KR20000034259A - Apparatus adjusting picture aspect ratio for wide television - Google Patents

Abstract

PURPOSE: An apparatus adjusting picture aspect ratio for wide television is provided to convert a picture aspect ratio of 4 to 3 to a picture aspect ratio of 16 to 9 by adjusting the samples of the screen adequately. CONSTITUTION: An apparatus adjusting picture aspect ratio for wide television includes an image reader(104), a linear data converter(108), a nonlinear data converter(110), and a switch(106). The image reader(104) determines whether the input image is a normal mode image or a wide mode image. The linear data converter(108) subtracts M sample data required for display and generates a wide mode image when the input image signal is the wide mode image. The nonlinear data converter(110) subtracts M sample data required for display and generates a normal mode image when the input image signal is the normal mode image. The switch(106) supplies the wide mode image for display or a normal mode image for wide mode conversion display to a displayer.

Description

Widescreen TV's Aspect Ratio Converter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wide televisions, and more particularly to conversion of aspect ratios of wide televisions suitable for processing video signals having a 4: 3 aspect ratio in plasma display televisions (also called PDP) televisions having a wide aspect ratio of 16: 9. Relates to a device.

In general, signals having a video size of 4: 3 are used as a video of a television broadcast, and a general television adopts a monitor having an aspect ratio corresponding to the size of the received video, that is, a 4: 3 aspect ratio. .

Recently, various technology broadcasting methods (eg, HDTV, satellite broadcasting, etc.) have been developed everywhere to perform some services. In this new broadcasting method, unlike the conventional method described above, a higher level of image quality is achieved. Adoption of broadcast video having a 16: 9 wide size is actively considered, and in order to cope with this, the widespread use of wide televisions (eg, PDP TVs, HDTVs, etc.) having a 16: 9 aspect ratio is gradually expanded. It's happening.

Therefore, considering the present transitional situation in which ordinary television and wide television must coexist, broadcast signals having a wide size (16: 9) can be received and processed in a general television, and also in a wide size television (4). It must have compatibility to be able to receive and process broadcast signals with: 3). Herein, the present invention relates to an improvement in a technique for adaptively processing a broadcast image of a general size or a broadcast image of a wide size in a wide television, especially a wide PDP TV.

On the other hand, as part of a method of displaying a broadcast image having a general size (4: 3) on a monitor having a wide aspect ratio (16: 9) in a widescreen television, there is a method of extending and displaying a general size image to a wide size image.

However, in the case of such an image expansion method, a broadcast image having a general size received is expanded and displayed to fit a wide size by using a technique such as interporation, which is displayed on a wide monitor. Since this is displayed in a form that seems to extend in the horizontal direction as a whole, there is a problem that the sense of reality or reality is reduced.

That is, as an example, when the 4: 3 size image as shown in FIG. 2A is expanded to 16: 9 according to the conventional method, as shown in FIG. Reality, etc. will fall.

Accordingly, the present invention is to solve the above problems of the prior art, by adaptively adjusting the number of samples of the sampled image according to the position of the screen, converting 4: 3 aspect ratio image to 16: 9 aspect ratio image It is an object of the present invention to provide an aspect ratio conversion device for wide televisions.

In order to achieve the above object, the present invention provides a device for converting a general mode image having an aspect ratio of 4: 3 into a wide mode image having an aspect ratio of 16: 9. Image mode discrimination means for detecting whether an input image is the normal mode image or the wide mode image, and generating an image mode discrimination signal corresponding thereto; When the input image signal is the wide mode image, M sample data required for display by discarding one sample per n samples from N sample data of each line obtained by converting the analog input image into digital image data. Linear data conversion means for generating a wide-mode image for display by extracting the image; When the input image signal is the normal mode image, the N sample data of each line obtained by converting the analog input image into digital image data is a relatively small number of samples at the center portion of the line compared to both edge portions of the line. Nonlinear data conversion means for extracting M sample data required for display to generate a normal mode image for display converted to the wide mode; And switching means for providing the generated wide mode image for display or the generated wide mode conversion display general mode image to a display side in response to the generated video mode determination signal. .

1 is a block diagram of an aspect ratio conversion apparatus for a widescreen television according to a preferred embodiment of the present invention;

2A illustrates an example of a typical 4: 3 screen, and FIG. 2B illustrates an example in which a 4: 3 screen is converted to a 16: 9 screen according to the present invention. Illustrated diagrams each showing examples converted to screens.

<Description of the code | symbol about the principal part of drawing>

102: A / D conversion block (ADC) 104: video mode determination block

106,112: switching block 108: linear data converter

110: nonlinear data converter 114: memory block

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a block diagram of an aspect ratio converting apparatus of a wide television (particularly, a PDP TV) according to a preferred embodiment of the present invention.

As shown in the figure, the aspect ratio conversion apparatus of the present invention includes an A / D conversion block 102, an image mode determination block 104, a first switching block 106, a linear data converter 108, and a nonlinear data converter. 110, the second switching block 112, and the memory block 114.

Referring to FIG. 1, in the A / D conversion block 102, an input video signal (such as an analog RGB signal (eg, an RGB signal of an image having a 16: 9 or 4: 3 aspect ratio) through a matrix block not shown) Is converted into digital image data of n bits (for example, each of 8 bits of RGB) by sampling a predetermined predetermined sampling clock, and the converted digital image data is converted into a first switching block. To a fixed contact a of 106. Here, in the case of PDP TV, 1152 samples are sampled per line.

Also, the image mode determination block 104 extracts horizontal and vertical synchronizing signals from the input image signal, and based on the horizontal and vertical synchronizing signals extracted from the input image signal, the input image signal is a general image having an aspect ratio of 4: 3 or It is detected whether the image is a wide image having an aspect ratio of 16: 9, and based on the detection result, a corresponding image mode discrimination signal is generated through the line L11 and provided to the first and second switching blocks 106 and 112, respectively. .

For example, the image mode discrimination block 104 generates a low level image mode discrimination signal on the line L11 when the input image is a wide mode image (16: 9 screen), so that the first and second switching blocks 106 and 112 are used. If the input image is a normal mode image (4: 3 screen), a high level image mode discrimination signal is generated on the line L11 and provided to the first and second switching blocks 106 and 112, respectively.

In this case, the first and second switching blocks 106 and 112 are connected to the contacts ab and b'-a ', respectively, when the low level image mode determination signal is provided through the line L11, and the high level through the line L11. When the image mode discrimination signal is provided, the contacts ac and c'-a 'are connected respectively.

That is, the first switching block 106 provides n-bit digital image data (wide image data) to the linear data converter 108 by connecting the contacts ab when the input image is the wide mode image (16: 9 aspect ratio). When the input image is a normal mode image (4: 3 aspect ratio), the contact ac is connected to provide n-bit digital image data (general image data) to the nonlinear data converter 110.

On the other hand, the linear data converter 108 processes wide mode image data, and discards one sample per four samples out of 1152 samples per line (linear sampling with uniform spacing) in a manner of 864 per line. Samples (n bits each of RGB), and convert n-bit sample data, for example, 8-bit sample data into serial data reconstructed into eight subfields, to the contact b of the second switching block 112. Connect.

In addition, the nonlinear data converter 110 processes the normal mode image data, and does not take the normal mode image in a linear manner with a uniform interval as in the linear data converter 108 described above, but in a uniform interval. Sampling is performed in a non-linear manner without, and then, for example, 8-bit sample data is converted into serial data reconstructed into eight subfields and connected to the contact c of the second switching block 112.

More specifically, the nonlinear data converter 110 takes fewer samples at approximately the center of the line (or screen) and prevents more from both corners to prevent the image from expanding laterally in the center of the screen. Sampling by taking a large number of samples, e.g. subtracting one sample per 8 samples from 1 to 144 sample intervals, subtracting one sample per 4 samples from 145 to 360 sample intervals, and 361 to 576 sample intervals Subtracts one sample per three samples, one sample per three samples in the 576-792 sample interval, one sample per four samples in the 792-1008 sample interval, and 8 in the 1008-1152 sample interval. 864 samples are taken from 1152 samples by subtracting one sample per sample.

That is, in the nonlinear data converter 110, 864 required for display in 1152 samples are taken in such a way that it takes fewer samples in the approximately center portion of the line (or screen) and takes more samples in both corner portions. By taking the sample, it is possible to prevent a phenomenon in which the image displayed in the approximately center portion of the screen is expanded laterally when the converted normal mode image is displayed on the wide monitor (not shown).

For example, as shown in FIG. 2B, in the case of a general video signal extended to a wide width according to the present invention, a phenomenon in which the image is extended sideways to some extent appears at both corners of the screen, but the image is extended sideways in the center portion of the screen. The phenomenon does not appear at all. Thus, viewers will be able to watch broadcast programs without losing their sense of reality.

Next, in the second switching block 112, when the input image is the wide mode image (16: 9 aspect ratio), it is sampled by connecting the contacts b'-a 'based on the image mode discrimination signal on the line L11 to the subfield. Providing reconstructed serial image data (ie, wide image data) to the memory block 114, and based on the image mode discrimination signal on the line L11 when the input image is a normal mode image (4: 3 aspect ratio), the contact point c'- By concatenating a ', serial image data (ie, general image data converted to wide width) sampled and reconstructed into subfields is provided to the memory block 114.

Here, the memory block 114 stores image data (wide image data or converted general image data) reconstructed into subfields, and the image data stored therein is provided to a data processor (not shown), thereby providing Is displayed on the screen.

On the other hand, while the PDP TV is described as an example in the preferred embodiment of the present invention as described above, the present invention is not necessarily limited to this, and can be applied to any wide TV having a 16: 9 aspect ratio.

As described above, according to the present invention, when converting a general image having an aspect ratio of 4: 3 to a wide image having an aspect ratio of 16: 9, fewer samples are taken at approximately the center of the line, and both edges of the line are taken. By selecting a larger number of samples in the part and taking as many samples as necessary for the display, when the converted normal mode image is displayed on the wide monitor, the image displayed in the approximately center part of the screen is expanded sideways. can do. Therefore, in the present invention, when a general image is converted into a wide image and viewed on a wide monitor, the broadcast program can be watched without loss of reality or reality.

Claims (3)

An apparatus for converting a normal mode image having an aspect ratio of 4: 3 to a wide mode image having an aspect ratio of 16: 9, Image mode discrimination means for detecting whether the input image is the normal mode image or the wide mode image based on the horizontal and vertical synchronization signals extracted from the analog input image signal, and generating an image mode discrimination signal corresponding thereto; When the input image signal is the wide mode image, M sample data required for display by discarding one sample per n samples from N sample data of each line obtained by converting the analog input image into digital image data. Linear data conversion means for generating a wide-mode image for display by extracting the image; When the input image signal is the normal mode image, the N sample data of each line obtained by converting the analog input image into digital image data is a relatively small number of samples at the center portion of the line compared to both edge portions of the line. Nonlinear data conversion means for extracting M sample data required for display to generate a normal mode image for display converted to the wide mode; And And switching means for providing the generated wide mode image for display or the generated wide mode conversion display general mode image to a display side in response to the generated video mode determination signal. 2. The apparatus of claim 1, wherein the linear data converting means and the nonlinear data converting means each include means for reconstructing n-bit sample data in the M sample data into n subfields and converting the data into serial data. Aspect ratio converter of widescreen TV. The non-linear data converting means according to claim 1 or 2, wherein when the N sample data is 1152 and the M sample data is 864, one sample per 8 samples in a 1 to 144 sample interval is generated. Subtract one sample per four samples from the 145-360 sample interval, one sample per three samples from the 361-576 sample interval, one sample per three samples from the 576-792 sample interval, And extracting 864 sample data by subtracting one sample per four samples from the 792-1008 sample interval and subtracting one sample per eight samples from the 1008-1152 sample interval.