KR101453370B1 - Focus display unit - Google Patents

Abstract

The present invention relates to an apparatus capable of manually adjusting the focus of a lens when installing various surveillance cameras employing a closed circuit TV (CCTV) cameras. More specifically, the apparatus may include: an image signal input unit to receive an image signal obtained through the photographing of a camera, a focus signal extracting unit to extract a focus-related signal from the image signal, a focus information signal forming unit to filter and correct the focus-related signal to form a pure focus information signal allowing quantization, and a focus information display unit to display the quantified focus information signal. According to the present invention, focus information of the camera module is converted into quantified values, and the maximum focus value, which is a memorized target focus value, and real-time focus value input in real time are displayed, so that a user can check the focusing state through a text, numbers, or voice in real time.

Description

{Focus display unit}

The present invention relates to an apparatus and a system for manually adjusting a focus of a lens in installation and construction of various surveillance systems using a CCTV camera.

1 is a block diagram for explaining generation of a video signal of a surveillance camera. 1, a CCD (solid-state image pickup device) 20 for converting an image of an object coming in through the lens 10 into an electric signal, an amplifier 30 for amplifying a video signal converted into an electric signal, The signal on the object amplified through the encoder 40 is outputted as a video signal. Through this video signal, the monitor reproduces the image of the subject.

Conventionally, there is a problem that when a monitor camera for generating such a video signal is installed, the focus is adjusted while watching the monitor, or when the position of the monitor and the camera are far apart, two people are required to watch the focus adjuster and the monitor.

This problem is clearly revealed in the field of installation and construction of various surveillance systems using CCTV cameras.

Generally, in the installation of various surveillance systems using CCTV cameras, manual focusing of the lens has been performed by focusing on the monitor and judging by the naked eye. Since the monitor is located at the remote place due to the nature of CCTV installation, The worker and the person watching the monitor are separated, and the two people have to work by focusing on the communication while using the wireless communication. If the portable monitor is provided separately, it is possible to perform the focusing work alone, There is a problem that it is difficult to obtain a monitor having a high resolution that is easy to focus on. In addition, there is no market other than expensive monitors used for broadcasting.

Therefore, using a low-resolution handheld monitor, it was impossible to focus correctly and eventually reworked with the help of others. In order to solve such a problem, a camera equipped with an auto focusing lens has been used, but it is expensive and various lenses can not be selected and used.

Korean Patent Publication No. 10-1995-0026194

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a video camera using a lens to be focused, And displaying a real-time focus value, which is a real-time input value, which is a memorized target focus value, which is a reference focus value, on the basis of the value of the focus point.

As a means for solving the above-mentioned problems, the present invention provides a video signal processing apparatus comprising: a video signal input unit receiving a video signal photographed through a camera; A focus signal extracting unit for extracting a focus related signal from the image signal; A focus information signal forming unit for filtering and correcting the focus related signal to form a pure focus information signal that can be quantized; A focus information display unit for displaying the digitized focus information signal; To provide a focus alignment indicator.

In particular, the focus signal extractor includes a clamp circuit for clamping an analog video signal, a sampling circuit for extracting a focus related signal including a luminance signal from the clamped video signal, and a signal amplifier for amplifying the extracted focus related signal. As shown in FIG.

The focus information forming unit may include a high-pass filter for filtering the low-frequency component of the focus-related signal and rearranging the high-frequency band component related to the focus value, an integrator for integrating the focus-related signal to output a representative value; And a data quantization unit for quantizing the signal integrated in the integrator. Further, the focus information forming unit may include a rectifying circuit for rectifying the focus-related signal passed through the integrator and outputting a DC voltage in units of a horizontal synchronizing signal (Hsync), a low-pass filter for removing unnecessary noise of the focus- And a peak & hold circuit for storing the DC output voltage passed through the rectifying circuit by reflecting the maximum value for one field as a real time focus value.

Particularly, the focus information signal forming unit according to the present invention includes a focus information signal digitizing unit for digitizing the quantized focus information signal by synchronizing with the field period of the video signal; And a focus indicator that further includes a focus indicator.

In this case, the focus information signal quantization unit may include: a buffer memory unit for storing a maximum value of the digitized focus information signal; And a numerical comparison unit for comparing a maximum value stored in the buffer memory unit with a currently input value.

Particularly, the focus information display unit according to the embodiment of the present invention may be configured to display a maximum focus value, which is a memorized target focus value, and a real-time focus value that is input in real time, based on the numerical focus value obtained by the focus information signal quantization unit .

The focus information display unit according to the present invention may further include a focus information display unit for inputting a numerical focus value acquired by the focus information signal evaluation unit to the audio synthesizer and outputting a voice signal Forming portion; As shown in FIG. In this case, the voice signal forming section may include a frequency modulation signal forming section for inputting the obtained numerical focus value into the voice synthesizing apparatus to generate a frequency modulated signal proportional to the value acquired in the audible frequency band, And a voice output unit for outputting voice by comparing the maximum value of the stored focus information signal.

In addition, the present invention can be applied to an unmanned camera system including a focus indicator of the present invention.

According to an embodiment of the present invention, in a variety of surveillance systems including CCTV, the focus information of a camera module is converted into numerical values, and based on the digitized focus value, a maximum focus value, which is a memorized target focus value, There is an effect that a focus value can be displayed and a user can confirm whether the focus is matched in real time and display it.

In particular, when working for focus adjustment, the difference from the textual target focus value is displayed numerically or output as a voice, so that even when a person performs a focus correction operation, it can be adjusted easily, So that it is possible to perform correction based on the degree of the numerical value and thus the focus correction operation is highly accurate.

1 is a block diagram for explaining generation of a video signal of a surveillance camera.
FIG. 2 shows a block diagram of a focusing indicator according to an embodiment of the present invention, and FIG. 3 is a system diagram schematically showing a block diagram of FIG.
4 to 10 are block diagrams and implementation views of resultant video signals that pass through the inventive building blocks.
FIG. 11 illustrates a system operation sequence of a focus indicator according to an embodiment of the present invention.

Hereinafter, the configuration and operation according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description with reference to the accompanying drawings, the same reference numerals denote the same elements regardless of the reference numerals, and redundant description thereof will be omitted. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

FIG. 2 shows a block diagram of a focusing indicator according to an embodiment of the present invention, and FIG. 3 is a system diagram schematically showing a block diagram of FIG. FIGS. 4 to 10 are reference views showing block diagrams of resultant video signals passing through the constituent blocks of the present invention.

2 and 3, the focusing indicator according to an embodiment of the present invention includes a video signal input unit 110 for receiving a video signal photographed through a camera, A focus information signal forming unit 130 for forming a pure focus information signal capable of quantizing by filtering and correcting the focus related signal, a focus information display unit 130 for displaying the quantized focus information signal, 150). Particularly, the feature of the focus alignment indicator according to the present invention is that, when a human operator performs focusing operation with the naked eye in an installation environment such as CCTV using various manual focus lenses, the degree of focus is easily determined by a person And provides various techniques for expressing various types of voice so as to easily implement focusing work through voice even in a situation where it is difficult to work while watching a monitor.

The video signal input unit 110 may include not only a video signal input from a CCTV system including a closed circuit system and an open circuit system but also a video signal input / . Accordingly, the video signal input unit 110 receives a video signal captured by an external camera module as a video signal. In this case, the video signal is a composite signal including a luminance signal, a chroma signal, and a synchronization signal, that is, a composite video signal (CVBS), and the composite video signal has a video signal (chrominance, luminance, There is a feature that all the signal lines are mixed and the audio signal is not included. The video signal input from the video signal input unit 110 of the present invention is a composite signal input in the form of an analog video signal.

Then, the focus signal extracting unit 120 extracts a signal related to the focus (hereinafter referred to as 'focus related signal') in the composite signal.

As shown in the system block diagram of FIG. 2 and FIG. 3, the focus signal extractor 120 includes a clamp circuit 121 for clamping an analog video signal, a focus-related signal And a signal amplifier 123 for amplifying the extracted focus related signal. In this case, the video signal input from the video signal input unit 110 is an analog signal as described above, and the clamp circuit 121 clamps the video signal on the basis of the pedestal level, In order to extract a signal relating to a specific value, that is, a focus.

In particular, the focus signal extraction unit 120 of the present invention implements sampling and extracts only a signal of a valid screen period among video signals. In addition, it is preferable that the extracted signal is amplified and filtered to be converted into a pure focus information signal, and after the average value is reset, reset. In addition, the sampling and reset samples and resets the field period of the video signal such as 1/60 seconds or 1/50 seconds so that the focus value display can proceed. Specifically, a clamping operation is performed on a pedestal level in an input video signal to form a sampling interval, and a resultant value obtained by sampling a synchronizing signal (Sync), a burst portion, and the like may be removed to sample only a necessary portion of the effective video interval See Fig. Such a sampling operation is repeatedly performed during one field (i.e., a valid video interval) to extract a necessary signal. The effective video interval may be varied according to a National Television System Committee (NTSC) scheme, a Phase Alternation Line (PAL) scheme, or the like. For example, a range of 22 to 255 Hsync may be set as an effective video interval.

Then, the focus signal forming unit 130 filters and corrects the focus related signal extracted by the focus signal extracting unit 120 to form a pure focus information signal that can be quantized. More specifically, the focus signal forming unit 130 includes a high-pass filter (HFP) 131 for rearranging the focus-related signal as a high-frequency component, a data quantization unit 132 for quantizing data of the focus- And an integrator 133 for integrating and outputting the focus related signal.

The high-pass filter (HFP) 131 sets a focus-related signal to a cutoff frequency exceeding a specific reference value, and calculates a focus value using the signal. That is, when the focal point of the analog video signal is correctly matched, the high frequency components are increased. In this case, only the specific frequency band (range) is amplified and the signal is amplified. . The signal obtained through the high frequency band amplification is passed through the high frequency filter to cut off the low frequency band which is not related to the focus value and only the high frequency band signals closely related to the focus value are inputted into the integrator 132.

The integrator 132 integrates a high-frequency signal transmitted through the high-pass filter 131 to output a representative value, and the representative value indicates a focus value. The integrated signals are quantized through the data quantization unit 132. In general, the high frequency component represents a fine part of the image due to the perception of the image, and the high frequency component having information is quantized to increase the efficiency of the focus information.

The focus information forming unit 130 includes a rectifying circuit for rectifying the focus-related signal passed through the integrator, a low-pass filter for removing unnecessary noise of the focus-related signal passed through the rectifying circuit, and a DC And a peak & hold circuit that memorizes and reflects the output voltage as a real-time focus value for a maximum value during one field. When the integrated signal passes through the rectifying circuit, a DC voltage is output in units of a horizontal synchronizing signal (Hsync). The output voltage passes through a peak-and-hold circuit, and the maximum voltage Let it reflect the focus value. Of course, it is desirable to clear the peak-and-hold circuit after reading the DCized focus value before one field ends and two fields start. In other words, Pick & Hold operation is performed in the Hsync cycle, and the Pick & Hold circuit operation can be performed in the Vsync cycle.

In particular, in this case, the focus information signal quantization unit 140 uses the extracted focus value to digitize the quantized signal at the maximum speed by synchronizing the quantized signal with the field period of the video signal, and outputs the maximum value of the quantized focus value to the buffer memory 160 ) In order to be able to store it. The maximum value of the focus value stored in the buffer memory unit 160 can be displayed as a character in the focus information display unit 150. In this case, The maximum value and the current input value can be displayed at the same time so that the operator can perform an operation to display a work target value that is set to the maximum value during the focusing work. That is, a maximum focus value, which is a memorized target focus value, and a real-time focus value that is input in real time can be displayed on the basis of the numerical focus value acquired by the focus information signal quantization unit.

Further, the focus information display unit 150 inputs the numerical focus value acquired by the focus information signal digitization unit 140 to the speech synthesizer, and outputs the maximum value and the numerical value of the newly inputted focus value by voice And may further comprise a voice signal forming unit 180.

The voice signal forming unit 180 includes a frequency modulation signal forming unit 181 for inputting the obtained numerical focus value to the voice synthesizing apparatus to generate a frequency modulated signal proportional to the value acquired in the audible frequency band, And a voice output unit 182 for comparing the digitized focus value with the maximum value of the stored focus information signal to output a voice. The function of the voice signal forming unit is to display the difference between the target focus value (including the Arabic numeral) and the target focus value at the time of the focus adjustment operation, or output it by voice so that even when a person performs the focus correction operation, In addition, it is possible to perform a fast operation by making it possible to perform a focus adjustment through visual confirmation of an image, and furthermore, it is possible to perform correction based on a numerical value, thereby realizing an effect of correcting the focus correction operation.

The progressive blocks of the focus alignment indicator according to the present invention described above with reference to FIGS. 2 and 3 will be described below.

4 is an example of a composite signal including the color signals R, G, and B shown in FIG. 5 is an exemplary view of a source of a composite video signal (CVBS). In the graph of FIG. 5, IRE is a unit used for defining the level of a video signal, and the Institute of Radio Engineers (IRE) usually defines the size of a video signal.

6 is a graph illustrating a video clamp block, and a blue dotted line portion indicates the position of the video clamp. FIG. 7A is an exemplary diagram of a sampled block of a composite video signal (CVBS) in the sampling circuit. FIG.

Referring to FIGS. 6 and 7A, FIG. 7B shows a full color bar pattern signal in which an input video signal is expressed in units of a horizontal synchronization signal (Hsync), and a sampling period is shown in the image. FIG. 7C shows the result of sampling the sampling period X shown in FIG. 7B based on the pedestal level.

As shown in FIG. 7C, when the pattern signal of the sampling interval X in FIG. 7B is compared with the image of the signal extracted in the sampling interval of FIG. 7C, the sync signal portion and the burst portion are removed, It can be confirmed that only a part of the valid video segment is sampled. That is, as described above in the embodiment of the present invention, the clamp circuit and the sampling circuit of the focus signal extracting unit according to the present invention can sample and implement only the effective screen interval. In an embodiment of the present invention, it is more preferable that the sampling operation is continuously repeated during an effective video interval during one field period to extract a necessary signal.

8A is a graph illustrating a block diagram of a high-pass filter forming a focus signal forming unit in the system block of the present invention. FIG. 8B is an image of FIG. 8B showing the result of filtering using the signal sampled in FIG. 7C. FIG. 8B is an enlarged view of the dotted line circle in FIG. 8B. As described above, the high-pass filter sets the focus-related signal to a cutoff frequency exceeding a specific reference value, and can calculate the focus value using the signal passed through the cutoff frequency. That is, when the focal point of the analog video signal is correctly matched, the high frequency components are increased. At this time, only the specific frequency band (range) is amplified and the signal is amplified to raise the level of the high frequency components . If the input image is in a defocused state, the frequency of (c) in FIG. 8B is lowered.

A signal obtained through the high frequency band amplification is passed through a high frequency filter to cut off a low frequency band irrelevant to a focus value and only signals of a high frequency band closely related to the focus value are input to the integrator.

FIG. 9A is a diagram illustrating a block passing through the integrator, and FIG. 9B shows a waveform of a signal obtained by calculating a signal passed through a high-pass filter through an integrator in FIG. 8B. 9C is an enlarged view of the portion of the dotted circle in Fig. 9B. More specifically, FIG. 9B shows a result obtained by integrating in a cycle of a horizontal synchronizing signal (Hsync), and then passes the integrated signal through a rectifying circuit to output a DC voltage in units of a horizontal synchronizing signal (Hsync). At this time, the output voltage passes through the Pick & Hold circuit as described above. In this case, in the peak-and-hold circuit, the highest value of the DC voltage output during the effective video period during one field period is read, It is reflected as a focus value. It is preferable to read the focus value DCized before one field ends and the two fields start, and then clear the peak-and-hold circuit. For example, if 1volt is output as the maximum value by the DC voltage during the effective video interval during the 1-field period, the maximum value is kept at 1volt, and 1volt is read at the end of one field, This value is cleared before the 2 field starts. It is preferable that such a process implements a peak-and-hold operation in units of a horizontal synchronizing signal (Hync) and a clearing operation of a peak-and-hold circuit in a vertical synchronizing signal (Vsync) period. 9D is an image showing the final focus value of the section of the vertical synchronization signal (Vsync).

FIG. 9E is a graph for explaining a concept of implementing a peak-and-hold operation in units of a horizontal synchronizing signal (Hync). In parallel with the peak-and-hold operation, the low-pass filter (LPF) removes unwanted noise and plays back the correct analog waveform, passing through the Pick & Hold block.

10 shows an enlarged view of a part of one vertical synchronizing signal (Vsync). In the case of the National Television System Committee (NTSC) method, 242 pieces of PAL (Phase Alternation Line) Method includes 292 or more horizontal sync signals (Hsync), and the above operation is repeatedly performed on a field-by-field basis.

FIG. 12 illustrates a system operation sequence of a focus alignment indicator according to an embodiment of the present invention.

Referring to FIG. 12, the system operation of the focus alignment indicator according to the embodiment of the present invention checks whether a vertical synchronization signal interrupt (Vsync interrupt) is applied to a first input video signal, . Then, the AD value (digitized focus value) is read, and the maximum value (AD value of Mac Buffer) stored in the buffer memory unit is compared with the currently read focus value (AD value).

That is, the display unit displays each value in contrast to the digitized focus value stored as the maximum value and the digitized focus value (the AD value stored in the live buffer) which is input at present, and simultaneously displays the difference of each value do. In addition, it can be driven to output the difference and the value by voice in conjunction with the voice synthesizer.

That is, the focus alignment indicator according to the embodiment of the present invention analyzes the input image to numerically display the degree of focus, and in particular, displays the maximum value among the measured focus values separately so that the operator can easily recognize the maximum value as the target value . That is, although the focus values obtained according to the type of the subject and the screen state are different from each other, the efficiency of the operator is increased by switching the display value to a value that is familiar to the user, and further, So that the convenience of the user can be increased by informing the user by voice or by voice synthesis.

The term " part " used in the various configurations according to the present invention means hardware components such as software or FPGA or ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and components may be further combined with a smaller number of components and components or further components and components. In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong.

Therefore, it should be understood that the present invention is not limited to these combinations and modifications. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

110: Video signal input unit
120: Focus signal extracting unit
130: Focus information signal forming section
140: Focus information signal quantization unit
150: Focus information display part
160: Buffer memory section
170:
180:

Claims (10)

A video signal input unit for receiving a video signal photographed through a camera;
A focus signal extracting unit for extracting a focus related signal from the image signal;
A focus information signal forming unit for filtering and correcting the focus related signal to form a pure focus information signal that can be quantized; And
A focus information display unit for displaying the focus information signal; , ≪ / RTI &

Wherein the focus signal extracting unit comprises:
A clamp circuit for clamping an analog video signal;
A sampling circuit for extracting a focus related signal including a luminance signal from the clamped video signal; And
A signal amplifier for amplifying the focus related signal extracted from the sampling circuit; Lt; / RTI >

Wherein the focus information signal forming unit comprises:
A high-pass filter for filtering the low-frequency component of the focus-related signal and rearranging the low-frequency component to a high-frequency component related to the focus value;
An integrator for integrating the focus related signal to output a representative value;
A data quantizer for quantizing the signal integrated in the integrator;
A rectifying circuit for rectifying the focus-related signal passed through the integrator and outputting a DC voltage in units of a horizontal synchronizing signal (Hsync);
A low pass filter for removing unnecessary noise of the focus related signal passed through the rectifying circuit; And
A peak & hold circuit for reflecting the DC output voltage through the rectifying circuit to a real time focus value for a maximum value of one field; Wherein the focus indicator comprises a focus indicator.
delete delete delete The method according to claim 1,
Wherein the focus information signal forming unit comprises:
A focus information signal quantization unit for quantizing the quantized focus information signal by synchronizing with the field period of the video signal;
And a focus indicator.
The method of claim 5,
Wherein the focus information signal quantization unit comprises:
A buffer memory unit for storing a maximum value of the digitized focus information signal;
A numerical comparison unit for comparing a maximum value stored in the buffer memory unit with a currently input value;
And a focus indicator.
The method of claim 6,
Wherein the focus information display unit displays,
Based on the numerical focus value acquired by the focus information signal quantization section,
And displays a real-time focus value that is input in real time and a maximum focus value that is a memorized target focus value.
The method of claim 7,
Wherein the focus information display unit displays,
A voice signal forming unit for inputting the digitized focus value obtained by the focus information signal digitizing unit to the voice synthesizer and outputting the maximum value and the numerical value of the newly inputted focus value by voice;
And a focus indicator.
The method of claim 8,
Wherein the voice signal forming unit comprises:
A frequency modulation signal forming unit for inputting the obtained numerical focus value into an audio synthesizing apparatus to generate a frequency modulated signal proportional to a value acquired in an audible frequency band;
An audio output unit for outputting audio by comparing the input numerical focus value with a maximum value of the stored focus information signal;
And a focus indicator.
An unmanned camera system comprising the focus indicator of claim 1.

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