KR20070111283A - Method for processing digital image of digital television - Google Patents

Abstract

A method for processing an image of a digital television set is provided to divide a horizontal section, compare current image quality with improved image quality and process images by dividing current image quality and the improved image quality, thereby performing image improvement while confirming improvement processes. A method for processing an image of a digital television set comprises the following steps of: determining whether a mode is an image quality demo mode; inputting 1 or 2 of picture setting value for improving image quality when the mode is an image quality demo mode; counting pixel clocks as the number of horizontal pixel between horizontal synchronization signals after inputting the 1 or 2 of picture setting value; and performing image improvement by applying the 1 of picture setting value in half section of the number of horizontal pixel and performing image improvement by applying the 2 of picture setting value in the remaining section and displaying the performed results.

Description

Image processing method of digital television {METHOD FOR PROCESSING DIGITAL IMAGE OF DIGITAL TELEVISION}

1 is a block diagram showing the configuration of a general digital television receiver.

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

3 is a graph showing the signal state in the horizontal section of the digital television according to the present invention.

   -Explanation of symbols for the main parts of the drawings-

1: antenna 2: tuner

3: IF amplification unit 4: P / S separation unit

5: voice detector 6: image detector

7: remote control unit 8: receiving unit

9 microprocessor 10 voice processing unit

11: voice amplifier 12: speaker

13: A / D converter 14: Image information management unit

15: Image information storage unit 16: Digital image control unit

17: image processing unit 18: D / A converter

19: CRT drive unit 20: CRT

The present invention relates to an image processing method of a digital television. More particularly, the present invention relates to an image processing method of digital television. The present invention relates to an image processing method of a digital television capable of performing image quality improvement while checking a process to be improved by separating and processing an image.

The digitalization of information spread from the computer industry to the information and communication industry has recently been extended to television broadcast signals. Digitization of television broadcast signals will realize a two-way multimedia era in which a new paradigm that is fused with technology in the computer and communication fields is realized.

As digital broadcasting technology continues to be commercialized, DTV broadcasting air waves are transmitted to the home, and digital broadcasting receivers are diversifying, including integrated sets and separate set-tops.

Digital TV differs from the existing analog broadcasting in that there are numerous progresses such as channel coding method and various additional services, but in terms of AV, which is the ultimate goal of TV, expanded audio channels and high resolution video quality can be seen.

In particular, HD (High Definition) class digital programs realize high quality image reproducibility of about 5 times the resolution.

The set top for digital TV reception outputs various video signal formats such as high definition (HD) components, standard definition (SD) components, and existing analog composite video signals.

In the video output format, HD class mainly supports two color coordinate systems, YPbPr component signal with sync component Y and RGB Hsync / Vsync with horizontal vertical sync component separated, and two output resolutions of HD 1080i and HD 720p. Support.

In addition, down conversion to 480p and 480i, corresponding to the existing SD class, maintains compatibility with currently available displays.

In addition, in terms of sound quality, conventional analog TVs provide only two channels of stereo sound, while digital TVs using AC3 technology provide 5.1-channel stereo sound that can be enjoyed in a theater.

In contrast to the aspect ratio of the conventional analog TV is 4: 3, digital TV is based on a widescreen 16: 9 aspect ratio, the same as the theater screen.

On the other hand, what distinguishes digital TV from analog TV is not only a dramatic change in quality and sound quality. Digital TVs are data compatible with serial interfaces implemented via IEEE 1394 interface technology, such as digital versatile disc (DVD) players, digital camcorders, and digital VCRs that process digital signals as well as PCs.

Therefore, digitalization of broadcast signal will accelerate the convergence of communication, computer, and broadcasting due to the spread of media using the compressor method, and will be internationalized and multi-channel as a single media with complex functions. Above all, introducing a digital system to a broadcast signal can provide various data services that could not be realized in analog. In addition, the digitization of the broadcast signal may be performed by multiplexing and transmitting information in the vertical retrace period of the TV video signal or by using a separate channel, such as character information, image information, product information, and broadcast program information for a television or computer owner (aka electronic). Data broadcasting, which is a new media service providing multimedia information such as an electronic program guide (EPG), may be implemented.

1 is a block diagram showing the configuration of a general digital television receiver.

As shown here, the tuner 2 generates and outputs a predetermined intermediate frequency signal from the broadcast signal received through the antenna 1, and the IF amplifier unit amplifies the intermediate frequency signal output through the tuner 2 ( 3) and a P / S separation unit 4 which separates the video intermediate frequency signal PIF and the audio intermediate frequency signal SIF from the broadcasting intermediate frequency signal output from the IF amplifier 3, for example, a surface acoustic wave filter. Is made of.

Then, the microprocessor 9 for the voice detector 5 for detecting the voice signal from the voice intermediate frequency signal output from the P / S separation unit 4, and the voice signal output from the voice detector 5 According to the control signal from the voice processing unit 10 for performing voice processing such as bass, treble, volume, etc., and the amplified voice signal processed by the voice processing unit 10, the speaker 12 It consists of a voice amplifier 11 for outputting.

Also, the video detector 6 detects a video signal from the video intermediate frequency signal output from the P / S separation unit 4, and converts the analog video signal output from the video detector 6 into a digital video signal. The control signal of the microprocessor 9 for the analog-to-digital converter 13 to output, the video information storage 15 for storing the digital video signal, and the digital video signal output from the analog-to-digital converter 13. The digital image output through the image information management unit 14 and the image information management unit 14 for sequentially storing the image information storage unit 15 in a predetermined unit based on the control signal of the microprocessor 9 A digital image adjusting unit 16 for processing a still image function or a zooming function with respect to a video signal stored in the signal or the image information storing unit 15, and a digital output from the digital image adjusting unit 16. Color, Tint, Brightness, etc. are processed according to the control signal from the microprocessor 9 with respect to the full image signal and corresponding R (Red), G (Green), B (Blue) ) Converts the digital image signal output from the image processing unit 17 and the image processing unit 17 to generate the luminance (-Y) signal and output it according to the horizontal / vertical synchronization signal (H / V Sync). CRT driver for driving the CRT 20 based on the hue signal (R, G, B) and the luminance (-Y) signal output from the digital / analog converter 18 and the digital / analog converter 18 outputting It consists of 19.

On the other hand, the remote control device 7 for remotely instructing the overall operation of the television receiver, the receiving unit 8 for converting and outputting an infrared signal output from the remote control device 7 into an electric code signal, and the entire television receiver. It consists of a microprocessor (9) for controlling.

In the digital television configured as described above, the video signal of the broadcast signal received through the antenna 1 is converted into a digital signal, image processed, and then converted into an analog signal and output to the CRT 20.

The optimal adjustment point depends on the type of program being received when performing image correction and quality improvement to display the best screen for the output image. In other words, the viewing environment of the image and the sound should be changed according to the program type such as news, movie, concert, sports, etc. so that it can be viewed optimally.

Accordingly, the television has various TV viewing option adjustment modes for adjusting the video and audio states and setting various additional functions in the optimal state for each type of program.

As an example, the image adjustment mode may include a mode for smoothly viewing the image quality, a mode for clearly viewing the image quality, and a mode for viewing the standard image, and the user may determine an adjustment point such as brightness, contrast, color, and sharpness. There is a user mode that can.

Next, the voice control mode includes a mode for listening to news, a mode for listening to music, a sound mode for watching a movie, a sound mode for watching sports, and the like. There is a user mode that can be set.

However, when the image quality improvement is performed as described above, since the screen viewed by the user only sees the improved screen on which the quality improvement has been performed, it is difficult to determine the effect of how much the improvement has been made, and to compare the image quality before and after the improvement, The data before improvement and the data after improvement must be inputted alternately to judge, but the independent viewers have a problem in that they can not accurately grasp what parts are improved and how they are improved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to divide the horizontal section into two parts to improve the current image quality and the improved image quality, respectively. The present invention provides an image processing method of a digital television that can perform image quality improvement while checking a process of improving image quality by separating image quality.

According to an aspect of the present invention, there is provided a video processing method of a digital television comprising an image processing unit for improving an image quality of an input image according to a control signal of a microprocessor. Determining whether the image is in the demo mode In the demo mode, receiving the picture setting values 1 and 2 to improve the picture quality, and receiving the picture setting values 1 and 2, counting the number of pixels in the horizontal line between the horizontal sync signals as the pixel clock. In the step of counting the pixel clock, half of the horizontal line number of pixels is displayed by applying picture setting value 1 to improve image quality, and the remaining area after half is applied to picture setting value 2 to improve image quality. Characterized in that it comprises a display step.

In the present invention, the count is received by counting the horizontal synchronization signal and the pixel clock from the image processing unit is characterized in that the half-division state is performed in the PLD outputting the microprocessor.

In the present invention, any one of the picture setting values 1 and 2 is a picture setting value of the current picture quality.

In the present invention, the number of horizontal line pixels and the pixel clock are 2200 and 74.25 MHz in the case of 1080i / 720p.

In this case, the pixel clock may be a sampling clock of the image processor.

According to the present invention, in the image quality demo mode, the input picture setting values 1 and 2 are applied to the horizontal line signal in the range of horizontal synchronization signals, and half the number of horizontal line pixels is applied to the picture setting value 1 to improve and display the other half. The picture quality is improved and displayed by applying the picture setting value 2 so that one screen is divided into two, so that the picture quality improvement screen by the picture setting value 1 and the picture quality improvement screen by the picture setting value 2 can be compared with each other.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, and the same parts as in the prior art use the same reference numerals and names. In addition, this embodiment is not intended to limit the scope of the present invention, it is presented by way of example only and those skilled in the art will be able to many modifications within the technical spirit of the present invention.

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

First, in the digital television including the image processing unit 17 which improves the image quality of the input image according to the control signal of the microprocessor 9, has entered the image quality demo mode for comparing the improved image quality for the image quality improvement? Determine (S10).

In this case, if the image quality mode has not been entered, the image quality is displayed at the current state (S12).

However, when entering the image quality demo mode, picture setting values 1 and 2 of image quality to be compared with each other are received (S14).

At this time, any one of the picture setting values 1 and 2 is a picture setting value of the current picture quality so that the difference can be compared by comparing the current picture quality with the picture quality to be improved.

After receiving the picture setting values 1 and 2 of the image quality as described above, the horizontal synchronization signal is detected for image display (S16).

When the horizontal synchronizing signal is detected, the count Y starts from the pixel clock from this point, and the total number N of horizontal lines is counted (S18).

At this time, the pixel clock is 74.25 MHz as the sampling clock of the image processing unit when the screen of the television is processed at 1080i / 720p, and when the pixel clock is sampled, the total number of pixels N of the horizontal lines is 2200.

Such counting is performed by counting the horizontal synchronizing signal and the pixel clock from the image processing unit 17 and performing a half-division state in a programmable logic device (PLD) outputting the microprocessor 9.

That is, as shown in FIG. 3, in order to identify the half section in the horizontal section by the horizontal synchronous signal, the picture setting value is changed by determining the half section based on the point counted up to half while counting the total number of pixels. (S22) (S24).

Therefore, in order to display a screen to which two picture setting values are applied to one screen, the horizontal line half is counted as a pixel clock so that the picture setting value 1 is applied and the other half section is counted as a pixel clock to apply the picture setting value 2 to the horizontal line. The image quality is improved and displayed by applying the picture setting value 1 up to half the number of pixels N, and the image quality is improved by applying the picture setting value 2 while counting up to the horizontal number of pixels N after the half period. Display (S26) (S28) (S30).

In this way, the image-processed screen is displayed on one side of the screen to which the picture setting value 1 is applied and the other side of the screen to the picture setting value 2 is displayed so that the change due to the improvement of the image quality can be easily recognized.

As described above, the present invention confirms a process of improving the image quality by dividing the current image quality and the improved image quality by dividing the horizontal section so that the current image quality and the improved image quality can be compared when performing the image quality improvement on the digital television. While improving image quality, there is an advantage that the image quality can be easily improved.

Claims (4)

In the image processing method of a digital television comprising an image processing unit for improving the image quality of the input image in accordance with the control signal of the microprocessor, Determining whether the image is in demo mode, Determining whether the image quality demo mode is input and receiving picture setting values 1 and 2 to improve the image quality in the image quality demo mode; Counting the pixel clock by the number of horizontal pixels between the horizontal synchronization signal after receiving the picture setting values 1 and 2; In the pixel clock counting, the half interval of the number of horizontal pixels is displayed by performing picture quality improvement by applying the picture setting value 1, and the remaining section after the half area is displayed by performing picture quality improvement by applying the picture setting value 2. step Image processing method of a digital television comprising a. The image processing method according to claim 1, wherein the counting is performed by counting a horizontal synchronization signal and a pixel clock from the image processing unit and counting a half section in a PLD outputting the microprocessor. . The image processing method of claim 1, wherein the number of horizontal pixels and the pixel clock are 2200 and 74.25 MHz in the case of 1080i / 720p. The method of claim 3, wherein the pixel clock is a sampling clock of the image processor.

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