KR100217178B1 - Automatic screen extension method - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

It relates to an automatic screen magnification device.

I. The technical problem that the invention is trying to solve

Regardless of the image, aspect ratio is determined and screen magnification is performed.

All. Summary of Solution of the Invention

The automatic screen magnification apparatus includes an AD converter which receives a composite video signal carrying an aspect ratio signal in a specific portion and converts the composite video signal into a digital signal, a memory for storing the digital composite video signal and outputting the composite video signal according to a read signal, and the digital signal. An aspect ratio signal discrimination unit for receiving aspect ratio information from an aspect ratio signal contained in a specific portion of the composite image signal, and a composite image signal stored in a memory by receiving the aspect ratio information; And a DA converter for receiving a composite video signal output from the memory and converting the analog video signal to an analog output.

la. Important uses of the invention

Used for wide televisions.

Description

Automatic screen magnifier {AUTOMATIC SCREEN EXTENSION METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wide televisions, and more particularly to an automatic screen magnification apparatus.

In general, wide televisions use an automatic screen magnification device to enlarge and output a received video signal. FIG. 1 illustrates a conventional automatic screen magnification apparatus. The apparatus for automatically expanding a screen shown in FIG. 1 includes an analog to digital (AD) converter 10 for converting an analog composite video signal received into a digital signal, and a vertical synchronization signal received from the digital composite video signal. The aspect ratio detection unit 12 that detects the aspect ratio and generates aspect ratio information by searching for which horizontal period starts, and the composite image signal stored in the memory 16 by receiving the aspect ratio information corresponding to the enlarged image The automatic magnification control unit 14 for enlarging the image by reading the image, the memory 16 for receiving and storing the composite image signal and outputting the composite image signal, and the memory 16 under the control of the auto magnification control unit 14. And a DA converter 18 for performing a digital-to-analog (DA) conversion of the enlarged video signal that is read and output.

If necessary, a signal correction device for correcting the enlarged video signal output from the memory 16 may be connected between the memory 16 and the DA converter 18.

Here, the operation of the aspect ratio detection unit 12 will be described in more detail. In general, a video signal is configured to correspond to an original image. When a video signal configured to correspond to the original image is received, it is configured to correspond to a specific size.

That is, the 16: 9 image shown in FIG. 2A further includes a predetermined black image at upper and lower ends to correspond to a specific size. In addition, the image of the cinema scope shown in FIG. 2B further includes a portion of a black image at the upper and lower ends so as to correspond to a specific size, and the portion of the black image is wider than 16: 9. In the case of the screen with the caption shown in FIG. 3C, since the caption is positioned at the bottom, a black image having a specific size is further provided only at the top.

Accordingly, the aspect ratio determination unit 12 searches for the aspect ratio of the original image by searching for the position of the image signal first appearing after the horizontal synchronization signal among the input image signals. In other words, as to the above, the position at which the black image, which is further provided in order to correspond to the specific size, is terminated is searched to find out what the aspect ratio of the original image is.

However, when an image in which a dark screen persists is input, the aspect ratio determination unit 12 cannot distinguish between the black image and the original image signal corresponding to a specific size. Accordingly, the aspect ratio determination unit 12 cannot accurately detect the aspect ratio. Also, even when the subtitles disappear for a long time from the video with the subtitles, the aspect ratio cannot be accurately retrieved.

As described above, the conventional aspect ratio detection is performed by simply detecting the position where the non-black image appearing after the vertical synchronization signal, so that the aspect ratio cannot be determined according to the image.

As described above, in the conventional automatic screen magnification, the aspect ratio detection cannot be performed correctly by detecting the first position where the video signal is generated instead of the black image after the vertical synchronization signal is generated.

Accordingly, an object of the present invention is to provide an automatic screen magnification apparatus that performs screen automatic magnification by accurately determining an aspect ratio regardless of an image.

1 is a block diagram of a conventional automatic screen magnification apparatus.

2A to 2C show images according to aspect ratios.

3 is a block diagram of an automatic screen enlargement apparatus according to a preferred embodiment of the present invention.

4 illustrates a composite video signal according to a preferred embodiment of the present invention.

5 is an aspect ratio signal discrimination unit of FIG. 3.

Automatic screen magnification apparatus of the present invention for achieving the above object is an AD converter for receiving a composite video signal carrying the aspect ratio signal in a specific portion and converts it into a digital signal, and stores and reads the digitally converted composite video signal A memory for outputting according to the signal, an aspect ratio signal discrimination unit for receiving the digitally converted composite image signal and detecting aspect ratio information from an aspect ratio signal contained in a specific portion of the composite image signal, and receiving the aspect ratio information And an automatic magnification control unit for generating a lead signal for reading the composite video signal stored in the corresponding video corresponding to the enlarged image.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the annexed drawings, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

In the composite video signal of the present invention, the aspect ratio signal is carried in a specific horizontal synchronizing period after the vertical synchronizing signal. The automatic screen magnification apparatus receiving the composite video signal retrieves the aspect ratio signal between the specific horizontal video devices to search the aspect ratio of the composite video signal.

3 is a block diagram of the automatic screen enlargement apparatus according to a preferred embodiment of the present invention as described above. 3 is the same as the conventional screen automatic enlargement apparatus except that the aspect ratio signal determination unit 20 is inserted in place of the aspect ratio detection unit 12, and thus the description of the remaining parts will be omitted.

First, the configuration of a composite video signal according to a preferred embodiment of the present invention will be described in detail. 4 illustrates the composite video signal. In the composite video signal shown in FIG. 4, an aspect ratio signal is carried in the nth horizontal signal period after the vertical synchronization signal.

In this case, the aspect ratio signal is set differently for each aspect ratio to distinguish the aspect ratio. The aspect ratio signal shown here is a digital signal '11011001', which represents a specific aspect ratio. The composite video signal as described above is transmitted and received on a high frequency carrier such that a conventional composite video signal is transmitted and received on a high frequency carrier to prevent an error.

FIG. 5 is a detailed circuit diagram of the aspect ratio signal determining unit 20 which detects an aspect ratio signal from the complex video signal as described above and transmits aspect ratio information to the automatic magnification control unit 14. The aspect ratio signal determination unit 50 as shown in FIG. 5 includes an aspect ratio signal gating unit 22 gating an aspect ratio signal from an image signal, and an aspect ratio signal gated by the aspect ratio signal gating unit 22. Input to low pass filter 24 for removal. The low pass filter 24 receives the gated aspect ratio signal and outputs the low pass filter. At this time, the high frequency carrier component of the aspect ratio signal is removed. The aspect ratio signal from which the high frequency carrier component is removed is input to the level shift unit 26. The level shift section 26 level shifts the aspect ratio signal to a digital level normally used. The level shifted aspect ratio signal is input to the aspect ratio signal reading unit 28. The aspect ratio signal reading unit 28 provides the aspect ratio information on the input aspect ratio signal to the automatic magnification control unit 14.

As described above, the present invention receives a composite video signal carrying an aspect ratio signal in a specific portion of the composite video signal, and detects the aspect ratio information by detecting the aspect ratio signal. Accordingly, the aspect ratio retrieval error caused by the same specific image and the original image used to detect the aspect ratio does not occur as in the prior art.

As described above, according to the present invention, the aspect ratio can be automatically magnified by determining the aspect ratio irrespective of the image, thereby preventing the aspect ratio search error caused by the same specific image and the original image used for detecting the aspect ratio. There is an advantage.

Claims (2)

In the automatic screen magnification device that receives a composite video signal containing the aspect ratio signal in a specific portion, An AD converter which receives the composite video signal and converts the composite video signal into a digital signal; A memory for storing the digitally converted composite video signal and outputting the composite video signal according to a read signal; An aspect ratio signal discrimination unit which receives the digitally converted composite image signal and detects aspect ratio information from an aspect ratio signal contained in a specific portion of the composite image signal; An automatic magnification control unit which receives the aspect ratio information and generates a read signal which leads the composite image signal stored in the memory corresponding to the enlarged image; And a DA converter for receiving a composite video signal output from the memory and converting the analog video signal to an analog output. The display device of claim 1, wherein the aspect ratio signal determination unit comprises: An aspect ratio signal gating unit which detects an aspect ratio signal by gating only a specific portion of the composite video signal; A low pass filter for low frequency filtering to remove high frequency carrier components of the gated aspect ratio signal; A level shift unit for level shifting the low pass filtered aspect ratio signal; And an aspect ratio signal reading unit configured to receive the level shifted aspect ratio signal and output aspect ratio information corresponding to the aspect ratio signal.