CN1992861A - Recording medium for storing subtitle data structure and method for playing the subtitle data - Google Patents

Abstract

The present invention provides a recording medium storing a subtitle data structure for a video program and a method for playing subtitle data of the video program. Wherein the caption data structure of the video program comprises a plurality of word packets and background packets, and each word packet has a header containing information including start and end of time for displaying the word, X and Y coordinates of the word, X length, Y length, and color of the word, and pixel information for displaying the word. The subtitle data structure of the video program can save the media capacity required for storing the subtitle data. Meanwhile, when playing the caption data of the video program, it reads the multiple word packets stored in the medium, and determines the time of the word displayed on the screen according to the start and end information of the word time displayed in the header.

Description

Recording medium for storing subtitle data structure and method for playing the subtitle data

technical field

The invention relates to a recording medium for storing video programs and a method for playing the video programs, and in particular to a recording medium for storing the subtitle data structure of the video programs and a method for playing the subtitle data of the video programs.

Background technique

Among various storage and recording media, optical discs have been widely used in various fields due to their advantages of high capacity, low cost and easy portability. Its applications include data storage, music listening, and video appreciation. In order to adapt to the characteristics of optical discs and increase the reliability of optical disc data reading, when pre-recorded optical discs store data, when the coded data is 1, the laser light (at 775nm~795nm) of the high-power semiconductor laser passes through the The organic dye recording surface of the optical disc is directly heated to burn out a data pit (Pit), and when the encoded data is 0, no data pit is formed.

When the optical disc player reads the optical disc with a lower power laser, because the data pit (Pit) and the original organic dye recording surface have different reflectivity, it will absorb part of the burned out data pit (Pit) Laser light, and the original surface does not absorb but reflects laser light, and the CD player uses different reflection results to reproduce the original coded digital data (that is, a series of information composed of 0 and 1).

The current development of optical discs is the use of digital versatile discs (digital versatile discs, DVDs), the storage capacity of which has reached several gigabytes, which is sufficient to record movies and programs on the DVD. When the DVD video program is playing, a row of subtitles will appear at the bottom of the screen. And the known way of displaying the subtitles will be described as follows. Please refer to FIG. 1A , which is a block diagram of a conventional single subtitle display process. In fact, DVD playback pastes the stored images on the screen sequentially. For example, a single subtitle packet corresponding to word A and other blank spaces is read from the recording medium R1, and the decoded subtitle image S1 is displayed on the screen. At the same time, read the background packet A/V (Audio/Video) from the recording medium R1, and present the decoded background image B1 (the image includes white cloud 2 and a horse) on the screen, and the subtitle image S1 and the background image B1 are superimposed The superposition of combiners M forms the output image O1. Next, please refer to FIG. 1B , which is a block diagram of a conventional switching and displaying process of multiple subtitles. The corresponding subtitle data structure on the recording medium is shown in the lower figure of FIG. 1B. For example, the playing time of word A starts from t _As to ends at t _Ae . This period of time is called "presenting timestamp" (PTS) and the "presenting timestamp" is stored in the header of the image 1 packet F-P1. Similarly, the playing time of word B starts at t _Bs and ends at t _Be , and the "display period" is stored in the header of the picture 2 packet F-P2. As shown in FIG. 1A , the subtitle image S1 of the known word A and the decoded background image B1 are overlapped by a first laminating device M1 to form a first output image O1. Then, the time axis reaches t _Ae , the first output image O1 is eliminated by the first remover E1, and the display process of another word B is repeated; that is, the single subtitle packet of the corresponding word B and other blanks is read from the recording medium, And the decoded subtitle image S2 and the decoded background image B1 are superimposed on the screen to form a second output image O2 through the second compositor M2. However, disappear according to the word B "display period" until the end of t _Be (executed by the second eliminator), and finally only the background image is output as the third output image O3. It is evident from FIG. 1B that the subtitle image S1 is the same as the subtitle image S2, that is, in the entire base frame 1 (shown by the dotted line), except for the word A or B, the rest are blank. Since the blank area also needs to encode and compress the blank pixel information displaying the blank area in the DVD, this greatly increases the capacity required for media (such as DVD) to store subtitles.

In order to solve the problems of the known technology, it is necessary to provide a medium for storing the subtitle data structure of a video program and a playback method for the subtitle data of the video program, which can greatly reduce the capacity required for storing subtitles.

Contents of the invention

An object of the present invention is to provide a recording medium for storing the subtitle data structure of a video program and a method for playing the subtitle data of the video program. Wherein the subtitle data structure of the video program includes a plurality of single-word packets and background packets, and each single-word packet has the start and end of the time of displaying the single word, the X and Y coordinates of the single word, the length of X, the length of Y and The header of information such as the color of the word, and the pixel information packet displaying the word. The subtitle data structure of the video program can make the recording medium save the capacity required for storing the subtitle data. At the same time, when playing the subtitle data of the video program, read a plurality of word packets stored in the recording medium, and determine where the word is displayed on the screen according to the information of the start and end of the time of displaying the word in the header. time.

Another object of the present invention is to provide a medium for storing subtitle data structure of a video program and a method for playing the subtitle data of the video program. Wherein, the subtitle data structure may be a data structure of words in the first language or a data structure of words in the second language. In other words, the present invention can provide the user to select the language subtitles to be displayed. The subtitle data structure of the present invention includes a first language word pack, a background pack and a second language word pack. Wherein the first language word package includes the start and end information of the memory display period (PTS) and the screen display coordinates X of the first language word, the header of the Y information, and the pixel information displaying the first language word; The second language word packet includes the start and end information of the memory display period (PTS), the header of the screen display coordinates X, Y information of the second language word, and the pixel information displaying the second language word. Therefore, through the subtitle data structure of the present invention, the effect of greatly saving the capacity required for recording media (such as video disk, VD) to store subtitles can be achieved.

A further object of the present invention is to provide a method for playing the subtitle data of the video program through the above subtitle data structure. First, the pixel information and the header of each packet of the N packets read from the recording medium are separated from the header; then, the pixel information packets of each packet are sequentially stored in the image data buffer, The header of each packet is stored in the information buffer in turn; the first pixel (i.e. the first word) information packet and the first header are taken out from the image data buffer; the system timing clock and the display in the first header The beginning of the period (PTS) is compared, if the beginning of the system timing clock ≥ display period (PTS), then according to the information in the information buffer, the first word is pasted on the screen; if when the system timing clock=display At the end of the time period (PTS), the playback control formula stops displaying the first word and continues to take out the image data packet of the second word from the image data buffer, and sends the second word according to the corresponding information in the information buffer. Words are pasted on the screen.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with accompanying drawings.

Description of drawings

FIG. 1A is a block diagram of a conventional single subtitle display process.

FIG. 1B is a block diagram of a known process for switching and displaying multiple subtitles.

FIG. 2A is a block diagram of a single subtitle display process according to a preferred embodiment of the present invention.

FIG. 2B is a block diagram of the switching and displaying process of multiple subtitles according to a preferred embodiment of the present invention.

Fig. 3 is a subtitle data structure of a program storing information according to a preferred embodiment of the present invention.

FIG. 4 is an image data buffer B1 with N pixel information PN and an information buffer B2 with N headers HN.

Description of main component marking

1. Basemap frame

2. White clouds

Detailed ways

Please refer to FIG. 2B, which discloses a recording medium for storing the subtitle data structure of an information program according to a preferred embodiment of the present invention. The recording medium can be a video disk, VD. The subtitle data structure of the video program of this preferred embodiment comprises a plurality of single-word packets and background packets, and each single-word packet has a header that includes the beginning and end (presenting time stamp, PTS) of displaying the time of the single word, and Displays the pixel information packet of the word. In order to understand the present invention easily, give with single character A as example now. The subtitle data structure of the recording medium includes pixel information packets A-P of word A and header and background packets (A/V) including word display period (PTS). Next, please refer to FIG. 2A , read the single subtitle packet corresponding to word A and without blank space from the recording medium R1', and present the decoded subtitle image S1' on the screen (please note that it occupies a small area of the screen). At the same time, read the background packet A/V from the recording medium R1', and present the decoded background image B1' (the image includes Baiyun 2 and the horse) on the screen, and the subtitle image S1' and the background image B1' are passed The superposition of the laminater M forms the output image O1'.

Comparing Fig. 1A with Fig. 2A, it can be seen that the subtitle data structure of the stored information program according to the present invention has the effect of saving the recording medium capacity required to display the blank pixel information corresponding to the blank area. When wanting to display the appearance period of different words, please refer to Figure 2B, wherein the lower figure of Figure 2B shows the recording medium such as VD, including the pixel information packets A-P of A word and the header and background packet including the word display period (PTS) Pixel information packets B-P of (A/V) and B words and their headers including the word display period (PTS). It can be clearly shown from the time axis of Fig. 2B that the occurrence period of the A word is from t=tAs' to t=tAe', and the appearance period of the B word is from t=tBs' to t=tBe', so the A and B two words The simultaneous occurrence period is from t=tBs' to t=tAe'. In other words, it can be seen from the screen that the word A image S1' and the background image B1' are superimposed through the laminating device M1 to form an output image O1'. When the time axis reaches t=tBs', the word B image S1' and the output image O1' overlap through the second laminating device M2 to form a second output image in which the words A and B appear simultaneously as shown in O2'. When the time axis reaches t=tAe', the word A is eliminated by the first eliminator and disappears, and only the third output image O3' of the word B is output. Since the appearance period of the word B is from t=tBs' to t=tBe', when the time axis reaches t=tBe', the word B is eliminated by the second eliminator and disappears, and finally only the fourth output image O4' is output background image.

Compared with the known DVD subtitle data structure, the present invention does not need to divide the remaining blank area in the bottom image frame 1 because the pixel information packet A-P of word A and the pixel information packet B-P of word B only include the pixel information of word A and B. The corresponding pixel information is coded and compressed in the recording medium, so the capacity required for storing subtitles in the recording medium (such as VD) can be greatly reduced.

Simultaneously A and B two individual words among Fig. 2B also can be applicable to when recording medium provides multilingual subtitle, then its subtitle data structure comprises first language individual word package (it is equivalent to individual word A package), background package A/V and For the second language single-word packet (which is equivalent to the single-word B packet), the data structure in FIG. 2B becomes FIG. 3 . Please refer to Fig. 3, wherein this first language individual word packet comprises the start and end 0 information of memory display period (PTS) and the screen display coordinate X of this first language individual word, the header of Y information, and display this first language The pixel information package C-P1 of the word; the second language word package includes the start and end information of the memory display period (PTS) and the screen display coordinates X of the second language word, the header of the Y information, and displays the second language word Pixel information packet C-P2 of a word in a second language.

If the user, for example, has selected the first language (such as Chinese) subtitles, then when the recording medium is played, the control player program only reads the first language single word packet and decodes its pixel information packet C-P1 to display the first language Words on the screen. Because the pixel information of the first language single word package of the present invention is only the pixel information of this first language single word, it is not necessary to encode and compress the corresponding pixel information of the remaining blank area in the base frame 1 in the recording medium; similarly, the second The same is true for language word packs. Therefore, the subtitle data structure of the present invention that can switch multi-language subtitles also greatly reduces the capacity required for recording media (such as VD) to store subtitles. Therefore, through the subtitle data structure of the present invention, the effect of greatly reducing the capacity required for recording media (such as VD) to store subtitles can be achieved.

The present invention also provides a method for playing subtitle data of recorded media video programs. The method comprises: first reading N single-word packets sequentially from the recording medium, and reading also sequentially separating the pixel information packet and the header of each single-word packet showing the single word; then, as shown in Figure 4 The sequentially separated pixel information packets displaying the word are sequentially stored in the image data buffer B1 and numbered as the first pixel information packet P1, the second pixel information packet P2... until the Nth pixel information packet PN. And the headers that are sequentially separated are stored in the information buffer B2 and numbered as the first header H1, the second header H2... until the H-th header HN, wherein the header includes the display period (PTS) Start (PTS-S) and end information (PTS-E), the screen display coordinates X, Y (x, y) information of the word, X length (XL), Y length (YL) and the display color of the word ( C) and other information.

Then, take out the first pixel information packet P1 (that is, the pixel containing the first word) and the first header from the image data buffer; the system timing clock (that is, the system clock of the recording media player) and the first header Compared with the start of the display period (PTS) in the system, if the system timing clock ≥ the start of the display period (PTS) (that is, the playback of the recording medium is still in progress), then according to the information in the information buffer, the first A single word is pasted on the screen; If when the end of system timing clock=display period (PTS), then stop displaying this first single word by the play control formula; Then repeat the previous step, make on the second single word display screen, until The Nth word is displayed on the screen so far.

In summary, this case has the following advantages over the known ones:

1. Compared with the known DVD subtitle data structure, because the pixel information of each word in the subtitle data structure of the video program of the present invention does not include the corresponding pixel information of the remaining blank area in the base frame, the recording medium can be greatly reduced (such as VD) the capacity required to store subtitles.

2. In the subtitle data structure of the switchable multilingual subtitle of the recording medium, since the pixel information of the first language word package of the present invention is only the pixel information of the first language word, it is not necessary to use the remaining blank area in the base frame The corresponding pixel information is coded and compressed in the recording medium. Therefore, the subtitle data structure of the present invention that can switch multi-language subtitles also greatly reduces the capacity required for recording media (such as VD) to store subtitles.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (8)

1. A recording medium for storing subtitle data structures of video programs, characterized in that the subtitle data structures include: a plurality of word packets, wherein each word packet has a header including a start and end time indicating the word, and a pixel information packet indicating the word; and The background packet, through which the pixel information packet displaying the word does not include the corresponding pixel information of the remaining blank area in the display frame, achieves the effect of greatly reducing the capacity required by the media to store subtitle data. 2. The record medium for storing subtitle data structure of video programs according to claim 1, characterized in that the medium is an image disc. 3. The recording medium for storing the subtitle data structure of a video program according to claim 1, characterized in that the header further includes the screen display coordinates X and Y information of the word, the X length, the Y length and the display of the word color information. 4. A recording medium for storing subtitle data structures of subtitles in two languages that can switch subtitles of video programs, characterized in that the subtitle data structures include: The first language word package, which includes the start and end information of the memory display period and the screen display coordinates X and Y information header of the first language word, and the pixel information displaying the first language word; background packet; The second language word package, which includes the start and end information of the memory display period, the header of the screen display coordinates X, Y information of the second language word, and the pixel information displaying the second language word. 5. The record medium for storing the subtitle data structure of subtitles in two languages that can switch subtitles of video programs according to claim 4, characterized in that the record medium is an image disc. 6. The recording medium for storing the subtitle data structure of the switchable subtitles in two languages for storing video programs according to claim 4, characterized in that the header further includes the X length, the Y length and the display color information of the word . 7. A method of playing a recording medium having subtitle data of a video program, characterized in that it comprises: Reading N single-word packets sequentially from the recording medium, and simultaneously sequentially separating the pixel information packet and the header of each single-word packet showing the word; The pixel information packets that are sequentially separated to display the word are stored in the image data buffer and numbered as the first pixel information packet, the second pixel information packet... until the Nth pixel information packet, and are sequentially separated. The headers are sequentially stored in the information buffer and numbered as the first header, the second header H2... until the H header; Take out the first pixel information packet (that is, contain the pixel information of the first word) and the first header from the image data buffer; Compare the system timing clock with the start of the display period (PTS) in the first header, if the system timing clock ≥ the start of the display period (PTS), then according to the information in the information buffer, the first word Paste it on the screen; when the system timing clock is equal to the end of the display period, the playback control will stop displaying the first word; and Then repeat the previous step, so that on the second individual character display screen, until on the Nth individual character display screen. 8. The method according to claim 7, characterized in that the header includes the start and end information of the display period, the screen display coordinates X and Y information of the word, the X length, the Y length and the display color of the word and other information .

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