KR0136026B1 - Method for searching high speed in a moving picture play-back apparatus - Google Patents

Abstract

According to the present invention, I located before and after the current I picture recorded in the Q channel of the P to Q channels of the video compact disc in the management area of each I picture existing in the header data of the picture layer among the recording areas of the video compact disc. Provides a fast search implementation method for a moving picture reproducing apparatus that encodes the absolute time of a picture so as to perform screen search more quickly by performing access based on the absolute time in the forward fast search mode and the reverse fast search mode. do.

To this end, according to the present invention, a moving picture reproducing apparatus capable of reproducing moving pictures recorded in an MPEG method on a recording medium such as a video compact disc and displaying them as an image, and having a fast forward search mode and a reverse fast search mode, can be played in high speed in the reverse direction and in the forward direction. In the management area of all I pictures existing in the header data of the picture layer in the recording area of the video compact disc, before and after each I picture recorded in the Q channel of the P to Q channels of the video compact disc. Reading the absolute time of the next I picture recorded in the management area of the current I picture in a forward fast search mode, having a recording medium having the absolute time of the I picture encoded therein; Calculating a physical position of a sector on a recording medium based on the absolute time of the read I picture; And accessing by jumping from the current position to the physical position of the sector in the recording medium based on the calculation result. In the reverse fast search mode, the previous I picture recorded in the management area of the current I picture is performed. Reading an absolute time; Calculating a physical position of a sector on a recording medium based on the absolute time of the read I picture; Jumping from the current position to the physical position of the sector in the recording medium on the basis of the calculation result.

Description

Fast Search Implementation Method in Moving Image Playback Equipment

1 is a block diagram showing an example of an encoding / decoding system using a general MPEG method;

2A and 2B show an example of a picture layer encoded by the video encoder shown in FIG. 1;

3 is a block diagram showing an example of a fast search apparatus in a video system using the MPEG method;

4 is a flowchart for explaining the high speed search method of the present invention.

Explanation of symbols on the main parts of the drawings

10 --- analog / digital converter, 11 --- preprocessor,

12 --- video encoder section, 13 --- system multiplexing encoder section,

14 --- recording device, 15, 32 --- system multiplexing decoder,

16,34 --- video decoder, 17 --- post-processing,

18 --- digital / analog converter, 20 --- recording medium,

22 --- spindle motor, 24 --- spindle motor drive unit,

26 --- pickup, 28 --- transfer motor,

30 --- transfer motor drive, 36 --- microcomputer,

38 --- Mode setting section.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fast search implementation method in a moving picture reproducing apparatus, and in particular, by improving the recording format of a video compact disc, screen searching in a fast forward search mode and a fast reverse search mode. The present invention relates to a high-speed search implementation method for a video compact disc player capable of realizing high speed.

Recently, MPEG method has been proposed as a standard for video high efficiency coding method for digital storage media. In this standard, special functions such as random access and high speed playback as well as forward / reverse playback are considered.

The storage medium targeted by the MPEG has a continuous transmission speed of about 1.5 Mb / s, like a compact disc, which is not only directly connected to a decoder but also connected via a transmission medium such as a computer bus and a telecommunication network. It also assumes.

In the MPEG type high efficiency coding method, DCT (Discrete Cosine Transform) and variable length coding are first used to perform motion compensation to reduce the redundancy in the time axis direction, to take the difference between the images, and to reduce redundancy in the spatial axis direction.

That is, in general, since the previous and previous pictures are almost similar in successive moving pictures, the difference between the current picture to be encoded and the previous picture in the forward predicted picture, or temporally forward or backward or forward in the bidirectional predictive picture. The difference between the interpolated image produced at the rear side and the difference is encoded and transmitted to reduce the amount of information to be transmitted by reducing redundancy in the time axis direction.

The structure of MPEG video data recorded on a recording medium such as a video compact disc using the MPEG method includes a sequence header, a group of pictures layer (GOP), a picture layer, and a slice layer. Layer) and the like, of which information such as the type of picture and the order of reproduction are recorded in the header data of the picture layer.

The picture types include an I picture (Intra coded picture), a P picture (Predictive-coded picture), and a B picture (Bidirectionally Predictive-coded picture). Among these pictures, I pictures are encoded by performing DCT processing without taking a difference The picture is reconstructed using only the information of the I picture itself. This encoding method generally decreases data compression efficiency, but if it is put everywhere, random access or high speed playback is possible, and the P picture is previously A predicted picture that is located and compressed by using motion compensation prediction in an I picture or a P picture that is already decoded, and the B picture is temporally associated with an I picture or P picture that is a reference picture that has already been previously decoded in time. It is a predictive image compressed by using motion compensation prediction in both directions of an I picture or a P picture which is a later-decoded reference picture.

In the current video compact disc player using the MPEG method as described above, when the forward fast search mode and the reverse fast search mode are selected, a jump is performed in the forward or reverse direction by an interval (for example, a predetermined track) corresponding to a predetermined picture. High-speed search of the screen can be performed by sequentially playing the first I picture.

In such a case, however, in the forward fast search mode and the reverse fast search mode, it is only necessary to wait for a predetermined picture to jump forward or backward, and then wait for the I picture to come out. Not only is the time not constant, but the search time is also long.

Accordingly, the present invention has been made in view of the above circumstances, and the recording is performed on the Q channel of the P to Q channels of the video compact disc in the management area of each I picture existing in the header data of the picture layer among the recording areas of the video compact disc. The moving picture playback can be realized faster by encoding the absolute time of the I picture located before and after the current I picture, and performing access based on the absolute time in the forward fast search mode and the reverse fast search mode. It is an object of the present invention to provide a high speed search implementation method in an apparatus.

According to the high-speed search implementation method of the moving picture reproducing apparatus of the present invention for achieving the above object, the moving picture data recorded in the MPEG method on the recording medium, such as a video compact disc is reproduced and displayed as an image, and the forward fast search mode and A moving picture reproducing apparatus having a reverse fast search mode and capable of high-speed playback in reverse and forward directions, wherein P to Q of the video compact disc are stored in the management area of all I pictures existing in the header data of the picture layer among the recording areas of the video compact disc. It has a recording medium in which the absolute time of the I picture located before and after each I picture recorded in the Q channel of the channel is encoded, and in the forward fast search mode, the next I picture currently recorded in the management area of the I picture is recorded. Reading an absolute time; Calculating a physical position of a sector on a recording medium based on the absolute time of the read I picture; And accessing by jumping from the current position to the physical position of the sector in the recording medium based on the calculation result. In the reverse fast search mode, the previous I picture recorded in the management area of the current I picture is performed. Reading an absolute time; Calculating a physical position of a sector on a recording medium based on the absolute time of the read I picture; And accessing by jumping from the current position to the physical position of the sector in the recording medium on the basis of the calculation result.

Therefore, according to the present invention configured as described above, the next I picture is searched by reading the absolute time of the next I picture present in the management area of the current I picture of the video compact disc in the forward fast search mode in the moving picture reproducing apparatus. The absolute time of the next I picture present in the management area of the next I picture is read out and the I picture is searched. In reverse fast search mode, the absolute I picture immediately preceding the current I picture is referred to. After the time is read out and played back, the absolute time of the immediately preceding I picture present in the management area of the reproduced I picture is continuously read in such a manner that the high-speed search can be easily performed.

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

FIG. 1 is a block diagram showing an example of an encoding / decoding system using a general MPEG method. The MPEG encoding / decoding system uses a digital signal such as luminance (Y) and color difference (Cr, Cb) in the analog / digital conversion unit 10. The preprocessing unit 11 for receiving the converted video signal and converting the video signal into the data format required by the video encoder 12 and the video signal input from the preprocessing unit 11 to reduce degradation as much as possible. In short, the video encoder unit 12 which makes a bit string consisting of a plurality of picture layers as shown in Fig. 2, which conforms to the MPEG standard, and at the time of reproducing data such as an audio signal, a synchronization signal and a text signal in the bit string A system multiplexing encoder unit 13 which multiplexes to be synchronized, and which stores the multiplexed data, such as a video compact disc. A system multiplexing decoder unit 15 for synchronizing and separating the recording device 14 made of a medium, the multiplexed playback video signal and audio signal read out from the recording device 14, and the system multiplexing decoder unit 15. The video decoder unit 16, which generates a moving image by passing the bit string of the specification determined in the MPEG standard, which is a reproduced video signal from the line, and the moving image from the video decoder unit 16 according to the specification of the output display And a post-processing unit 17 which performs pixel interpolation, rate conversion, aspect ratio conversion of pixels, and the like, and outputs the digital / analog conversion unit 17 to an output display.

If the video signal inputted from the video encoder unit 12 is encoded into the picture layer as shown in FIG. 2, these picture layers are sequenced in the video decoder 16 in the following order: I → ⑤P → ②B → ③B → ④B → ⑧I → ⑥B → ⑦B. Is input and decoded. Here, 9B is decoded using the I picture or P picture next and then the I picture or P picture and 8I.

3 is a block diagram showing an example of a high-speed search apparatus in a video system using the MPEG method. The high-speed search apparatus used in the present invention is designed to reduce the deterioration of the video signal as much as possible and to reduce the amount of data. Spindle motor 22 for rotating a recording medium 20, such as a video compact disc, in which a multiplexed data is recorded in a bit string made up of a picture layer of a plurality so as to synchronize data such as an audio signal and a synchronization signal. And data reading means 26, such as a spindle motor driver 24 for driving the spindle motor 22, an optical pickup device for reading recorded data recorded on the recording medium 20, and the data reading means. A system multiplexing decoder unit 32 for synchronizing and separating the video signal, the audio signal, and the like among the data read out from (26) Take over the bit string of the specification determined in the playback video signal from the system multiplexing decoder unit (32) MPEG standard and a video decoder section 34 to create a moving picture.

Here, the current recorded on the Q channel of the P to Q channels of the video compact disc in the management area of each I picture existing in the header data of the picture layer among the recording areas of the recording medium 20 such as the video compact disc. The absolute time of the I picture located before and after the I picture is encoded.

Next, the operation of the present invention will be described in more detail with reference to the flowchart of FIG.

First, when power is supplied to the system as described above, initialization is performed by the microcomputer, and then the normal setting mode is set by the mode setting unit 38, the reproducing operation is performed accordingly, while the fast forward search mode is performed. ), The absolute time of the next I picture recorded in the management area of the current I picture decoded by the current video decoder 34 is read (step S21), and recorded based on the absolute time of the next I picture read out. The physical position of the sector of the next I picture on the medium 20 is calculated (step S22), and then the transfer motor driver 30 is controlled so that the data reading means 26 can read the calculated physical position. The recording data recorded at the position is accessed by moving to the desired position (step S23). Then, if the forward fast search mode is not terminated by the user, the absolute time of the next I picture recorded in the management area of the accessed I picture is read again as described above, and the absolute time of the next I picture read out. Calculate the physical position of the sector of the next I picture on the recording medium 20, and then control the transfer motor driver 30 so that the data reading means 26 can read the calculated physical position. By moving to the desired location and accessing the recorded data recorded at that location, the absolute time of the next I picture recorded in the management area of all I pictures is continued in the same manner as described above until the user stops the forward fast search mode. A forward high speed search operation is performed by reading and controlling the playback system based on the read.

On the contrary, when the fast reverse search mode is selected by the user, the absolute time of the immediately preceding I picture recorded in the management area of the current I picture decoded by the current video decoder 34 is read out. (Step S31), the physical position of the sector of the immediately preceding I picture on the recording medium 20 is calculated based on the absolute time of the immediately preceding I picture (step S32), and then the transfer motor driver 30 Control to move the data reading means 26 to the desired position so that the calculated physical position can be read out to access the record data recorded at that position (step S33). Then, if the reverse fast search mode is not terminated by the user, the absolute time of the immediately preceding I picture recorded in the management area of the accessed I picture is read again, and the absolute of the immediately preceding I picture is read. The physical position of the sector of the immediately preceding I picture on the recording medium 20 is calculated based on time, and then the transfer motor driver 30 is controlled to allow the data reading means 26 to read the calculated physical position. By moving to the desired position so that the recorded data recorded at the position is accessed, the absolute I picture recorded immediately in the management area of the I picture in the reverse direction as described above until the user stops the reverse fast search mode. The reverse fast search operation is performed by reading time and controlling the playback system based on the time.

Therefore, as can be seen from the above description, according to the present invention, the current I picture is included in the management area of all I pictures among the contents of the header data existing in the picture layer recorded in the MPEG method on a moving picture recording medium such as a video compact disc. By recording the absolute time for the I picture before and after, it is easy to search based on the absolute time recorded in the management area of each I picture unlike the conventional method in the forward fast search mode or the reverse fast search mode. By doing so, it is possible to realize a special reproducing operation such as the forward fast search or the reverse fast search at a higher speed.

Claims (1)

In a moving picture reproducing apparatus capable of reproducing moving pictures recorded in MPEG format on a recording medium such as a video compact disc and displaying them as an image, and having a fast forward search mode and a reverse fast search mode, capable of high speed playback in reverse and forward directions. In the management area of all I pictures existing in the header data of the picture layer in the recording area of the video compact disc, the I pictures located before and after each I picture recorded in the Q channel of the P to Q channels of the video compact disc. Reading the absolute time of the next I picture recorded in the management area of the current I picture in the forward fast search mode, having a recording medium having an absolute time encoded therein; Calculating a physical position of a sector on a recording medium based on the absolute time of the read I picture; And accessing by jumping from the current position to the physical position of the sector in the recording medium based on the calculation result. In the reverse fast search mode, the previous I picture recorded in the management area of the current I picture is performed. Reading an absolute time; Calculating a physical position of a sector on a recording medium based on the absolute time of the read I picture; And accessing by jumping from a current position to a physical position of a sector in the recording medium on the basis of the calculation result.