KR0176914B1 - Screen aspects transformation apparatus with double screen display operation - Google Patents

Abstract

The present invention relates to a technology for displaying two screens using a screen aspect ratio converter (ARC), the conventional two-screen generator is provided with an integrated device for the two screen generation device and an integrated device for aspect ratio conversion. There was a combination of cost increases and it was difficult to adjust the aspect ratio of the screen.

Therefore, in order to solve this problem, the present invention generates a video signal reduced in the horizontal direction by 1/2 in the two-screen mode for the main screen video signal, and horizontally converted in accordance with the synchronization of the second image processing unit 200B in the one-screen mode. A first image processing unit (200A) for performing; A second image processing unit 200B for generating a video signal of which the horizontal direction is reduced to 1/2 in a two-screen mode for a screen image signal is provided, and is perpendicular to the first image processing unit 200A when configuring a single screen. When using the conversion unit 221, the second image processing unit 200B is configured to process the video signals of the main and sub-screens through the first and second image processing units 200A and 200B in accordance with the synchronization of the second image processing unit 200B. It was.

Description

Screen aspect ratio converter with 2-screen display

1 is a block diagram of a two-screen generator of a general television receiver.

2 is a block diagram of an embodiment of a screen aspect ratio converting apparatus having a two-screen display function of the present invention.

3 is a detailed block diagram of an exemplary embodiment of a main horizontal conversion unit in FIG.

4 is a detailed block diagram of an embodiment of a sub-horizontal conversion unit according to FIG. 2.

5 is a block diagram of the horizontal converter of the present invention showing an example of reducing the horizontal pixel number by 1/2.

6 is another exemplary block diagram of the present invention shown to share line memory.

* Explanation of symbols for main parts of the drawings

200A: first image processor 200B: second image processor

200C: Sync signal generator 200D: PIP / POP processor

201, 204, 210: A / D converters 202, 211: color demodulator

203, 212, 217, 218, 223: Multiplexer 205, 206: Field memory

207: main horizontal conversion unit 205, 209, 214, 215: line memory

213: sub-horizontal conversion unit 216: right reset signal generator

219: line delay 220: lead reset signal generator

221: vertical conversion unit 222, 227: D / A converter

224: PIP / POP Processor 225: Video RAM

226: demultiplexer 225: analog multiplexer

The present invention relates to a technology for displaying two screens by using a screen aspect ratio converter (ARC), in particular, to display two screens by using the aspect ratio converter of the screen, and to make it suitable for arbitrarily adjusting the aspect ratio of one screen. A screen aspect ratio converting apparatus having a screen display function.

FIG. 1 is a block diagram of a two-screen generator of a general television set, and as shown therein, a screen compressed in half in a horizontal direction by receiving a luminance signal (Y _main ) and a color signal (C _main ) for a _main screen. The main video signal processing unit 100A for processing and outputting the video signal having the magnitude, and the sub-screen luminance signal Y _sub and the color signal C _sub are input to the video signal of the screen size 1/2 compressed in the horizontal direction. A main image signal processing unit 100B for processing and outputting, a control unit 115 for managing memories of the main and sub image signal processing units 100A, 1005, the main and sub image signal processing units 100A, and ( a two-screen synthesis unit 100C for synthesizing the output image of the display in the horizontal direction and a picture-in-picture or picture-at-picture processing after receiving the video signal output from the sub-image signal processing unit 100B. Synthesized with the main screen video signal output from the unit (100C) When explaining the action thereof, to consist of PIP / POP processing unit (100D) as follows.

While the main signal luminance signal Y _main is directly converted into a digital signal through the A / D converter 101 and stored in the line memory 105, the main signal color signal C _main is a color demodulator in the analog state. 102 is demodulated by the color difference signals RY and BY, and then multiplexed through the multiplexer 103 to be temporally multiplexed, and then converted into digital signals by the A / D converter 104 and line memory 106. )

When the luminance signal Y _main and the color signal C _main are NTSC signals, the main image signals stored in the line memories 105 and 106 are written at a frequency of 14.3 MHz by the control of the controller 115. It is written and read at the frequency of 28.6 MHz, twice its frequency. The reason for this is that the reading speed of the video signal is twice as fast as the reading speed because the width of the screen must be reduced by 1/2 in the horizontal direction to form the two screens.

The sub-screen luminance signal Y _sub and the color signal C _sub are also processed similarly to the process of the main screen luminance signal Y _main and the color signal C _main . That is, the sub-screen luminance signal Y _sub is directly converted to a digital signal through the A / D converter 107 and written to the line memory 111 at a frequency of 14.3 MHz, while the sub-screen color signal C _sub is output. Is demodulated by the color demodulator 108 to be separated into color difference signals KY and RY, and then multiplexed in time by the multiplexer 109 to the line memory 112 through the A / D converter 104. The data is written at a frequency of 14.3MHZ, and the respective data read in the line memories 111 and 112 at a frequency of 28.6MHZ is written to the field memories 113 and 114 at a frequency of 28.6MHZ.

When displaying two screens in the horizontal direction, the positions of the line memories 111, 112, and the field memories 113, 114 may be interchanged. That is, first, the video signals are stored in the field memories 113 and 114 to align vertical synchronization with the main video signals, and the signals output here are input to the line memories 111 and 112, thereby halving the width in the horizontal direction. By the same compression, the same result is obtained.

In addition, the horizontal processing unit 116 inputs the main screen image signal output from the main image signal processing unit 100A and the sub screen image signal output from the sub image signal processing unit 100B. In other words, the main screen video signal is input during the left half cycle of the screen, and the sub-video video signal is input during the remaining half cycle of the horizontal scanning cycle. BY) is output, which is converted into an analog signal through the D / A converter 117 and output.

On the other hand, the sub-picture video signals Y _{sub and} C _sub are displayed in a picture-in-picture (PIP) or picture-at-picture (POP) method without displaying on the 1/2 screen in the horizontal direction. Occation. Since the resolution of the _sub picture video signals Y _sub and C _sub is considerably lower than the resolutions of the _main picture video signals Y _main and C _main , only 16-bit digital signals are sufficient.

That is, only the upper 6 bits of the 8-bit outputs output from the A / D converters 107 and 110 are processed, and the luminance signal Y, the color difference signal RY, and BY are converted into a 4: 2: 2 format ( The multiplexer 118 is passed through to obtain Y, RY, Y, BY, Y, RY, and Y. BY. The video signal for the sub-screen thus passed is input to the PIP / POP processor 119, processed into a form suitable for displaying as a PIP or POP image, and then stored in the video RAM 120, and then the sub-screen is displayed on the main screen. When the position is to be displayed, it is supplied to the analog multiplexer 123 through the demultiplexer 121 and the D / A converter 122 to be multi-processed with the video signal for the main picture. At this time, the analog multiplexer 123 selects the sub picture video signal under the control of the screen selection signal SEL output from the PIP / POP processor 119.

However, such a conventional two-screen generating device has a defect that increases the cost because it is provided with an integrated device for a two-screen generating device and an integrated device for aspect ratio conversion, there is a difficulty in adjusting the aspect ratio of the screen.

Accordingly, an object of the present invention is to provide a screen aspect ratio converting apparatus having a two-screen display function that allows display of two screens by using an aspect ratio converting apparatus of a screen and arbitrarily adjusts the aspect ratio of one screen.

FIG. 2 is a block diagram showing an embodiment of a screen aspect ratio converting apparatus having a two-screen display function of the present invention for achieving the above object. As shown in FIG. _main) (first image to the _main C) intended for two-screen mode, generating a 1/2 reduced image signal in the horizontal direction, and subjected to level conversion according to the synchronization of the second image processing unit (200B) in the first screen mode processing ( 200A); A second image processor (200B) for generating a video signal reduced in half in the horizontal direction in a two-screen mode for a sub-screen video signal (Y _sub ) (C _sub ); A synchronization signal generator 200c for selectively receiving the vertical and vertical synchronization signals of the main and sub-image signals to control access to memories built into the first image processor 200A and the second image processor 200B; A vertical conversion unit 221 for performing vertical conversion of the screen on the output image signal of the first image processing unit 200A in the two-screen mode and passing it through in the one-screen mode; PIP / POP for receiving a video signal output from the second video signal processor 200B and processing a picture in picture or a picture at picture and synthesizing it with the main picture video signal output from the vertical converter 221. It will be described in detail with reference to Figures 3 to 6 attached to the operation and effects of the present invention configured as described above, which is configured as a processing unit 200D.

The luminance signal Y _main for the main screen is converted into a digital signal through the A / D converter 201 and then supplied to the one side input of the main horizontal converter 206 through the field memory 205. In addition, the _main signal color signal C _main is also separated into the color difference signals RY and BY through the color demodulator 202, and is further multiplexed in time through the multiplexer 203, and then A / D converter ( 204 and the field memory 206 are supplied to the other input of the main horizontal conversion unit 207.

In addition, the sub-screen luminance signal Y _sub is supplied to one side input of the sub-horizontal conversion unit 213 through the A / D converter 210, and the sub-screen color signal C _sub is supplied to the color demodulation unit 211 and the _sub- screen. The multiplexer 212 is supplied to the other input of the sub-horizontal conversion unit 213.

The output of the main horizontal converter 207 is input to the line memories 208 and 209, and the output of the sub-horizontal converter 213 is input to the line memories 214 and 215. The data write / lead timing of the line memories 208, 209, 214, and 215 is written at a frequency of 14.3MHZ and then read at twice the frequency of 28.6MHZ as in the prior art. By doing so, you can get a vertical two-screen image that is reduced by half horizontally.

If the line memories 208, 209 of the main screen are read first when the line memories 208, 209, 214, 215 are read, the next line is read when the line memories 214, 215 of the subscreen are read. In order to do this, the read reset of the field memories 205 and 206 is delayed by one line through the line delay unit 219 and the read reset signal generator 220.

In the horizontal two-screen mode, the vertical converter 221 does not operate but only plays a role of passing the input data as it is. In this horizontal two-screen mode, the synchronization signal selects and uses the vertical synchronization signal V _sync-sub and the horizontal synchronization signal H _{sync-sub of the sub-screen} , because in the present invention, the field memories 205 and (206) are used. ) Is used to process the main screen, so that it delays the video signal (Y _main ) (C _main ) of the _main screen to match the vertical sync signal (V _sync-sub ) of the _sub screen.

The reason for using the field memories 205 and 206 to process the main screen is to perform horizontal conversion through the main horizontal plane switching unit 207 and vertical conversion through the vertical conversion unit 221 when viewing one screen. This is to adjust the aspect ratio of the screen.

Therefore, the vertical conversion unit 221 processes the vertical conversion of the screen by using all the main image signals input and output to the line memories 208 and 209. The vertical synchronization signal V _sync output from the multiplexer 218 is delayed by one horizontal line through the line delay 219 and then supplied to the read reset signal generator 220 so as to supply the read signals of the field memories 205 and 205. Used to generate a read reset signal.

The operation of the main horizontal conversion unit 207 will be described in more detail with reference to FIG. 3. The luminance signal Y _m output from the field memory 205 is divided into the sample memory 301 and the interpolation unit 302. Is supplied to the attenuation unit 303, and at this time, the coefficient selector 311 adjusts the conversion coefficients supplied to the interpolation unit 302 and the attenuation unit 303 to achieve a desired horizontal conversion. That is, by using one sample memory 301, the conversion rate is determined according to the conversion coefficient that gives the weight of each sample to perform horizontal conversion.

In addition, since the color signal C _m exists between the color difference signals RY and BY by one sample, two sample memories 305 and 306 are used, and the interpolation unit 307 between the coefficient selector 312 is used. The conversion coefficient of each sample is selected through the attenuation unit 308 and the attenuation unit 308. At this time, the conversion coefficient selection clock is 1/2 of the luminance signal clock, and the two color signals of the color difference signal RY and the color difference signal BY are obtained. The conversion factor should be selected as follows.

Here, the clock counter 313 is used to generate the write / read reset signal required for the line memories 208, 209 and 214, 215 and the line memory enable signal corresponding to each horizontal conversion ratio.

The operation of the sub-horizontal transformation unit 213 will be described in more detail with reference to FIG. 4. When two images are horizontally multiplexed as they are, an image signal having an aspect ratio of 4: 3 is 1/2 of a 16: 9 screen. This is equivalent to displaying an image signal with an aspect ratio of 4: 3 on an 8: 9 screen, so that the screen is narrowed horizontally by 8/9 ÷ 4/3 = 2/3. The sub-horizontal transformation unit 213 as a figure serves to widen the screen by 2/3 in the horizontal direction.

However, in this case, a video signal having an aspect ratio of 4: 3 is displayed on a screen having an aspect ratio of 8: 9, so that only 2/3 of the image is visible horizontally. The two-window window pulse generator 409 processes this. In this case, a pulse having a width of 2/3 of a horizontal period is generated to generate a write enable signal WE so that only data corresponding to this section can be written to the line memories 214 and 215.

Since the write enable signal WE is generated in a different form in the aspect ratio conversion of the main horizontal conversion unit 205, the write enable signal WE is selectively used. This window pulse can be a section containing the desired position without necessarily having to be placed in the middle of the screen. Of course, if you make two screens in the horizontal direction without 3/2 magnification, you can see the entire screen even though the screen is longer in the vertical direction.

Meanwhile, FIG. 5 illustrates an embodiment of a horizontal conversion unit which reduces the horizontal pixel number to 1/2, and the horizontal 3/4 reduction unit 502 in the main horizontal conversion unit 207 and the sub-horizontal conversion unit 213. Using 505, the number of pixels is reduced by 3/4 in the horizontal direction, and 2/3 window pulses are applied to the line memories 208, 209 and 214, 215 to write the data amount 4/3 ×. This reduces 2/3 = 1/2 ton, which eliminates the need to read at twice the speed when reading the line memories 205, 209 and (214.215).

In other words, since the total data amount for two screens is the same as the normal data amount for one screen, it can be read as it is when writing. In this case, as shown in FIG. 2, four line memories 208 and 209. (214 and 215) are not necessary, and only two line memories need to be used.

6 illustrates an embodiment of the present invention for sharing a line memory. As shown in FIG. 6, the main horizontal converting unit 207 and the sub horizontal converting unit 213 are divided into two parts during the half period of the horizontal synchronization signal H _sync . By alternately selecting the two line memories 601 and the line memories 602, the video signals of the two screens can be stored together in one line memory.

As described in detail above, the present invention can reduce the cost by constructing two screens by using a technology of converting the aspect ratio of the screen, and by changing the aspect ratio of the screen when constructing one screen. There is an effect that can provide a screen with a ratio suitable for the preference.

Claims (4)

By using the aspect ratio adjustment function. The first image processing unit generates a horizontally reduced image signal in the horizontal direction in the two-screen mode and performs horizontal conversion in synchronization with the second image processing 200B in the one-screen mode. 200A); A second image processing unit (200B) for generating an image signal reduced by 1/2 in a horizontal direction in a two-screen mode by using an aspect ratio adjustment function; A ventilation signal generator (200C) for selectively receiving horizontal and vertical synchronization signals of the main and sub-image signals to control access to the memory built in the first and second image processing units (200A) and (200B); The two-screen display function, characterized in that the vertical conversion of the screen for the output image signal of the first image processing unit 200A in the two-screen mode, and the vertical conversion unit 221 to pass through as it is in the one-screen mode Screen aspect ratio converter. 2. The first image processor 200A of claim 1, wherein the first image processor 200A includes a sample memory 301, an interpolator 302, and an attenuator 303 connected in series to adjust and output a screen horizontal ratio conversion ratio of the luminance signal for the main screen. Wow; Sample memory 305, 306, interpolator 307, and attenuator 308 connected in series for adjusting and outputting a screen horizontal ratio conversion rate of the main signal color signal; A coefficient selector (311) for adjusting a conversion coefficient supplied to the interpolator (302) and the attenuator (303) to achieve a desired horizontal transformation; In selecting the conversion coefficients of the respective samples through the interpolation unit 307 and the attenuator 308, the half of the luminance signal clock is converted into two color signals of the color difference signal RY and the color difference signal BY. 2. A screen aspect ratio conversion apparatus having a two-screen display function, comprising a main horizontal conversion section 207 comprising a coefficient selection section 312 for selecting a conversion coefficient so as to select a coefficient. The image processing apparatus of claim 1, wherein the second image processing unit 200B includes a sample memory 401 and a horizontal 3/2 enlargement unit 402 connected in series for outputting the luminance signal for sub-screen 3/2 in the horizontal direction. ; A sample memory 403, 404 and a horizontal 3/2 enlargement section 405 connected in series for outputting the sub-screen color signal 3/2 in the horizontal direction; A pulse having a width of 2/3 of a horizontal period is generated to generate a write enable signal WE so that only data corresponding to this section can be written to the line memories 214 and 215. And a sub-horizontal conversion unit 213 including a double-window window pulse generator 409 for supplying to the line memories 214 and 215, in which the output signals of the expansion unit 402 and 405 are stored. A screen aspect ratio converter having a two-screen display function. According to claim 1, in order to be able to go to store the video signal of the two screens in a line memory, a horizontal synchronization signal (H _sync), the main level conversion section 207 and the sub-horizontal conversion section (213 for a half period of the A screen aspect ratio converting apparatus having a two-screen display function, characterized in that the two lines memory is alternately selected.