KR20080064637A - Image Control Device and Image Control Method of Digital TV - Google Patents

Abstract

The apparatus for controlling a video of a digital television according to the present invention, which is capable of simultaneously processing a single-field vertical frequency (1Fv) mode and a two-field vertical frequency (2Fv) mode, in a digital television capable of receiving both PAL and NTSC methods. The image processor, a signal discrimination unit for determining whether the vertical frequency of the image signal input to the image processor is 50 kHz or 60 kHz, and if the received image signal is 50 kHz, the image processing unit to process 2Fv, And a controller configured to process the image processor by 1Fv when the image signal is 60 Hz. According to this, by processing the field vertical frequency of the video signal input to the image processing unit differently in the PAL method and the NTSC method, it is possible to achieve the best image quality in each of the PAL and NTSC method.

Description

Apparatus for controlling the image of digital television and Method

1 is a block diagram of an image control apparatus of a digital television according to an embodiment of the present invention;

2 is a flowchart illustrating an image control method of a digital television according to an embodiment of the present invention.

<Description of Major Symbols in Drawing>

10. Signal input unit 20. Signal determination unit

30. Control unit 40. Image processing unit

42. Scaler 50. Display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital television, and more particularly, to an image processing apparatus and an image processing method for digital television that can receive both PAL and NTSC.

In the color television broadcasting system, the image processing method is mainly used in the National Television System Committee (NTSC) method used in Korea, USA, Japan, PAL (Phase Alternation by Line) method used in Germany, Western Europe, China, and France, Eastern Europe. SECAM (Sequential Color with A Memory) method. In the NTSC system, digital television is rapidly being coped with, but in the PAL system, analog television is still used a lot.

Signals input from the signal input unit to the image processing unit are largely a luminance signal representing the contrast, a color signal representing the color, and a sync signal as information for transmitting the position and timing of the screen. The sync signal is divided into a horizontal sync signal (H sync) and a vertical sync signal (V sync).

On the other hand, the frequency of the vertical synchronization signal in the PAL system is 50 Hz, and the frequency of the vertical synchronization signal in the NTSC system is 60 Hz.

Here, the IC image processing unit is a specification for processing the vertical frequency, "1Fv only" of the two-field vertical frequency scanning method, the two-field vertical frequency scanning method "2Fv only" and "1Fv & 2Fv" employing both methods are classified into three types, and the "1Fv & 2Fv" specification is applied to the digital television according to the present invention.

However, in the PAL method, processing at 100 kHz (2Fv) is less likely to generate image flicker than processing 50 kHz (1 Fv) of vertical frequency. However, in the NTSC system, there is almost no flicker at 60 Hz (1Fv), but at 120 Hz (2Fv) the image flickers severely, which increases the likelihood of jagging. The problem here is that only models that can receive both PAL and NTSC from the input port of the "1Fv & 2Fv" specification can select only 1Fv or 2Fv.

Therefore, there is a limit in displaying the best picture quality in a television that can receive both PAL and NTSC.

In other words, when watching at 100Hz (2Fv) of the PAL method and the NTSC signal is input, it operates at 120Hz (2Fv), in which case there is a problem in image quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and the present invention provides a digital television capable of receiving both PAL and NTSC systems, when the NTSC signal is input during operation in the PAL 100 kHz (2Fv) mode. It is an object of the present invention to provide an image control apparatus and an image control method of a digital television that operate with a fan (1Fv).

In order to achieve the above object, an image control apparatus of a digital television according to the present invention is a digital television capable of receiving both a PAL system and an NTSC system, and has a single field vertical frequency (1 Fv) mode and a two field vertical frequency (2 Fv) mode. An image processor to enable simultaneous processing; A signal discriminating unit determining whether the vertical frequency of the image signal input to the image processing unit is 50 Hz or 60 Hz; And a controller configured to process the image processor 2Fv when the received image signal is 50 Hz, and process the image processor 1Fv when the received image signal is 60 Hz. .

On the other hand, the video control method of the digital television according to the present invention for achieving the above object comprises the steps of: a) receiving a video signal; b) determining whether the frequency of the received video signal is 50 Hz or 60 Hz; c) processing with 2Fv when the received frequency is 50 Hz; And, d) processing with 1Fv when the received frequency is 60 kHz.

The above objects, features and other advantages of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. Hereinafter, an image control apparatus and an image control method of a digital television according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, an image control apparatus of a digital television according to an embodiment of the present invention includes a signal input unit 10, a signal discrimination unit 20, an image processing unit 40, and a control unit 30. .

The signal input unit 10 may be used as a concept including all components including a function of outputting an image signal to the image processing unit 40. That is, the broadcast signal received through the antenna is tuned by the tuner to the broadcast signal of the channel selected by the viewer and output at an intermediate frequency, and the demodulator demodulates this output signal to output the data compressed in MPEG. The demux separates the compressed data into a video signal and an audio signal. The separated video signal is decoded and input to the image processor.

The signal discriminator 20 determines whether the signal input to the image processor 40 is a PAL signal or an NTSC signal. That is, it is determined whether the frequency of the input signal is 50 Hz or 60 Hz.

As described above, the image processor 40 uses the "1Fv & 2Fv" specification applicable to both 1Fv and 2Fv. On the other hand, the image processing unit 40 is provided with a scaler 42 for adjusting the scale of the screen. The scaler 42 functions to process the input signal to 2Fv. When the 50Hz signal is input, the scaler 42 scales the signal to 100Hz and 120Hz at which a 60Hz signal is input and outputs the same to the display unit 50.

When the received signal is determined to be 50 Hz, the controller 30 processes the signal to be output at 100 Hz (2 Fv) through the scaler 42 of the image processor 40, and the received signal is 60 Hz. If it is determined, the control unit outputs 1Fv without passing through the scaler 42 of the image processor 40.

As described above, according to the present invention, by processing the frame vertical frequency differently in the PAL method and the NTSC method, there is an advantage of realizing the best image quality in each of the PAL and NTSC methods.

1 and 2, an operation of an image control apparatus of a digital television according to an embodiment of the present invention having the above configuration and an image control method according to an embodiment of the present invention will be described.

First, when receiving an image signal output from the signal input unit 10 (S110), the signal determination unit 20 determines whether the frequency of the received signal is 50kHz or 60kHz (S120).

When the frequency of the received signal is 50 kHz (S130), the controller 30 processes the image processor 40 to scale the signal to 2 kHz, that is, to 100 kHz through the scaler 42 to display the display unit 50. Output to step (S140).

On the other hand, when the received frequency is 60 Hz, the controller 30 causes the image processing unit 40 to process the signal at 1 Fv, that is, 60 Hz without passing through the scaler 42 and output the same to the display unit 50. (S150).

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described specific embodiments. That is, those skilled in the art to which the present invention pertains can make many changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications are possible. Equivalents should be considered to be within the scope of the present invention.

As described above, according to the image control apparatus and the image control method of the digital television according to the present invention, the PAL and NTSC systems respectively process the frame vertical frequencies of the video signal input to the image processor. This has the effect of achieving the best image quality.

Claims (2)

In a digital television capable of receiving both PAL and NTSC systems, An image processor configured to simultaneously process one field vertical frequency (1 Fv) mode and two field vertical frequency (2 Fv) modes; A signal discriminating unit determining whether the vertical frequency of the image signal input to the image processing unit is 50 Hz or 60 Hz; And, And a controller which causes the image processor to process 2Fv when the received image signal is 50 Hz and the image processor to process 1Fv when the received image signal is 60 Hz. Video control device. a) receiving a video signal; b) determining whether the frequency of the received video signal is 50 Hz or 60 Hz; c) processing with 2Fv when the received frequency is 50 Hz; And, and d) processing the 1Fv when the received frequency is 60 kHz.

Images