KR20010055803A - A processing method for flickering on screen display data of the digital broadcasting receiver - Google Patents

Abstract

PURPOSE: A method for processing a blinking of on-screen display data of a digital broadcasting receiver is provided to easily appeal to users by adding a blinking function. CONSTITUTION: A palette table is formed in order to display an on-screen display on a screen. After a header and a palette are formed. a color relevant to a pixel of the on-screen display is inputted. An index relevant to the color inputted is searched from the palette table. Bitmap data of the on-screen display is formed using the index. The header, the palette table and the bitmap data are outputted and displayed on the screen after previous operations are performed up to the last pixel of the last on-screen display.

Description

A PROCESSING METHOD FOR FLICKERING ON SCREEN DISPLAY DATA OF THE DIGITAL BROADCASTING RECEIVER}

The present invention relates to a method of processing on-screen display data flicker of a digital broadcasting receiver for implementing a flicker function for a character when text information is extracted from the additional information transmitted together with video information during digital broadcasting and displayed on a screen. In particular, the present invention relates to an on-screen display data flicker processing method of a digital broadcast receiver that can be easily implemented without affecting system operation at all.

FIG. 1 is a block diagram of an on-screen display data (OSD) processing apparatus of a conventional digital broadcast receiver. As shown in FIG. 1, a tuner 1 for selecting a channel selected by a user during a broadcast received through an antenna, and The VSB demodulator 2 converts the channel signal selected by the tuner 1 into a digital transport signal sequence, detects and corrects an error included in the signal sequence, and outputs the same. Demux (3) for demultiplexing and separating audio, video, and additional information, and MPEG audio / video decoder (6) for extending and outputting the separated video and audio to original size through the demux (3). And CFI (4) for reading information for displaying the OSD on the screen from the additional information separated by the demux (3), and for the letters or icons to display the OSD on the screen. An OSD-only ROM (5) storing bitmap data, an OSD processing unit (7) for processing and outputting text data provided by the OSD-only ROM (5), and the MPEG audio / video decoder ( 6) The audio output unit 8 converts the audio data output from the audio data into analog audio signals R and L, and outputs the video data output from the MPEG audio / video decoder 6 to the OSD processing unit 7. It is composed of an image output unit (9) for inserting and outputting the OSD data output from.

Looking at the prior art configured as described above is as follows.

The system standard is a regulation on a transport stream packet which is a time-multiplexed signal sequence.

The transport stream signal is composed of a 188 byte packet, and the signal can be roughly divided into a header part and a payload part.

The header portion contains information indicating the start of a signal and a PID (Packet IDentifier) number indicating which signal is a signal on the payload portion.

The payload portion contains video information, audio information, and additional information to be transmitted. The PID number provides a means for demultiplexing a time multiplexed signal. The PID number can identify whether the current packet is a video packet, an audio packet, or a service information packet (SI). .

The video and audio standards specify the compressed video and audio signal sequences.

Video, audio, and other additional information are time-multiplexed and carried in multiple transport stream packets. These signal sequences are also distinguished by PID numbers.

When a broadcast signal is received through the antenna shown in FIG. 1, the tuner 1 selects a channel signal desired by the user from the received broadcast signal and provides the channel signal to the VSB demodulator 2.

The VSB demodulator 2 then converts the analog channel signal into a digital MPEG transport stream and provides it to the demux 3.

Accordingly, the demux 3 demultiplexes the delivered MPEG transport stream into a video stream, an audio stream, and an additional information stream under the control of CPI 4, and the video stream and the audio stream are MPEG audio. / Video decoder 6, the additional information stream is passed through another filter to the CIF (4).

The MPEG audio / video decoder 6 then decompresses and decompresses the MPEG compressed audio stream and the video stream, and provides the audio stream to the audio output unit 8 to convert the analog audio signals R and L to output them. The video stream is provided to the video output unit 9.

At this time, the CPI 4 checks whether there is an OSD display request (step S201 in FIG. 2).

As a result of the check, if there is an OSD display request, CPI 4 reads the character to be displayed from the additional information transmitted from the demux 3 (S202), and the position on the OSD-only ROM 5 with respect to the read character. Find out the information (step S202).

Then, after selecting a background color and a text color (step S204), the CPI 4 uses the bitmap of the text stored in the OSD-only ROM 5 to display the text on the OSD. Column, and select the internal register already defined (S205), and the address (where the bitmap data of the character is located on the OSD ROM) and the attribute (background color and text color) to be displayed on the selected internal register. (WRITE) (S206).

When the register for which the address and the attribute are written in the OSD-only ROM 5 is provided to the OSD processing unit 7, the OSD processing unit 7 processes the on-screen display data (OSD) and outputs it to the image output unit 9. do.

Accordingly, the image output unit 9 mixes the image stretched and reconstructed by the MPEG audio / video decoder 6 and the OSD image processed by the OSD processor 7 so that the OSD is displayed on the image.

However, in the prior art as described above, there is a problem in that the number of characters that can be displayed on the screen is limited depending on the size of the OSD-only ROM or the size of the characters, if the background color or the color of the OSD is similar to the color of the image. There is a problem that the user can recognize well.

Accordingly, an object of the present invention to solve the conventional problems as described above is to provide a method for processing on-screen display data flicker of the digital broadcast receiver to add a flicker function to appeal to the user more easily.

Another object of the present invention is to provide an on-screen display data flicker processing method of a digital broadcast receiver to easily implement a flicker function.

1 is a block diagram of an on-screen display data (OSD) processing apparatus of a conventional digital broadcast receiver.

2 is a flowchart illustrating an on-screen display data processing method of a conventional digital broadcasting receiver.

3 is a block diagram of an on-screen display data flicker processing apparatus of the present invention digital broadcast receiver.

Figure 4 is a first embodiment of the on-screen display data flicker processing method of the digital broadcast receiver of the present invention.

5 is a schematic diagram of an on-screen display data (OSD) structure in FIG.

6 is a second embodiment of the on-screen display data flicker processing method of the digital broadcast receiver of the present invention.

FIG. 7 is an explanatory diagram showing an embodiment of blinking according to FIG. 6; FIG.

***** Explanation of symbols for the main parts of the drawing *****

101: Tuner 102: VSB Demodulator

103: modulator 104: CPI

105: memory 106: MPEG audio / video decoder

107: video output unit 108: audio output unit

The present invention for achieving the above object is a first step of configuring a header, color information (Palette) table to display the on-screen display (OSD), and after configuring the header and color information of the on-screen display (OSD) A second step of receiving a color for one pixel; a third step of finding an index for the color received in the second step from the color information table of the first step; and an index of the third step. A fourth step of configuring bitmap data for the on-screen display (OSD), and performing the operation to the last pixel of the last on-screen display (OSD), and outputting a header, a color information table, and bitmap data. And a fifth step of displaying OSD data on the screen.

Hereinafter, with reference to the accompanying drawings in detail as follows.

FIG. 3 is a block diagram of a general digital broadcast receiver. As shown in FIG. 3, a tuner 101 for selecting a channel selected by a user during broadcasting received through an antenna, and a channel signal selected through the tuner 101 Converts to an MPEG compressed video / audio stream, and detects and corrects an error included in the stream, outputs the VSB demodulator 102, and a demux for restoring the error-corrected MPEG compressed video / audio stream. 103, an MPEG audio / video decoder 106 for outputting a synthesized MPEG video / audio stream reconstructed through the demux 103 and subtitle data transmitted as additional information, and the demux 103; Extracts the necessary information from the MPEG compressed video / audio stream reconstructed through < RTI ID = 0.0 >), < / RTI > and stores the necessary data under the control of the CFI oil 104. The memory 105, a video output unit 107 for receiving video data among the signals synthesized by the decoder and converting the video data into NTSC video signals (R / G / B, Y / C, CVS) for output. The audio output unit 108 converts the audio data among the signals synthesized by the decoder 106 into analog audio signals R and L and outputs the audio output unit 108.

4 is a first embodiment of a method for processing an on-screen display of a conventional digital broadcasting receiver. As shown in FIG. 4, a header and a color table are displayed to display an on-screen display (OSD) on a screen. A first step of configuring, a second step of receiving a color for one pixel of an on-screen display (OSD) after configuring a header and color information, and an index of the color received in the second step of the first step. A third step of searching from a color information table; a fourth step of configuring bitmap data for an on-screen display (OSD) by using the index of the third step; and performing the last on-screen display (OSD) operation. After performing the last pixel of), a fifth step of displaying the OSD data on the screen by outputting the header, the color information table, and the bitmap data is performed.

6 is a second embodiment of the on-screen display data flicker processing method of the digital broadcast receiver of the present invention. As shown in FIG. 6, a header for generating on-screen display (OSD) data on a screen is provided. A first step, a second step of configuring two first and second pallet tables to perform a flickering function, a third step of receiving a color for one pixel of the on-screen display (OSD) data to be displayed on the screen; A fourth step of finding an index of the color received from the first and second palette tables, a fifth step of configuring bitmap data using the index found in the fourth step, and the third step A sixth step of finalizing the structure of the bitmap data by finding the index of the last data of the on-screen display (OSD) data of the on-screen display (OSD) data; The seventh step of outputting the data to be displayed on the screen, the eighth step of inspecting the currently used pallet after waiting for a predetermined time to realize the flickering function, and if the currently used pallet is the first pallet, the second pallet is changed to In the second pallet, the ninth step is performed to change the color of the on-screen display (OSD) displayed on the screen by changing to the first pallet.

Referring to the operation and effect of the present invention configured as described in detail as follows.

The demultiplexer of the tuner 101, the VSB demodulator 102, and the demux 103 is separated into digital MPEG audio, video streams and additional information streams.

The MPEG compressed video / audio stream of the separated stream is transmitted to the MPEG audio / video decoder 106, and the additional information stream is passed to the CIF 104 through another section filter.

Then, the CPI 104 stores the additional information stream filtered through the filter in the memory 105 as information to be displayed by the graphical user interface (GUI).

In this case, the MPEG audio / video decoder 106 decompresses and restores the MPEG compressed video / audio stream received from the demux 103 and provides the audio output unit 108 to the audio output unit 108. The reconstructed digital stream is output by analog audio signals R and L, and the video output unit 107 outputs the video stream to NTSC video signals, that is, R / G / B, Y / C and CVBS. Output by encoding with.

As digital broadcasting is performed, various additional information is processed by the receiver. Accordingly, character information such as electronic broadcast guide (EPG), digital caption (DCC), and teletext information is displayed on the screen, based on FIG. 4 and FIG. 5. Looking at it as follows.

In order to present an on-screen display (OSD), the CPI 104 stores a stream of additional information separated by the demux 103 in the memory 105 and extracts information therefrom to indicate a location on the screen. (Header), a palette showing the color information to be used is created (S201).

The header portion includes information such as a position value on the screen of the on-screen display (OSD), a size (SIZE), a next on-screen display header pointer, and the like on a palette. There are 256 color tables used to display screen display (OSD) data.

As described above, the CPI 104 creates a header and a palette and receives a color of one pixel of the on-screen display (OSD).

The index for the color input in step S202 is found from the palette table created in step S201.

Bitmap data is constructed using the index found from the pallet table (S204).

The operation as described above takes the color of the last pixel of the on-screen display (OSD) to form a bitmap (S205).

The structure of the header, palette, and bitmap formed by such a process is as shown in FIG. 3 (a), and the header is shown in FIG. 3 (b). Similarly, there are OSD coordinates on the screen, OSD size, the next header pointer of the OSD, etc. The palette has 256 colors as shown in FIG. 3C, and the colors are defined for each index. Y is the luminance component, and Cb and Cr are the color components.

In the bitmap (Bitmap), as shown in Fig. 3D, the data to be displayed on the actual screen is constituted, and the bitmap data is configured using the color table defined in the color information table. In FIG. 3D, the letter “T” is shown as an example.

In this way, when the data structure of the bitmap is completed for the last pixel of the on-screen display (OSD), CPI 104 transfers the header, pallet, and bitmap data to the image output unit 107 in a direct memory access (DMA) manner. (S206)

The on-screen display data (OSD) displayed on the image is then displayed on the screen.

As the broadcasting method is switched from analog broadcasting to digital broadcasting, more information is required to be displayed on the screen, and a flickering function is needed to inform the user of more important information. An example is the flickering of important information in the broadcast guide and the flickering function in digital captions.

Using a high-performance video output chip with the same function as above will solve the problem, but it will affect the unit cost.

Therefore, the bitmap data as shown in FIG.

The user will feel as if a certain part is blinking on the screen.

However, in this case, the larger the bitmap to be displayed on the screen, the more time is spent inputting data to the image output unit.

Therefore, in consideration of this point, two palettes are configured, and when a bitmap is created and output using the same, the flicker function is implemented by changing the color to a palette that is not currently used, and FIG. 6 and FIG. Based on 7, it is as follows.

If there is a request to display the on-screen display data (OSD) on the screen, the CPI 104 extracts information from the additional information stream stored in the memory 105 to create an on-screen display data header (OSD DATA HEADER). (In FIG. 6, S401)

The header HEAD indicates coordinate values, sizes, and the like on the screen where the on-screen display OSD is located.

After the header is written, two pallet tables are created to perform the flickering function (S402).

Two pallet tables, that is, a first pallet table and a second pallet table, are constructed as shown in FIG.

That is, the first palette table Palette 1 lists the same colors on the horizontal axis and different colors on the vertical axis. The second palette table (Palette 2) lists the same color on the vertical axis and different colors on the horizontal axis.

At this time, the index value increases on the horizontal axis and increases when the index value changes to the vertical axis.

In FIG. 7A, "R" represents Red (red) among the (R, 0) values, and "0" represents an index.

In this way, after constructing two pallet tables in consideration of flickering, the characters to be displayed are read from the additional information stored in the memory 105 (S403), and color is displayed one pixel at a time in order to display them as on-screen display data (OSD). (S404)

Thereafter, a new index value is found using the first palette table (Palette 1) and the second palette table (Palette 2) with respect to the input color (S405).

R = 0, G = 1, B = 2 are index values for Red, Green, and Blue. The new index values are obtained as follows.

New index value = (index value for existing color) * (number of full colors) + (index of color converted at blink)

For example, red turns blue when the flashing function is performed.

New index value = 0 (index value for red) * 3 (number of red) + 2 (index value in blue)

= 2

In the above, the first palette represents the original color when blinking, and the second palette represents the color that each color of the first palette should change when the blinking is performed.

The bitmap data for one character is constructed using the newly obtained index value in step S405.

Subsequently, the color of one pixel of the on-screen display data (OSD) is received and bitmap data is obtained using the first palette and the second palette.

This operation is repeated to obtain the bitmap data by performing the last data of the on-screen display (OSD) (S407).

In this way, the CPI 104 outputs the header, the first palette, and the bitmap data of the on-screen display data OSD until the data is output to the OSD register of the image output unit 107. (S408)

Then, on-screen display (OSD) data having an index as shown in FIG. 7B is in a square with a blue background, as shown in FIG. 7C, and the upper half of the center is red, and the lower half is green. The picture with the circle will appear on the screen.

After that, wait 0.5 seconds to implement the flickering function (S409).

Next, it is checked whether the currently used pallet is the first pallet or the second pallet (S410).

As a result of the inspection, if the currently used pallet is the first pallet (Palette 1), it is changed to the second pallet (Palette 2) (S411), and if the currently used pallet is the second pallet (Palette 2), the first pallet (Palette 1) (S412)

This changes the color of the on-screen display (OSD) that appears on the screen, making it easy to blink.

In the present invention, for example, the on-screen display (OSD) shown in (c) of FIG. 7 using the first palette is exported to the image output unit 107, so after 0.5 seconds to change to the second palette (Palette 2). As shown in (d) of FIG.

In addition, if it is determined whether to finish the flashing and continue to realize the blinking function, the process proceeds to step S409, waits 0.5 seconds again, changes the pallet, and ends the process if it is desired to terminate the process (S413).

As described above, in order to display on-screen display (OSD) data on the screen, configure two palettes, and configure bitmap data for the on-screen display (OSD) data using one palette and export it to the image output unit. After display for a certain period of time, change the color using another pallet and make the screen flicker.

As a result, the screen flickering function is added by simply changing the color so that it can be easily implemented without affecting the system operation at all.

As described in detail above, the present invention emphasizes when displaying text information or icons on a screen in a digital broadcasting providing various services, or a flicker function is required for a function sphere (digital caption). After configuring two palettes, one palette configures bitmap data for on-screen display (OSD) data and exports them to the video output for display on the screen. By implementing, there is an effect that it can be easily implemented without affecting the system operation at all.

Claims (3)

A first step of configuring a header and a color information table to display an on-screen display (OSD), and receiving a color for one pixel of the on-screen display (OSD) after configuring the header and color information Step 2, the third step to find the index for the color input in the second step from the color information table of the first step, and the on-screen display (OSD) by using the index of the third step A fourth step of constructing bitmap data for the display; and performing the operation to the last pixel of the last on-screen display (OSD), and outputting a header, a color information table, and bitmap data to display the OSD data on the screen. On-screen display data flicker processing method of the digital broadcast receiver, characterized in that consisting of five steps. A first step of creating a header for displaying on-screen display (OSD) data; a second step of configuring two first and second pallet tables to perform a flickering function; and an on-screen to be displayed on the screen A third step of receiving a color for one pixel of display (OSD) data; a fourth step of finding an index of the received color from the first and second pallet tables; and an index found in the fourth step A fifth step of constructing the bitmap data using the method, a sixth step of finding the index of the last data of the on-screen display (OSD) data of the third step, and finishing the configuration of the bitmap data; , Step 7 to output the pallet table and the bitmap data to appear on the screen, and step 8 to check the currently used pallet after waiting a predetermined time to implement the flickering function If the currently used palette is the first palette, the second palette is changed, and if the second palette is changed to the first palette, the ninth step of changing the color of the on-screen display (OSD) displayed on the screen, characterized in that it comprises a How to handle flicker on screen display of digital broadcast receiver. The digital broadcasting according to claim 2, wherein one pallet is arranged to arrange the same color on the horizontal axis and the other color on the vertical axis, and the other pallet is arranged to arrange another color on the horizontal axis and the same color on the vertical axis. How to handle flickering on-screen display of receiver.