KR19980034756A - Video playback device with color adjustment for OSD (ON-SCREEN DISPLAY) characters - Google Patents

Abstract

The present invention relates to an image reproducing apparatus for detecting an R / G / B signal from a composite image signal from a video signal source and then regenerating the R / G / B signal to reproduce a predetermined image through a video output device, The present invention relates to an image reproducing apparatus having a color adjusting function for an OSD character so that the OSD character can be easily recognized by adaptively adjusting the color and brightness of the OSD character outputted to the image reproducing apparatus to the surrounding color, A video reproduction apparatus for detecting and reproducing a video signal from a composite video signal input from a source, comprising: a luminance signal (Y) and a color signal (C) separated by a Y / C separation unit (14) And a color adjustment process for the OSD character based on the luminance signal (Y ') and the color signal (C') output from the two frame delay stage (34) OSD A control unit 32 for controlling the entire apparatus to generate OSD characters corresponding to the functions set by the control signal input unit 10, a character memory 22 under the control of the control unit 32, An OSD control unit 24 for reading a character code for OSD character generation and applying the read character code to the control unit 32 and an OSD selection signal SEL from the control unit 32, The first and second multiplexers 38 and 38 for performing a switching operation on the luminance / color signal Y / C from the OSD color adjusting stage 36 and the luminance / color signal Y _OSD / C _OSD from the OSD color adjusting stages 36 and 40, 42), and a luminance / color signal output in accordance with a switching result of the first and second multiplexers (38, 42) And an RGB decoder 44 for detecting an R / G / B signal to be reproduced through the video output device 30 so that the OSD character is differentiated from the surrounding color so that the OSD The character can be correctly recognized.

Description

Video playback device with color adjustment for OSD (ON-SCREEN DISPLAY) characters

The present invention relates to an image reproducing apparatus having a color adjusting function for an OSD character, and more particularly, to an image reproducing apparatus for detecting an R / G / B signal from a composite video signal from a video signal source, The OSD character can be easily recognized by adjusting the color and luminance of the OSD character outputted on the video reproducing device adaptively to the surrounding color in the video reproducing device for reproducing the predetermined video through the video output device And a color adjustment function for an OSD character.

FIG. 1 is a block diagram of an OSD processing apparatus in a conventional video reproducing apparatus, with reference to FIG. 1. Referring to FIG.

1, reference numeral 10 denotes a control signal input unit for the user to arbitrarily set a specific function of the image reproducing apparatus with respect to the function of the image reproducing apparatus, 12 denotes a control signal input unit 10 The control unit 12 controls the entire device to perform a corresponding function set by the horizontal synchronization signal Hsync / vertical synchronization signal Vsync applied from the synchronization separator 20 to be described later When a predetermined function is set by the control signal input unit 10, the OSD processing unit 20, which will be described later, displays an OSD (On Scrnen Display) character as character information for displaying the function on the video output device, (DATA) and an address signal (AD) to generate a specific OSD character from the OSD processing unit (20).

Reference numeral 14 denotes a Y / C separator for separating the luminance signal Y and the color signal C from the input composite video signal, and 16 denotes a luminance signal (luminance signal) output from the Y / C separator 14 (RY, BY) and a luminance signal (Y) on the basis of the chrominance signals (RY, BY) and the color signal (C) And outputs the R / G / B signals as the primary color signals by synthesizing the luminance signals Y, respectively.

Reference numeral 20 denotes a synchronization separator for separating the horizontal synchronous signal Hsync and the vertical synchronous signal Vync from the composite video signal CVS and 22 denotes a synchronous separator for separating the control signal input from the control signal input unit 10 24 is a character memory for reading a predetermined character code from the character memory 22 under the control of the control unit 12 so that the read character code is applied to the OSD decoder 26 26 denotes an analog-to-digital converter for analog-converting the character code applied from the OSD controller 24 based on the horizontal / vertical synchronizing signal supplied from the sync separator 20, and outputs an R / G / B signal To the OSD decoder.

Reference numeral 28 denotes a switch for performing R / G / B signals from the RGB matrix 18 and R / G / B signals from the OSD decoder 26, B multiplexer 28. When the R / G / B signal is inputted from the OSD decoder 26, the far multiplexer 28 performs a switching operation so that the R / G / B signal for the OSD character is output do.

Therefore, in the OSD processing apparatus in the video reproducing apparatus having the above configuration, when the composite video signal input from the video signal source is input to the Y / C separating unit 14, the Y / The chroma decoder 16 separates the luminance signal Y and the color signal C from the composite video signal and outputs the luminance signal Y and the color signal C to the chroma decoder 16. In the chroma decoder 16, (RY, BY) and the luminance signal (Y) based on the signal (Y) and the color signal (C) and outputs the color difference signals RY, BY and the luminance signal .

In this state, when a user inputs a predetermined control signal to set a specific function through the control signal input unit 10, the control unit 12 performs an operation corresponding to the corresponding control signal, A predetermined data signal DATA and an address signal AD are applied to the OSD control unit 24 so that a character code for a specific OSD character stored in the character memory 22 is read by the OSD control unit 24. [

The OSD control unit 24 which has read the character code from the character memory 22 by the control unit 12 applies the corresponding character code to the OSD decoder 26 and the OSD decoder 26 And then applies the R / G / B signal for the OSD character to the multiplexer 28 based on the horizontal / vertical sync signal from the sync separator 20.

The R / G / B signals output from the RGB matrix 18 and the R / G / B signals output from the OSD decoder 26 are applied to the multiplexer 28. In the multiplexer 28, G / B signals from the OSD processing unit 20 when the R / G / B signals output from the RGB matrix 18 are switched and output, So that predetermined video signals and OSD characters are output onto the video output device 30. [

However, in the OSD processing apparatus of the video reproducing apparatus described above, since the R / G / B signal for the OSD character outputted from the OSD processing unit 20 is always set to a constant color signal, The OSD character reproduced by the R / G / B signal to be output is influenced by the surrounding color in which the OSD character is displayed, and the degree of recognition is determined.

That is, when the surrounding color of the OSD character and the color of the OSD character are the same series of colors, the boundary of the OSD character is unclear, and it is difficult for the user to correctly identify the OSD character.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and apparatus for detecting an R / G / B signal from a composite video signal from a video signal source, A video reproducing apparatus for reproducing a predetermined video, the apparatus comprising: a color adjustment unit for adjusting the color and brightness of an OSD character outputted to the video reproducing apparatus so as to adaptively adjust the color and brightness of the OSD character to a surrounding color, To a video reproducing apparatus having a function.

According to an aspect of the present invention, there is provided an image reproducing apparatus for detecting and reproducing a video signal from a composite video signal input from a video signal source, the video reproducing apparatus comprising: Based on the luminance signal Y 'and the color signal C' output from the two-frame delay stage and a two-frame delay stage for delaying the color signal Y and the color signal C by two frames for color adjustment of OSD characters, An OSD color adjustment step for performing a color adjustment process for the OSD character; a control unit for controlling the entire device to generate an OSD character corresponding to the function set by the control signal input unit; (Y / C) from the Y / C separation unit based on the OSD select signal SEL from the control unit, and a control unit Group luminance / color signal first and second multiplexers, and the luminance / color signal outputted according to the switching result of the first and second multiplexers to perform a switching operation for the (Y _OSD / C _OSD) from the OSD color adjustment stage ( synthesizing a Y ₀ / C ₀₎ to the image playback device equipped with a color adjustment function for the OSD character composed including RGB decoder for detecting the R / G / B signal to be reproduced through the video display apparatus is provided.

According to the image reproducing apparatus having the color adjusting function for the OSD character according to the embodiment of the present invention configured as described above, the luminance of the peripheral region in which the OSD character to be displayed is displayed is compared with the reference luminance level, When the luminance of the OSD character is lower than the reference luminance, the luminance of the OSD character is set to the " low " level when the luminance of the OSD character is lower than the reference luminance, By processing the color of the OSD character so that the color and the complementary color are processed, the OSD character can always have a distinctive color from the surrounding color in which the OSD character is displayed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a video reproducing apparatus having a conventional OSD display function;

2 is a block diagram of an image reproducing apparatus having a color adjusting function for an OSD character according to an exemplary embodiment of the present invention;

3 is a signal waveform diagram for explaining a luminance signal Y for color adjustment of an OSD character in the image reproducing apparatus shown in FIG. 2,

FIG. 4 is a signal waveform diagram for explaining a color signal C for color adjustment of an OSD character in the image reproducing apparatus shown in FIG. 2. FIG.

Description of the Related Art [0002]

10: control signal input unit, 12,32: control unit,

14: Y / C separation unit, 16: chroma decoder,

18: an RGB matrix, 20: a synchronization separator,

22: character memory, 24: OSD control unit,

26: OSD decoder, 28: multiplexer,

30: video output device, 34: 2 frame delay stage,

36: comparator, 36: first multiplexer,

40: phase inversion section, 42: second multiplexer,

44: RGB decoder.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of an image reproducing apparatus having a color adjusting function for OSD characters according to an embodiment of the present invention. Referring to FIG. 2, components similar to those of FIG. And a detailed description thereof will be omitted.

2, the OSD control unit 24 controls the OSD control unit 24 so that OSD characters corresponding to the control signals are generated in response to a control signal input from the control signal input unit 10, The control unit 32 receives a predetermined character code read out from the character memory 22 from the OSD control unit 24 in accordance with the present invention and supplies the data signal DATA1 and the address signal AD to the OSD control unit 24. [ The OSD select signal SEL for the character code is applied to the first multiplexer 38 and the second multiplexer 42 to be described later on the basis of the horizontal / vertical sync signal from the sync separator 20.

Reference numeral 34 delays the luminance signal Y and the color signal C from the Y / C separator 14 by two frames to generate a delay between the original video signal and the OSD signal, Frame delay stage 36 for comparing the luminance signal Y 'output from the two-frame delay stage 34 with the reference voltage (Y _{MAX / 2} = 0.5 Vpp) And outputs a predetermined brightness level signal (Y _OSD ) for adjusting the brightness of the OSD character with respect to the surrounding color of the Y / C (Y / C) based on the OSD select signal (SEL) And performs a fast switching operation on the luminance signal Y applied from the separator 14 and the luminance level signal Y _OSD output from the comparator.

Reference numeral 40 denotes a phase inverting unit for performing a complementary process on the color of the OSD character with respect to the color of the surrounding color by inverting the phase of the color signal C 'output from the 2 frame delay stage 34, on the basis of the OSD select signal (SEL) from the controller 32, the phase-applied color from a color signal (C _OSD) and the Y / C separation unit 14 for applying the OSD characters and a half of all 40 Is a second multiplexer that performs a fast switching operation on signal C.

Reference numeral 44 denotes a multiplexer for multiplexing the luminance signal Y ₀ output by the switching operation of the first multiplexer 38 and the color signal C ₀ output by the switching operation of the second multiplexer 42 A CRT (Cathode Ray Tube) or an LCD (Liquid Crystal) for reproducing and outputting the R, G and B signals output from the RGB decoder 44. Reference numeral 30 denotes an RGB decoder for detecting R / Display) and AMA panel (Actuated Mirror Array Panel).

Next, the operation of the image reproducing apparatus having the color adjusting function for OSD characters according to the embodiment of the present invention will be described in detail with reference to the signal waveform diagrams shown in FIGS. 3 and 4 .

First, a composite video signal from a video signal source is applied to a Y / C separator 14, separated into a luminance signal Y and a color signal C, and then applied to the first multiplexer 38, 2 < / RTI >

At the same time, the luminance signal Y and the color signal C output from the Y / C separation unit 14 are also applied to the two frame delay stages 34. In the second frame delay stage 34, A luminance signal Y 'having a signal waveform as shown in Figs. 3A and 4A and a color signal Y' having a signal waveform shown in Figs. 3A and 4A are generated by delaying the luminance signal Y and the color signal C by two frames, C 'to the comparator 36 and the phase inverting unit 40, respectively.

The luminance signal Y 'is input to the (-) terminal of the comparator 36 and is compared with 0.5V _PP set as the reference voltage to the (+) terminal of the comparator 36, and the luminance level Y' And outputs a signal. That is, as shown in (c) of FIG. 3, when the luminance signal Y ' The luminance signal of the " low " level signal Level signal when the luminance signal Y 'is equal to or lower than the reference voltage, .

At the same time, the color signal C 'output from the two-frame delay stage 34 is applied to the phase inverting unit 40 to be inverted in phase, and the phase inverted color signal (See FIG. 4 (c)) is applied to the second multiplexer 42.

The first multiplexer 38 and the second multiplexer 42 are connected to the Y / C separator 14 in a period in which the OSD select signal SEL is not applied from the controller 32 Performs a high-speed switching operation on the luminance signal (Y) and the color signal (C) And a color signal To the RGB decoder (44), and the RGB decoder (44) applies the luminance signal And a color signal The R / G / B signal is detected by applying the R / G / B signal to the video output device 30 so that only the original video that does not display the OSD characters through the video output device 30 Is displayed.

If the user inputs a predetermined control signal from the control signal input unit 10 to the control unit 32 by operating a predetermined key provided in the control signal input unit 10, And generates a predetermined data signal DATA1 and an address signal AD based on the horizontal / vertical synchronizing signal supplied from the separator 20 and supplies the data signal DATA1 and the address signal AD to the OSD control unit 24).

The OSD control unit 24 outputs a character code DATA2 corresponding to the OSD character corresponding to the control signal input from the control signal input unit 10 based on the data signal DATA1 and the address AD, And reads the data from the memory 22 and then applies the data signal DATA3 corresponding to the character code to the control unit 32. [

Then, the control unit 32 generates an OSD select signal (OSD) signal for displaying an OSD character based on the data signal DATA3 applied from the OSD control unit 24 and the horizontal / vertical synchronization signal supplied from the sync separation unit 20 The first multiplexer 38 and the second multiplexer 42 receive the OSD selector signal SEL (see FIGS. 3 (b) and 4 (b) The multiplexer 38 and the second multiplexer 42 receive the luminance signal < RTI ID = 0.0 > And the color signal applied from the phase inverting unit 40 Lt; / RTI >

3 (e), the luminance signal Y ₀ output from the first multiplexer 38 is supplied to the comparator (not shown) during a period in which the OSD select signal SEL is applied from the controller 32 36, And is a luminance signal Y output from the Y / C separator 14 during a period in which the OSD select signal SEL is not applied from the controller 32, When the luminance of the OSD character is equal to or higher than the reference voltage, the luminance of the OSD character is set to the low level, and when the luminance of the surrounding color is lower than the reference voltage, the luminance of the OSD character becomes the high level, .

At the same time, the second multiplexer 42 outputs the color signal As shown in FIG. 3 (e), when the OSD select signal SEL is applied from the controller 32, the color signal output from the phase inverting unit 40 And is the color signal C output from the Y / C separator 14 during a period in which the OSD select signal SEL is not applied from the controller 32.

Therefore, since the phase of the color signal C is inverted with respect to the area where the OSD character is displayed, the OSD character is complementary to the surrounding color of the area in which the OSD character is displayed.

As described above, according to the image reproducing apparatus having the color adjusting function for the OSD character according to the embodiment of the present invention, the R / G / B signal is detected from the composite image signal from the image signal source, B signal and reproduces a predetermined image through a video output device. The image reproducing apparatus reproduces a luminance signal (Y) and a color signal (C) of the OSD character in response to an ambient color in which an OSD character is displayed, So that the OSD character can be recognized accurately at all times.

Claims (3)

A video reproducing apparatus for detecting and reproducing a video signal from a composite video signal inputted from a video signal source, A two frame delay stage 34 for delaying the luminance signal Y and the color signal C separated by the Y / C separator 14 by two frames for color adjustment of OSD characters, OSD color adjustment stages 36 and 40 for performing color adjustment processing for the OSD character based on the luminance signal Y 'and the color signal C' output from the 2 frame delay stage 34, A control unit 32 for controlling the entire apparatus to generate an OSD character corresponding to the function set by the control signal input unit 10, An OSD control unit 24 for reading a character code for generating an OSD character in the character memory 22 under the control of the control unit 32 and applying the read character code to the control unit 32, The luminance / color signal Y / C from the Y / C separation unit 14 and the luminance from the OSD color adjustment stages 36 and 40 based on the OSD select signal SEL from the control unit 32 A first and a second multiplexer 38, 42 for performing a switching operation on a color signal Y _OSD / C _OSD , The R / G / B signals to be reproduced through the image output device 30 are detected by combining the luminance / color signals Y ₀ / C ₀ outputted according to the switching result of the first and second multiplexers 38 and 42 And an RGB decoder (44) for performing color adjustment on an OSD character. The method of claim 1, wherein the OSD color adjustment stages (36, 40) compare the luminance signal (Y ') output from the two frame delay stage (34) with a reference voltage, and Y _OSD) comparator 36 for outputting, to a color signal (C ') a phase shift to all phase inverter which outputs a color control signal (C _OSD) (40) output from the two-frame delay stage 34 And a color adjustment function for OSD characters. 3. The image reproducing apparatus of claim 2, wherein the reference voltage corresponds to Y _{MAX / 2} [V].