KR20020059544A - Apparatus for Controlling Video of Digital TV - Google Patents

Abstract

PURPOSE: A device for controlling video of a digital TV is provided to maintain OSD(On Screen Display) with an original color, regardless of color adjustment for the video, so as to eliminate troubles in using the TV of a user. CONSTITUTION: A tuner(100) receives digital broadcasting signals. A TP(Transport Packet) divider(110) divides TPs of the received digital broadcasting signals into audio, video signals and additional information. An audio and a video decoders(120,200) respectively decode the divided audio and video signals. An audio processor(130) converts the digital audio signals decoded in the audio decoder into analog signals. An audio output unit(140) outputs the analog audio signals. A memory(320) stores a color adjustment value for the video signals set by a user. A video processor(210) adjusts colors corresponding to the color adjustment value for the video signals excluding video format transformation and OSD signals. A display unit(220) displays the video signals and OSD outputted in the video processor on a screen. A microcomputer(310) outputs a control signal to the video processor, to store the corresponding color adjustment value set by the user in the memory and transmits the value to the audio processor for color adjustment.

Description

Apparatus for Controlling Video of Digital TV

The present invention relates to a TV, and more particularly, to an image control apparatus for a digital TV.

Digital TV is a device that receives the digital broadcasting signal transmitted from broadcasting station and provides the video and audio to viewers. When the final output is 720P (Progressive) or 1080I (Interlace), it is called HDTV (High Definition TV), and 480P output In the case of having a 480I output, which is currently NTSC, it is called an SDTV (Standard Definition TV).

In general, most digital broadcasts follow the MPEG standard. In particular, MPEG-2, the MPEG standard for broadcasting, has all the system, audio, and video standards. 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.

US digital TVs, on the other hand, do not use MPEG audio and follow the Dolby AC-3 audio standard.

Hereinafter, a digital TV according to the related art and an image control method thereof will be described with reference to the accompanying drawings.

1 is a view showing the configuration of a digital TV according to the prior art.

As shown in FIG. 1, the digital TV divides a tuner 10 that receives a digital broadcast signal and a TP (Transport Packet) among the digital broadcast signals received by the tuner 10 into audio, video signals, and additional information. TP splitter 20, audio and video decoders 30 and 40 for decoding audio and video signals separated from the TP splitter 20, and digitally decoded by the voice decoder 30. A voice processor 31 for converting a voice signal into an analog signal, a voice output unit 32 for outputting an analog voice signal, a microcomputer 60 for controlling a TV system, and a temporary for operation of the microcomputer 60 A memory 70 for storing data and storing various setting information input from a user, an image processor 41 for processing the digital image signal decoded by the image decoder 40 to fit the video format of the TV itself; Color, video, and deflection of video signals The video controller 42 includes a video controller 42 and a display unit 43 for displaying a video signal on a screen.

In this case, the display unit 43 may be a CRT, LCD, PDP, and the like.

Referring to the display control method of the digital TV according to the prior art configured as described above, the digital broadcast signal received through the tuner 10 is separated into audio and video signals through the TP separation unit 20, the audio signal To the audio decoder 30, the video signal is sent to the video decoder 40.

Here, the video signal separated from the TP separator 20 is data compressed by the MPEG-2 method. Therefore, the image decoder 40 decompresses the compressed image signal string, reduces the original image data, and outputs the original image data to the image processor 41.

Subsequently, the image processor 41 performs image format conversion to adjust the received low resolution image signal to a high resolution image suitable for video output of the TV itself.

In addition, the image processor 41 controls the color, image, and deflection so as to mix the video, the additional image information, and various OSD signals of the image signal sequence and to implement the digital image data in a general TV or monitor. Will output

In addition, the video control unit 42 controls the color, video, and deflection of various OSD signals according to a user's operation command through the user interface unit 50 and a video signal received from a broadcasting station, such as video and additional video information. Displayed through section 43.

However, the video display control method of the TV according to the related art described above includes a video signal received from a broadcasting station, video signals such as additional video information, and various OSD signals input through a user interface unit, which are mixed in a color processor, a video signal, and a deflection. Since the adjustment is made in the image controller, when the user adjusts the color portion of the image, that is, the color, contrast, and hue of the image, the color of the OSD is also changed. Therefore, there is a problem that causes confusion when the user uses the OSD.

Accordingly, the present invention has been made to solve the above problems, and to maintain the OSD to the original color regardless of the color adjustment of the image to eliminate the inconvenience when using the TV TV control device The purpose is to provide.

1 is a block diagram showing the configuration of a digital TV according to the prior art

2 is a block diagram showing a first embodiment of a digital TV according to the present invention.

3 is a block diagram showing a second embodiment of a digital TV according to the present invention.

4 is a flowchart illustrating a method of controlling an image of a digital TV according to the present invention.

Explanation of symbols for main parts of the drawings

100: tuner 110: TP separation unit

120: voice decoding unit 130: voice processing unit

140: audio output unit 200: video decoding unit

210: image processor 220: display unit

300: user interface unit 310: microcomputer

320: memory 321: ROM

322: RAM

Digital TV according to the present invention for achieving the above object is a digital TV, the memory unit for storing the video signal color adjustment value set by the user, and the video signal except the image format conversion and OSD signal, the color The image processing unit for performing color adjustment corresponding to the adjustment value, the display unit for displaying the image signal and the OSD output from the image processing unit on the screen, and the corresponding color adjustment value when setting the user's color adjustment value of the memory And a microcomputer for outputting a control signal to the image processing unit so that the color is stored and transmitted to the image processing unit to perform color adjustment.

Digital TV according to the present invention for achieving the above object is a digital TV, the memory unit for storing the video signal color adjustment value set by the user, and the video signal except the image format conversion and OSD signal, the color An image processing unit for adjusting the color corresponding to the adjustment value, a deflection control unit for adjusting the deflection of the image signal output from the image processing unit, a display unit for displaying the image signal and the OSD output from the deflection processing unit on the screen And a microcomputer for storing the corresponding color adjustment value in the memory unit and transmitting the control signal to the image processing unit to perform color adjustment when the user sets the color adjustment value. There is this.

Hereinafter, a digital TV and an image display control method according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a first embodiment of a digital TV configuration according to the present invention, FIG. 3 is a block diagram showing a second embodiment of a digital TV configuration according to the present invention, and FIG. 4 is a digital diagram according to the present invention. This is a flow chart showing the video control method of the TV.

First Embodiment

In the digital TV according to the present invention, in the digital TV, a tuner 100 receiving a digital broadcast signal and a TP (Transport Packet) among the digital broadcast signals received by the tuner 100 are added with audio, video signals, and the like. In the TP separation unit 110 to separate the information, the audio and video decoding unit (120, 200) and the audio decoding unit 120 to decode the audio and video signals separated by the TP separation unit 110, respectively A voice processor 130 for converting the decoded digital voice signal into an analog signal, a voice output unit 140 for outputting the analog voice signal output from the voice processor 130, and an image signal color adjustment value set by the user A memory unit 320 for storing a color, an image processor 210 for performing color adjustment corresponding to the color adjustment value with respect to an image signal except for image format conversion and an OSD signal, and outputted from the image processor 210. Video signal and The display unit 220 displaying the OSD on the screen, and when the user's color adjustment value is set, the color adjustment value is stored in the memory unit 320 and transmitted to the image processor 210 to perform color adjustment. And a microcomputer 310 for outputting a control signal to the image processing unit 210.

In this case, the image processor 210 is a video display processor (VDP) having a color space converter (CSC) matrix for image format conversion and color adjustment, and the image output unit 220 does not require a deflection process. Display devices are, for example, PDP and LCD.

Referring to the image control device of the digital TV configured as described above are as follows.

As shown in FIG. 2, first, the tuner unit 100 receives a Quadrature Phase Shift Keying (QPSK) signal or a Quadrature Amplitude Modulation (QAM) signal from an antenna (not shown) to convert a TP (Transport Packet) signal sequence into a TP. Output to the separation unit 110.

At this time, the TP signal sequence is standardized in the MPEG-2 system, and a header is provided at the beginning of the packet, and the header has a PID (Packet IDentifier) number recorded therein. The PID indicates the type of the packet and analyzes the PID number to detect whether the video packet, the audio packet and the additional information packet are present.

Subsequently, the TP separation unit 110 receives the TP signal sequence received by the tuner unit 100, detects and analyzes the PID number included in the header of the signal sequence, and divides the voice signal sequence, the image signal sequence, and the additional information signal sequence according to the PID number. do. Each of the divided signal sequences, that is, the voice signal sequence, is output to the voice decoder 120, the image signal sequence is output to the image decoder 200, and the additional information signal sequence is output to the microcomputer 310.

Subsequently, the voice signal sequence is decoded into the original digital voice data through the voice decoder 120, and the decoded voice data is converted into an analog voice signal through the voice processor 130 to output a voice, such as a speaker, PCM, or SPDIF. It is output by voice 140 or sound.

On the other hand, the video signal sequence is decoded into the original digital video data through the video decoder 200.

In addition, the microcomputer 310 controls the operation of the digital TV, and the program and OSD information necessary for the microcomputer 310 are stored in the ROM 321, and temporary information necessary for the control operation of the microcomputer 310 is performed. Stored in RAM 322.

Subsequently, the micom 310 receives and recognizes a predetermined operation command input by the user through a remote controller or a main body key through the user interface unit 300, and when the operation command is an operation command requiring an OSD, The OSD is generated through the internal OSD IC. In addition, the OSD is transmitted to the image processing unit 210 together with the image data decoded from the image decoder 200 so that image processing such as image format conversion and color adjustment is performed and displayed on the display unit 220.

In this case, since the image processor 210 has a built-in format converter and a color adjustment matrix, the image data and the OSD information are variously outputted through the image processor 210 such as 480I, 480P, 720P, 1080I, and the like. The video format is converted, and the color of the video signal is adjusted without affecting the color of the OSD signal by converting the color-related matrix according to the color adjustment value of the user input.

Referring to the image control method of the digital TV configured as described above in more detail as follows.

As shown in FIG. 4, first, a user inputs a color adjustment value through a remote controller or a main body key to adjust the color of an image (S100).

In this case, the microcomputer 310 receives the color adjustment value input through the remote control or the main body key through the user interface unit 300 and adjusts an image according to the color adjustment value so that the phase value corresponds to the color adjustment value. Search for (S110).

Subsequently, the phase value corresponding to the color adjustment value input by the user and the phase value of the predetermined table are compared. If the color adjustment phase value and the phase value of the predetermined table are the same, the color-related matrix is converted according to the phase value. The color is adjusted and the image signal is implemented through the display unit 220 (S120 ~ S140).

Color conversion matrix equation of the image processing unit 210 for adjusting the color of the image is

[Y '] [coef0, coef1, coef2] [Y]

[Cb '] = [coef3, coef4, coef5] [Cb]

[Cr '] [coef6, coef7, coef8] [Cr]

Represented by

In this case, Y represents luminance, Cb represents blue, and Cr represents red, and coefficients coef0 to coef8 represent CSC (Color Space Converter) coefficients.

For example, if the input signals Y, Cb and Cr and the output signals Y ', Cb' and Cr 'are equal

[Y '] [1, 0, 0] [Y]

[Cb '] = [0, 1, 0] [Cb]

[Cr '] [0, 0, 1] [Cr]

The color of the video signal is adjusted by converting Cb and Cr. In other words,

[Cb '] = coef4 [Cb]

[Cr '] = coef8 [Cr]

It can be represented as.

Where coef4 and coef8 are

coef4 = sin (θ) * √ (Cb² + Cr²)

coef8 = cos (θ) * √ (Cb² + Cr²)

to be.

As a result, the color of the image is adjusted by adjusting the phases of sin (θ) and cos (θ).

Second Embodiment

In the digital TV according to the present invention, in the digital TV, a tuner 100 receiving a digital broadcast signal and a TP (Transport Packet) among the digital broadcast signals received by the tuner 100 are added with audio, video signals, and the like. In the TP separation unit 110 to separate the information, the audio and video decoding unit (120, 200) and the audio decoding unit 120 to decode the audio and video signals separated by the TP separation unit 110, respectively An audio processing unit 130 for converting the decoded digital audio signal into an analog signal, an audio output unit 140 for outputting the analog audio signal output from the audio processing unit 130, and an image signal color adjustment value set by the user A memory unit 320 for storing a color, an image processor 210 for performing color adjustment corresponding to the color adjustment value with respect to an image signal except for image format conversion and an OSD signal, and outputted from the image processor 210. Of video signal A deflection control unit 230 for adjusting the direction, a display unit 240 for displaying the video signal and the OSD output from the deflection processing unit 230, and the corresponding color adjustment value when setting the user's color adjustment value And a microcomputer 310 that stores the data in the memory 320 and transmits the control signal to the image processor 210 so that color adjustment is performed by transmitting to the image processor 210.

In this case, the display unit 240 is a CRT.

Referring to the image control device of the digital TV configured as described above are as follows.

As shown in FIG. 3, first, operations of the tuner 100, the TP separation unit 110, the audio decoding unit 120, the audio processing unit 130, the image decoding unit 200, and the memory unit 320 are performed. Performs the same operation as in the first embodiment.

The microcomputer 310 receives and recognizes a predetermined operation command input by the user through a remote controller or a main body key through the user interface unit 300, and when the operation command is an operation command requiring an OSD, The OSD is generated through the internal OSD IC. In addition, the OSD may be transmitted to the image processor 210 together with the image data decoded from the image decoder 200 so that image processing such as image format conversion and color adjustment may be performed, and the image may be realized through the deflection control unit 230. The display unit 240 to display the display unit 240.

In this case, the deflection control unit 230 controls the deflection of the image signal having the adjusted color information to implement the image on the display unit 240.

The image control method of the second embodiment of the digital TV configured as described above is the same as the image control method of the first embodiment.

The digital TV and image display control method according to the present invention as described above provides a Color Space Converter (CSC) matrix in controlling the color of the image so that the user inputs the color adjustment value of the image through the remote controller or the main body key. By converting the matrix, the OSD is maintained in the original color regardless of the color adjustment of the image, thereby eliminating inconveniences when using the TV.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (5)

In digital TV, A memory unit for storing a video signal color adjustment value set by a user; An image processor configured to perform color adjustment corresponding to the color adjustment value on an image signal except for image format conversion and an OSD signal; A display unit displaying an image signal and an OSD output from the image processor on a screen; And, And a microcomputer configured to store a corresponding color adjustment value in the memory unit and transmit the control signal to the image processing unit to perform color adjustment when the user adjusts the color adjustment value. The method of claim 1, The image processing unit is a digital TV, characterized in that a built-in format converter and color adjustment matrix (matrix). The method of claim 1, The display unit is a digital TV, characterized in that any one of the PDP or LCD. In digital TV, A memory unit for storing a video signal color adjustment value set by a user; An image processor configured to perform color adjustment corresponding to the color adjustment value on an image signal except for image format conversion and an OSD signal; A deflection control unit for controlling deflection of the image signal output from the image processing unit; A display unit displaying an image signal and an OSD output from the deflection processor on a screen; And, And a microcomputer configured to store a corresponding color adjustment value in the memory unit and transmit the control signal to the image processing unit to perform color adjustment when the user sets the color adjustment value. The method of claim 4, wherein The display unit is a digital TV, characterized in that the CRT.