KR100188214B1 - Decoding control device of moving picture compression disc - Google Patents

Abstract

The present invention relates to a decoding control apparatus for a moving picture compressed disk, comprising: an audio / video separation unit (32) for separating audio stream data and video stream data from information data read from the video disk (30), and the separated video. A buffer unit buffering the stream data, switching between the high speed reproduction mode and the normal reproduction mode, and the low frequency components I _LF and P _LF of the I picture and the P picture, and the high frequency components of the I picture and the P picture ( A picture switching unit (36) for separating I _HF , P _HF ) and B pictures, and a low frequency component (I _LF , P _LF ) of the separated I pictures and P pictures to decode and reconstruct the pixel data. A second video decoding means for decoding the low frequency components (I _LF , P _LF ) and B pictures of the I picture and the P picture separated by the video decoding means and the picture switching unit 36 to restore the frame data of the pixel. Coding means (44,46,48) and the second video decoding number. Motion compensation means 50 for compensating motion by bidirectionally predicting frame data from stages 44, 46, and 48, and frame data and motion compensation through the second video decoding means 44, 46, and 48. A first adding means 52 for adding interpolation data whose motion is compensated for by the means 50 and the second video decoding means 44, 46, 48 through the frame data or the adding means 52. Switching means (54) for selectively passing frame data, second adding means (56) for adding frame data decoded by said first video decoding means and frame data passed through said switching means (54); Playback speed switching selectively switched to pass the frame data from the first video decoding means in accordance with the fast playback mode or to pass the frame data through the second adding means 56 in accordance with the normal playback mode. A control for switching the picture switching means 36 and the playback speed switching means 58 in accordance with the fast playback mode or the normal playback mode by receiving system header information from the stage 58 and the video disc 30; It is characterized in that it comprises a means (60).

Description

Decoding control device for video compressed disk

1 is a block diagram showing the configuration of a conventional decoding apparatus for a conventional video disc.

2 is a diagram showing the structure of a picture group provided in a video disc.

3 is a diagram illustrating a state in which an I picture and a P picture of the picture group shown in FIG. 2 are separated into low frequency (LF) and high frequency (HF) and coded.

4 (a) is a schematic diagram showing the structure of a data stream including an encoded I picture and a P picture as shown in FIG.

4 (b) is a diagram showing the structure of a data stream as a result of decoding the data stream of FIG.

5 is a block diagram showing the configuration of a decoding control apparatus for a moving picture compressed disk according to the present invention.

* Explanation of symbols for main parts of the drawings

30: video disc 32: audio / video separation unit

34: buffer unit 36: picture switching unit

38,44 variable variable decoder 40,46 inverse quantization unit

42,48: reverse DCT 50: motion compensation means

52,56: adder 54: switching unit

58: play speed switch 60: micom

The present invention relates to a decoding control apparatus for a moving picture compressed disc. More specifically, an I picture (Intra Picture) and a P picture (Predicted Picture) are separately encoded into low frequency and high frequency components in a data compression algorithm of video information. A decoding control apparatus of a moving picture compressed disc for decoding a video stream data of a disc so that a normal moving picture can be reproduced in a normal playback operation and a high speed playback operation.

Recently, an MPEG type information recording medium that records audio / video information using a moving picture expert group (MPEG) method such as a video compact disc (hereinafter referred to as a video disc) has attracted attention as a next generation audio / video information recording medium. As such, an MPEG-type information recording medium can record a playback amount of approximately 74 minutes of video on MPEG, that is, a standard standard for moving picture processing proposed by MPEG1 (in the case of a video disc, an information recording surface of a 12 cm compact disc). Video and audio are recorded in a compressed state based on a read capacity of about 650 MB and a read speed of 1.5 Mbps per second.

In the MPEG method, while conventional JPEG removes spatial redundancy, since it is composed of moving images, VLC (Variable Length Coding) is removed by removing temporal redundancy through DCT (Discrete Cosine Transform) processing and quantization. Through this, the optimal compression rate is ensured and recorded on the video disc.

On the other hand, according to the decoding apparatus of the video disc reproducing system for decoding the video information recorded on the video disc, as shown in FIG. 1, the video bit stream or the program stream from the information data read out from the video disc 2 (Program). An audio / video separation unit 4 for reading audio stream (PS) and separating audio information, and a buffer unit for buffering the separated video stream data and removing overhead information, that is, various header information and start codes. (6) a variable device coder 10 for performing VLD (Variable Length Decoding) processing of the video bitstream, and inverse quantization for dequantizing quantized data to form the decoded video information data into frame data. The inverse DCT unit 12 for inverse DCT transforming the inverse quantized video data, and the inverse DCT video data and movement A switching unit 14 for selectively passing the damaged frame data, a first frame memory 16 for storing video information data decoded by the variable length decoder 8 in units of frames, and the first frame memory 16. Frame movement through the first frame memory 16 and the front motion compensator 18 to compensate for the movement of the front frame data by the forward prediction through the rear frame data through the frame unit. The second frame memory 20 to store the memory, the backward movement compensation unit 22 that compensates for the movement of the rear frame data through the second frame memory 20 by the backward prediction through the original frame data, and the bidirectional direction thereof. The frame data compensated by the prediction of the average value compensator 24 and the macroblock type vector type information from the variable length decoder 8 are switched to the forward motion compensator 18 or the like. A switching switching unit 26 for selectively passing frame data compensated by the motion compensation compensation unit 22 or the average value compensation unit 24, and the video data passing through the inverse DCT unit 12 and its switching clauses; And an adder 28 which adds the compensated frame data and passes through the switching unit 14 to pass through the annular portion 26.

In a video disc decoding apparatus having such a component, the video information data recorded on the video disc includes an I picture consisting of an original reference picture, a P picture predicted based on an I picture or a previous P picture, and an I picture. It consists of B pictures that can be predicted forward, backward, and bi-directionally through P picture, and the video information data is I picture-P picture-B picture-B picture-B picture-P picture-B picture-B picture-B picture. Audio information encoded in the following order and recorded on the video disc 2, which is packetized in the audio / video separation unit 4 by reading the video bit stream from the video disc 2; When the video information is separated from the video information and the overhead information is removed, the pixel value of the original screen is restored after the VLD process, the inverse quantization process, and the inverse DCT process. The motion compensation is performed through the backward movement compensation by the rear movement compensation unit 22 and the bidirectional interpolation by the average compensation unit 24, so that the I picture -B picture -B picture-as shown in FIG. The decoded blocks are output in the order of B picture-P picture-B picture-B picture-B picture-P picture.

However, in the decoding apparatus of such a video disc playback system, the I picture and the P picture predicted from the I picture and the B picture corrected in the time axis from the I picture and the P picture are used as the reference during normal playback operations. Since screen data is signal processed, normal picture playback is possible, but in high speed playback such as FF (Fast Forward) or FR (Fast Reverse), it is impossible to decode the data of P and B picture before and after the picture. Since only the I picture composed of screen data is required to be decoded, the next I picture must be played after the I picture is played back. The disadvantage is that you lose.

Accordingly, the present invention has been made in view of the above-described circumstances, and is used in the case where the I picture is separated into a low frequency component and a high frequency component, and the P picture is a high-speed playback of a video disc on which a video stream composed of the low frequency component of the I picture is recorded. It is an object of the present invention to provide a decoding control apparatus of a moving picture compressed disc that enables the reproduction of a natural video picture by decoding only low frequency components of an I picture and a P picture, and at the same time, outputs a normal picture even under normal playback.

In order to achieve the above object, according to the decoding control apparatus of a moving picture compression disk according to the present invention, an I picture and a P picture are separated into a low frequency component screen and a high frequency component screen, of which P pictures are I coded and high frequency. A decoding apparatus for decoding a video information data of a video disc in which a component is P-coded and a video stream having system header information for a corresponding picture component is recorded; An audio / video separation unit for separating data from audio information and a video stream from information data read from the video disc, a buffer unit for buffering the separated video stream data, and switching in a high speed playback mode and a normal playback mode. A picture switching unit for switching the low frequency components of the I picture and the P picture, the high frequency components of the I picture and the P picture, and the B picture, and the low frequency components of the separated I and P pictures to decode the shape of the pixel data. First video decoding means for restoring the video signal, second video decoding means for decoding the low frequency components and the B picture of the I-picture and the P-picture separated by the picture switching unit, and restoring the video data into a frame data of the pixel; Motion compensation means for compensating motion by bi-directionally predicting the frame data from the video decoding means, and a frame through the second video decoding means. First adding means for adding data and interpolation data whose motion is compensated for by the motion compensating means, switching means for selectively passing frame data through the second video decoding means or frame data through the adding means; Second adding means for adding the frame data decoded by the first video decoding means and the frame data passing through the switching means, and passing the frame data from the first video decoding means in accordance with the fast playback mode; A playback speed switching means selectively switched to pass the frame data through the second adding means in accordance with the normal playback mode, and system header information from the video disc; A control number for switching and controlling the picture switching means and the reproduction speed switching means; By having the control unit provides a decoding of the compressed disk dongyoungsa configured.

According to the present invention made as described above, the I picture is separated into a low frequency component and a high frequency component, and the P picture is a high-speed playback of a video disc on which video stream data consisting of I-coded low frequency components and P-coded high frequency components are recorded. In this case, high-speed special playback such as FF or FR is possible by decoding only the low-frequency components of the I-picture and P-picture and reconstructing them in the form of frame data consisting of pixels, and during normal playback, low-frequency components of the I-picture and P-picture The decoded frame data and the frame data decoded by the high frequency components of the I picture and the P picture are superimposed with each other to form an I and P picture, and the B picture is decoded from the I and P to enable normal playback. Doing.

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

That is, FIG. 3 is a diagram illustrating a state in which the I picture and the P picture of the picture group shown in FIG. 2 are separated coded into low frequency (LF) and high frequency (HF), and according to the figure, a video applied to the present invention. In the video stream data of a disc, I picture is separated and coded into low frequency component (I _LF ) and high frequency component (I _HF ), and P picture is high frequency component (P _LF ) and I coded low parking component (P _HF ) It is coded separately.

FIG. 4A is a schematic diagram showing the structure of video stream data including the I picture and P picture encoded as shown in FIG. 3, and according to the video stream data shown in FIG. The gate (I _LF) is coded to be formed at the front of the high frequency component (I _HF ) and coded to form the B picture component after the high frequency component (P _HF ) of the P picture, while at the front of the video stream data. System header data including system information about the I picture and the P picture component, that is, data length, display reference time point, and the like are formed.

According to the present invention, if the encoded video stream data as shown in FIG. 4 (a) is decoded according to the fast playback mode, as shown in FIG. 4 (b), I _LF -P _LF − P _LF -I _LF -P _LF -P _LF ..... Decoded in order to play back the video.

5 is a block diagram showing the configuration of a decoding control apparatus for a moving picture compressed disk according to the present invention. In the device of the present invention, reference numeral 32 denotes audio stream data and the like from information data read from the video disk 30. An audio / video separator for separating the video stream data is shown, and 34 denotes a buffer unit for buffering the separated video stream data.

Reference numeral 36 is switched and controlled by a microcomputer 60 to be described later to separate the low frequency components I _LF and P _LF of the I picture and the P picture from the video stream data, and the high frequency of the I picture and the P picture. The picture switching part which isolate | separates component (I _HF , P _HF ) and B picture, respectively is shown.

In addition, reference numeral 38 denotes a variable-length decoder for VLD processing the low frequency components I _LF and P _LF of the separated I picture and P picture, and 40 denotes a low frequency component I of the VLD processed I picture and P picture. _LF , P _LF ) represents an inverse quantization unit for inverse quantization, and 42 denotes an inverse for restoring low frequency components (I _LF , P _LF ) of the inversely quantized I picture and P picture to frame data having pixels by inverse DCT processing. DCT part is shown.

Reference numeral 44 denotes a variable-length decoder for VLD processing the high frequency components (I _HF , P _HF ) and B pictures of the I and P pictures separated by the picture switching unit 36, and 46 denotes the VLD processing. An inverse quantization unit 46 for inversely quantizing the high frequency components (I _HF and P _HF ) of the I picture and the P picture to form frame data, and 48 denotes a high frequency component of the dequantized I picture and P picture ( I _HF and P _HF ) are shown in the inverse DCT section for performing the inverse DCT processing and restoring the pixel data.

Reference numeral 50 denotes a motion compensating means for compensating for motion of video information by forward, backward and bidirectional prediction through a B picture decoded by the variable length decoder 44, and 52 denotes the inverse DCT unit 48. And an frame adder that adds frame data through the frame data and frame data whose motion is compensated for by the motion compensating means 50.

Further, reference numeral 54 is switched by vector type information in the form of macroblocks from the variable length decoder 44 so that the frame data from the inverse DCT unit 48 or the frame data from the adder 52 can be obtained. Denotes a switching unit which is switched to selectively pass the signal, and 56 denotes frame data for the low frequency components I _{LF and} P _LF of the I picture and the P picture from the inverse DCT unit 42 and the switching unit 54. Represents an adder that adds frame data that has passed.

Further, reference numeral 58 is controlled by the microcomputer 60, which will be described later, to the frame data from the inverse DCT unit 42 or the adder 56 in accordance with the fast playback mode or the normal playback mode by the user's key setting. Represents a playback speed switching section that is switched to selectively pass frame data from the frame.

Reference numeral 60 denotes the picture switching unit by recognizing the high frequency and low frequency components of the I picture and the P picture through the system header data shown in FIG. 4A in the video stream data from the video disc 30. By controlling the switching (36), the low frequency components (I _LF and P _LF ) of the I and P pictures, and the high frequency components (I _HF and P _HF ) and the B pictures of the I and P pictures are selectively separated and passed. In addition, a microcomputer for switching and controlling the playback speed switching unit 58 in accordance with the fast playback mode or the normal playback mode that is set by the user is shown.

Next, the operation of the present invention made as described above will be described in detail with reference to FIG.

First, when the video stream data is separated from the information data read from the video disc 30 through the audio / video separation unit 32 and then buffered through the buffer unit 34, the microcomputer 60 generates the video stream. By receiving the system header data of the data and recognizing the position information of the I picture and the P picture, the picture switching unit 36 is switched to control the low frequency components (I _LF , P _LF ) of the I picture and the P picture, and the I picture. The high frequency components (I _HF and P _HF ) and B pictures of and P pictures are separated.

At this time, when the high speed playback mode is set by the user's key operation, the microcomputer 60 causes the playback speed switching unit 58 to switch according to the high speed playback mode, while passing through the picture switching unit 36. The low frequency components (I _LF , P _LF ) of an I picture and a P picture are VLD-processed through the variable-length decoder 38 and inversely quantized by the inverse magnetizer 40 to form a frame data, and then inverse DCT. The inverse DCT processing is performed by the unit 42 to restore the pixel data, and the image is reproduced by the reproduction speed changing unit 58.

Accordingly, the frame data decoded from the low frequency components I _LF and P _LF of the I picture and the P picture in the video stream data is formed as shown in FIG.

On the other hand, when the normal playback mode is set by the user's key operation, the microcomputer 60 causes the playback speed switching unit 58 to switch switching according to the normal playback mode, while the variable length decoder 44 the high-frequency component (I _HF, P _HF) and is processing the B pikchwo VLD, the VLD processing the I pikchwo and high frequency components of the P pikchwo (I _HF of the I pikchwo and P pikchwo passed through the pick-chwojeol affected part 36 , P _HF ) is inversely quantized through the inverse quantization unit 46, and is inversely DCT processed through the inverse DCT unit 48. In addition, the motion compensating means 50 predicts the forward, backward and bidirectional motions of the picture screen through the B picture from the variable length decoder 44 to generate frame data whose motion is compensated for.

Then, the adder 52 adds the frame data processed by the inverse DCT by the inverse DCT unit 48 and the frame data according to the motion compensation from the motion compensating means 50, and the switching unit 54. ) Is switched so that the frame data passing through the inverse DCT unit 48 or the frame data from the adder 52 is selectively passed, while the adder 56 is switched from the inverse DCT unit 42. Frame data according to low frequency components (I _LF and P _LF ) of pictures and P pictures, and frame data according to high frequency components (I _HF and P _HF ) and B pictures of I and P pictures passing through the switching unit 54. Will be added.

Therefore, the frame data according to the video information added by the adder 56 is signaled through the playback speed switching unit 58 switched in accordance with the normal playback mode, so that the image can be reproduced as a video of normal speed. Will be.

According to the present invention as described above, when the I picture and the P picture of the video disc are decoded and reconstructed, respectively, the video stream data separated by the low frequency component and the high frequency component, when the high speed playback mode is set, the I picture and P Only the low-frequency components of the picwar allow the decoded frame data to be played back, while in normal playback mode, the low-frequency and high-frequency components of the I-picture and P-picture are combined and decoded by the addition operation to enable normal-speed playback. As a result, the decoding function for the high-speed playback function can be improved, and the synergistic effect on the function is excellent.

Claims (1)

I picture and P picture are separated into low frequency component (I _LF , P _LF ) screen and high frequency component (I _HF , P _HF ) screen, among which low frequency component (P _HF ) of P picture is I coded and high frequency component (P _HF) ) Is P-coded, and a video stream having system header information for the corresponding picture component is recorded. A decoding apparatus for decoding video information data of a video disc 30, wherein the information data is read from the video disc 30. An audio / video separation unit 32 for separating audio stream data and video stream data, a buffer unit 34 for buffering the separated video stream data, switching between a high speed playback mode and a general playback board A low frequency component (I _LF , P _LF ) of the P picture, a picture switching unit 36 that separates the high frequency components (I _HF , P _HF ) and B picture of the I picture and the P picture, respectively, and the separated I picture decoding the low-frequency component of the P pikchwo (I _{LF, LF} P) Low-frequency component of the I pikchwo and P pikwo to recover in the form of a W pixel data (I _LF, P _LF), the VLD processing the first variable length decoder 38 and the VLD processing the I pikchwo and low-frequency component of the P pikchwo that A first video decoding means comprising an inverse quantization coder 40 for inversely quantizing (I _LF , P _LF ) to form frame data, and an inverse DCT portion 42 for inverse DCT processing the dequantized frame data. And second video decoding means 44 for decoding the low frequency components I _LF and P _LF of the I picture and the P picture and the B picture separated by the picture switching unit 36 and restoring the frame data of the pixel. 46, 48, motion compensation means 50 for compensating for motion by bidirectionally predicting the frame data from the second video decoding means 44, 46, 48, and the second video decoding means 44, Frame data through 46 and 48 and interpolation data whose motion is compensated by the motion compensation means 50. A first adding means 52 for adding, switching means 54 for selectively passing frame data through the second video decoding means 44, 46, 48 or frame data through the adding means 52; And second adding means 56 for adding the frame data decoded by the first video decoding means and the frame data passing through the switching means 54, and from the first video decoding means in accordance with the fast playback mode. Playback speed switching means 58 and the video disc 30 that are selectively switched to pass the frame data through the second addition means 56 in accordance with the normal reproduction mode. And control means (60) for switching and controlling the picture switching means (36) and the reproduction speed switching means (58) in response to the system header information from the high speed reproduction mode or the normal reproduction mode. Decoding control device for moving picture compressed disc.