate a plurality of sampled sampling signals.

Then, in step S430, the controller 120 calculates a representative signal level representing 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 S430 step in more detail, the controller 120 extracts the highest and lowest levels of each of the plurality of sampling signals generated by sampling the image signal obtained from the explorer multiple times. (S510).

Thereafter, the controller 120 calculates a plurality of sampling levels as a result of summing the highest and lowest levels of each signal, averages the calculated plurality of sampling levels, and represents a representative signal level (average of the input video signals). Level) to be calculated (S520).

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

4 is referenced again. According to the comparison result in which the control unit 120 compares the representative signal level and 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 control unit applies the generated control signal to the correction unit 130.

In step 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.

The fact that all the components constituting the embodiments of the present invention described above are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the object scope of the present invention, all of the components may be selectively combined and operated. In addition, although all of the components may be implemented as one independent hardware, a part or all of the components are selectively combined to perform a combined function of some or all of functions 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 recording medium (Computer Readable Media), such as a USB memory, CD disk, flash memory, etc., and read and executed by a computer, thereby implementing an embodiment 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 of ordinary skill 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. Therefore, the embodiments and the accompanying drawings disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain the scope of the technical spirit of the present invention. . The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the scope equivalent thereto 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: detection unit
123: comparison section
124: offset calculation unit
125: variable resistance value determination unit
130: correction unit
200: signal converter
300: inspection unit

Claims (13)

An input unit that receives an image signal obtained from an external searcher;
The input video signal is sampled a plurality of times to generate a plurality of first sampling signals, the first highest level and the first lowest level of each of the first sampling signals are extracted, and each of the first highest level and first A plurality of first sampling levels are calculated by summing the lowest level, the first sampling levels are averaged to calculate a first representative signal level, the first representative signal level is compared with a predetermined reference value, and a comparison result is obtained. A control unit for determining a variable resistance value for adjusting the level of the video signal accordingly; And
Includes a correction unit for correcting the image signal by adjusting the level of the image signal according to the variable resistance value determined by the control unit;
The control unit calculates a first offset in consideration of the first representative signal level and the reference value, and adjusts the level of the image signal based on the first offset, but the image corrected by adjusting the level of the image signal Sample a signal a plurality of times to generate a plurality of second sampling signals, calculate a second representative signal level using the second sampling signals, and calculate a second offset in consideration of the second representative signal level and the reference value Accordingly, when the second offset does not fall within a preset offset allowable range, the level of the corrected video signal is readjusted,
And the controller calculates the first representative signal level based on an equation that takes the first highest level, the first lowest level, and the number of times the video signal is sampled as variables. delete delete delete According to claim 1, The control unit,
As a result of comparing the first representative signal level and the reference value,
When the first representative signal level is higher than the reference value, a control signal for lowering the end output level of the video signal is generated,
And when the first representative signal level is lower than the reference value, increase a terminal output level of the video signal or generate a control signal to maintain the current signal level. delete delete delete A searcher that acquires an image signal to search for an external object; And
The video signal is received from the searcher, the video signal is sampled a plurality of times to generate a plurality of first sampling signals, the first highest level and the first lowest level of each of the first sampling signals are extracted, and the Each of the first highest level and the first lowest level is summed to calculate a plurality of first sampling levels, average the first sampling levels to calculate a first representative signal level, and calculate the first representative signal level and Includes a; comparing the predetermined reference value, correcting the image signal according to the comparison result, and analyzing the corrected image signal to check the status of the searcher;
The inspection device calculates a first offset in consideration of the first representative signal level and the reference value, and corrects the video signal based on the first offset, but corrects the video signal as the video signal is corrected. By sampling a plurality of times to generate a plurality of second sampling signals, calculating the second representative signal level using the second sampling signals, and calculating the second offset in consideration of the second representative signal level and the reference value If the second offset does not fall within the preset offset allowable range, the corrected video signal is corrected again, and an equation is used as a variable for sampling the first highest level, the first lowest level, and the number of times the video signal is sampled. Video signal analysis system, characterized in that for calculating the first representative signal level on the basis of. The method of claim 9, The inspection device,
A control unit generating a control signal for correcting the image signal;
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 checking unit that analyzes the corrected image signal and checks the status of the searcher;
Video signal analysis system further comprising a. delete The method of claim 9, The inspection device,
As a result of comparing the first representative signal level and the reference value,
When the first representative signal level is higher than the reference value, a control signal for lowering the end output level of the video signal is generated,
When the first representative signal level is lower than the reference value, the video signal analysis system, characterized in that to increase the end output level of the video signal, or to generate a control signal to maintain the current signal level. Receiving an image signal obtained from an external searcher;
The inputted video signal is sampled a plurality of times to generate a plurality of first sampling signals, the first highest level and the first lowest level of each of the first sampling signals are extracted, and each of the first highest level and the first A plurality of first sampling levels are calculated according to the summation of the lowest level, the first sampling levels are averaged to calculate a first representative signal level, and the calculated first representative signal level and a predetermined reference value are considered to determine the first representative signal level. Calculating an offset and determining a variable resistance value for adjusting the level of the video signal based on the first offset; And
Comprising the step of correcting the video signal by adjusting the level of the video signal according to the determined variable resistance value;
By adjusting the level of the video signal, the corrected video signal is sampled a plurality of times to generate a plurality of second sampling signals, the second representative signal level is calculated using the second sampling signals, and the second representative signal level And re-adjusting the level of the corrected video signal if the second offset does not fall within a preset offset allowable range as the second offset is calculated in consideration of the reference value.
In the determining of the variable resistance value, the first representative signal level is calculated based on an equation in which the first highest level, the first lowest level, and the number of times the video signal is sampled are variables. Video signal correction method.

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