KR100242588B1 - Color matching control apparatus of main and sub picture - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub picture color matching device of a television, and the sub picture color matching control is performed based on the color difference of the main picture / sub picture video IF signal of the channel tuned by the first and second tuners 16 and 18. And a first and second digital converters 32 and 34 which are activated under the control of the controller 12 and digitally convert the main / sub picture image IF signal. First and second color separators 36 and 38 for separating color components from the main / sub-screen image IF signal, a luminance separator 40 for separating the luminance component from the digitally-converted sub-screen image IF signal; A synthesis unit 42 and a synthesis unit 42 for synthesizing the luminance components of the sub-screen image IF signals into color components of the main screen image IF signal separated by the first color separation unit 36. The PIP processing unit 24 performs an analog conversion process on the color compensated sub-screen image IF signal. An analog converter 44 for applying and a comparison unit 46 for generating a difference between the color components separated by the first and second color separators 36 and applying the difference to the controller; The sub-screen color matching process is performed only when the color difference is determined by the comparing unit 46 while the same channel is set by the first and second tuners 16 and 18.

Description

Sub-screen color matching device of television

The present invention relates to a sub-screen color matching device of a television, and more particularly, to a sub-screen of a television for processing to match colors of a main screen and a sub-screen of the same channel during automatic channel searching in a two-tuner television. It relates to a color matching device.

As is well known, in the case of a television having only a single tuner, only video / audio broadcasted on the current channel can be reproduced. Therefore, for example, in order to check the broadcasting status of other channels, it is necessary to switch channels each time. Hassle is caused.

In view of such a situation, recently, a two-tuner television has been proposed in which a so-called 'picture-in-picture (PIP) function' can check the broadcasting status of other channels even while watching the current channel. It is a state.

1 is a block diagram schematically illustrating an image processing system of a general two-tuner television. Reference numeral 10 denotes a remote for selecting an overall function including, for example, an automatic channel search function added to a two-tuner television. 12 represents a remote controller for generating a control command, and 12 represents a control unit for controlling the execution of, for example, an automatic channel search function in a two-tuner television in response to the remote control command generated from the remote controller 10, 14 is 2 Indicates a tuning data memory in which tuning data for all channels that can be tuned in a tuner-type television is registered.

16 and 18 are first and second tuners which perform tuning of a channel corresponding to tuning data VT1; VT2 applied under the control of the control unit 12. For example, the first tuner 16 is a normal main screen. The second tuner 18 is applied to the tuning of the channel related to the sub-screen when the automatic channel search function is executed or the PIP function is performed on the remote controller 10, for example. The main / sub picture tuning functions of the first and second channels are executed in exchange according to the setting state of the remote controller 10.

20 and 22 are provided to correspond to the first and second tuners 16 and 18 to convert the broadcast signals of the channels tuned by the tuners 16 and 18 into predetermined intermediate frequencies IF. And a second video IF module, and 24 denotes, for example, a PIP processing unit for reducing the video IF signal provided from the second video IF module 22 to a sub-screen when the PIP function is set by the second tuner 18. Indicates.

Reference numeral 26 denotes a playback process of an image IF signal provided from the first image IF module 20 when the PIP function is not set, or an image IF signal provided by the first image IF module 20 when the PIP function is set. In addition to the main screen, the PIP processing signal applied by the PIP processing unit 24 is displayed as a sub picture, and an image processing unit which performs playback processing, and 28 denotes a CRT apparatus 30 for processing the video signal processed by the image processing unit 26. The video output unit is displayed to be displayed on the sub-picture area 30a in the CRT apparatus 30 when a PIP function is set, for example, a channel selected by the second tuner 18.

According to such a two-tuner television, when a remote control command for tuning a specific channel only is applied to the control unit 12 without the PIP function being set, for example, by the remote controller 10, the control unit 12 selects a station. The tuning data VT1 of the target channel is read from the tuning data memory 14 and applied to the first tuner 16. The broadcasting signal of the channel tuned by the first tuner 16 is the first image. As the conversion processing by the predetermined intermediate frequency is performed in the IF module 20, an image IF signal is obtained and applied to the image processing unit 26. Then, the image processor 26 reproduces the image IF signal applied from the first image IF module 20 to be displayed on the CRT device 30 through the image output unit 28.

In this state, when the PIP function is set by the remote controller 10 and tuning of a specific channel is performed, the control unit 12 selects the tuning data VT2 corresponding to the channel to be tuned into the tuning data memory. The read signal from 14 is applied to the second tuner 18, and accordingly, a broadcast signal of a channel tuned by the second tuner 18 is applied to the second video IF module 22, and thus, a predetermined intermediate point. As the conversion process by frequency is performed, the video IF signal is obtained. The image IF signal is reduced by the PIP processing unit 24 into a sub picture form and applied to the image processing unit 26. Accordingly, the image processing unit 26 is connected to the channel tuned by the first tuner 16. The PIP screen is formed by synthesizing the sub-screen video signal processed by the PIP processing section 24 with the video signal. The PIP screen is displayed on the CRT device 30 through the image output unit 28. In the CRT device 30, the image of the channel selected by the first tuner 16 is displayed as the main screen. In this state, the image of the channel tuned by the second tuner 18 is displayed on the sub picture area 30a.

When a specific channel is tuned by the first tuner 16 and a video signal is reproduced, the control unit 12 sets an automatic channel search function for confirming a broadcasting state of another channel from the remote controller 10. ) Sequentially reads the tuning data VT2 for all channels tuneable to the second tuner 18 to the second tuner 18 and applies the second tuner 18 to the second tuner 18. The broadcast signals of the channels sequentially tuned at are processed in the sub picture form by the second image IF module 22 and the PIP processing unit 24 and are applied to the image processing unit 26. Is displayed on the CRT device 30 through the image output unit 28. In the sub-screen area 30a of the CRT device 30, all the channels (preferably memory channels) are sequentially displayed. Will be displayed on other channels. A check is made possible.

However, when the automatic channel search mode is set, for example, by the remote controller 10 in the two-tuner television shown in FIG. 1, the stations are sequentially tuned to the second tuner 18 under the control of the controller 12. When the data VT2 is applied, images of all channels (or memory channels) are sequentially displayed in the sub picture area 30a of the CRT apparatus 30. In that case, the first tuner 16 and the second tuner are displayed. By 18, even if the same channel is selected and displayed on the main picture and the sub picture, disadvantages in that the colors do not coincide with each other as the processing paths of the main picture and the sub picture are different.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a two-tuner television, when the first tuner and the second tuner tune in the same channel and are displayed on the main screen and the sub-screen on the CRT apparatus, the image to be displayed on the main screen It is an object of the present invention to provide a sub-screen color matching device of a television for color processing of an image displayed on a sub-screen by color signals separated from to prevent a color difference between a main screen and a sub-screen for the same channel.

In order to achieve the above object, according to a preferred embodiment of the present invention, the first and second tuners for tuning of the main picture / sub picture channel and a main picture / sub picture image IF signal corresponding to the tuner are provided. PIP processing unit for PIP screening the video IF signal of the first and second video IF modules, the second video IF module, and video for synthesizing and processing the main screen video IF signal and the sub-screen video IF signal processed by the PIP screen. A television comprising a processing unit, comprising: a control unit which performs sub-screen color matching control based on a color difference of a main screen / sub-screen video IF signal of a channel tuned by the first and second tuners; First and second digital conversion units activated to digitally convert the main / sub picture image IF signal, and first and second color separations to separate color components from the digitally converted main / sub picture image IF signal. injury A luminance separation unit for separating luminance components from the digitally-converted sub-screen image IF signal, and synthesizing the luminance components of the sub-screen image IF signals into color components of the main-screen image IF signal separated by the first color separation unit An analog converter which converts the color-compensated sub-screen image IF signal synthesized by the synthesizer to the PIP processing unit 24 by applying an analog conversion process, and the first and second color separation units 36. There is provided a sub-screen color matching device for a television comprising a comparison unit for generating a difference of separated color components and applying it to the control unit.

Preferably, the controller includes a control to perform sub-screen color matching processing only when the color difference is determined by the comparator in the state where the same channel is set by the first and second tuners.

According to the sub picture color matching device of the present invention having the above-described configuration, when the first and second tuners tune to the same channel and are simultaneously displayed on the main picture and the sub picture of the CRT device, the color signal of the main picture is displayed. The color difference of the main picture / sub picture of the same channel is excluded by reproducing the color of the sub picture based on.

1 is a block diagram schematically illustrating an image processing system of a general two-tuner television.

2 is a block diagram showing the configuration of a sub picture color matching device according to the present invention applied to the television shown in FIG. 1;

3 is a flowchart illustrating the operation of the sub-screen color matching device of the television according to the present invention.

* Explanation of symbols for main parts of the drawings

10: remote control, 12: control unit,

14: tuning data memory, 16, 18: tuner,

20,22: video IF module, 24: PIP processing unit,

26 is an image processor, 28 is an image output unit,

30: CRT device, 30, 32: digital conversion unit,

34,36: color separation unit, 40: synthesis unit,

42: analog converter.

Next, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a sub-screen color matching device of a television according to a preferred embodiment of the present invention, wherein 12 is a control unit for controlling the overall function of a corresponding television in response to a remote control signal transmitted from a remote controller. When the same channel is tuned by the first and second tuners, the control unit 12 is also in charge of controlling to perform the reproduction processing of the sub picture video signal by the main picture color. 24 is a PIP processing unit for compressing an image to be displayed on the sub-screen of the CRT apparatus when the PIP function or the channel search function is set by the remote controller, and 26 is a playback process of the main screen and sub-screens by the main screen image or the PIP function. To display the image processing unit to be displayed on the CRT apparatus. 32 is the first channel corresponding to the first tuner 16 that is activated by the digital conversion control signal ADS1 from the control unit 12 when the same channel is tuned by the first and second tuners 16 and 18. A first digital conversion unit for digitally converting the main screen image IF signal PIFM provided from the image IF module 20 is shown. 34 denotes that the same channel is tuned by the first and second tuners 16 and 18. A digital conversion of the sub picture image IF signal PIFS, which is activated by the digital conversion control signal ADS2 from the control unit 12 and provided by the second image IF module 22 corresponding to the second tuner 18. 2 shows a digital conversion part.

36 denotes a first color separator that separates color components of the main screen image signal digitally converted by the first digital converter 32, and 38 denotes a subscreen image digitally converted by the second digital converter 34. A second color separation unit for separating the color components of the signal, 40 represents a luminance separation unit for separating the luminance component of the sub-screen image signal digitally converted by the second digital conversion unit 34, 42 is the luminance separation unit A synthesizer for synthesizing the luminance component of the sub-screen video signal provided by 40 and the color component of the main screen video signal provided by the first color separation unit 42. In addition, 44 denotes an analog converting unit for generating a sub-screen video signal PIFs' by analog-converting the sub-screen video signal synthesized by the synthesizing unit 44, and 46 denotes the first color separation unit 36. A comparison unit for generating a difference signal by comparing the color components of the separated main screen image signal with the color components of the sub screen image signal separated by the second color separation unit 38, and applying the difference signal to the controller 12, If the same channel is tuned by the first and second tuners, the controller 12 displays the difference between the color components of the main and sub-screens of the same channel from the comparator 46. The sub picture video signals PIFs' (the signal whose color components are compensated by the color components of the main picture video signal) converted by the analog converter 44 are applied by the PIP function. Playback with sub picture signal It is to.

Next, the operation of the sub-screen color matching device of the television having the above-described configuration will be described in detail with reference to the flowchart of FIG.

First, when only a single channel is designated by the remote controller 10 as the tuning target, tuning operation by the first tuner 16 is controlled under the control of the control unit 12 based on the process described with reference to FIG. 1. As a result, the CRT device 30 reproduces the image of the selected channel.

When the channel search function of the step 50, for example, by the PIP function is set in the state where tuning of a specific channel is performed by the first tuner 16, the control unit 12 performs the first step for processing the PIP screen in step 52. And digital conversion control signals ADS1 and ADS2 are applied to the second digital conversion units 32 and 34, so that the main screen image IF signal PIFm is digitally converted by the first digital conversion unit 32. It is applied to the color separator 36 to separate the color components. In addition, the sub-screen image IF signals PIFs are digitally converted by the second digital converter 34 and then applied to the color separator 38 to separate color components. In addition, the sub-screen image IF signals PIFs digitally converted by the second digital converter 34 are applied to the luminance separator 40 to separate luminance components.

Therefore, the luminance component Y of the sub-screen image IF signal separated by the luminance separator 40 is applied to the combining unit 42 and applied to the main screen image IF signal applied by the first color separator 36. The sub-picture image IF signal synthesized with the color components of the sub-picture image IF signal is applied to the analog converter 44 to be converted into an analog signal and compensated for by the main picture color. Is applied to (24).

Meanwhile, color components of the main / sub picture image IF signal separated by the first and second color separators 36 are applied to the comparator 46 to provide the first and second tuners 16 and 18. ) Generates a color level difference between the main picture video IF signal and the sub picture video IF signal at the timing at which the same channel is tuned, and applies it to the controller 12.

Therefore, in step 54, the controller 12 determines whether the colors of the main screen image IF signal and the sub-screen image IF signal of the same channel match with each other, and match the second image IF with respect to the PIP processing unit 24 when they match. Sub-picture image IF signals (PIFs) applied from the module 22 are compressed to a PIP screen and applied to the image processing unit 26. Accordingly, the first tuner 16 is applied to the main screen of the CRT apparatus 30. The image of the channel by the second channel 18 is displayed on the sub-screen area 30a of the CRT apparatus 30.

On the other hand, if it is determined in step 54 that the color of the main screen image IF signal and the sub-screen image IF signal do not match in the tuned state of the same channel by the output of the comparison unit 46, the process proceeds to step 56 The control signal CS is applied to the PIP processing unit 24 to compress the color-compensated sub-screen image IF signals PIFs' applied from the analog conversion unit 44 to the PIP screen. Accordingly, the PIP processing unit 24 PIP-processes the sub-screen image IF signals PIFs' color-compensated by the main screen color component and applies the PIP processing to the image processing unit 26. Accordingly, the image processing unit 26 ) Is reproduced to be displayed on the CRT apparatus 30 so that the colors of the video signals to be displayed on the main screen and the sub-screen are matched while the same channel is tuned by the first and second tuners 16 and 18 (step). 58 and step 60).

The main / sub picture color matching process is performed under the control of the controller 12 when the first and second tuners 16 and 18 are shifted to a timing of selecting different channels. 2, the digital conversion unit 32, 34 is changed to the inactive state, the execution is stopped.

On the other hand, while the present invention has been described an example in which the first and second tuners only operate when the same channel is tuned in the two-tuner television, the channel tuned by the first and second tuners if necessary. It may be made to work properly even when the color level of the device shows a significant difference.

As described above, according to the sub-screen color matching device of the present invention, when the first and second tuners tune to the same channel under the PIP function, if a difference occurs by comparing the color levels of the main screen and the sub-screen, By synthesizing the sub-screen luminance components with the main screen color components, the color difference between the main screen video signal and the sub-screen video signal can be compensated for, thereby preventing deterioration of the viewing due to the color difference of the same channel.

Claims (2)

First and second tuners 16 and 18 for tuning of a main picture / sub picture channel and first and second pictures providing a main picture / sub picture picture IF signal corresponding to the tuners 16 and 18. An IF module (20, 22), a PIP processing unit (24) for PIP processing the image IF signal of the second image IF module (22), the main screen image IF signal and the PIP screen processed sub-screen image IF signal In a television comprising an image processing unit 26 for performing synthetic reproduction processing, A control unit 12 for performing sub-screen color matching control based on the color difference between the main screen / sub-screen video IF signals of the channels tuned by the first and second tuners 16 and 18; First and second digital conversion units 32 and 34 activated under the control of the control unit 12 to digitally convert the main / sub picture image IF signal; First and second color separators 36 and 38 for separating color components from the digitally converted main / sub picture IF signal; A luminance separator 40 for separating luminance components from the digitally converted sub-screen image IF signal; A combining unit 42 for synthesizing the luminance component of the sub-screen image IF signal into the color component of the main-screen image IF signal separated by the first color separation unit 36; An analog converter 44 for converting the color-compensated sub-screen image IF signal synthesized by the combiner 42 into the PIP processor 24 by performing an analog conversion process; And a comparator (46) for generating a difference between the color components separated by the first and second color separators (36) and applying the difference to the controller. The sub-screen color according to claim 1, wherein the controller 12 determines the color difference by the comparator 46 when the same channel is set by the first and second tuners 16 and 18. A sub picture color matching device for a television, comprising: a control for performing a matching process.

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