KR100285893B1 - Screen division display device using scanning line conversion function - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split screen display apparatus using a scanning line converting method, wherein a screen divided by the scanning line converting method can be viewed on a computer monitor as well as a general TV monitor.

According to the present invention, when an analog video signal is inputted to a first video decoder, the input analog video signal is processed into a digital video signal of a predetermined type, recorded and stored in the first memory means, and then the analog video signal is again transmitted through the first video encoder. After converting the digital video signal to a general TV monitor, the second video decoder receives the analog video signal from the first video encoder under the control of the microcontroller. Recording and storing in the second memory means, wherein the video signal data recorded and stored in the second memory means is read out twice as fast as the recording speed of the image scanning line, converted into scanning lines, and then converted into analog RGB through the second video encoder. Computer monitor converted to signal By having the output it is possible to output video signals through the various image output device can maximize the utilization of the video output device.

Description

Screen division display device using scanning line conversion function

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen split display device. In particular, four video signals inputted from four video cameras in a surveillance system can be displayed on a general TV monitor and a computer monitor using a scanning line conversion function. A screen division display apparatus using a conversion function.

FIG. 1 is a block diagram illustrating an entire system of a four screen divider 100, which is a kind of a general screen divider.

First, when analog video signals NTSC, PAL, and SECAM captured by an image capturing medium such as a video camera are input to the video decoders 101, 102, 103 and 104, the video decoder converts the input analog video signal into a digital video signal of a predetermined type. Let's go.

In this case, three A / D converters are built into the video decoders 101, 102, 103, and 104, and the input analog video signal is converted into a digital video signal, and then converted into a digital video signal. It will be in the form of digital data.

Further, the video decoders 101, 102, 103 and 104 send digital video signals converted to the canonical video format to respective memories, and on the other hand, the digital video signals and vertical / horizontal sync signal data of the predetermined type produced by the video decoders 101, 102, 103 and 104 are stored in the memory. To the controller 106.

The memory controller 106 receiving the above-described information from the video decoder controls each of the memories 107, 108, 109 and 110 to record the video data in the memories 107, 108, 109 and 110.

That is, the video data output from each of the video decoders 101, 102, 103, and 104 by the recording control signal of the memory controller 106 is recorded and stored in the memory 107, 108, 109, 110. In this case, the video data recorded in the memories 107, 108, 109, and 110 is a portion corresponding to a part of the video screen data.

In addition, the memory controller 106 sends a memory read control signal to each of the memories 107, 108, 109 and 110, and accordingly reads to the video encoder 111 in synchronization with the control signal of the memory controller 106 from the respective memories 107, 108, 109 and 110. Digital video data is sent.

In this case, the video decoders 101, 102, 103, 104 and the video encoder 111 are controlled by the microcontroller 105.

As such, the digital video data input to the video encoder 111 is converted into an analog video signal through a digital signal processor and a D / A converter built in the video encoder 111, and the converted signal is output to the TV monitor 112. Will be.

2 shows a system block diagram 200 of a typical scanning line converter.

The microcontroller 203 shown in FIG. 2 applies a control signal for changing the video format of the input video decoder 201 to the video decoder 201 to designate the data type of the video encoder 205 to specify the data type. To convert.

Looking at the signal processing of the scan line converter 200 in more detail as follows.

That is, when an analog video signal is input from the video camera to the video decoder 201, the video decoder 201 receives an analog video signal and uses an internal A / D converter and a digital signal processor to convert a digital video signal of a predetermined type. Make it up

In this case, the digital video signal generated by the video decoder 201 is recorded and stored in the memory 204, and the digital video format and horizontal / vertical sync signal information are applied to the memory controller 202.

In particular, the memory 204 is a memory capable of storing one image scanning line, and is a memory device capable of operating an input signal and an output signal asynchronously.

In addition, the memory controller 202 is designed to generate the input signal and output signal of the image scan line memory and the synchronization signal of the monitor 206 at once.

The video encoder 205, which receives the video signal data from each of the memories 204, converts the input digital video signal into a digital RGB signal by an internal digital conversion circuit.

The digital RGB signal thus input is converted into an analog RGB signal through a D / A converter inside the video encoder 205.

In addition, when the analog RGB signal converted through the video encoder 205 and the horizontal and vertical synchronization signals generated by the memory controller 202 are transmitted to the TV monitor 206, the video signal is scanned to the TV monitor 206. Is output.

On the other hand, the four-screen split display as described above is already disclosed in Korean Patent Publication No. 2825 (Patent Publication No. 92-5058), the contents are as follows.

That is, the disclosed invention as shown in FIG. 3 is characterized in that the Y / C separator 1 and the Y / C separator 1 for separating the luminance signal Y and the color difference signals RY and BY from the video signal. A selector 2 for selecting an output signal, an A / D converter 3 for converting an analog signal selected by the selector 2 into a digital signal, and a digital video signal output from the A / D converter A control unit 5 for recording / decoding to (4), a latch unit 6 for temporarily holding the output signal of the control unit 5, a synchronous separator 7 for separating horizontal and vertical synchronization of the video signal; And a plurality of D / A converters (8, 9, 10) for converting digital luminance signals and color difference signals output from the latch unit (6) into analog signals, and the plurality of D / A converters (8, 9, 10) an encoder 11 for converting the luminance signal Y and the color difference signals RY and BY into a composite video signal, and a color burst signal and a blanking signal. And the like to generate a synchronization generator 12 for applying to the encoder 11, an on-screen generator 13 and 13 'for displaying characters on the screen, and a year, month, day, day of the week, time, and seconds. A timer 14 for controlling the unit, a microcomputer 15 for controlling each unit, a clock generator 16 for generating a clock signal to the microcomputer 15, and various information on the current state in preparation for power failure. An EEPROM 17 for storing, a line buffer 18 for signal interface with a computer, an analog switching unit 19 for arbitrarily selecting four signals input from a camera, and the on-screen generator 13 ' And a video signal synthesizing unit 20 for synthesizing the video signal output from the analog switching unit 19 and displaying it as a character, and amplifying the video signal output from the video signal synthesizing unit 20 to an output terminal. Interconnect buffers 23 to monitors, TV receivers, VCRs, etc. It is open configuration.

According to the above device, in the monitoring system installed in department stores or jewelry stores, the video input from four cameras can be divided and displayed on one monitor screen at the same time, so that the monitoring task can be performed more efficiently.

Recently, computer monitors have been popularized with the spread of personal computers, and in order to use these computer monitors efficiently, the necessity of making the output video signal of the screen splitter compatible with the computer monitor has emerged.

However, since the conventional screen split display device scans an output video signal in an interlace method, it cannot be compatible with a video output device employing a noninterlace method.

That is, the conventional screen splitting system can output the video output signal from the output terminal of the screen splitter only to a general TV monitor of interlace method, and is compatible with a computer monitor employing the noninterlace method. There was a problem that the TV monitor must be used as the screen display because it cannot be output.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by using the scanning line conversion function, the video output device can be used by outputting the composite video output signal of the four-screen splitter to a computer monitor as well as a general TV monitor. An object of the present invention is to provide a screen split display using a scanning line conversion function to maximize efficiency.

As a technical idea for achieving the object of the present invention, a video decoder for receiving an analog video signal and converting it into a digital signal of a predetermined type, memory means for receiving and storing a synchronized digital video signal from the video decoder, and the memory A video splitter comprising: a video encoder for receiving a digital video signal read out from a means, converting the same into an analog RGB signal, and outputting the analog video signal to a TV monitor; and a system control means for controlling the video decoder and the video encoder. Memory control means for controlling the memory means by receiving horizontal and vertical synchronization signal information of a video signal from a digital signal; and receiving an analog video signal from a video encoder controlled by the system control means, and then again receiving a digital video of a predetermined form. A second video decoder which converts the call to a vertical and horizontal sync signal and outputs the same together with the vertical and horizontal sync signals, second memory means for receiving and storing a digital video signal of a predetermined type from the second video decoder, and a sync signal sent from the memory control means. And a second video encoder which receives the digital video signal read out from the second memory means, converts the analog video signal into an analog video signal, and outputs the analog video signal to a computer monitor.

According to an embodiment of the present invention, the video signal data recorded and stored in the second memory means is read out twice as fast as the recording speed of the image scanning line, and the scanning line is converted by the control of the memory control means and then output to the computer monitor through the second video encoder. Presented.

1 is a block diagram of a general screen divider.

2 is a block diagram of a typical scan line converter.

3 is a block diagram illustrating a four-screen split display according to the related art.

4 is a block diagram illustrating a screen division display apparatus using the scan line conversion function according to the present invention.

<Explanation of symbols for main parts of drawing>

301,302,303,304,313: first video decoder 305: tuner

306: microcontroller 307: memory controller

308,309,310,311,314: first memory means 312: first video encoder

313: second video encoder 314: second memory means

316: video switch 317: TV monitor

318: Computer Monitor

Hereinafter, with reference to the accompanying drawings, the configuration and operation of an embodiment for achieving the above object will be described.

4 is a block diagram showing the configuration of the screen split display device 300 using the scanning line conversion function according to the present invention.

Referring to FIG. 4, the present invention receives four analog video signals inputted from four video cameras, respectively, and converts them into a digital video signal of a predetermined type, and then separates them into vertical and horizontal syncs (301, 302, 303, 304). And a memory controller 307 for controlling input and output signals of memory means by receiving standardized frequency, data rate, horizontal and vertical synchronization signals generated by the first video decoders 301, 302, 303 and 304, and the memory controller 307. First memory means (308, 309, 310, 311) for recording and storing data applied from the first video decoders (301, 302, 303, 304) under the control of the control unit, and reading from the first memory means (308, 309, 310, 311) under the control of the memory controller (307). A first video encoder (312) for signal-processing the converted digital video signal into an analog RGB signal; The TV monitor 317 outputs the analog RGB signal output from the first video encoder 312, and the second video decoder converts the analog video signal sent from the first video encoder 312 back into a digital video signal of a predetermined type. 313 and a second storing the converted scan line data under the control of the memory controller 307 which receives the normalized frequency, data rate, and vertical / horizontal synchronization signal of the video signal from the second video decoder 313. A second means for receiving data read out from the memory means 314 and the second memory means 314 at twice the recording speed, converting a digital video signal of a predetermined type into a digital RGB signal, and converting it back into an analog RGB signal; A video encoder 315 and an analog RGB signal output from the second video encoder 315 are output as an image by the converted output scan line. It consists of a computer monitor 318.

Referring to the operation of the present invention configured as described above in detail.

The present invention will be described with reference to the system block diagram 300 illustrated in FIG. 4.

4 is a four-screen split display as an embodiment of the multi-screen split display according to the present invention, but if designed in the same form, up to 16 splits are possible.

The four-screen split display according to the present invention is mainly applied to a surveillance system, and the signal processing is as follows.

First, when four analog video signals are input from the four video cameras to the first video decoders 301, 302, 303 and 304, respectively, the first video decoders 301, 302, 303 and 304 respectively receive the video signals input by the control of the microcontroller 306. It is initialized to output as a digital video signal of a certain type.

That is, the analog video signals inputted to the first video decoders 301, 302, 303, and 304 are sampled at 27 MHz sampling frequency within the respective video decoders 301, 302, 303, and 304, and each video signal is vertically divided through a sync separation circuit provided therein. It is made of horizontal synchronization signal.

The sampled data is made of a digital video signal of a certain type and output from the first video decoders 301, 302, 303 and 304.

The output digital video signal form of the video decoders 301, 302, 303 and 304 used in the present invention is 4: 2: 2 form which is a standard video format (YUV).

Meanwhile, the vertical and horizontal synchronization signals of the analog video signals inputted to the first video decoders 301, 302, 303, and 304 differ depending on broadcast signal types such as PAL, NTSC, and SECAM.

For example, assuming that an NTSC broadcast signal is input to the first video decoders 301, 302, 303, and 304, it is designed to have 30 frames per second, 480 scan lines per frame, and 720 sampled pixels per scan line.

In addition, the analog video signal input to the first video decoders 301, 302, 303, and 304 is sampled with 16 bits of quantization number of one pixel per scan line, and the output data is output at a signal rate of 13.5 MHz.

In addition, the first video decoder 301, 302, 303, 304 sends the vertical and horizontal synchronous signal information of the digital video signal to the memory controller 307, and thus the 13.5 MHz synchronous clock and horizontal and vertical signals provided from the memory controller 307. The digital video data applied from the first video decoders 301, 302, 303 and 304 is recorded and stored in the first memory means 308, 309, 310 and 311 according to the synchronization signal and the field signal.

In addition, when the output data of the first video decoders 301, 302, 303, 304 is recorded and stored in the first memory means 308, 309, 310, 311 under the control of the memory controller 307, one quarter of the amount of one screen data is output when outputting a 4-split screen. As long as the record is saved.

In order to configure the divided and stored screen amount of data, output data of the first video decoders 301, 302, 303, and 304 are stored in the first memory means 308, 309, 310, and 311 as one screen, respectively.

In general, since only one field is used, the movement is often unnatural when the screen is monitored. However, in the present invention, this problem has been improved. That is, when the microcontroller 306 records and stores data in the first memory means 308, 309, 310, and 311, one screen for viewing in real time when viewing the screen with the TV monitor 317 is described. The memory write signal is generated by recording both fields in the frame of.

In addition, the first memory means (308, 309, 310, 311) to asynchronously process the input and output data using a frame memory of the FIFO method.

A read control signal for accurately reading digital video data recorded according to the above recording method is provided from the memory controller 307. The read control signal is determined by the vertical and horizontal synchronizing signals of the recorded video signal.

That is, the first memory means 308, 309, 310, 311 reads the video data by the read control signal provided from the memory controller 307.

On the other hand, when reading the video data of the first memory means (308, 309, 310, 311) to display a plurality of input screens on one screen, it is necessary to read out to output the data input to the first memory means (308, 309, 310, 311) at once.

At this time, the memory controller 307 should find the correct position when switching from one screen to another screen from the screen displayed on the actual screen through the control signal to switch to the other screen, so as not to be too late when reading data You need to make the transition very fast.

When the read video data is sent to the first video encoder 312, the first video encoder 312 processes an analog signal and outputs an analog video signal through a D / A converter provided therein. The analog video signal thus output is output to the TV monitor 317 via the video switch 316 by the user's selection.

However, at this stage, the vertical and horizontal synchronizing frequencies output from the first video encoder 312 are displayed only on an interlace type regular TV monitor and are compatible with other noninterlace type display devices. Could not be displayed.

Therefore, in the present invention, the four-segment screen can be viewed on another monitor, in particular, a computer monitor of a sequential scanning method by using the following scanning line conversion method.

Looking at the process using the scanning line conversion method according to the present invention in Figure 4 as follows.

That is, when the analog video signal from the first video encoder 312 passes through the second video decoder 313, various types of digital video outputs can be produced. The scan line conversion can be performed by using the digital video output signal in various ways. However, in the present invention, the scan line is converted by using the copying method of the scan line.

Here, the method of copying a scan line refers to a method of reading the data of one scan line twice. In order to read the scan lines twice, a memory control signal must be generated with the output control signal of the video decoder 313.

That is, when the memory image data stored in each of the second memory means 314 is read out twice as fast as the recording speed of the image scanning line under the control of the memory controller 202, the scanning line can be converted. That is, the scanning speed of the scanning line is doubled, and the video data stored in the second memory means 314 is read out twice as fast.

At this time, the memory controller 307 receives the sampling frequency, data rate, vertical and horizontal synchronization signals of the video decoder 313 and controls the input and output of the second memory means 314.

That is, when the video data is recorded in the second memory means 314 according to the control signal of the memory controller 307, it has a 13.5 MHz synchronous clock, and when the data is read out from the second memory means synchronous clock of 27 MHz. Will have

In addition, the input signal of the second memory means 314 is recorded and stored in accordance with the vertical and horizontal synchronization signals of the video decoder 313, and the output signal of the second memory means 314 is twice the output data rate. A new vertical and horizontal synchronization signal synchronized with the sampling frequency and sampling frequency is created and scanned on the screen to be displayed. In this case, the vertical synchronization signal is 60 kHz, and the horizontal synchronization signal is 31.5 KHz, which is twice the 15.75 KHz.

That is, when the data read from the second memory 314 at twice the data writing speed is inserted into the second video encoder 315, the digital video signal conversion circuit provided in the second video encoder 315 is provided. The digital video signal is converted into a digital RGB signal, and the converted video signal is converted into an analog RGB signal through a D / A converter.

When the analog RGB signal is sent to the computer monitor 318 together with the vertical and horizontal synchronizing signals sent from the memory controller 307, the output scan line of the second video encoder 312 is converted and scanned, thereby being divided into four parts by the computer monitor 318. Watch the video screen.

Meanwhile, as shown in FIG. 4, when a TV broadcast signal or a satellite broadcast signal is received by the tuner 305 and input to the first video decoders 301, 302, 303 and 304, the screen divided by the control of the microcontroller 306 is displayed on the TV monitor. 317 or computer monitor 318.

In addition, the video signal of the channel tuned by the tuner 305 can be viewed by the TV broadcast signal receiving system using the video switch 316. In this case, the audio signal of the channel tuned by the tuner 305 can be viewed as a speaker. It can also be connected to the TV receiver to output.

In addition, when the broadcast video signal received by the tuning 305 is digitally processed and then output to the TV monitor 317 or the computer monitor 318 via the first and second video encoders 312 and 315, the video signal is divided. Output to any position on the screen.

As described above, the screen splitting display device according to the present invention can be used for various purposes, and in processing the split screen, the screen can be processed by hardware rather than the screen by software. .

As described above, when the video signal photographed by the video camera is input to the first video decoders 304, 303, 302 and 301, the analog video signal input from the first video decoders 304, 303, 302 and 301 is converted into a digital video signal of a predetermined type. The digital video data processed and signal-processed are recorded and stored in the first memory means 308, 309, 310 and 311, and then converted into analog video signals through the first video encoder 312 and then output to a general TV monitor. The second video decoder 313, which receives the analog video signal from the first video encoder 312 under the control of 306, converts the analog video signal back into a digital video signal of a predetermined type, and then the second memory means 314. Is stored in the second memory means under control of the memory controller 307. The video signal data recorded and stored at 314 are read out twice as fast as the recording speed of the image scanning line, are converted into scanning lines, and then converted into analog RGB signals through the second video encoder 315 to be output to the computer monitor 318. Various video output devices can simultaneously output video signals to maximize the utilization of the video output devices.

In addition, according to the present invention, since the TV can be received using the tuner 305, the tuner output broadcasting screen can also be viewed by the TV monitor 317 or the computer monitor 318 at any position of the divided screen. have.

Claims (4)

A first video decoder for receiving an analog video signal and converting it into a digital signal of a predetermined type; first memory means for receiving and storing a synchronized digital video signal from the first video decoder; and reading from the first memory means. A four-screen display device comprising a first video encoder receiving a digital video signal, converting the same into an analog RGB signal, and outputting the same to a TV monitor, and system control means for controlling the first video decoder and the first video encoder. Memory control means for receiving horizontal and vertical synchronization signal information of a video signal from the video decoder to control the memory means; A second video decoder receiving an analog video signal from a video encoder under the control of the system control unit, converting the analog video signal into a digital video signal of a predetermined type, and outputting the same together with the vertical and horizontal synchronization signals; Second memory means for receiving and storing a digital video signal of a predetermined type from the second video decoder; A second video encoder configured to receive a digital video signal read out from the second memory means according to a synchronization signal sent from the memory control means, convert the digital video signal into an analog video signal, and output the same to a computer monitor; Under the control of the memory control means, the video signal data recorded and stored in the second memory means is read out twice as fast as the recording speed of the image scanning line, converted into scanning lines, and then output to the computer monitor through the second video encoder. A screen split display using the scanning line conversion function. The method of claim 1, wherein the memory control means receives the sampling frequency, data rate, vertical and horizontal synchronization signals of the video signal input from the second video decoder to control the input and output of the second memory means Screen division display using scanning line conversion function. The memory control unit of claim 1, wherein the memory control unit controls the two fields to be entered without using only one portion of the field in one frame when generating a read control signal of the memory unit to improve real time when viewing a split screen. And a screen division display apparatus using a scanning line converting function. The scanning line conversion according to claim 1, wherein the broadcast video signal received by the tuning means is output to an arbitrary position of a split screen when the digital video signal is output to a TV monitor or a computer monitor via the video encoder. Screen display using the function.