JP2004343201A - Recording device - Google Patents

Abstract

When encoding image data and recording the encoded image data on a recording medium, a good search / reproduction of the recorded image data is realized.
A recording device encodes moving image data to generate main image data, a high-speed data generating unit generates image data for high-speed reproduction of the main image data, and a reproduction position of the main image data. And management data processing means for generating search management data for associating the reproduction position of the high-speed reproduction image data with a main image file including main image data, a high-speed reproduction file including high-speed reproduction image data, There is provided recording means for generating a search management file including search management data, and independently recording the main image file, the high-speed reproduction file, and the search management file on a recording medium.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording device, and more particularly, to a device for recording image data.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known an apparatus for converting an image signal into a digital signal and recording and reproducing the digital signal on a magnetic tape, an optical disk, or the like. Among these apparatuses, particularly, an apparatus that records image data on a disk medium generally encodes the image data by the MPEG method and records it. The reason why the MPEG method is used is that the information amount of the moving image data can be efficiently compressed by using the motion compensation prediction coding between frames.
[0003]
The MPEG system divides an image of one frame into blocks called macroblocks, performs DCT processing and quantization processing on each block, and then performs variable-length coding. A large compression ratio is obtained by combining motion compensation prediction coding techniques between fields.
[0004]
Each frame of moving image data to be encoded is classified into three picture types, I, P, and B. An I picture is a frame for which intra-frame coding is performed, and can be coded independently without referring to information of other frames, but generally requires a larger code amount than B and P pictures. A P-picture is a frame for performing so-called inter-frame prediction encoding, which encodes a difference from an image signal motion-compensated and predicted from an image signal of an I or P picture preceding by one to several frames, and has a code amount that is smaller than that of an I-picture. Can be greatly reduced. A B-picture is a frame for performing bidirectional inter-frame predictive coding that performs prediction not only from a preceding I or P picture but also from a subsequent I or P picture, and further reduces the code amount compared to a P picture. Becomes possible.
[0005]
In order to improve the coding efficiency (reduce the amount of code), it is necessary to avoid using I-pictures and use B- and P-pictures as much as possible. However, since the B and P pictures are predictively encoded using image signals of other frames, if a transmission error occurs in the data of the reference frame, the subsequent data cannot be restored due to the influence of the error. Failure occurs.
[0006]
Therefore, in consideration of the effects of errors, it is necessary to insert an I picture that can be independently decoded only with its own frame at appropriate intervals. In consideration of these, in the MPEG encoding, for example, a picture configuration as shown in FIG. 20 is used. The repetition pattern of this picture configuration is called a GOP (Group Of Pictures).
[0007]
As described above, in the case where search reproduction is performed after the MPEG-encoded image signal is recorded on the disk medium, the search reproduction can be performed by moving the pickup in the radial direction, as described in Japanese Patent Application Laid-Open No. H11-163,036. is there. Then, this track movement is repeated at an appropriate timing, and search reproduction can be realized by decoding the aforementioned I picture.
[0008]
[Patent Document 1]
JP-A-7-226908
[0009]
[Problems to be solved by the invention]
However, in the MPEG system, in which the encoding efficiency and the image quality are emphasized, the GOP length is changed in the middle and the variable rate coding is performed. Therefore, the search and reproduction of the image data coded by the MPEG system and recorded on the disk medium are performed. When performing this, there is a problem that the I-picture is not recorded on the disc at a predetermined interval, and the search speed changes.
[0010]
In addition, if MPEG coding is used, the decoding procedure of I, B, and P pictures as described above is required, so that a complicated process is essentially required for the reverse search.
[0011]
Further, in a system for recording a signal on a track such as an optical disk, tracking is stabilized after the track is moved, and a considerable amount of time is required to find the beginning of an I-picture. There is a problem that realizing a high-speed search is complicated and difficult.
[0012]
An object of the present invention is to solve such a problem.
[0013]
Another object of the present invention is to realize good search and reproduction of recorded image data when the image data is encoded and recorded on a recording medium.
[0014]
[Means for Solving the Problems]
In the present invention, encoding means for encoding the input moving image data to generate main image data, high-speed data generating means for generating image data for high-speed reproduction of the main image data, Management data processing means for generating search management data for associating a reproduction position with a reproduction position of the high-speed reproduction image data; a main image file including the main image data; and a high-speed reproduction including the high-speed reproduction image data And a recording unit for generating a search management file including the search management data, and recording the main image file, the high-speed playback file, and the search management file on a recording medium.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 is a diagram showing a configuration of a video camera to which the present invention is applied. In the video camera according to the present embodiment, captured moving image data is encoded by the MPEG method and recorded on a memory card.
[0017]
In FIG. 1, first, the basic recording operation will be described.
[0018]
The imaging unit 101 converts the subject light incident through the lens into an electric signal using a solid-state sensor, converts the light into digital data, and performs various processes such as color separation, white balance, gamma correction, and aperture correction. Output to the display driver 105.
[0019]
In the shooting mode, the display driver 105 outputs moving image data obtained from the imaging unit 101 to the display unit 106 for display according to an instruction from the CPU 107.
[0020]
When an instruction to start recording is given by the operation unit 108, the COU 107 controls the encoding processing unit 102 to start encoding processing. The encoding processing unit 102 encodes the moving image data using the memory 103 according to the MPEG method, and outputs the encoded data to the recording / reproducing unit 104. Further, the encoding processing unit 102 extracts a frame in the input image data at a timing designated by the CPU 107, reduces the size of the frame, encodes the frame by intra-frame encoding, and generates search image data. The search image data is stored in the memory 103, read out at an appropriate timing, and output to the recording / reproducing unit 104.
[0021]
The recording / reproducing unit 104, according to the instruction of the CPU 107, converts a series of encoded moving image data (main moving image data) output from the encoding processing unit 102 between the recording start instruction and the recording stop instruction into one The data is recorded on the memory card M as a file. In addition, the image data for search generated along with the recording of the main moving image data is recorded on the memory card M as a file different from the file of the main moving image data.
[0022]
The CPU 104 issues an instruction to the encoding processing unit 102 to generate search image data along with the recording of the main image data, and a time for associating each frame of the search image data with a reproduction position in the main image data. Generate a search table. Then, after the recording of the main image data is stopped, the data of the time search table is output to the recording / reproducing unit 104, and is recorded on the memory card M as a file different from the main image data file and the search image data file.
[0023]
The recording / reproducing unit 104 records the files on the memory card M under the management of a file system such as UDF, FAT, and EXT2.
[0024]
The file system means a structure system including management information for managing a file and file data. By sharing this file system, recording and reproduction can be performed on different storage media or recording and reproduction devices.
[0025]
The main image data output by the encoding processing unit 102 is sent to the external I / F 109 as needed.
[0026]
Next, a process of generating search image data will be described with reference to FIG.
[0027]
FIG. 2 is a diagram illustrating each frame of the moving image data input to the encoding processing unit 102 after the start of recording, the encoded moving image data, and the state of the search image data generated at that time.
[0028]
In the present embodiment, one frame is selected from the input moving image data at regular intervals Tcst, and a frame (entry frame) corresponding to the first I picture of the GOP including the selected frame is extracted as search image data. I do.
[0029]
In FIG. 2, t1, t2, t3, and t4 are times at regular intervals Tcst, respectively, and 201 indicates a state of a frame of the input moving image data. In the input moving image data sequence 201, frames to which I, P, and B are added are frames processed as I pictures, P pictures, and B pictures in the encoding process of the MPEG system, respectively. Then, as a result of encoding the input moving image data 201 by MPEG, encoded data 202 is obtained. As shown in FIG. 2, in the MPEG encoding, the frame order of the input image data 201 and the frame order of the encoded data 202 are different.
[0030]
In the present embodiment, frames corresponding to the timings t1, t2, t3, and t4 in FIG. 2 are selected, and the first I picture of the GOP including each selected frame is extracted as a search image. Then, the first I-picture of the GOP at every fixed interval Tcst is collected to generate a search image data sequence 203, which is recorded as a file separate from the main image data.
[0031]
Next, a time search table for associating each frame of the search image data thus generated with a reproduction position (GOP) in the main image data will be described.
[0032]
FIG. 3 is a diagram showing a state of the time search table.
[0033]
The time search table in FIG. 3 includes a file creation time in which the main image data corresponding to the table is created, a reproduction time of the main image data, an interval time Tcst for generating search image data, a reproduction time of one frame, It consists of the number of GOPs included in the main image data file, GOP information on each GOP, the number of entry frames included in the search image data, and entry information on each entry frame.
[0034]
The GOP information describes the size Ens of the entry frame, the GOP reproduction time Tgop, and the GOP size Gs for each GOP. The entry information corresponds to GOP_ID for identifying the GOP including the entry frame, and corresponds to Tcst in the GOP. The entry offset EFdif indicating the difference between the specified frame and the entry frame, and the offset Gofs indicating the data amount from the head to the head position of this GOP in the main image data are sequentially described.
[0035]
The CPU 107 generates such a time search table as the moving image data is recorded. Then, by referring to the time search table, the entry frame reproduction position in the main image data corresponding to each frame in the search image data can be calculated in byte units. Therefore, it becomes possible to start the reproduction of the main image data from the reproduction position corresponding to the designated frame in the search image data.
[0036]
In this embodiment, the search image data is encoded by intra-frame encoding. At this time, encoding is performed so that the image data of each frame has a fixed length. It is also possible to add management data such as the file creation time, the size of the encoded frame, and the frame interval to the beginning of the file of the search image data.
[0037]
In the present embodiment, the extraction interval Tcst of the entry frame of the search image is set to be equal to or longer than the nGOP period (n is an integer of 1 or more), but may not be synchronized with the GOP period. This Tcst may be arbitrarily specified according to a search reproduction speed (magnification) desired by the user.
[0038]
Thus, the search image extraction timing for each Tcst is not included a plurality of times in one GOP period. Here, if n = 1, one frame is extracted for each GOP to generate search image data. When one GOP is composed of f frames, the reproduction speed of the search image data is f Double speed.
[0039]
FIG. 4 shows a directory structure on the memory card M according to the present embodiment.
[0040]
In this embodiment, a dedicated directory called MOVE in this embodiment is created under the ROOT directory. By using a unified name for the dedicated directory, other products and peripheral devices that understand the method of the present embodiment can use the reproduction function unique to the present embodiment below this directory.
[0041]
Each file group to be recorded is stored under the MOVE directory. MOV001. mpg is the main movie file, MOV001. sch is an image file for searching the main moving image file, MOV001. tbl is a time search table file that associates each frame of the search image file with the reproduction position of the main image file. In this way, by using the same yyy number of MOVyyy, the moving image, the search image, and the files of the time search table can be stored in association with each other.
[0042]
The processing of the CPU 107 during the above-described recording will be described with reference to the flowchart of FIG.
[0043]
When a recording start instruction is given, first, a main image data file, a search image file, and a time search table file are newly created in the MOVE directory by the recording / reproducing unit 104 as shown in FIG. 4 (step S501). The main image data is encoded and recorded (step S502). Next, it is determined whether a predetermined period Tcst for extracting image data for search has elapsed (step S503). When the Tcst period has elapsed, the entry frame is extracted from the moving image data and encoded as described above. Thereafter, it is recorded as search image data (step S504). Then, according to the extracted entry frame, the entry information shown in FIG. 3 is added to the time search table (step S505).
[0044]
Then, the presence or absence of the recording stop instruction is detected, and if there is no stop instruction, the process returns to S503 (step S506).
[0045]
If Tcst has not elapsed in S503, the flow advances to S506 to detect a recording stop instruction.
[0046]
If there is a recording stop instruction in S506, each data relating to the main image data is added to the time search table (step S507), necessary data is added to each file and recorded, then the file is closed and the processing is ended. (Step S508).
[0047]
Next, processing at the time of reproduction will be described.
[0048]
First, an operation at the time of normal reproduction in which one of a plurality of files recorded on the memory card M is selected and reproduced will be described.
[0049]
When the user operates the operation unit 108 to specify a file to be reproduced, the CPU 107 controls the recording / reproduction unit 104 to reproduce the specified main image data file from the memory card M. The recording / reproducing unit 104 analyzes the reproduced file and outputs main image data to the encoding processing unit 102. The encoding processing unit decodes the reproduced main image data to expand the amount of information, and causes the display driver 105 to display the reproduced image on the display unit 106.
[0050]
Next, processing at the time of search reproduction will be described.
[0051]
First, as described above, when a user instructs search reproduction using the operation unit 108 in a state where a normal reproduction is performed by designating a file, the CPU 107 controls the recording / reproduction unit 104 to perform main reproduction. The file of the time search table corresponding to the image data file is reproduced and stored in the memory inside the CPU 107.
[0052]
Next, the CPU 107 detects the number of frames F1 from the head of the frame being displayed (reproduced) at the time when the search reproduction is instructed in the main image data. The number of frames F1 from the beginning can be detected by the CPU 107 referring to the time code added to each frame of the main image data.
[0053]
Then, based on the number of frames from the head and the extraction interval Tcst of each frame of the search image data described in the time search table, the CPU 107 determines the search image data corresponding to the frame at the time of the search instruction. The position of the frame is determined as follows.
[0054]
That is, the frame interval N is obtained from the search frame selection interval Tcst. That is, it is calculated that search image data is selected every N frames in the main image data sequence. If the data amount of each frame of the search image data is M bytes, the position (the number of bytes) FS from the head of the corresponding frame in the search image data is
FS = M × (F1 / N)
Is required.
[0055]
When the reproduction start frame position in the search image data is thus determined, the CPU 107 controls the recording / reproduction unit 104 to reproduce the search image data recorded on the memory card M from the designated position. , To the encoding processing unit 102.
[0056]
The encoding processing unit 102 decodes the reproduced search image data and outputs the decoded image data to the display driver 105.
[0057]
In addition, the CPU 107 controls the display driver 105 in response to an instruction to start search reproduction, generates a display screen illustrated in FIG. 6, and displays the display screen on the display unit 106.
[0058]
In the present embodiment, when a search reproduction instruction is issued, the display is performed in a two-screen configuration including a display screen for normal reproduction and a display screen for search reproduction as shown in FIG.
[0059]
In FIG. 6, reference numeral 601 denotes a display screen for normal reproduction, and 602 denotes a display screen for search reproduction. When there is an instruction for search reproduction during normal reproduction, the display driver 105 generates a sub-screen 602 and displays the reproduced search image on the sub-screen 602. At this time, bar information 603 indicating the current playback position for the entire file is also displayed.
[0060]
Further, when there is a search reproduction instruction, CPU 107 suspends reproduction of the main image data, and displays the image of the frame at the start of the search as a still image on parent screen 601 in FIG.
[0061]
In this state, when the user operates the operation unit 108 to give an instruction for normal reproduction, the CPU 107 uses the time search table to display the main image corresponding to the current frame of the search image displayed on the child screen 602. Calculate the data reproduction position.
[0062]
That is, the CPU 107 detects the number of frames from the beginning of the currently reproduced search data, and detects time search information corresponding to the detected number of frames from the time search table. Then, from the GOP offset data described in the corresponding time search information, the number of bytes from the head in the main image data of the GOP at the reproduction start position is detected.
[0063]
Then, the recording / reproducing unit 104 is controlled to start reproducing the main image data from the first frame of the GOP corresponding to the detected reproduction start position. Further, the CPU 107 controls the display driver 105 to delete the child screen 602 and the bar information 603 in FIG. 6 and display the reproduced main image on the display unit 106.
[0064]
Next, the processing of the CPU 107 during the above-described reproduction will be described with reference to the flowchart of FIG.
[0065]
In FIG. 7, when there is a reproduction instruction, the designated main image file is reproduced from the memory card M and displayed (step S701). In this state, an instruction for search reproduction is detected (step S702). If there is no search instruction, an instruction to stop reproduction is further detected (step S712). When a search reproduction instruction is issued in S702, the time search table is reproduced (step S703), and a reproduction start position in the search image data is calculated (step S705). Then, reproduction of the search image data is started from the calculated reproduction start position (step S705), and reproduction of the main image data is temporarily stopped (step S706), as shown in FIG. And the still image of the main image data is displayed on the parent image (step S707).
[0066]
In this state, a normal reproduction instruction is detected (step S708). If there is no normal reproduction instruction, an instruction to stop reproduction is further detected (step S713).
[0067]
When an instruction for normal reproduction is detected in S708, a reproduction start position of the main image data is calculated from the time search table (step S709), and reproduction of the main image data is started from the calculated reproduction start position (step S710). Then, the display of the child screen is stopped and the main image is displayed (step S711).
[0068]
If there is an instruction to stop the reproduction in S712 and S713, the reproduction of the image data is stopped and the process ends (step S714).
[0069]
As described above, according to this embodiment, separately from the main image data, search image data composed of frames extracted at regular intervals from the main image data is generated, and this is recorded as a file separate from the main image data. ing. Therefore, it is possible to realize a good search / reproduction process of image data encoded by inter-frame encoding such as MPEG. Further, since the search image data is recorded as a separate file, the processing load during reproduction does not increase as compared with during normal reproduction.
[0070]
In particular, when a disk medium is used, the search data does not need to be skipped at high speed in the radial direction during search reproduction, so that search data can be reproduced and displayed quickly.
[0071]
In addition, since the search image data is recorded as a file separate from the main image data, even if the device does not have a function of reproducing the main image data at high speed, it is possible to reproduce the search image data. Search reproduction can be easily realized.
[0072]
In this embodiment, the main image and the search image are displayed in the form shown in FIG. 6 during the search reproduction, and the reproduction position of the search image is displayed by bar information. May be displayed, and the present invention is not limited to the bar information, and may take other forms. It is also possible to display information indicating that search reproduction is being performed.
[0073]
In addition, during the search reproduction, the reproduction of the main image displayed on the main screen is temporarily stopped and displayed as a still image. However, the present invention is not limited to this. You may do so.
[0074]
Further, in the present embodiment, the search image is displayed on the small screen as shown in FIG. 6 during the search reproduction, but the present invention is not limited to this, and the search image may be switched from the main image to the search image during the search reproduction. In this case, when generating the search image data, it is necessary to record without reducing the screen size. Even when the image is switched to the search image and displayed, the present embodiment records the time search table indicating the correspondence between each frame of the search image data and the reproduction position in the main image data. By referring to the time search table, it is possible to easily calculate the reproduction position in the main image data corresponding to each frame of the search image data.
[0075]
Further, in the present embodiment, the case where a memory card is used as a recording medium has been described. However, other random access media that handles data as a file, such as an optical disk or a magnetic disk, can be used.
[0076]
Next, a second embodiment of the present invention will be described.
[0077]
In the present embodiment, two search playback modes having different playback speeds (magnifications) are prepared, and when the search mode with the fast playback speed is designated, the search using the search image data is performed as described in the first embodiment. When a search process is executed and a search playback mode with a slower playback speed is specified, search playback is realized by thinning out main image data.
[0078]
In this embodiment, the configuration of the video camera and the processing at the time of recording are the same as those in the first embodiment. The processing at the time of normal reproduction is the same as that of the first embodiment.
[0079]
Hereinafter, the processing of the CPU 107 accompanying the search reproduction processing will be described.
[0080]
FIG. 8 is a flowchart showing a search reproduction process by the CPU 107 in the present embodiment. In the present embodiment, there are a first search mode in which the playback speed is fast and a second search mode in which the playback speed is slower than the first search mode, and the user switches these first and second search modes to the operation unit 108. Can be specified arbitrarily.
[0081]
In FIG. 8, when there is an instruction for normal reproduction, the designated main image file is reproduced and displayed (step S801). In this state, the first search mode instruction (high-speed search) is detected (step S802). If there is no instruction for the first search mode, the second search mode instruction (low-speed search) is further detected (step S803). .
[0082]
When an instruction for the second search mode, which is a low-speed search, is given, the recording / reproducing unit 104 is controlled to reproduce the main image data reproduced and decoded for each frame corresponding to the reproduction speed specified in the second search mode. The display is thinned out (step S804). For example, when the search reproduction speed is 5 times speed, only one of the reproduced and decoded main image data is selected and displayed in five frames.
[0083]
In this state, switching to normal reproduction is detected (step S805), and when there is an instruction to switch to normal reproduction, the main image data is reproduced and displayed at normal speed (step S806).
[0084]
If the first search mode instruction is issued in S802, the search processing using the search image data described with reference to FIG. 7 is executed (step S807). Specifically, the process proceeds to S703 in FIG. 7, and after the process of S711 ends, returns to S802.
[0085]
When an instruction to stop reproduction is detected in steps S808 and S809, reproduction of image data is stopped and the processing ends (step S810).
[0086]
As described above, according to the present embodiment, the first high-speed search mode having a relatively high reproduction speed and the second high-speed search mode having a relatively low reproduction speed are prepared, and in the second search mode, By performing thinning-out reproduction of the main image data, search reproduction at a speed lower than the reproduction speed of the search image data can be realized.
[0087]
As described above, when the playback speed is relatively low, the load on the playback device is small, and it is not necessary to separately create search image data for low-speed search.
[0088]
When the reproduction speed is high, the search reproduction process using the search image data is executed in the same manner as in the first embodiment. Therefore, good search reproduction of image data encoded by inter-frame encoding such as MPEG is performed. Processing can be realized.
[0089]
In the present embodiment, two search playback modes having different playback speeds are facilitated. However, the present invention is not limited to this, and it is configured so that the user can designate an arbitrary playback speed, and the designated playback speed is set to a predetermined threshold. If it is slower, the main image data may be thinned out and displayed according to the specified playback speed, and if it is faster than the threshold value, a search playback process using the search image data may be executed.
[0090]
【The invention's effect】
As described above, according to the present invention, when image data is encoded and recorded on a recording medium, good search and reproduction of the recorded image data can be realized.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a video camera to which the present invention is applied.
FIG. 2 is a diagram illustrating a state of image data handled in the embodiment.
FIG. 3 is a diagram showing a state of a time search table.
FIG. 4 is a diagram showing a directory structure in the embodiment.
FIG. 5 is a flowchart illustrating a recording process.
FIG. 6 is a diagram showing a display screen at the time of a search.
FIG. 7 is a flowchart illustrating a search process.
FIG. 8 is a flowchart illustrating a search process according to another embodiment.

Claims (25)

Encoding means for encoding the input moving image data to generate main image data,
High-speed data generating means for generating high-speed reproduction image data of the main image data,
Management data processing means for generating search management data for associating a reproduction position of the main image data with a reproduction position of the high-speed reproduction image data,
Generate a main image file including the main image data, a high-speed reproduction file including the high-speed reproduction image data, and a search management file including the search management data, the main image file, the high-speed reproduction file and Recording means for recording the search management file on a recording medium. The high-speed data generating means selects one frame at regular intervals from the input moving image data, and generates the high-speed reproduction image data using a frame extracted based on the selected frame. The recording device according to claim 1, wherein The encoding unit encodes the moving image data using an intra-frame encoding process and an inter-frame encoding process, and the high-speed data generating unit performs the intra-frame encoding process near the selected frame. 3. The recording apparatus according to claim 2, wherein frames are extracted for the image data for high-speed reproduction. 4. The recording apparatus according to claim 3, wherein the search management data includes position information indicating a position of an intra-coded frame in the main image data corresponding to each frame in the high-speed reproduction image data. . 5. The recording apparatus according to claim 4, wherein the position information indicates a position of an intra-coded frame in the main image data by a data amount from a head of the main image data. The encoding means encodes the moving image data in units of a GOP consisting of one intra-frame encoding processing frame and n or more inter-frame encoded frames (n is a natural number), and generates the high-speed data. 3. The recording apparatus according to claim 2, wherein the means extracts the intra-coded frame in the GOP including the selected frame for the image data for high-speed reproduction. 7. The recording apparatus according to claim 6, wherein the high-speed data generating means generates the high-speed reproduction image data using the intra-frames extracted one frame at a time for each GOP. 7. The recording apparatus according to claim 6, wherein the search management data includes position information indicating a position of a first frame of a GOP corresponding to each frame in the image data for high-speed reproduction. 9. The recording apparatus according to claim 8, wherein the position information indicates a position of a head frame of a GOP corresponding to each frame in the high-speed reproduction image data by a data amount from a head of the main image data. The high-speed data generating means selects one frame at every specified fixed period equal to or longer than an NGOP period (N is an integer of 1 or more), and the high-speed data generating means selects one frame in the GOP including the selected frame. 3. The recording apparatus according to claim 2, wherein an encoded frame is extracted for the image data for high-speed reproduction. 2. The recording apparatus according to claim 1, wherein the search management data includes position information indicating a position of a frame in the main image data corresponding to each frame in the image data for high-speed reproduction. 12. The recording method according to claim 11, wherein the position information indicates a position of a frame in the main image data corresponding to each frame in the image data for high-speed reproduction by a data amount from a head of the main image data. apparatus. The recording means adds a common name to the main image data file and a high-speed reproduction file and a search management file corresponding to the main image data file, and records them with different extensions. The recording device according to claim 1, wherein Reproduction means for reproducing data from a recording medium on which the main image file, the high-speed reproduction file, and the search management file are recorded by the recording device according to claim 1;
Mode setting means for setting a normal reproduction mode for reproducing the main image file by the reproduction means and a high-speed reproduction mode for reproducing the high-speed reproduction file by the reproduction means;
In response to an instruction to switch from the high-speed playback mode to the normal playback mode, a playback position in the main image data corresponding to the designated playback position in the high-speed playback image data based on the search management data. And a control means for controlling the reproduction means so as to start the reproduction of the main image data from the determined reproduction position. The search management data includes position information indicating a position of a frame in the main image data corresponding to each frame in the image data for high-speed playback, and the control unit uses the position information to control the position of the frame in the main image data. The playback device according to claim 14, wherein a playback position is determined. 16. The reproducing apparatus according to claim 15, wherein the position information is described as a data amount from a head of a frame in the main image data corresponding to each frame in the image data for high-speed reproduction. The control means further determines a reproduction position in the high-speed reproduction image data corresponding to the specified reproduction position in the main image data in response to an instruction to switch from the normal reproduction mode to the high-speed reproduction mode. 15. The reproducing apparatus according to claim 14, wherein said reproducing means is controlled to start reproduction of said high-speed reproduction image data from said reproduction position. The image data for high-speed reproduction is generated using a frame extracted from the main image data based on a frame selected at regular intervals, and the search management data includes interval information indicating a selection interval of the frame. 18. The reproduction according to claim 17, wherein the control means determines a reproduction position in the high-speed reproduction image data corresponding to the designated reproduction position in the main image data using the interval information. apparatus. 15. The reproducing apparatus according to claim 14, further comprising a low-speed search mode for thinning out and reproducing frames of the main image data according to a specified reproducing speed. The mode setting means can arbitrarily set a reproduction speed, and the control means sets the low speed search mode when a reproduction speed lower than a predetermined reproduction speed is set by the mode setting means. 20. The reproducing apparatus according to claim 19, wherein when the reproducing speed equal to or higher than the reproducing speed is set, the high-speed reproducing mode is set. A main image file including main image data obtained by encoding moving image data, and a reproduction unit for reproducing a high-speed reproduction file including high-speed reproduction image data of the main image data from a recording medium;
Mode setting means for setting a normal reproduction mode for reproducing the main image file by the reproduction means and a high-speed reproduction mode for reproducing the high-speed reproduction file by the reproduction means;
Display means for displaying an image according to the main image data and the high-speed reproduction image data reproduced by the reproduction means,
In response to an instruction to switch from the normal reproduction mode to the high-speed reproduction mode, reproduction of the high-speed reproduction image data is started, and a sub-screen is provided on a display screen to display the high-speed reproduction image on the sub-screen. And a control unit for controlling the reproduction unit and the display unit to perform the reproduction. The control unit further pauses reproduction of the main image data according to an instruction to switch from the normal reproduction mode to the high-speed reproduction mode, and freezes a normal reproduction image according to the main image data displayed on the main screen. 22. The playback apparatus according to claim 21, wherein the playback unit and the display unit are controlled so as to be displayed as an image. An encoding step of encoding the input moving image data to generate main image data,
A high-speed data generation step of generating image data for high-speed reproduction of the main image data,
A management data processing step of generating search management data for associating a playback position of the main image data with a playback position of the high-speed playback image data;
Generate a main image file including the main image data, a high-speed reproduction file including the high-speed reproduction image data, and a search management file including the search management data, the main image file, the high-speed reproduction file and Recording the search management file on a recording medium. A reproduction step of reproducing data from a recording medium on which the main image file, the high-speed reproduction file, and the search management file are recorded by the recording device of claim 1;
A mode setting step of setting a normal reproduction mode for reproducing the main image file by the reproduction step and a high-speed reproduction mode for reproducing the high-speed reproduction file by the reproduction means;
In response to an instruction to switch from the high-speed playback mode to the normal playback mode, a playback position in the main image data corresponding to the designated playback position in the high-speed playback image data based on the search management data. And controlling the playback means to start playback of the main image data from the determined playback position. A main image file including main image data obtained by encoding moving image data, and a reproduction step of reproducing a high-speed reproduction file including high-speed reproduction image data of the main image data from a recording medium;
A mode setting step of setting a normal reproduction mode for reproducing the main image file by the reproduction means and a high-speed reproduction mode for reproducing the high-speed reproduction file by the reproduction means;
A display control step of displaying an image according to the main image data and the high-speed reproduction image data reproduced by the reproduction means on a display device,
In response to an instruction to switch from the normal reproduction mode to the high-speed reproduction mode, reproduction of the high-speed reproduction image data is started, and a sub-screen is provided on a display screen to display the high-speed reproduction image on the sub-screen. A reproducing method characterized by:

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