KR20010097700A - Method and apparatus for controlling OSD of digital TV - Google Patents

Abstract

The present invention relates to a digital TV's OSD control device and method for automatically converting OSD colors according to changes in color signals of video signals displayed on a screen. A microcomputer that outputs a control signal to analyze and selects an OSD color corresponding to the corresponding color signal, an OSD color selector which selects an OSD color corresponding to a color signal of an input video signal according to the control signal of the microcomputer, and a microcomputer It includes an OSD processing unit for processing the OSD color selected by the OSD color selection unit to be displayed on the screen according to the control signal of the system, and automatically converts the OSD color in real time according to the color signal change of the image signal displayed on the screen. It provides the convenience of using the product and also makes the color of the OSD transparent so that the actual broadcast screen is displayed. No harm to the user as it is effective to provide an effective broadcasting.

Description

OSD control device and method of digital TV {Method and apparatus for controlling OSD of digital TV}

TECHNICAL FIELD The present invention relates to TVs, and more particularly, to an OSD control apparatus and method for a digital TV.

In general, a digital TV is a device that receives a digital broadcast signal transmitted from a broadcasting station and provides a video and audio to a viewer. Most digital broadcasts follow the MPEG standard.

In particular, MPEG-2, the MPEG specification for broadcasting, has a system, audio, and video standard. For reference, the MPEG-2 system standard number is ISO / IEC 13818-1, the video standard number is ISO / IEC 13818-2, and the audio standard number is ISO / IEC 13818-3.

Hereinafter, an OSD control apparatus of a digital TV according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an OSD control device of a digital TV according to the prior art.

As shown in FIG. 1, an antenna 1 for receiving a digital broadcast signal and a tuner unit for receiving a signal output from the antenna 1, detecting a corresponding signal, correcting an error, and outputting a transport signal sequence ( 2), a TP analyzer 3 for receiving a transport signal sequence output from the tuner 2 and demultiplexing a corresponding signal, i.e., separating the signal into a video, audio, and additional information signal sequence, and the TP analyzer ( 3) a video decoder 4 for decoding the video signal sequence output from the audio signal, an audio decoder 5 for decoding the audio signal sequence output from the TP analyzer 3, and a decoding of the audio decoder 5 An audio DA converter 6 for converting a digital audio signal into an analog signal and outputting the same to a speaker (not shown), and adding the TP analyzer 3 according to a user's request input through the user interface 7. tablet A microcomputer 8 for processing a signal sequence and outputting control signals to each system part, a ROM 9-1 storing channels and programs, and a RAM storing temporary data by the operation of the microcomputer 8; 2) and an OSD processing unit 10 for receiving and processing OSD information corresponding to an input of an operation key of the user interface 7 according to the control signal of the microcomputer 8, and outputted from the video decoder 4. A switching unit 11 for selectively switching a digital video signal or OSD information of the OSD processing unit 10, and converting an image signal output from the switching unit 11 into a signal that can be displayed on a digital TV or a monitor. It consists of the NTSC encoder 12.

Referring to the operation of the OSD control device of the digital TV configured as described above in detail.

First, the tuner 2 receives a VSB (Vestigial Side Band) signal or a QAM (Quadrature Amplitude Midulation) signal output from the antenna 1, detects a corresponding signal, corrects an error, and outputs a transport signal sequence. .

The TP analyzer 3 receives the transport signal sequence received from the tuner unit 2 and outputs the demultiplexed signal, the video signal sequence, the audio signal sequence, and the additional information signal sequence.

Subsequently, the video decoder 4 receives the video signal sequence compressed and output from the TP analyzer 3 to MPEG-2, decompresses the corresponding signal, reduces the original image signal sequence, decodes it, and then decodes the NTSC encoder 12. Output

In this case, the data structure of the MPEG-2 includes six layers of a sequence layer, a GOP layer, a picture layer, a slice layer, a macro block layer, and a block layer.

In addition, the audio decoder 5 receives the voice signal string compressed and output from the TP analyzer 3 to Dolby AC3, decompresses the corresponding signal, reduces the original signal string, and decodes the decoded signal. The additional information signal string output from 3) is applied to the microcomputer 8.

The audio DA converter 6 then converts the digital voice signal string output from the audio decoder 5 into an analog voice signal string that can be processed by an amplifier (not shown) or a speaker (not shown).

Subsequently, when a preset operation key signal is input from the user interface 7 such as a remote controller or an operation key, the microcomputer 8 outputs an additional information signal string output from the TP analyzer 3 to output data corresponding to the corresponding signal. To process the additional information data to the OSD processing unit 10.

On the other hand, when the OSD color signal selected by the user directly from the user interface 7 is input, the microcomputer 8 selects the OSD color corresponding to the input signal from the ROM 9-1 in which the predetermined OSD color data is stored. Read from) and transmit it to the OSD processing section 10.

Subsequently, the OSD processor 10 converts the OSD signal transmitted from the microcomputer 8 into an image signal that can be processed by the NTSC encoder 12.

The switching unit 11 switches the OSD signal converted into the image signal by the OSD processing unit 10 or the video image signal converted by the video decoder 4 and applies it to the NTSC encoder 12.

That is, the switching unit 11 switches the video image signal output from the video decoder 4 when the OSD color signal selected by the user is not input through the user interface 7, and when the OSD color signal is input. The output signal of the video decoder 4 and the output signal of the OSD processor 10 are selectively switched to be output to the NTSC encoder 12.

Subsequently, the NTSC encoder 12 receives a signal transmitted from the switching unit 11 and converts the signal into a luminance signal Y and a color signal C so as to be displayed on a general TV or monitor.

However, the OSD control apparatus of the digital TV according to the related art described above has the following problems.

First, the user may change the preset OSD color according to the color signal change of the image signal displayed on the screen, causing inconvenience.

Secondly, due to the opacity of the OSD screen, the actual broadcast screen is covered.

Third, the long OSD processing time takes a lot of load on the system, shortening the life of the product.

Accordingly, the present invention has been made to solve the above-mentioned problems, and by automatically converting the OSD color in real time according to the color signal change of the image signal displayed on the screen to increase the user convenience and transparency of the OSD color An object of the present invention is to provide an OSD control apparatus and method of a digital TV for effectively delivering a broadcast screen.

1 is a block diagram showing the configuration of an OSD control device of a digital TV according to the prior art

Figure 2 is a block diagram showing the configuration of the OSD control device of the digital TV according to the present invention

3 is a diagram illustrating a hierarchical structure of MPEG-2 image data adopted in digital TV.

Figure 4 is a flow chart illustrating a method of controlling the OSD of the digital TV according to the present invention

Explanation of symbols for main parts of the drawings

100: antenna 200: tuner

300: TP analyzer 400: video decoder

500: audio decoder 600: audio DA converter

700: OSD color selector 800: User interface

900: microcomputer 1000: memory unit

1001: ROM 1002: RAM

1100: OSD processing unit 1200: Switching unit

1300: NTSC encoder

In order to achieve the above object, the ODS control apparatus of a digital TV according to the present invention analyzes a color signal of an input video signal when an OSD color conversion mode is set, and selects an OSD color corresponding to the corresponding color signal. An on-screen display, an OSD color selection unit for selecting an OSD color corresponding to the color signal of an input video signal according to the control signal of the microcomputer, and an OSD color selected from the OSD color selection unit according to the control signal of the microcomputer. It is characterized by including an OSD processing unit for processing to display on the.

In accordance with an aspect of the present invention, there is provided a method for controlling an OS of a digital TV, including determining whether an OSD color conversion mode is set, and if the OSD color conversion mode is set, matching the color signal of an input video signal. Selecting the OSD color, outputting the OSD according to the selected OSD color on the screen, and outputting the OSD according to the OSD color defined by default if the OSD color conversion mode is not set. It is composed of the features.

Hereinafter, an OSD control apparatus and method of a digital TV will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram showing the configuration of an OSD control apparatus for a digital TV according to the present invention, FIG. 3 is a diagram showing a hierarchical structure of MPEG-2 image data adopted in a digital TV, and FIG. 4 is according to the present invention. It is a flow chart showing how to control the OS of digital TV.

As shown in FIG. 2, the OSD control apparatus of the digital TV according to the present invention analyzes a color signal of an input video signal when the OSD color conversion mode is set and controls to select an OSD color corresponding to the corresponding color signal. A microcomputer 900 for outputting a signal, an OSD color selection unit 700 for selecting an OSD color corresponding to a color signal of an input video signal according to a control signal of the microcomputer 900, and the microcomputer 900 of the microcomputer 900; The OSD processing unit 1100 is configured to process the OSD color selected by the OSD color selection unit 700 to be displayed on the screen according to a control signal.

Referring to the operation of the OSD control device of the digital TV configured as described above in detail.

First, the antenna 100 receives a digital signal among broadcast signals transmitted from a broadcasting station.

Subsequently, the tuner 200 receives a VSB (Vestigial Side Band) signal or a QAM (Quadrature Amplitude Midulation) signal output from the antenna 100, detects a corresponding signal, corrects an error, and outputs a transport signal sequence.

In addition, the TP analyzer 300 receives the transport signal sequence output from the tuner unit 200 and demultiplexes the image signal sequence, the audio signal sequence, and the additional information signal sequence.

Subsequently, the video decoder 400 receives the video signal sequence compressed and output by MPEG-2 from the TP analyzer 300, decompresses the corresponding signal, reduces the original signal sequence, and decodes the output signal sequence.

Referring to FIG. 3, the data structure of the MPEG-2 will be described with a sequence layer 20, which is a group of screens having a series of same properties, that is, a screen size or a screen ratio, and is present in the sequence layer 20. The GOP layer 21, which is the smallest unit of a screen group that is a unit of random access, and the GOP layer 21 layer include a picture layer 22 representing a common property of a single screen, and a picture layer 22. The slice layer 23 having the common information, that is, the quantization characteristic value, and the slice layer 23 subdividing the slice layer 23 exist and the macro block layer 24 exists. The macro block is composed of a block layer 25 in which a digital communication terminal (DCT) is actually formed.

In this case, the picture layer 22 includes an 'I' picture representing an intra coded picture, that is, an intra frame or field coded picture, a 'P' picture representing a predictive coded picture, that is, a bidirectional predictive coded picture between frames or fields, and ' It consists of B 'pictures.

The audio decoder 500 receives the voice signal string compressed and output from the TP analyzer 300 to Dolby AC3, decompresses the corresponding signal, reduces the signal to the original voice signal string, decodes it, and outputs the decoded signal. The additional information signal string output from 300 is applied to the microcomputer 900.

Subsequently, the audio DA converter 600 converts the digital voice signal string output from the audio decoder 500 into an analog voice signal string and outputs the analog voice signal string to a speaker (not shown) or an amplifier (not shown).

When the OSD color conversion mode is set from the user interface 800, the microcomputer 900 receives an image signal output from the video decoder 400, analyzes a color signal of the corresponding signal, and matches the corresponding color signal. Controls OSD color selection.

Subsequently, the OSD color selection unit 700 selects an OSD color corresponding to the color signal of the image signal output from the video decoder 400 according to the control signal of the microcomputer 900.

In addition, the OSD processor 1100 processes the OSD color selected by the OSD color selection unit 700 to be displayed on the screen according to the control signal of the microcomputer 900.

Subsequently, the switching unit 1200 selectively switches the digital image signal output from the video decoder 400 and the OSD color signal output from the OSD processing unit 1100.

That is, if the OSD color signal is not output from the OSD processor 1100, the digital image signal output from the video decoder 400 is switched. If the OSD color signal is output, the output signal of the video decoder 400 and the OSD are output. The output signal of the processor 1100 is selectively switched and output to the NTSC encoder 1300.

Subsequently, the NTSC encoder 1300 converts the signal input by being switched by the switching unit 1200 into a luminance signal Y and a color signal C so as to be displayed on a general TV or monitor.

The OSD control method of the digital TV configured as described above will be described with reference to FIG. 4.

First, it is determined whether an operation key signal is input from the user interface 1000 (S10).

As a result of the determination (S10), when the operation key signal is input, it is determined whether the OSD color conversion mode is set (S20).

As a result of the determination (S20), if the OSD color conversion mode is not set, the OSD color corresponding to the OSD color defined as the default is output on the screen (S50).

On the other hand, if the OSD color conversion mode is set as a result of the determination (S20), the 'I' picture frame of the input video signal is extracted at predetermined intervals (S31).

The chroma component of the extracted 'I' picture frame is calculated (S32).

Here, the 'I' picture is less frequently used than the 'P' and 'B' pictures shown in FIG. 3, and the color of the screen is also less likely to suddenly change significantly in the same scene. Predict chromaticity changes.

In addition, since the digital TV is a digital signal, the pixel position and color information of the screen are also digital signals, so when calculating the chromaticity of the corresponding 'I' picture, the digital signal processing, that is, the sampling technique or the MSB (Most Significant Bit) The chromaticity component can be calculated within the range.

Subsequently, it is determined whether the difference between the currently calculated chromaticity component and the previously calculated chromaticity component is equal to or greater than a preset reference value (S33).

As a result of the determination (S33), if the difference between the calculated chromaticity component and the previously calculated chromaticity component is greater than or equal to a preset reference value, the image signal currently recognized by grasping that the color signal of the image signal displayed on the current screen is changed Select an OSD color corresponding to the color signal of (S34).

In this case, the OSD color corresponding to the chromaticity component of the video signal should have high transparency so as not to disturb the video signal displayed on the screen, and also select the OSD color closest to the color of the video signal displayed on the screen to display the user's broadcast screen. Reduces eyesight and eye strain.

In operation S40, the selected OSD color is displayed on the screen.

On the other hand, if the difference between the calculated chromaticity component and the previously calculated chromaticity component is less than or equal to a preset reference value, the determination result (S33) determines that the color signal change of the image signal displayed on the screen is not abrupt, and the previous OSD color. Maintain and output on the screen (S35).

As described above, the OSD control apparatus and method of the digital TV according to the present invention can provide the optimum OSD screen color by automatically converting and outputting the OSD color according to the color signal change of the image signal displayed on the screen. have.

As described above, the OSD control apparatus and method of the digital TV according to the present invention have the following effects.

First, by automatically changing the OSD color in accordance with the color signal change of the image signal displayed on the screen to provide the user with the convenience of using the product, and can reduce the discomfort and eye fatigue for watching the broadcast screen.

Second, it is possible to provide a clear broadcast screen to the user by increasing the transparency of the OSD screen so as not to disturb the video signal displayed on the screen.

Claims (5)

A microcomputer for analyzing a color signal of an input video signal when the OSD color conversion mode is set, and outputting a control signal to select an OSD color corresponding to the corresponding color signal; An OSD color selection unit for selecting an OSD color corresponding to a color signal of an input image signal according to the control signal of the microcomputer; And, And an OSD processing unit for processing the OSD color selected by the OSD color selection unit to be displayed on the screen according to the control signal of the microcomputer. Determining whether an OSD color conversion mode is set; If the OSD color conversion mode is set, selecting an OSD color corresponding to a color signal of an input video signal; Outputting an OSD according to the selected OSD color on a screen; And, And if the OSD color conversion mode is not set, outputting an OSD according to a default OSD color on a screen. The method of claim 2, Selecting an OSD color corresponding to the color signal of the input image signal Extracting a predetermined frame of an input video signal; Calculating a chromaticity component of the extracted predetermined frame; When the difference between the calculated chromaticity component and the previously calculated chromaticity component is equal to or greater than a preset reference value, selecting an OSD color corresponding to the color signal of the currently input video signal. Way. The method of claim 3, wherein And the predetermined frame is an 'I' frame of an input video signal. The method of claim 3, wherein And if the difference between the calculated chromaticity component and the previously calculated chromaticity component is equal to or less than a preset reference value, maintaining the previous OSD color and outputting the same on the screen.