KR19990042486A - Caption signal OSD display control device for multi-screen television - Google Patents

Abstract

According to the present invention, a multi-screen television recognizes a caption character for a caption signal detected from a video signal of a television broadcast and simultaneously converts the image of a plurality of broadcast channels through two screens into OSD display information. The present invention provides a caption signal OSD display control apparatus for a multi-screen television that enables screen display and enables screen display through the entire area of the video screen regardless of the screen area division state of the two screens.

To this end, according to the present invention, a video signal of a plurality of broadcast channels simultaneously tuned by a plurality of tuners (2, 4) is image-processed by a plurality of image processing means (14,18), thereby making a main / sub picture 36 composed of two screens. And a caption signal detecting means (24) for detecting a caption signal included in a video signal of a predetermined broadcasting channel among the video signals corresponding to the plurality of broadcasting channels, in the multi-screen television which is simultaneously reproduced through (38). Subtitle recognition means 26 for generating a character recognition code by recognizing the subtitle character of the subtitle signal detected through the detection means 24, and the character recognition code according to the subtitle character recognition result from the subtitle recognition means 26. The control means 30 which controls to display the OSD character text corresponding to the screen in place of the caption signal, and the OSD character text corresponding to the character recognition code is displayed and controlled by the control means 30. It is characterized in that it comprises an OSD signal processing means (32,34) for signal processing to display on behalf of the.

Description

Caption signal OSD display control device for multi-screen television

The present invention relates to a caption signal OSD display control device for a multi-screen television, and more particularly, to a caption character for a caption signal detected from a video signal of a television broadcast when a multi-channel TV screen is reproduced through two screens of a multi-screen television. The present invention relates to a caption signal OSD display control apparatus for a multi-screen television that converts the screen into OSD (On Screen Display) text information and displays the screen, thereby enabling a screen display of normal caption characters.

Currently, televisions generally used allow video / audio playback by selecting a predetermined channel among a plurality of television broadcasting signals transmitted from a plurality of television broadcasting stations. Subtitle data included in a video signal of such a television broadcasting is provided. A caption data processing apparatus is provided which allows caption information having a predetermined display content such as a news subtitle or a guide broadcast of a broadcast program to be displayed on a screen by extracting a signal and processing the signal.

According to a caption data processing apparatus for signal-processing such a subtitle data signal of television broadcasting, the clamp circuit unit clamps the luminance signal Y included in the video signal of television broadcasting to a predetermined level to convert it into a digital signal. And a signal converter which converts the clamped luminance signal Y into a digital signal, and receives a clock signal generated by a horizontal synchronization signal Hsync and receives a clock signal generated by a vertical synchronization signal Vsync. A caption data detector for detecting caption data by resetting the caption position signal according to a white level of the caption data, a caption data extraction section for extracting only caption data from which image noise components are removed from the detected caption data; A memory for storing the extracted subtitle data, and the stored subtitle data in the form of an analog signal. It is composed of a signal inverse converting unit for converting the signal and outputting the screen for display.

In the caption data processing apparatus of a television equipped with such a component, when the luminance signal Y clamped by a clamp circuit portion is converted into a digital signal in the form of a digital signal through the signal converting portion, the caption data detecting portion converts the digital signal. The caption data is detected by generating a caption position signal for detecting the position of the caption signal by detecting the white level in the luminance data. The caption data from which the image noise component is removed by the caption data extractor is temporarily stored in the memory. Next, a signal is converted into an analog signal through a signal inverse conversion unit and supplied to the video signal processing end.

Also, in such a television, an operation for adjusting an analog level such as volume adjustment of an audio signal, contrast adjustment of a video signal or brightness adjustment, and channel switching or on of a broadcasting channel are performed by a user. When the on / off timer reservation setting is made, an OSD display processing apparatus for implementing the function operation or setting state in the form of On-Screen Display (OSD) display characters on the CRT screen is employed. The apparatus makes it possible to simultaneously display the OSD display information generated by the OSD signal processing even when the caption data extracted from the television broadcast signal is displayed on the screen.

However, a television equipped with such a caption data processing device having a caption detection function and an OSD display processing device having an OSD display information generation function is provided with a plurality of tuners, so that images of a plurality of broadcast channels can be simultaneously reproduced through two screens. In the case of a multi-screen television, the OSD display information that can be processed inside the television can be displayed in the normal display character size, but the caption data detected from the video signal of the television broadcast is used for simultaneous reproduction of two screens. Since the data can be compressed and displayed on the screen in the same manner as the data compression state of the video signal, it is difficult to reproduce the normal character size, which makes it difficult to identify characters by the viewer.

Accordingly, the present invention has been made in view of the above circumstances, and the multi-screen television recognizes the caption characters for the caption signal detected from the video signal of the television broadcast while simultaneously playing the video of the multiple broadcast channels through the two screens. Caption signal of multi-screen television that enables screen display in normal character size by converting to OSD display information, and enables screen display through all areas of video screen regardless of screen area division status of 2 screens An object of the present invention is to provide an OSD display control device.

According to the caption signal OSD display control apparatus for a multi-screen television according to the present invention for achieving the above object, video signals of a plurality of broadcast channels simultaneously tuned by a plurality of tuners are image-processed by a plurality of image processing means. A multi-screen television which is reproduced simultaneously through a main / sub picture consisting of screens, comprising: caption signal detection means for detecting a caption signal included in a video signal of a predetermined broadcast channel among video signals according to the plurality of broadcast channels; Subtitle recognition means for generating a character recognition code by recognizing the subtitle character of the subtitle signal detected by the signal detection means, OSD character characters corresponding to the character recognition code according to the subtitle character recognition result from the subtitle recognition processing means Control means for controlling operation to display a screen in place of a signal, and display control by the control means. Instead, the OSD character letters a caption signal corresponding to the recognized code to provide a multi-screen caption signal in the television OSD display control device is configured to provided the OSD signal processing means for signal processing so that the display screen.

According to the present invention configured as described above, when a caption signal is detected from a video signal of a predetermined broadcast channel in a state in which a video corresponding to a plurality of broadcast channels on a multi-screen television is simultaneously reproduced through two screens, the corresponding caption signal Recognition of subtitle characters on the screen generates OSD display information with character information corresponding to the characters so that the screen can be displayed over the entire area of the video screen regardless of the screen partition state of the two screens.

1 is a block diagram showing a caption signal OSD display control apparatus of a multi-screen television according to the present invention;

2A and 2B illustrate a state in which a caption signal from a video signal is converted into OSD display information and displayed on two screens according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2, 4: tuner, 6, 8: video IF section,

10: multi-screen mode switching unit, 12, 16: video amplifier,

14, 18: image processing unit, 20: multi-screen synthesis unit,

22: video output unit, 24: subtitle signal detection unit,

26: caption recognition unit, 28: function setting unit,

30: control unit, 32: character memory,

34: OSD signal processing unit.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a caption signal OSD display control apparatus of a multi-screen television according to the present invention. In the apparatus of the present invention, reference numerals 2 and 4 denote the multi-screen playback mode from the controller 30, which will be described later. Receiving a plurality of channel tuning data for simultaneous tuning of a plurality of broadcasting channels, and tuning an RF signal of a corresponding broadcasting channel, and mixing with a local oscillation frequency signal generated by the respective channel tuning data. The first and second tuners to be converted into and outputted to the first and second tuners 6, 8 are intermediate frequency amplification processing of the television broadcast signals according to a plurality of broadcast channels simultaneously tuned by the first and second tuners 2 and 4, respectively. The first and second image IF portions are shown.

Also, reference numeral 10 is an optional signal for reproducing the video signal of the multiple broadcast channels through the first and second video IF units 6 and 8 as the main picture and sub picture according to the execution of the multi-screen play mode. Represents a multi-screen mode switcher that provides a path.

Further, reference numeral 12 denotes a first image amplifier which amplifies the amplified level branch signal capable of processing the image signal according to the main screen through the multi-screen mode switching unit 10, and 14 denotes the main signal amplified process. Brightness adjustment and color demodulation are performed by dividing the video signal according to the screen into the luminance signal and the color signal, and the data can be reproduced as a whole on the screen region divided on two screens by the digital conversion of the luminance signal and the color signal. A first image processing unit which performs a compression process is shown.

Reference numeral 16 denotes a second image amplifier which amplifies the video signal according to the sub-screen through the multi-screen mode switching unit 10 to an amplification level capable of image signal processing, and 18 denotes the signal amplified part. The video signal according to the screen is applied to separate the luminance signal and the color signal to perform luminance adjustment and color demodulation, and to synchronize with the synchronization signal SY separated from the image signal according to the main screen of the first image processor 14. A second image processing unit which performs data compression so that screen reproduction of the entire image region can be performed in the screen region of the sub-screen by performing digital conversion by image processing.

In addition, reference numeral 20 denotes an image synthesis process for simultaneously reproducing image signals corresponding to the main / sub picture from the first and second image processing units 14 and 18 on two screens, and a predetermined image signal. And a multi-screen synthesizer which synthesizes and outputs an OSD display information signal having OSD character letters corresponding to the subtitle characters of the subtitle signal detected from the main / sub picture, and 22 denotes a main / sub picture-processed main / sub picture. The video output unit is amplified and driven by a video signal according to a sub-screen, and has a signal output operation to enable two screens to be formed on the video screen.

Reference numeral 24 denotes a caption signal detection unit for receiving a video signal corresponding to the sub-screen from the second video amplifier 16 and detecting a caption signal included in the video signal by caption position detection operation. Denotes a caption recognition processing unit for recognizing caption characters for the caption signal detected by the caption signal detection unit 24 by a character signal pattern recognition method and generating a character recognition code according to the result.

Further, reference numeral 28 is a matrix button unit provided in a predetermined portion of the remote control remote control unit or the control panel of the main body, so that a single screen playback mode capable of playing a single screen of a video according to a single broadcast channel or simultaneous video of multiple broadcast channels A function setting section for performing key operation for selective mode switching of a multi-screen playback mode capable of two-screen playback is shown.

Further, reference numeral 30 denotes a plurality of channel tuning stations for simultaneous tuning of desired broadcast channels to the first and second tuners 2 and 4 in accordance with the execution of the multi-screen playback mode by the function setting unit 28. A control unit which generates data and performs control for selecting a broadcast channel to be reproduced between a main screen and a sub-screen by switching control of the multi-screen mode switching unit 10, wherein the control unit 30 is the subtitle. Based on the character recognition code generated according to the result of the caption recognition processing from the recognition processing section 26, a control operation is performed so as to display the screen as OSD display information by reading OSD character characters corresponding to each caption character.

Reference numeral 32 denotes a character memory in which OSD character data having an overall character pattern corresponding to the caption character of the caption signal included in the video signal of the television broadcast is stored, and 34 is displayed and controlled by the control unit 30. OSD signal processing unit for processing the OSD character data from the character memory 32 read to correspond to the caption character of the video signal according to the broadcast to generate the OSD display information for display of the character screen in place of the caption signal Indicates.

Here, the subtitle signal detected from the video signal according to the sub screen has a character size of data compression processing on a predetermined screen, that is, the sub screen 38, among the main screen 36 and the sub screen 38 as in the related art. Although the subtitle string 40 is displayed on the screen (refer to FIG. 2A), the OSD signal processing unit 34 according to the preferred embodiment of the present invention receives the synchronization signal from the video signal according to the main screen and receives the main screen 36. ) And generation of OSD display information based on the image scanning period of the sub-screen 38, as shown in FIG. 2B, irrespective of the screen division state of the main screen 36 and the sub-screen 38, as shown in FIG. The screen is displayed as an OSD string 42 having a normal character size over the lower screen area of the main screen 36 and the sub screen 38.

Next, the operation of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, the multi-screen playback mode is executed by selecting the function of the function setting unit 28, and the television broadcast signals according to the plurality of broadcast channels are simultaneously tuned through the first and the second tuners 2 and 4, so that the first and When the intermediate frequency amplification process is performed by the second video IF unit 6 and 8, and the signal path is formed as a video signal to be reproduced for the main screen and the sub-screen by the multi-screen mode switching unit 10, The image amplifier 12 amplifies the image signal according to the main screen through the multi-screen mode switching unit 10, and the first image processor 14 images the image signal according to the main screen subjected to the signal amplification processing. Signal processing is performed to compress the data to enable screen reproduction of the video signal to the entire screen area.

In addition, the second image amplifier 16 amplifies the image signal according to the sub-screen through the multi-screen mode switching unit 10, and the second image processor 18 the first image processor 14 The video signal processing is performed in synchronization with the synchronization signal separated from the video signal according to the main screen to perform data compression in the same way as the data compression state of the video signal according to the main screen. The video signals of the main and sub-screens through the first and second image processing units 14 and 18 are respectively synthesized and outputted to be simultaneously reproduced through the two screens.

In this state, the caption signal detector 24 detects the caption signal from the video signal from the second video amplifier 16 by the caption reproduction position, and the caption recognition processor 26. Recognizes the character pattern of the caption character with respect to the detected caption signal and generates a character recognition code according to the result.

Accordingly, the controller 30 receives the character recognition code from the subtitle recognition processor 26 and reads the OSD character data having the character corresponding to the character recognition code from the character memory 32, and the OSD signal processor 34 receives a synchronous signal separated from the video signal according to the main screen, determines the video scanning period of the main / subscreen, and reads out of the character memory 32 by display control by the controller 30. The OSD characterizes the OSD character data to generate OSD display information having characters corresponding to the corresponding subtitle signal, and is generated over the video scanning period of the main / sub picture regardless of the screen partition state of the main picture and sub picture.

As a result, the OSD string 42 according to the OSD display information signal signaled by the OSD signal processing unit 34 can be displayed as a whole over the bottom of the screen area of the main screen 36 and the sub-screen 38. (See FIG. 2B).

According to the present invention made as described above, in a multi-screen television capable of simultaneous playback of two screens to recognize the caption characters for the caption signal detected from the video signal of the television broadcast to display the screen as OSD display information having a normal character size As a result, it becomes possible to reproduce the subtitle signal as the normal character size, and thus has the advantage that the character identification of the viewer can be made more easily.

Claims (2)

Video signals of a plurality of broadcast channels simultaneously tuned by a plurality of tuners (2, 4) are image-processed by a plurality of image processing means (14, 18), through a main / sub picture (36,38) consisting of two screens. In multi-screen television to be played back at the same time, Caption signal detection means (24) for detecting a caption signal included in the video signal of a predetermined broadcast channel among the video signals according to the plurality of broadcast channels; Subtitle recognition processing means 26 for recognizing the subtitle character of the subtitle signal detected by the subtitle signal detection means 24 to generate a character recognition code, Control means (30) for controlling to display the OSD character characters corresponding to the character recognition codes according to the caption character recognition result from the caption recognition processing means (26) on the screen instead of the caption signal; And OSD signal processing means (32, 34) for display processing by the control means (30) to signal-process the OSD character text corresponding to the character recognition code to be displayed on behalf of the subtitle signal. OSD display control device for subtitle signal of multi-screen television. The OSD string processing apparatus according to claim 1, wherein the OSD signal processing means (32, 34) is configured to display the OSD string on the main / sub picture (36,38) regardless of the screen division state of the main / sub picture (36,38) consisting of two screens. A caption signal OSD display control apparatus for a multi-screen television, characterized in that 42 is formed to adjust the screen display period for the OSD display information.