KR100198542B1 - Image signal generating device and method - Google Patents

Abstract

The video signal generator and its method are proposed to encode and transmit a normal picture and a slow picture simultaneously using a separate recording device.

Since the generation of the dual screen according to the prior art generates a dual screen at the receiving device by receiving the video signal transmitted from the transmitting device, the dual screen generator should be built in the receiver, and the problem of the deterioration of the image quality is generated from the video camera. Converts the transmitted signal into a signal for the normal video screen, records the signal for the normal video screen according to the control signal, and shifts and reproduces it, and interpolates the signal for the normal video screen and the signal for the shifted / played screen according to the control signal. And by decimating and outputting the double-screened screen information, and then modulated and transmitted, there is an advantage that can enjoy the normal screen and slow motion with a good picture even in the receiver without a dual screen generator.

Description

Image signal generator and its method

The present invention relates to a video signal generator and method for encoding and transmitting a normal picture and a slow picture simultaneously using a separate recording device.

In general, a transmitter for transmitting a video signal includes a luminance and color signal converter 10, a timing inserter 20, a low pass filter 30, and a color signal modulator (shown in FIG. 1). 40, an adder 50, and a transmitter 60.

A general transmission device configured as described above has a luminance signal Y and a color signal suitable for signal processing when R (Red), G (Green) and B (Blue) signals are input from the camera to the luminance and color signal conversion number 10. By switching to U and V, the luminance signal Y is input to the timing insertion section 20, and the color difference signals U and V are input to the low pass filter section 30.

The timing inserter 20 inserts and outputs various reference signals such as horizontal and vertical synchronization signals and pedestal levels into the input Y signal.

The low pass filter 30 modulates and outputs the input U and V signals.

The adder 50 adds the output signal of the timing inserter 20 and the signal modulated by the low pass filter unit 30 to output to the transmitter 60, which transmits the amplitude added by the adder 50 to the amplitude. Modulate and transmit.

The receiving apparatus for generating a dual screen by receiving the video signal transmitted from the transmitting apparatus will now be described.

2 is a block diagram illustrating a receiving apparatus for generating a dual screen according to the prior art, the left screen generating unit 100 for generating the left screen of the screen, and the right screen generating unit for generating the right screen of the screen ( 200, and a signal selector 300 for carrying two screens in one horizontal and vertical signal.

Here, the left screen generator 100 and the right screen generator 200 are a tuner and an image amplifier 101, 201, a clock generator 102, 202, and an A / D converter 103, respectively. 203, luminance and color signal separators 104 and 204, color signal demodulators 105 and 205, and vertical and horizontal magnitude attenuators 106 and 206.

The tuner and the image amplifiers 101 and 201 of the receiver for generating the dual screen according to the prior art configured as described above receive different channels and output the composite video signals CV1 and CV2.

Different composite video signals are inputted to the A / D converters 103 and 203, respectively, and converted into digital signals. The converted digital signals are inputted to the luminance and color signal separators 104 and 204, respectively. The signal Y and the color signal C are separated.

The color signals are demodulated to U / V in the color signal demodulators 105 and 205, respectively, and the vertical and horizontal magnitude attenuators 106 ( 206).

Then, the signal size Y1, U1, V1 (Y2, U2, V2) of which the size is horizontally reduced in half and the size is reduced by about 3/4 in the vertical direction is generated with the left screen generator 100 and the right screen. Each output from the unit 200.

In this case, the reference clocks used in the left screen generator 100 and the right screen generator 200 use clocks synchronized with the output signals of the tuner and the image amplifiers 102 and 201. It receives from 202 and uses it.

In particular, since the input signals of the left and right screens are different from each other, the synchronization signals are not equal to each other.

In this case, the horizontal and vertical synchronization signals output from the clock generator 102 of the left screen generator 100 are used as a reference signal.

As a result, the signals of the magnitudes Y1, U1, and V1 that are horizontally reduced in half and the size reduced by about 3/4 in the vertical direction are output from the left screen generator 100 and the right screen generator 200, respectively. Y2, U2, and V2 are simultaneously input to the signal selector 300, respectively.

At this time, since the signal selector 300 is controlled by a control signal that is half of the normal horizontal synchronization signal output from the clock generator 102, a signal capable of sending two screens to one horizontal and vertical signal (DWY, DWU, DWV) Outputs

In the generation of the dual screen according to the prior art, since a dual screen is generated in the receiving apparatus by receiving the video signal transmitted from the transmitting apparatus, a problem of deterioration of image quality occurs.

In addition, since the receiver needs to make a dual screen, if a viewer wants to watch a dual screen, a problem arises in that a receiver with a dual screen generator must be purchased.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a video signal generating apparatus and method for transmitting a double screen of a normal screen and a slow screen are made on the transmitting side.

1 is a block diagram of a transmitter for transmitting a general video signal.

2 is a block diagram illustrating a receiving apparatus for generating a dual screen according to the prior art.

3 is a block diagram for explaining a configuration of a video signal generator for transmitting dual screen generation according to the present invention.

4 is a view for explaining the horizontal decimation of the dual-screen generating unit according to the present invention.

5 is a view for explaining the vertical decimation of the dual-screen generating unit according to the present invention.

Figure 6a is a view showing a double screen when not doing a vertical conversion according to the present invention.

Figure 6b is a view showing a double screen when the vertical conversion reduced by 3/4 according to the present invention.

Figure 6c is a view showing a double screen when the vertical conversion is reduced by 2/3 in accordance with the present invention.

7 is a flowchart for explaining a video signal generation method for transmitting a dual screen video signal including a slow screen according to the present invention.

* Explanation of symbols for main parts of the drawings

310, 320, 330: gamma correction unit 340: signal conversion unit

350,360: LPF 370: recording and playback unit

380: switch 390: dual screen generation unit

400,430,440: Multipliers 410,460: DAC

420: SIN / COS modulator 450,470: adder

An apparatus and method for generating a video signal according to the present invention are characterized by encoding and transmitting a normal screen and a slow screen at the same time by having a recording / playback section and a dual screen generation section on the transmitting side.

Hereinafter, an image signal generating apparatus and a method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram illustrating the configuration of an image signal generator for transmitting dual-screen generation according to the present invention, wherein R (Red), G (Green), and B (Blue) signals transmitted from a video camera are respectively. First, second, and third gamma correction units 310, 320, and 330 that input and perform gamma correction for faithful color reproduction, and first, second, and third gamma correction units 310, 320 A signal converter 340 for converting the R, G, and B signals corrected in step 330 into luminance signals (Y) and color signals (U / I, V / Q) of digital signals suitable for signal processing; And first and second low pass filters (LPF) units 350 and 360 which respectively receive U / I and V / Q output from the signal converter 340 and remove high frequencies of 1.3 MHz or more. The Y signal output from the signal converter 340 and the U / I and V / Q signals output from the first and second LPFs 350 and 360 are recorded and reproduced in slow motion according to an external dual screen control signal. Recording and reproducing section 370, External dual screen control by incorporating a switch 380 for controlling the output of the recording / playback unit 370 by turning on / off according to the dual screen control signal, and a sample memory (not shown) and a line memory (not shown). The Y signal output from the signal conversion converter 340 and the U / I and V / Q signals output from the first and second LPFs 350 and 360 according to the signal and the switch 380 on and off and the recording / reproducing The unit 370 processes the signal reproduced by shifting and interpolates and decimates the signal according to one frequency bandwidth, thereby dualizing the luminance signal DWY and the dual screen color signal DWU / I (DWV / Q). A dual screen generator 390 for outputting a multiplexer, a first multiplier 400 for multiplexing and outputting a synchronization signal, a pedestal and a timing signal of a normal screen, and a dual screen luminance signal output from the dual screen generator 390; Convert the output signal of the first multiplier 400 to an analog signal to convert the analog double screen luminance signal The first DAC (Digital / Analog Converter) 410 outputs, the SIN / COS modulator 420 for modulating and outputting the sine (SIN) and cosine (COS) components, and the dual screen generator 390 Second and third multipliers 430 and 440 for multiplexing the dual-screen color signal and the SIN / COS components output from the SIN / COS modulator 420 and outputting the second and third multipliers 430 and 440, respectively. An adder 450 for adding and outputting the second output, a second DAC 460 for converting the output of the adder 450 into an analog signal and outputting an analog dual screen color signal, and an analog dual screen luminance signal of the first DAC 410. And a second adder 470 that outputs a composite video broadcast signal (CVBS) by adding an analog dual screen color signal of the second DAC 460.

The operation of the image signal generator according to the present invention configured as described above will be described in detail with reference to the flowchart of FIG. 7. First, the first, second, and third gamma correction units 310, 320, and 330 are operated from the video camera. Compensation for the non-linear component between the write value and the signal value of the transmitted R, G, B signal (S71).

The compensated R, G, and B signals are converted by the signal converter 340 into luminance signals Y and color signals U / I and V / Q, which are digital signals suitable for signal processing (S72).

In this case, the luminance signal Y is directly input to the dual screen generator 390, and the color signals U / I and V / Q are respectively filtered by 1.3 MHz in the first and second LPFs 350 and 360, respectively. It is input to the screen generator 390 (S73).

Meanwhile, the luminance signal Y output from the signal converter 340 and the color signals U / I and V / Q respectively output from the first and second LPFs 350 and 360 are transmitted to the recording / reproducing unit 370. It is input and recorded (S74).

The dual screen generating unit 390 is a switch 380 is on (S75), when the dual screen control signal is on, the slow video motion output from the recording and playback unit 370 is selected to process a normal video screen and a slow screen at the same time In operation S76, the horizontal / vertical synchronization signals have the same synchronization signal because they are the same broadcast screen.

First, in order to make a dual screen in the dual screen generator 390, the luminance signal Y output from the signal converter 340 corresponding to one line and the first and second LPFs 350 and 360 are respectively output. The color signals (U / I, V / Q) are stored and read in the sample memory in sample units.

When writing to the line memory, the averaged sample is stored by averaging two sample units of one horizontal line stored in the sample memory as shown in FIG.

In addition, in response to the dual screen control signal, the recording / reproducing unit 370 reproduces and outputs the recorded normal screen to the dual screen generating unit 390 in slow video motion.

Information of one line of the slow video motion input to the dual screen generator 390 is stored and read in the sample memory on a sample basis.

When writing to the line memory, the averaged samples are stored by averaging two sample units of one horizontal line stored in the sample memory as described above.

Therefore, in order to create a dual screen, the dual screen generation unit 390 reads the data alternately by 1/2 cycle of the horizontal frequency when reading the line memory.

In this case, when the sample memory of the dual screen generator 390 is read and written to the line memory, the sample data may be filtered by one space without storing the average of two sample data stored in the sample memory.

However, if you decimate only horizontally to change the dual screen to one screen, it appears to be extended vertically, so that the left and right screens are reduced to a suitable screen size.

The conversion to the vertical direction can be selected by the control signal of the dual screen generator 390. If the conversion to the vertical direction is not desired, 625 lines are encoded in the PAL method, so the entire 625 lines are encoded as shown in FIG. Make dual screen one screen.

In addition, if the conversion to the vertical direction is selected, as shown in FIG. 5, the field memory is used to reduce the vertical direction while subtracting one of the four lines. That is, in the PAL method, since 625 lines are converted to about 469 lines and encoded, the dual screen as shown in FIG.

If one side of the three lines is reduced to the vertical direction, the image is reduced by 2/3. In the PAL method, the image is converted from about 625 lines to about 417 lines, and then encoded.

That is, the dual screen generator 390 may output only a normal screen according to the state of the switch 380 (S77), and process two video information according to one frequency bandwidth by simultaneously processing a normal screen and a slow screen. You can print in dual screen.

When the dual screen output is selected, the dual screen generator 390 selects a luminance signal (Double Window Y: DWY) for the dual screen and a color signal for the dual screen (Double Window U / I: DWU / I, Double Window V / Q: DWV / Q) is output (S78).

The luminance signal of the output dual screen is modulated by the first multiplier 400 together with the synchronization signal and the timing signal, and then input to the first DAC 410 to output the luminance signal for the analog double screen (Analog Double Window Y: ADWY). Is converted to.

In addition, the color signal for the output dual screen is modulated by the SIN / COS component and the second and third multipliers 430 and 440 output from the SIN / COS modulator 420, respectively, and then the second and third multipliers 430. The signal modulated in step 440 is combined by the first adder 450 and input to the second DAC 460 to convert and output the color signal (Analog Double Window C: ADWC) for the analog double screen (S79).

The luminance signal for the analog dual screen converted from the first DAC 410 and the second DAC 460 and the color signal for the analog double screen are added by the second adder 470 to output the composite video broadcast signal CVBS.

That is, the composite video broadcast signal is expressed as a formula as follows.

Composite Video Signal = Y + SIN (wt) * U + COS (wt) * V, w = 2 * pi * Fsc = Analog Y + Analog C

Where Fsc is the subcarrier sampling frequency, 3.58MHz for NTSC, and 4.43MHz for PAL.

As described above, the present invention transmits the composite video broadcast signal encoded by the normal picture and the slow picture reproduced by the recording and playback unit 370 into one screen.

The video signal generating apparatus and method thereof according to the present invention encode and transmit a digitized dual screen luminance signal and a color signal at the transmitting side, thereby reducing the loss of data, so that the receiving side can watch the dual screen with good image quality.

In addition, there is an advantage that the normal screen and the slow motion using the dual screen can be enjoyed even in a receiver that does not have a dual screen generator.

Claims (5)

A signal processor for converting and outputting a signal transmitted from the video camera into a signal for a normal video screen, a recording and playback unit for recording and shifting and reproducing a signal for a normal video screen output from the signal processor according to a control signal, and a control signal A dual screen generator for interpolating and decimating a signal for a normal video screen output from a signal processor and a signal for a shifted / played screen output from a recording / reproducing unit according to the And a dual screen transmitter for modulating screen information and converting the screen information into an analog signal and transmitting the composite video broadcast signal. The apparatus of claim 1, wherein the recording and reproducing unit reproduces and outputs a slow motion screen. The video signal generator according to claim 1, further comprising a switch for outputting a screen signal shifted and reproduced in the recording and playback section to a dual screen generation section by switching according to a control signal. Converting a signal transmitted from the video camera into a signal for a normal video screen, recording and shifting and reproducing a signal for a normal video screen according to a control signal, and converting a signal and a shift for a normal video screen according to a control signal And interpolating and decimating a signal for the reproduced screen to output dual screened screen information, and modulating and transmitting the dual screened screen information. The video signal generating method according to claim 4, wherein the signal for the screen shifted and reproduced in the step of outputting the double screened screen information is a signal reproduced as a slow motion screen.