KR0154247B1 - Method for auto-searching of video compact disc - Google Patents

Abstract

The present invention relates to an automatic search method of a video compact disc, comprising: first determining whether the automatic search mode is set at the beginning; and performing a jump operation when it is determined that the automatic search mode is set at the step (50). In step 52, starting playback (T time) after completing the jump operation in step 52, or is the reproduction of the first I picture performed during the execution of step 54 completed? In step 56, if it is determined in step 56 that the reproduction of the I picture is completed, storing and storing the completion time T + 1 (58), and in the auto search mode in step 50 If it is determined that is released is characterized in that it comprises a step (60) to start the playback from the playback time (T time) in the step 54 to perform a repeating operation, the user observes the screen during the automatic search You can play the scene you want to see In addition, it is possible to change the search speed by jumping for a variable time depending on the number of searches, and has an effect of automatically searching by one search key operation.

Description

Automatic search method of video compact disc

1 is a block diagram showing the structure of a conventional video compact disc encoding apparatus.

2 is a flowchart showing an automatic search method of a video compact disc according to the present invention.

FIG. 3 is a flowchart showing the detailed steps of determining whether the automatic search mode is set in FIG.

4 is a flowchart for explaining the playback operation in setting the playback mode in the automatic search method of a video compact disc according to the present invention.

* Explanation of symbols for main parts of the drawings

4: preprocessing unit 10: DCT processing unit

12: quantization unit 14: inverse quantization unit

16: reverse DCT 20: first frame memory

22: motion compensation unit 24: motion estimation

26: second frame memory 28: macro block type storage unit

30: variable length encoding unit 32: channel buffer

34: program string generation unit

The present invention relates to an automatic search method for a video compact disc, and more particularly, to an automatic search method for a video compact disc that enables faster screen searching during forward and reverse high speed search.

In general, an MPEG information recording medium that records audio / video information using a moving picture expert group (MPEG) method, such as a video compact disc, is drawing attention as a next generation audio / video information recording medium. On the information recording medium, MPEG, that is, more precisely, the standard specification for moving picture processing proposed by MPEG1 (for video discs, a playback amount of approximately 74 minutes of video can be recorded on the information recording surface of a 12 cm compact disc, and the capacity is about The video and audio are recorded in a compressed state based on 650MB and a read speed of 1.5Mbps 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 encoding apparatus for encoding video stream data in such a manner that the video disc can be recorded on the video disc, as shown in FIG. 1, the SIF (Source Input Format) image to be encoded is encoded, that is, the luminance signal. A video source 2 in which a decimated image is generated with a unit of 720 × 480 and a coding unit of a color difference signal of 360 × 480 each having a number of 4: 2: 2, and the video source 2 Pre-processing unit that performs pre-processing to filter the horizontal and vertical axes of the SIF image from) to make the luminance signal 360 × 240 and the color difference signal 180 × 120. ) Is equipped.

Also, according to the same figure, an adder for adding SIF video input data according to an I picture preprocessed by the preprocessing unit 4 and video data according to P pictures whose motion is compensated from the motion compensator 22 to be described later. (6) and a switching section 8 which is switched to selectively pass the original video data according to the I picture through the preprocessor 4 or the video data according to the addition operation from the adder 6, DCT unit 10 for performing DCT (Discrete Cosine Transform) to remove spatial redundancy by converting spatial domain information of video data passing through switching unit 8 into coefficients consisting of frequency domain, and macroblocks obtained in DCT processing A quantization unit 12 for quantizing a coefficient value of the inverse quantizer, and an inverse quantization process for inverse quantization processing for using the quantized video data as reference frame data for subsequent frame data. The inverse unit 14, an inverse DCT unit 16 for inverse-DCT converting the inverse quantized frame data, an adder 18 for adding inverse DCT-converted frame data and frame data whose motion is compensated for, and an adder 24 thereof. The first frame memory 20 which delays and stores the frame data added by the frame unit, and the estimated value from the motion estimation unit 10 which estimates the motion of the video screen by comparing the frame data of the video information with the preceding frame data. By using the motion compensation unit 22 to compensate for the movement of the frame data from the first frame memory 20 to generate frame data such as a P picture, the frame data estimated by the motion estimation unit 24 are obtained. Between the second frame memory 26, which is delayed stored in units of frames, the frame data from the first frame memory 20 and the frame data from the second frame memory 26, between 16 × 16 macroblocks. side In other words, VLC (Variable Length Coding) is performed on the macroblock shape determining unit 28 and the quantization unit 12 to generate a motion vector, thereby forming video stream data, and various start bits. And a variable length encoder 30 for adding additional information, a channel buffer 32 for buffering the encoded encoded video stream data for each channel, and the program stream data by combining the video stream data with the audio stream data. And a program stream generation unit 34 for recording on the video disc 36.

In the encoding device of a video compact disc having such a component, if the SIF image provided in the video source 2 is filtered through the preprocessor 4, the DCT unit 10 switches the switching unit 8. DCT processing of the original video data through the spatial domain information is converted into coefficients of the frequency domain, and the quantization unit 12 quantizes coefficient values of the DCT-converted video data, while the quantized frame data is inverse quantized. After inverse quantization through the unit 14 and inverse DCT conversion through the inverse DCT unit 16, the preceding frame data in the motion compensator 22 through the estimated value estimated by the motion estimation unit 24 It is added by the adder 18 together with the frame data that compensates for the movement of the memory, and is delayed and stored in the first frame memory 20.

In this state, the motion compensator 22 corrects the motion of the frame data from the first frame memory 20 based on the estimated value according to the motion estimation of the motion estimation unit 24, and thereby the frame data of the P picture. The adder 6 adds the original frame data according to the I picture from the preprocessor 4 and the frame data according to the P picture from the motion compensator 22 to add the frame data. The frame data passes through the switching section 8.

On the other hand, the frame data quantized by the quantizer 12 is VLC-processed by the variable length encoder 30 to be generated in the form of video stream data, and the video stream data buffered through the channel buffer 32 is programmed. The stream generator 34 is combined with the audio stream data to generate program stream data.

Accordingly, the video disc 36 has an I picture composed of the original reference picture, a P picture predicted based on the I picture or a previous P picture, and forward and backward and bidirectional prediction through the I picture or P picture. Video information data consisting of B pictures are inputted in the order of I picture-B picture-B picture-B picture-P picture-B picture-B picture-B picture-P picture ... and then I picture-P picture-B Encoded and recorded in the order of Picture-B Picture-B Picture-P Picture-B Picture-B Picture-B Picture ...

Here, the I picture is encoded by performing DCT processing without taking a difference, so that the image 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 performed. This becomes possible. The P picture is a predicted picture that has been previously compressed in time by using motion compensation prediction in an I picture or a P picture, which is a reference picture that has already been decoded. In addition, the B picture is predicted by using motion compensation prediction in both directions of an I picture or a P picture, which is a reference picture decoded and positioned in time earlier, and a I picture or P picture, which is a reference picture decoded and placed in time later. It is a burn.

In such a video compression system using MPEG, when the forward fast search mode and the reverse fast search mode are selected, the first I picture is sequentially jumped forward or backward by an interval (for example, a predetermined track) corresponding to a predetermined picture. By reproducing, the screen is searched at high speed. In this case, in the forward fast search mode and the reverse fast search mode, there is no choice but to wait for the predetermined picture after jumping a predetermined predetermined track forward or backward. Not only is it constant, but it also takes a long time, and since the jump operation is performed only for a predetermined amount of tracks during one operation of the search key for setting the forward fast search mode and the reverse fast search mode, until the desired position is found. There was a hassle to keep pressing the navigation keys.

Accordingly, the present invention has been made in view of the above circumstances, and when the navigation keys for setting the forward fast search mode and the reverse fast search mode are manipulated, the screen is searched by regenerating the unit screen (I picture) while sequentially jumping. Its purpose is to provide an automatic search method for video compact discs that can be implemented more quickly.

According to a preferred embodiment of the present invention, in order to achieve the above object, if the automatic search mode is set by turning on the automatic search key, performing a jump in a predetermined variable unit, and immediately after performing the jump in the step ( T time) to perform playback, and storing the completion time (T + 1 time) when playback of the first I picture during playback in the above step is completed and until the search key is turned off. Repeating the above steps, if the playback key is set by the user, the auto search key is automatically turned off, and playback is normally performed from the time (T time) when the jump is performed immediately before the playback key is set. An automatic search method for a video compact disc is provided.

The automatic search mode is set to jump by a predetermined variable unit. The fast search jump time corresponding to the repetition frequency of the steps is variably set, and then the automatic jumping is performed for the predetermined variable time corresponding to the repetition frequency.

As described above, the automatic search method of the video compact disc according to the present invention allows one-time operation of the automatic search key to search while varying the jump time in a predetermined unit, and automatically turns off the automatic search key when the play button is operated. In order to allow playback to be performed normally from the time when the jump is performed (T time) just before the play key is set, the user can observe the unit picture, i picture, which is reproduced with variable jump, and then select the desired scene from the I picture. When the screen is recognized and the playback key is set, it can be played from the beginning of the frame containing the I picture (the time when the jump was performed just before the playback key is set), and the desired speed can be searched while changing the search speed. To make sure.

Hereinafter, an automatic search method for a video compact disc according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart showing an automatic search method of a video compact disc according to the present invention, which comprises first determining whether the automatic search mode is set in the first step (50), and setting the automatic search mode in the step (50). If it is determined that the step (52) to perform the jump operation, the step (54) to start the playback (T time) after the completion of the jump operation in the step 52, the first step of performing the step 54 Determining whether or not the reproduction of the I picture is completed (step 56); storing (58) and storing the completion time (T + 1) if it is determined in step 56 that the reproduction of the I picture is completed; and If it is determined at 50 that the automatic search mode has been released, a step 60 is provided to start playback from the playback time (T time) in step 54, and the steps are repeatedly performed.

Performing the jump operation in the step 52 is to set the jump time corresponding to the search frequency (N) variably, for example, as shown in Table 1 below to jump for a jump time determined according to the search frequency (N).

FIG. 3 is a flowchart showing the detailed steps of the step 50 of determining whether the automatic search mode is set in FIG. 2, and the determination step 50 of setting the automatic search mode is first started. If it is determined that the automatic search mode is not set in the step 50a of determining whether or not the setting is made (in this case, when the automatic search mode is set and released, that is, in step 50 of FIG. Is a different condition from the step of releasing the automatic search mode of < RTI ID = 0.0 >) < / RTI > turning on the search key and setting the search frequency N to 1 to enter step 52 of FIG. 50 (50b). If it is determined that the search frequency (N) is greater than or equal to the limit (Limit) (50c), and if it is determined that the search frequency (N) is not greater than the limit (Limit) in the step (50c) 2nd stage with search frequency N being N + 1 It comprises the step of ever performing 52 Jump operation.

4 is a flowchart for explaining a playback operation in the automatic search method of a video compact disc according to the present invention, in which the automatic search mode is set in step 70 at the beginning, and has been described with reference to FIG. In the same manner, the automatic search is performed. In step 74, the playback time after the jump is set to T time as in steps 52 and 54 of FIG. Subsequently, in step 76, it is determined whether the play mode is set, and if the play mode is not set, the operation is repeated again from step 72. If it is determined that the play mode is set, the auto search mode is automatically released in step 78 to perform the step of FIG. In step 50, the automatic search mode is determined to be canceled. In step 80, normal playback starts from the T time as in step 60 of FIG.

As described above, according to the automatic search method of the video compact disc according to the present invention, when the automatic search mode is set by one operation of the search key, the playback mode is set, and the jump time is set in a predetermined unit until the automatic search mode is released. The navigation button can be searched in a variable manner, and when the play button is operated, the search key is automatically turned off and playback is normally performed from the time (T time) when the jump is performed immediately before the play key is set. As a result of observing the I picture, that is, the unit picture played by variable jump, and recognizing the screen of the desired scene from the I picture, and setting the play key, the sector containing the I picture (Jump is performed just before the play key is set). Play back from the time you performed), allowing you to search for the desired location while varying the search speed.

Therefore, according to the present invention, the user can play from the scene that he / she wants to watch while observing the screen during automatic search, and can jump for a variable time according to the number of search to change the search speed, and automatically search by one search key operation. It is effective.

Claims (4)

Step 50 determines whether the automatic search mode is set in the beginning, and if it is determined in step 50 that the automatic search mode is set, performing a jump operation (52) and a jump operation in the step (52). In step 54, the playback is started (T time) after the completion of the execution of the step S., and in step 56, it is determined whether the playback of the first I picture that has been performed during the execution of the step 54 is completed. Storing (58) the completion time (T + 1) if it is determined that the reproduction of the I picture is completed; and reproducing time in the step (54) if it is determined that the automatic search mode is released in the step (50). And a step (60) for starting playback from (T time), so as to repeat the above steps. The method of claim 1, wherein the jump operation in the step 52 is to set the jump time corresponding to the search frequency (N) variably and to jump for the jump time determined according to the search frequency (N). Automatic search method of video compact disc. The method of claim 1, wherein the determining step 50 of setting the automatic search mode starts at first and determines whether the automatic search mode is set first, and the automatic search mode is not set in the step 50a. If it is determined that the search key is turned on and the search frequency N is set to 1, the process enters the step 52 (50b), and if it is determined that the auto search mode is set in the step 50a, the search frequency N is limited. (Step 50c) of determining whether or not the limit is greater than or equal to the limit number (Limit). An automatic search method for a video compact disc, comprising the step of performing an operation. 2. The reproducing operation of the step 60 is performed after the automatic search mode is set at the beginning (70), after performing the automatic search (72), and immediately after jumping as in the steps 52 and 54. After setting the playback time to the T time (72), judging whether or not the playback mode is set (76), if it is determined that the playback mode is not set, the operation is repeated from the above step 72, and it is determined that the playback mode is set. When the automatic search mode is automatically released (78), it is determined that the automatic search mode is released in step 50, and the normal playback starts from the T time as in step 60 (80). How to auto detect discs.