KR20000008256A - Method for recording video with index method for reproducing recorded video - Google Patents

Abstract

PURPOSE: A method for recording a video with an index and a method for reproducing the recorded video are to store a searching screen with an index data, record a signal corresponding to the index data when recording a video signal, display the stored searching screen on an external screen, and reproduce the video signal from a recorded position of the searching screen. CONSTITUTION: A method for recording a video with an index comprises the steps of: (S10-S12) setting a searching screen among a recorded video screen; (S13) adding a video screen with the set time and a data for searching the video screen to store; and (S14) recording an index signal corresponding to the stored index data in a recording media. The reproducing position which a user starts the reproduction among several signals recorded in the recording media is quickly and accurately searched.

Description

Video recording method and playback method thereof

The present invention relates to an indexed video recording method for reproducing and recording a video signal, and to reproducing the recorded video, and more particularly, to a method of reproducing the video signal. The search screen and the index data for indexing the data are stored together, and a signal corresponding to the index data is recorded on the recording medium.When the recorded video signal is reproduced, the previously stored search screen is displayed on the external screen. The present invention relates to an indexed video recording method for reproducing a recorded video signal, and to a playback method thereof, by individually checking a preset search screen and reproducing the recording from a recorded position of a desired search screen.

In general, a control signal of a uniform duty ratio is recorded every 1/30 (second), that is, one frame video signal recording on the control track of the magnetic tape, and used to measure and phase control the amount of video signal to be reproduced. In particular, the control signal (hereinafter referred to as a "control signal") is a VIS (Video Indexing Search System) method and VASS (VASS) that provides additional location information by varying the duty ratio (duty ratio) as shown in FIG. It is also used as a video addressing search system.

Here, the apparatus for recording and reproducing the video signal using the VIS method or the VASS method includes a control signal generator 11 for generating a control signal as shown in FIG. A control unit 100 for varying the duty ratio of the control signal generated from the control signal generator 11 at each recording time; A tuner 21 for tuning the received broadcast signal; A line signal receiver 22 matching and receiving a signal input from an external device; The luminance / chromatic signal processor which separates the tuning signal or the line signal into luminance and chroma signals during recording, and converts them into recording signals, and restores and synthesizes the video signals read from the video head into luminance and chroma signals respectively. (Y / C) 24; A control signal decoding unit 13 for decoding the encoded signal from the duty ratio of the control signal to be reproduced; And a deck drive unit 30 for driving the tape for playback / recording and searching.

In the video signal recording and reproducing method of the apparatus configured as described above, a broadcast signal of a specific channel among the first broadcast signals received is tuned by the tuner 21 to be applied to the luminance / chromatic signal processor 24. The luminance / chromatic signal processor 24 records on the magnetic tape by performing a signal processing process of separating the luminance and chroma signals from the tuned video signal and converting the separated luminance and chroma signals. The converted video signal is converted into a suitable signal, which is then recorded on a magnetic tape video track by a video head after the signal component is compensated through a preamplifier. At this time, the control unit 100 controls the control signal generator 11 at the start of recording to vary the duty ratio of the control signal so that it is recorded on the control track of the magnetic tape, and thereafter, the video frame interval at which the video signal is recorded. Each time, the control signal of normal duty ratio is continuously recorded by the control head on the magnetic tape.

The recording position display process as described above is performed every time after resuming the recording, the start position is separately displayed on the tape for each recorded zone unit.

After the recording of the video signal is completed by the above-described process, the user searches for the desired recorded video. In the case of the vis method, the relative position value is estimated by estimating the current position of the tape (Fig. 3A, -3, -2, -1,1,2,3 ...). When the relative position value is designated and input as described above, the control unit 100 controls the deck driving unit 30 to drive the tape in the reverse direction or the forward direction at a high speed, and is detected by the control head to be detected by the control signal decoding unit 11. Check the encoded value of the control signal to be decoded, and whenever the value is different from that of the normal control signal, decrease the position value of the specified relative value by one, and drive the tape normally from the position where the value becomes 0. The signal is detected, and the detected image signal is passed through the preamplifier and the luminance / chromatic signal processor 24 in order to output the image on the screen.

On the other hand, when using the bath method, as shown in Figure 3b, the user inputs the absolute address (001,002,003, ... of Figure 3b) where the desired image is recorded, the control unit 100 is the high-speed driving If the address value received from the control signal decoding section 13 is the designated address, the video signal is reproduced from the position.

However, in the recording / reproducing method of the video as described above, the user not only can not remember the sequential positional relationship between the recorded video sections, but if the recording is repeated several times, the user-recorded video desired from the current playback position is displayed. It is impossible to know at what position it is recorded or the address value of the recording position, so that the tape is played in the forward or reverse direction, and the subsequent video is played for each position where the vis or bath is recorded. Since it had to be reproduced, there was a problem that it takes too much time, as well as inconvenience.

Accordingly, an object of the present invention is to provide an indexed video recording method and a playback method thereof, which are created to solve the above problems and quickly find and play a recorded video desired by a user.

1 shows the form of a control signal recorded on a tape;

2 shows the configuration of a video signal recording / reproducing apparatus;

FIG. 3A conceptually shows a control track of a tape on which a position signal is recorded by a VIS method;

3B conceptually shows a control track of a tape on which a position signal is recorded by a VASS method,

4 is a configuration diagram of an apparatus to which an image recording method indexed and a reproduction method thereof according to the present invention are applied;

5 is a flowchart of an indexed video recording method according to the present invention;

Fig. 6 shows the correlation between the index signal recorded on the tape and the index data stored in the RAM.

7 is a flowchart of an embodiment of a method of playing an indexed image according to the present invention;

8 illustrates an example in which a search screen according to the present invention is displayed on a screen in which virtual division is set.

※ Explanation of code for main part of drawing

11 control signal generator 12 amplifier

13: control signal decoding unit 21: Tuner

22: line signal receiver (A / V) 24: luminance / chromatic signal processor (Y / C)

30: Deck Driver 41: Encoder

42 compression / extension (JPEG) 43 RAM

44: Decoder

45: digital signal processing controller

100: control unit (CPU)

According to an embodiment of the present invention, an indexed search screen recording method according to the present invention comprises: setting a search screen among recorded video screens; A second step of assigning and storing the image screen of the set time point and data indexing the same; And a third step of recording an index signal corresponding to the stored index data on a recording medium.

The method for reproducing an indexed image according to the present invention may include: a first step of outputting a previously stored search screen data when a search request of a recording medium is performed; A second step of searching for a recording position of an index signal corresponding to the index data associated with the selected search screen when the search screen for outputting the image is selected; And a third step of reproducing the video signal from the searched recording position.

The video recording method and the reproduction method thereof according to the present invention as described above, the first video image is stored as a search screen when recording the video signal and the index data sequentially assigned to index it, and stored together, the grant The index signal corresponding to the index data is recorded at the start position on the recording medium of the video signal. Subsequently, when a search request of a recording medium is requested by a user when a video signal is reproduced, the search screen of the stored video signal is read out and displayed on the screen, and when the user selects a desired search screen, the selected search screen is selected. The corresponding position on the recording medium on which the index signal corresponding to the corresponding index data is recorded is found, and playback of the video signal is started therefrom.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an indexed video recording method and a playback method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 illustrates a configuration of an apparatus to which an indexed image recording / reproducing method according to the present invention is applied. In addition to the configuration of the recording / reproducing apparatus of FIG. 2, an image signal is applied in units of frames and is orthogonal to each pixel. An encoder 41 for performing transform and quantization; A compressor / extension unit 42 for extracting only low-pass data from each of the coded pixel data to compress the data amount and extending the pre-stored low-pass compressed data to all original pixel data; A RAM 43 for storing the compressed low-frequency data in units of frames; A decoder (44) for performing inverse quantization and inverse orthogonal transformation on all pixels in the extended frame unit; And a digital signal processing controller 45 for controlling all components for coding, compressing and storing the applied image data, and reading, decompressing, and decoding the stored image data. It is configured to include.

FIG. 5 is a flowchart of an indexed video recording method according to the present invention. Hereinafter, the recording method of FIG. 5 according to the present invention will be described in detail with reference to the apparatus of FIG.

First, when there is a recording request (S01), a broadcast signal filtered by the tuner 21 or an external input signal through the line signal receiver 22 is received (S02) and the luminance / chromatic signal processor 24 It is converted into a recording signal and recorded on a video track on a magnetic tape by a video head (S05). At the same time, the control unit 100 generates index data, which is controlled by the control signal generator 11 as a control signal. The data is recorded on the magnetic tape in the format as described above, and the image signal processed by the luminance / chromatic signal processor 24 is transmitted to the encoder 41.

The encoder 41 selects one frame of the received video signal under the control of the digital signal processing controller 45, and orthogonal transform rearranges pixel data constituting the selected screen based on the frequency component of each pixel. After the process of, the orthogonal transformed pixel data is divided by the quantum values differently set according to the frequency characteristics of each region to sequentially perform the quantization process so that the pixel data values of the low frequency region are concentrated (S10). .

The pixel data of one frame converted by the orthogonal transformation and quantization is applied to the compression / extension unit 42 so that only pixel data of the low frequency region focused on the region is selected and converted into compressed data of the still image (S11). The data of the compressed-converted search screen is separately stored in the RAM 43 as shown in FIG. 6 together with the index data recorded on the tape immediately before (S12).

In the tape recording of the index data, the corresponding data is recorded in the form as shown in FIG. 1 corresponding to the logical value, and a recognition header for informing that the index signal is recorded is recorded in the corresponding index signal recorded on the tape. After the recording of the index signal, the normal control signal is continuously recorded according to the general recording process (S14).

As described above, the linked storage of the search screen data with the index data is not performed every time recording is newly started. Instead, the user selects and inputs a screen that is highly recognizable as the index image while the recorded video is output to the screen. In this case, the processed image of the luminance / chromatic signal processor 24 at that time may be compressed and cooperatively stored as described above.

FIG. 7 is a flowchart of an embodiment of a method of reproducing an image indexed and recorded by the above-described process. Referring to the apparatus of FIG. 4, the method of reproducing an image according to the present invention will be described in detail as follows.

First, when there is a key input requesting a search of the search screen (S32) in a state in which a tape on which an image signal on which an indexed search screen is set is recorded is inserted (S31), the controller 100 controls the digital signal processing controller. The control unit 45 controls the pixel data of the frame unit stored in the RAM 43 to be sequentially read (S35). The read pixel data is decompressed and restored to the original pre-compression video signal through the compression / decompressor 42 and the decoder 44 in sequence (S36), and then the composite video signal is processed by the luminance / chromatic signal processor 24. The image is converted into and displayed on the entire external image screen (S37).

While each search screen is sequentially outputted to the external display device at predetermined time intervals, when a user inputs a selection key to one of the search screens that are sequentially displayed (S38), the controller 100 outputs the The index data stored in association with the selected video image is read out from the RAM 43 (S41) and the deck drive unit 30 is controlled to drive the recording tape at a high speed while being controlled by the control head from the control track. When it is detected (S42) and the logical value of the index signal to be decoded by the control signal decryption unit 13 is recognized (S43), if the index signal corresponding to the read out link index data is detected (S44) In this case, playback starts from the corresponding position detected while driving the tape at constant speed through the deck drive unit 30 (S49).

In addition, unlike the method of sequentially displaying one search screen in all screen areas as in the above-described embodiment, the controller 100 displays the entire external screen as a plurality of small areas as shown in FIG. 8. The virtual division is set, and the size of the corresponding video signal of the search screen which is read and converted from the RAM 43 is reconfigured to the divided small area so as to be reproduced and output to each area. By displaying all within one external video screen, the user can check the search screen at a glance and select from it.

The video recording method and the playback method thereof according to the present invention, which is made as described above, can quickly and accurately find a playback position that a user wants to start playing among various recording signals recorded on a recording medium during playback after recording. In addition, the user can visually easily determine whether the user wants to play, it is a very useful and convenient invention that can eliminate unnecessary time wasted by selecting and playing the unwanted screen by the judgment and error.

Claims (7)

Setting a search screen among recorded video screens; A second step of assigning and storing the image screen of the set time point and data indexing the same; And And a third step of recording an index signal corresponding to the stored index data on a recording medium. The method of claim 1, The second step is a video recording method for indexing, characterized in that the screen data is compressed and stored. The method of claim 1, And the searching screen setting step sets the video signal corresponding to the initial screen as a search screen at the start of recording. A first step of outputting a previously stored search screen data when a search request of a recording medium is requested; A second step of searching for a recording position of an index signal corresponding to the index data associated with the selected search screen when the search screen for outputting the image is selected; And And a third step of reproducing the video signal from the searched recording position. The method of claim 4, wherein The first step is to reproduce the indexed image, characterized in that for outputting the image by extending the compressed data of the previously stored search screen. The method of claim 4, wherein In the first step, the pre-stored search screen sequentially outputs a full screen image. The method of claim 4, wherein A method of reproducing an indexed image by dividing a display screen and outputting the previously stored screen data into a plurality of divided screen regions.