KR0172499B1 - The assignment method of a sub-memory for a sub-image production apparatus - Google Patents

Abstract

The present invention relates to a sub-picture reproducing apparatus for displaying a sub-picture together with a main image on the screen. For this purpose, the sub-picture memory divides the color information assigned to each pixel of the sub-picture data and all the data about the mixing ratio into the sub-picture memory. The sub-image is mixed with the main image according to the color information and the mixing ratio given under the control of the controller and outputted after being allocated. Accordingly, the main image and the sub image of different formats can be simultaneously displayed on one screen, and various images can be expressed.

Description

Sub-Video Playback Apparatus and Area Allocation Method of Sub-Video Memory

1 is a block diagram of a sub-picture playback apparatus according to the present invention.

2 is a data structure diagram of sub-picture data recorded on a recording medium.

3 is an example of the case where sub-picture memory is allocated according to the present invention.

4 is a data configuration diagram of bitmap data according to the present invention.

5 is a flowchart illustrating an operation of sequentially allocating a region of a sub-image memory according to the present invention.

* Explanation of symbols for main parts of the drawings

10: control unit 20: data processing unit

30: audio processor 40: video processor

50: sub-image processing unit

The present invention relates to an apparatus for reproducing sub-images having a different format from the main image. Particularly, the sub-images are reproduced to mix and output the sub-images to the main image according to the color information and blending ratio provided for each pixel of the sub-image data. An apparatus and an area allocation method of a sub-image memory therefor.

In order to express a wider variety of images, a study is performed to display digital image signals (hereinafter referred to as sub-pictures) of other formats as well as to reproduce digital image signals (hereinafter, referred to as main images) in a general format. Is being tried. This is to display two types of images on one screen at the same time, even if the format of the image data is different, and it is possible to effectively display the appropriate image data according to the characteristics of the images. Will appear. Through this, the user can not only understand the screen contents more easily, but also obtain the effect of refreshing the screen composition.

An object of the present invention is to control the processing path so that the decoding operation can be performed individually for each data detected by the recording medium, and the color information and the mixing ratio of the video data of the primary image and the sub-image that have been processed first are assigned to each pixel. According to the present invention, there is provided a sub-picture reproducing apparatus that can be displayed on a screen according to the present invention.

Another object of the present invention is to separate the general data such as position data, bitmap data, variable data, etc., which designates a display area for displaying a sub-picture according to the color information and blending ratio of each sub-picture data. A method of allocating a region of a sub-image memory to be stored is provided.

An object of the present invention as described above includes a data processor for preprocessing predetermined data, an audio processor for decoding preprocessed audio data, and a video processor for decoding data of a preprocessed main image. An apparatus for reproducing a data, comprising: a system memory for controlling a processing path of preprocessed data and storing basic data and standard color information of a sub-picture for overall control, and additional data inherent in the sub-picture; Control means for outputting information on the display area and the blending ratio of the sub-image by interpreting the? And a sub-image memory for storing information about the display area and the mixing ratio supplied from the controller, and sub-image data preprocessed by the data processor, and outputting the mixed image with the main image supplied from the video processor. Achieved by the processing means.

Another object of the present invention as described above is in the method for allocating sub-image memory for storing sub-picture data consisting of a header, pixel data and table data in a separate form, the size information and position of the pre-processed sub-picture data. Parsing header and table data of the sub-picture to find information; And storing the result data according to the analysis in the sub-image memory.

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

In describing the sub-image reproducing apparatus of the present invention, since the operation of detecting data in a recording medium such as a disk is a well-known technique, a description thereof will be omitted, and a description will be given for each process by reading the data. do.

1 is a block diagram of a sub-image reproducing apparatus according to the present invention. As shown, the present invention includes a data processor 21 for reading and pre-processing data stored in a recording medium. The data once read is stored in the input memory 22. Since the data processor 21 modulates the data read from the input memory 22, the data processor 21 assists the data and then performs error correction. At this time, the data processor 21 performs a processing operation by transmitting and receiving a control signal and a signal related to a processing state through a bus under the control of the microprocessor unit (MPU) 11.

The data preprocessed by the data processor 21 is subsequently processed for each kind under the control of the MPU 11. That is, the MPU 11 controls the read data to be applied to the audio decoder 31 when the audio data is applied, and to the video decoder 41 when the video data for the main video is applied, and the video data for the sub-picture is negative. Control to be applied to the image processor 51.

In this data processing process, the MPU 11 analyzes additional data added to pure data such as audio and video, finds out details including the type of data, and controls the data processing path based on the data.

On the other hand, the audio decoder 31 stores the audio data supplied from the data processor 21 in the audio memory 32, and decodes and outputs the audio data stored in the audio memory 32 under the control of the MPU 11. . The video decoder 41 stores the video data supplied from the data processor 21 in the video memory 42, and decodes the video data of the main video stored in the video memory 42 under the control of the MPU 11 to perform sub video. Output to the processing unit 51.

The sub-image processing unit 51 stores the sub-picture data collected from the data processing unit 21 in the sub-image memory 52, and the video data of the main image decoded by the video decoder 41 and the sub-image memory. The video data of the sub-image stored in (52) is mixed and output.

In order to play a sub-image having a different format from the main image, the MPU 11 analyzes the sub-image data, and designates an area to be displayed on the screen or mixes the ratio with the main image according to the analysis result. 51).

In order to help understanding, the sub image data will be described in detail with reference to FIG. 2. 2 is a data configuration diagram of sub-picture data recorded on a recording medium. As shown, the sub-picture data includes a header, pixel data, and table data. Here, the header represents general information about the sub-picture, and the pixel data is variable-length encoded data as actual compressed sub-picture data. The table data is additional data representing the mixing ratio between the color information of the sub-picture data and the main video, and is composed of a plurality of tables having data on display time and display control command of each pixel.

In order to reproduce the sub-picture data having such a data structure, the MPU 11 first interprets the header and the table data of the sub-picture. This is to find out the size information of the sub-picture data. The pixel data of the sub image can be interpreted.

Next, the sub-image memory 52 controls the MPU 11 to display sub-picture data with the main video data and to output the sub-picture data together with the main video data at a desired position on the screen. Save it to Subsequently, when the sub-image processing unit 51 outputs the sub-image mixed with the main image under the control of the MPU 11, one screen can be displayed at the same time.

To this end, the sub-image memory 52 is allocated to five areas for storing predetermined data, and such an example is shown in FIG. 3.

In FIG. 3, the first area is an area in which location data specifying a display area of sub-picture data located on the screen is stored, and is divided into four small areas. The small area stores the start position data Start_X on the horizontal side, the start position data Start_Y on the vertical side, the end position data End_X on the horizontal side, and the end position data End_Y on the vertical side, respectively. The data are obtained by the MPU 11 interpreting the sub picture data.

After storing the position data in the first area of the sub-image memory 52, the MPU 11 reads the sample color information stored in the system memory 12 and supplies it to the sub-image memory 52. This sample color information is stored in the second area of the sub-image memory 52, and all 16 sample color information corresponding to 16 colors are stored. This main color information is read from the recording medium and stored in advance in the system memory 12 by the MPU 11. Each of the 16 sample color information stored in the second area has its own color, and its data structure consists of 8-bit luminance data (Y) representing brightness and 8-bit first chroma data (color concentration). Cr) and second chroma data (Cb).

After recording 16 kinds of sample color information in the second area, variables related to bitmap data are recorded in the third area and the fourth area, and the memory area selection variable (Memory_Num) is stored in the third area. In the fourth area, screen display variables Dispay_On / Off are stored. The memory region selection variable Memory_Num is for designating a memory region of a fifth region in which bitmap data is to be written, since the fifth region is divided into a first memory region and a second memory region. The screen display variable (Display_On / Off) is for specifying whether to output the bitmap data of the fifth region.

The memory area selection variable Memory_Num and the screen display variable Display_On / Off stored in the third area and the fourth area are respectively output from the controller 10.

Meanwhile, the bitlab data to be actually displayed is stored in the fifth area, specifically, the first memory area or the second memory area, and the selection is determined by the memory area selection variable Memory_Num. The basic data structure of the bitmap data is shown in FIG. As shown in FIG. 4, the bitmap data is formed of 8 bits as a basic unit. The upper 4 bits mean color information for designating the color of each pixel, and designate one color among 16 sample color information stored in the second area. The lower four bits are color mixing information (Blending) for specifying the blending ratio with the main image. This color mixing information (Blending) is information indicating the ratio of the sub-image to the main image, the displacement of which is 0 to 16. For example, when the color mixing information (Blending) is 0, it indicates that there is no sub-picture mixed in the main image, and eventually only the main image is outputted. On the other hand, as the color blending information (Blending) is close to 16, the sub-image mixed with the main image increases, and the sub-image is displayed together with the main image on the screen according to the given blending information.

As described above, the fifth region is divided into two regions, and the bitmap data stored in the other memory region can be outputted while the bitmap data is stored in one memory region. In the embodiment, the sizes of the first and second memory areas are the same, and the two memory areas may be alternately used depending on the purpose.

The above-described area allocation process for the sub-image memory 52 will be described with reference to FIG. 5 by summarizing the MPU 11. First, if the data preprocessed by the data processor 21 is sub-picture data, the MPU 11 analyzes the header and table data to obtain size information of the sub-picture (step 101). The pixel data is analyzed based on the size information obtained in step 101 (step 102). Subsequently, the MPU 11 stores the position data according to the analysis result in the first area (step 103). Subsequently, the MPU 11 stores the sample color information read from the system memory 12 in the second area (step 104). Subsequently, the third region stores the memory region selection variable Memory_Num and the display display variables Display_On / Off in the fourth region, respectively (step 105). Subsequently, bitmap data is stored in the first memory area or the second memory area designated by the memory area selection variable Memory_Num (step 106).

Subsequently, the sub-image processing unit 51 reads out the bitmap data stored in the sub-image memory 52, decodes the data using the position data and the color information related thereto, and then outputs the mixed image with the main image supplied from the video decoder 41. In this case, the main image and the sub image are simultaneously displayed on the screen according to the mixing ratio assigned to the bitmap data.

According to the present invention, a technique of displaying a sub-picture together with a main image can be widely applied to a device for reproducing a video signal such as a digital video disc player (DVDP), a personal PC, a high-definition television (HDTV), and the like.

As described above, the present invention properly stores the sub-picture data and related data in the attached memory in order to reproduce the sub-pictures having different formats from the main video, and displays the screen according to the already-decoded main video and the set mixing ratio. As it can be output, the screen can be configured in various forms, and the screen contents can be more easily transmitted through this.

Claims (8)

An apparatus for reproducing predetermined data, an audio processor for decoding preprocessed audio data, and a video processor for decoding data of a preprocessed main image, the apparatus for reproducing a sub-image different from the main image. In addition to controlling the processing path of the data preprocessed by the data processing unit, a system memory for storing the basic data and the standard color information of the sub-image for overall control is provided, and the display area of the sub-image is analyzed by analyzing the additional data inherent in the sub-image. Control means for outputting information on the mixing ratio; And a sub-image memory for storing information about the display area and the mixing ratio supplied from the controller, and sub-image data preprocessed by the data processor, and outputting the mixed image with the main image supplied from the video processor. Sub-image playback device comprising a processing means. The sub-image reproducing apparatus according to claim 1, wherein the controller analyzes the header and table data of the sub-image to find out the size information of the sub-image, and then calculates the position data and the color information of the mixing ratio of the display area. . The sub-picture reproducing apparatus according to claim 2, wherein the table data comprises a plurality of tables having data on display time and display control command of each pixel. In the region allocating method of sub-image memory for storing sub-picture data consisting of a header, pixel data and table data in a separate form, a sub-picture header and a sub-picture to obtain size information and position information of pre-processed sub-picture data. Interpreting the table data; And storing the result data according to the analysis in the sub-image memory. 5. The method of claim 4, wherein the storing in the sub-image memory comprises: storing position data specifying a display area in a first area, and storing sample color information for specifying a color of the sub-picture in a second area. And storing the memory region selection variable Memory_Num and the display display variable Display_On / Off in the third region and the fourth region, respectively, and storing the bitmap data in the fifth region. Area allocation method of sub-image memory. 6. The method of claim 5, wherein the storing of the position data in the first region comprises: starting position data Start_X on the horizontal side, start position data Start_Y on the vertical side, and ending position on the horizontal side in four small regions; And storing the data (End_X) and the end position data (End_Y) on the vertical side, respectively. 6. The method of claim 5, wherein the standard color information comprises luminance data having a data length of 8 bits, and first chroma data and second chroma data, respectively. The memory device of claim 5, wherein the fifth area is divided into a memory area for recording bitmap data and a memory area for outputting the bitmap data according to its use, and each memory area may be used interchangeably. Memory allocation method for sub-picture data characterized in that.