JP2004328218A - Playback device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily detect a target scene at the time of high speed searching. <P>SOLUTION: A device reproduces moving picture data from a recording medium. At a high speed searching mode where high speed reproduction is performed by thinning a part of frames in moving picture data and reproducing data, data are divided into an important part of moving picture data and other parts. The thinning rate of the frame in the important part is made smaller than that in the other part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a playback device, and more particularly to a process in a high-speed search mode.
[0002]
[Prior art]
2. Description of the Related Art In recent years, a video summarization method that supports searching for a video signal, quick viewing, and the like has been proposed.
[0003]
For example, the video summarizing method described in Patent Literature 1 is a digest video reproducing method in which only a part of a video shot is reproduced one after another. As shown in FIG. 14, the position of the digest part to be reproduced is changed according to the number of seconds of each video shot. This makes it possible to reproduce only the important part of the shot predicted from the length of the video shot.
[0004]
Further, the method described in Patent Literature 2 divides a high-speed operation section from a video shot into a high-speed operation section in which an object moves at high speed and a long-time similar section in which a similar scene continues, and sets the high-speed operation section to a normal fast-forward operation. This is a method of reproducing at a low speed, and reproducing a long similar section at a higher speed than usual.
[0005]
Note that a shot here indicates a unit for dividing video data. The break points at which video data is divided into shots include start and end points of shooting with a video camera, connection points of edited images, start and end points of video files, points marked by a user (markers), and the like. It is assumed that the image changes significantly or is considered important.
[0006]
[Patent Document 1]
JP-A-9-270997
[Patent Document 2]
JP-A-8-251540
[0007]
[Problems to be solved by the invention]
However, in the digest video reproduction method of Patent Document 1, since only a part of the video shot is reproduced one after another, it is difficult to search for a desired scene that is not included in the digest, even if the outline of the entire video can be grasped.
[0008]
In addition, in the video summarization method disclosed in Patent Document 2, it is possible to maintain a subjective playback speed in order to adaptively change a relative playback speed according to the similarity of an image. Therefore, it is necessary to read all image data once, perform summarization processing, and save the summary data in a file server or the like, which is not suitable for summarizing and searching in real time .
[0009]
An object of the present invention is to realize a high-speed reproduction search capable of easily detecting a target scene without lowering visibility even at the time of a high-speed search in consideration of such a problem.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the present invention, when reproducing moving image data from a recording medium, in the high-speed search mode in which high-speed reproduction is performed by thinning out some frames of the moving image data and reproducing. The image data is divided into a first period and a second period, and the frame thinning rate in the first period is smaller than the frame thinning rate in the second period.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
First, a basic embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of a reproducing apparatus 200 to which the present invention is applied.
[0013]
In FIG. 2, reference numeral 201 denotes a recording medium on which compressed video data is recorded. In this embodiment, the recording medium is a disk medium such as a DVD. Reference numeral 202 denotes a demodulation / error correction circuit that acquires a video signal read by an optical pickup from the recording medium 201 and performs signal processing such as data demodulation and error correction, 203 denotes a buffer memory, and 204 clamps the recording medium 201. Mechanism control circuit that controls a drive mechanism system including a motor that drives to rotate and an optical pickup, 205 is a separation circuit that separates video signals into video and audio signals, 206 is a video decoder, 207 is an audio decoder, and 208 is a system. A system control circuit 209 for controlling the entire system is an operation unit having various operation switches.
[0014]
First, normal reproduction processing will be described. When the user operates the operation unit 209 to instruct reproduction, the operation unit 209 transmits the reproduction request to the system control circuit 208.
[0015]
The system control circuit 208 includes a CPU that performs overall control, various working memories, and a ROM that stores programs and data that can be read and executed by the CPU. When the system control circuit 208 receives a reproduction request from the operation unit 209, it controls the mechanism control circuit 204 as described below, and reads data from the recording medium 201 through an optical pickup.
[0016]
For example, when the system control circuit 208 receives a fast-forward playback request, the system control circuit 208 indicates a track position of data to be read from the recording medium 201. The mechanism control circuit 204 adjusts the speed of the motor according to the position of the truck instructed by the system control circuit 208, and controls the movement of the position of the optical pickup by controlling the optical pickup. When the correct position of the track is detected, the CPU waits for rotation until a desired physical sector is stored, and reads a video signal from the physical sector.
[0017]
The demodulation / error correction circuit 202 performs various signal processing such as amplification, demodulation, and error correction on the read video signal, and stores the video data in the buffer memory 203 in logical block units. The separation circuit 205 receives the video data transferred from the buffer memory 203, separates the video data into individual stream portions such as video and audio, and sends them to the respective decoders.
[0018]
The video decoder 206 expands the video data according to a predetermined method (for example, MPEG2) and outputs a video signal. Similarly, the audio decoder decodes audio data according to a predetermined method and outputs an audio signal.
[0019]
Next, a description will be given of a process in the case where high-speed search reproduction is performed in the reproduction apparatus 200 configured as described above.
[0020]
Hereinafter, a high-speed search process controlled by the system control circuit 208 in the reproducing apparatus of FIG. 2 will be specifically described with reference to FIGS.
[0021]
In FIG. 1, reference numeral 100 denotes the entire video data recorded on the recording medium 201, and a section 101 denotes one shot in the video data. That is, the entire video data 100 is considered as a set of video shots. In addition, gray 102 in the video data is video data to be reproduced in the high-speed reproduction mode, and 103 is video data to be thinned out without being reproduced.
[0022]
Reference numeral 110 denotes an image frame configuration in the shot 101, 111 denotes the first frame of the shot, 112 denotes a reproduced frame reproduced in high-speed search in the drawing, and 113 denotes a reproduced frame reproduced in high-speed search. The figure shows a non-decimated frame. In addition, the video data indicates data that is later in time as going to the right.
[0023]
FIG. 3 is a flowchart for determining whether or not to reproduce a frame to be processed during a high-speed search. In FIG. 3, i is a frame counter, N is the number of frames to be thinned out at the time of high-speed search, and M is the number of frames reproduced at the head of a shot at the time of high-speed search.
[0024]
In the following, a case where N = 12 and M = 4, that is, a high-speed search process at approximately 12 × speed will be described as an example. The initial value of i is 0.
[0025]
First, in step S301, when the frame counter i is not equal to N for the frame to be processed, the process proceeds to step S302, and when i is equal to N, the process proceeds to step S303. In step S302, it is checked whether the processing target frame is within M frames (four frames) from the top frame of the shot. If the frame to be processed is within M frames from the top frame of the shot, the process proceeds to step S303; otherwise, the process proceeds to step S305. In step S303, the data of the frame to be processed is read from the recording medium 201, decoded, and output. In step S304, the frame counter i is initialized to 0. In step S305, the frame to be processed is skipped without being read. In step S306, the frame counter i is incremented. In step S307, the frame to be processed is advanced by one frame, and the process returns to step S301.
[0026]
FIG. 1 shows the relationship between the frame to be reproduced as a result of the above processing and the frame to be skipped.
[0027]
FIG. 1 shows that four frames at the start of each shot are always reproduced, and thereafter, one frame of video data is reproduced every 12 frames.
[0028]
In this way, by always displaying a predetermined number of frames (M frames) at the beginning of each shot, the entire contents of the shot can be grasped by skip reproduction, and the important part at the beginning of the shot can be skipped. It can be displayed.
[0029]
As another method, only important scenes of each shot are continuously reproduced and displayed in predetermined frames (M frames), and data other than important scenes is skip-reproduced (one frame is reproduced every N frames). You may. In this case, by reproducing and displaying the important scene portion continuously for a predetermined frame, the effect of improving the visibility even during high-speed reproduction can be obtained.
[0030]
By the way, in the above-described example, a predetermined number of frames from the head of the shot are always displayed from the viewpoint that an important scene for grasping the content of each shot is a start portion of the shot. This is because, for example, when the user has marked (separated) the important scenes in the video data at home using a video camera or divided the shots into important shots, the important scenes at the beginning of the shots This is because it is expected that there are many cases.
[0031]
However, the start of the shot is not always important, and the end of the shot may be important.
[0032]
For example, in the goal scene of a live broadcast of soccer, the shooting angle changes a short time after the goal is determined, and the shot switches. In this case, since the important scene (goal scene) is the last part of the shot, when the goal scene is searched by the above-described high-speed search method, it is expected that only some frames of the goal scene will be reproduced. Therefore, the above-described high-speed search method may deteriorate search efficiency. Therefore, as described below, it is necessary to change the important scene in each shot according to the type of video.
[0033]
In FIG. 4, reference numeral 400 denotes the entire video data recorded on the recording medium 201, and a section 401 denotes one shot in the video data. Further, gray 402 in the video data is playback data during high-speed search, and 403 indicates image data to be skipped without being played back.
[0034]
Reference numeral 410 denotes an image frame configuration in the shot 401, 411 denotes the last frame of the shot, 412 denotes a reproduced frame in gray during high speed search, and 413 denotes a thinned frame that is not reproduced during high speed search. I have. In addition, the video data indicates data that is later in time as going to the right.
[0035]
FIG. 4 shows a relationship between a reproduced frame (gray) and a thinned frame when it is considered that an important scene is present at the end of a shot at the time of high-speed search.
[0036]
In FIG. 4, the last four frames of the shot are always displayed instead of the top of the shot. With this, in the case of data in which an important scene is at the end of each shot, the last important scene portion of each shot is always reproduced by a predetermined number of frames during high-speed reproduction. Can be improved.
[0037]
If the important scene in the shot is predicted to be in the middle of the shot, the middle part of the shot is always reproduced by a predetermined frame as shown in FIG. 5B, it is possible to realize a high-speed search in which important scenes are not easily overlooked by always reproducing both the start and end portions in a predetermined frame as shown in FIG. 5B.
[0038]
As described above, the location of an important scene in a shot may differ depending on whether the data is data captured by a video camera, edited data, or data transmitted by a television broadcast.
[0039]
Therefore, it is necessary to detect where these important scenes are in the shot. As this method, a method of determining the content of each shot based on an existing algorithm and estimating which part of each shot contains the important scene may be used. Alternatively, a method in which means for switching information of important scenes is provided in the operation unit 209 and the user can manually adjust the information may be used. At this time, as shown in FIG. 6, which part of the shot is reproduced as an important scene on the screen of the output device, the user can determine while viewing the GUI displayed on the screen. Is also good.
[0040]
Further, when the information of these important scenes is added as metadata in the video data, the system control circuit 208 may receive the information of the important scene and switch the display portion of the important scene. .
[0041]
Next, a method of determining the number of frames for reproducing an important scene portion in a shot will be described with reference to FIG.
[0042]
FIG. 7A is a graph showing the relationship between the reproduction speed and the number of frames for reproducing an important scene in a shot. FIG. 7B is a graph showing the relationship between the length of the shot and the number of frames for outputting the important scene in the shot. It is a figure showing a relation.
[0043]
First, as for the relationship between the reproduction speed and the number of frames for reproducing important scenes in a shot, as shown in FIG. 7A, the number of frames for displaying important scenes in a shot increases as the reproduction speed increases. However, when the reproduction speed is equal to or lower than the predetermined speed s, the important scene in the shot is not reproduced.
[0044]
The reason for this is that, in the case of relatively low-speed reproduction such as the conventional triple-speed reproduction shown in FIG. This is because it is considered that a sufficient number of frames are included. In addition, if the important scenes of the shots are reproduced without thinning out at this reproduction speed, there is a problem that the reproduction speed is reduced. Therefore, when the playback speed n is equal to or lower than the predetermined speed s, normal n-times speed playback is performed in which one frame of video data is thinned out and played back every n frames.
[0045]
On the other hand, in the case of relatively high-speed reproduction such as the 12-times reproduction shown in FIG. 8B, in this example, since there are only four frames reproduced in one shot, it is difficult to grasp the contents of the shot. Conceivable. Further, when the reproduction speed is increased to 20 times or 50 times, frames in a shot may not be reproduced at all.
[0046]
As a result of the increase in the reproduction speed, if the number of display frames in a shot is reduced and the correlation between the reproduced frames is lost, it becomes difficult to recognize an image.
[0047]
Therefore, as shown in FIG. 5A, the number of display frames of important scenes in a shot is increased. However, when the number of display frames of the important scene is increased, the reproduction speed is also reduced. Therefore, an upper limit is set so that the important scene is not displayed when the number of frames exceeds a predetermined number.
[0048]
In this way, only when the reproduction speed n increases and becomes equal to or higher than the reproduction speed s at which it becomes difficult to grasp the content of each shot, the important scenes within the shot are continuously reproduced for several frames. Efficient high-speed reproduction search according to the
[0049]
Next, the relationship between the number of frames in a shot and the number of playback frames of an important scene in the shot will be described.
[0050]
FIG. 9 is a view showing each shot in the video data.
[0051]
9, reference numeral 900 denotes the entire video data, 902 denotes a reproduced frame when the video data 900 is decimated and reproduced at equal intervals, and 903 denotes a decimated frame. Also, each shot of the 910 and 911 video data 900 is shown.
[0052]
Here, in the case of a high-speed playback method as shown in FIG. 9 in which frames are skipped at equal intervals and an image is played back, only one frame is played back for shot 1 having a small number of frames, and shot 2 is used for shot 2 having a relatively large number of frames. Five frames will be reproduced. At this time, since only one frame of the image of the shot 1 is reproduced, the content of the shot cannot be grasped, and it may be difficult to search for a desired scene.
[0053]
Therefore, as shown in FIG. 7B, as the number of frames in a shot decreases, the number of display frames of important scenes in the shot increases. As a result, the important scene of the shot is displayed long even in a short shot, so that it is easy to grasp the content of the shot even during high-speed playback. However, since the number of display frames of the important scene does not exceed the number of frames of the shot, a value equal to or less than the number of frames f of each shot is set as an upper limit.
[0054]
On the other hand, when the number of frames in a shot increases, the number of frames reproduced like shot 2 also increases. Therefore, even if the number of frames reproducing important scenes of the shot is reduced, the content of the shot can be grasped. Control to reduce the number of playback frames of important scenes. In this case as well, a lower limit is set so that the number of reproduced frames of the important scene does not become less than a predetermined number.
[0055]
It should be noted that, besides this, among the data shot by a video camera at home, data having an extremely small number of frames in one shot may be regarded as a mistake, and may be controlled so as not to be reproduced as an important scene.
[0056]
In addition, taking into account both the playback speed and the length of the shot, for example, the number of frames to be played back within the shot is calculated from the playback speed and the length of the shot, and the number of playback frames of the important scene is calculated according to the number of frames. The determination method may be used.
[0057]
Next, a description will be given of a method of calculating the similarity of each shot and determining the number of reproduction frames of the important scene of each shot based on the similarity.
[0058]
FIG. 10 is a diagram showing the relationship between the similarity between frames in each shot and the number of reproduced frames of an important scene. As shown in FIG. 10, as the similarity between frames in each shot is higher, it is determined that there are more redundant portions, and the number of frames reproduced from the important scene is reduced. However, the number of playback frames of the important scene is determined as an upper limit, which does not exceed the number of shot frames. Also, a lower limit is set so that an important scene is always displayed even when the similarity increases.
[0059]
As a method of calculating the similarity of each shot, image data (or a part of the image data) in the shot may be read and obtained by accumulating difference data. You can use existing algorithms to determine the degree. Alternatively, a method may be used in which the similarity of each shot of image data is stored as metadata and the metadata is analyzed and determined at the time of decoding.
[0060]
As described above, by changing the position of the important scene in each shot and the number of reproduction frames of the important scene adaptively, a high-speed reproduction search with good visibility becomes possible.
[0061]
Further, in the example described so far, the important scene of the shot is displayed without skipping when the important scene is reproduced. However, a method of reproducing the important scene of the shot by skipping the predetermined scene every predetermined frame may be used.
[0062]
FIG. 11 is a diagram showing a state of the high-speed search processing when the important scene 1111 is at the head of the shot 1110, and the important scene 1111 is reproduced by skipping every other frame. This is because displaying the important scenes of the shots without thinning improves the visibility, but has the problem that the playback speed becomes slower as the number of frames displaying the important scenes increases. The important scene 1111 portion of the shot 1110 is reproduced by skipping the frame to such an extent that the visibility is not degraded, so that both high-speed search and visibility can be achieved.
[0063]
Also, in the present embodiment, a video shot is described as an example of a unit for dividing video data, but a similar high-speed playback method is implemented for a larger video unit (combination of multiple video shots, video file, etc.). It is possible.
[0064]
Next, a case in which audio data is reproduced in addition to video during a high-speed search will be described.
[0065]
FIG. 12 is a diagram showing a state of a high-speed search process of audio data and video data in the present embodiment. In FIG. 12, a section indicated by 1201 indicates one shot, a section indicated by 1202 (gray) indicates a section for reproducing video data at the time of high-speed search, and 1203 indicates a section for skipping without reproducing video data. I have. A section (gray) indicated by 1204 is a section where audio data is reproduced during a high-speed search, and a section 1204 is a section where audio is skipped without being reproduced.
[0066]
In FIG. 12, as described above, high-speed search and reproduction of video data are performed with the leading portion of each shot as an important scene. At this time, the audio data continuously reproduces the audio data portion corresponding to the important scene at the head of each shot, and corresponds to the reproduction frame other than the important scene (in this case, the reproduction frame other than the head of each shot). Does not play audio data.
[0067]
In FIG. 12, the corresponding audio is played according to the time during which the important scene of the image is played. However, the audio is played back when it becomes difficult to hear because the audio playback time changes for each shot. Alternatively, a method of fixing the time to perform such as “2 seconds from the start of the shot” may be used.
[0068]
Also, as shown in FIG. 11, even when an important scene of a shot is skipped and reproduced, audio data is not skipped and a portion corresponding to the important scene of the shot is continuously reproduced for a predetermined time. However, in this case, control is performed so that the audio playback time does not exceed the image shot playback time. At this time, the reproduction speed of the audio data may be increased within a range in which a human can hear the audio data.
[0069]
Next, a video reproducing method at the time of the rewind search will be described with reference to FIG.
[0070]
In FIG. 13, 1300 represents the entire shot, 1301 represents image data in the shot, and 1302 represents audio data in the shot. A gray frame in 1301 indicates a frame reproduced during the high-speed rewind search, and a white frame indicates a frame to be skipped. In addition, the time axis indicates a later time as going to the right frame.
[0071]
When the speed of the rewind reproduction exceeds a predetermined speed and changes to the high-speed rewind reproduction mode, the reproduction frame of each shot is reproduced in the reverse order to the fast-forward reproduction described above. In the example of FIG. 13, the image data 1301 in the shot 1300 is reproduced in the order of the reproduction frame 1301a → the reproduction frame 1301b → the reproduction frame 1301c → the reproduction frame 1301d → the reproduction frame 1301e → the reproduction frame 1301f.
[0072]
On the other hand, in the audio data at the time of the rewind high-speed search, only the portion corresponding to the important scene of the image data for each shot is reproduced in the same direction as the normal reproduction.
In this case, since the reproduction directions of the audio data and the image data are reversed, only the important scene portion of the image data is reproduced by the same method as the fast-forward search (reproduction frame 1 → reproduction frame 2 → reproduction frame 6 → reproduction frame 5). Playback frame 4 → playback frame 3). Alternatively, control may be performed so that the audio is not reproduced during the rewind high-speed search. Thereby, even when audio data is reproduced during rewinding, the audio content is reproduced in the normal reproduction direction so that the content of the audio can be grasped, so that the content of the shot can be more easily grasped.
[0073]
As described above, in the above-described embodiment, when performing a high-speed search, a series of video data (moving image data) is divided into an important portion and other portions, and a predetermined number of frames are continuously arranged in the important portion. By performing reproduction while skipping other parts in accordance with the search speed, it is possible to increase the efficiency of high-speed search and improve the visibility.
[0074]
Further, by automatically setting the important part according to the type of the video data, it is possible to easily confirm the state of the important part corresponding to the video content and the entire video data.
[0075]
In the above-described embodiment, a case where a disk medium is used as a recording medium is described as an example. However, any medium that can randomly access data (for example, a flash memory) may be used. Absent.
[0076]
Further, the present invention can be applied to a system including a plurality of devices such as a host computer, an interface device, a reader, and a printer, and can be applied to a device including a single device (for example, a copying machine or a facsimile device, etc.). Device).
[0077]
Further, an object of the present invention is to provide a storage medium storing program codes of software for realizing the functions of the above-described embodiments to a system or an apparatus, and a computer (or CPU or MPU) of the system or apparatus to store the storage medium. It is also achieved by reading and executing the program code stored in the.
[0078]
In this case, the program code itself read from the storage medium realizes the function of the embodiment, and the storage medium storing the program code and the program code constitute the present invention.
[0079]
As a storage medium for supplying the program code, a ROM, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, or the like can be used.
[0080]
When the computer executes the readout program, not only the functions of the embodiment are realized, but also an OS (Operating System) running on the computer performs actual processing based on instructions of the program code. And a case where the functions of the embodiments are implemented by executing some or all of the functions.
[0081]
Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. This also includes a case where a CPU or the like provided in the board or the function expansion unit executes part or all of the actual processing, and the processing realizes the functions of the embodiments.
[0082]
【The invention's effect】
As described above, according to the present invention, the moving image data is divided into a plurality of periods at the time of high-speed search, and the thinning rate of the frame is changed between the periods to improve the search efficiency at high speed without complicated processing. And visibility can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a video playback frame according to an embodiment of the present invention.
FIG. 2 is a block diagram of a playback device according to the embodiment of the present invention.
FIG. 3 is a flowchart showing a process according to the embodiment of the present invention.
FIG. 4 is a diagram showing a video reproduction frame according to the embodiment of the present invention.
FIG. 5 is a diagram showing a video playback frame according to the embodiment of the present invention.
FIG. 6 is a diagram showing an output screen according to the embodiment of the present invention.
FIG. 7 is a diagram showing the number of frames for reproducing an important scene according to the embodiment of the present invention.
FIG. 8 is a diagram showing conventional 1 × speed reproduction.
FIG. 9 is a diagram showing conventional 1 × speed reproduction and shot length.
FIG. 10 is a diagram showing the number of frames for reproducing an important scene according to the embodiment of the present invention.
FIG. 11 is a diagram showing a video reproduction frame according to the embodiment of the present invention.
FIG. 12 is a diagram illustrating a relationship between a video playback frame and playback audio data according to the embodiment of the present invention.
FIG. 13 is a diagram showing the relationship between video playback frames and playback audio data during rewind playback according to the embodiment of the present invention.
FIG. 14 is a diagram showing a conventional example.

Claims (20)

Reproducing means for reproducing moving image data from a recording medium;
Control means for controlling the reproduction means to perform high-speed reproduction by thinning out and reproducing some frames of the moving image data in the high-speed search mode,
In the high-speed search mode, the control means divides the moving image data into a first period and a second period, and reduces a frame thinning rate in the first period to a frame thinning rate in the second period. A reproducing apparatus characterized in that the number is smaller than that of the reproducing apparatus. Reproducing means for reproducing moving image data from a recording medium;
Mode switching means for switching between a normal playback mode and a high-speed search mode in which high-speed playback is performed by thinning out and playing back some frames of the moving image data,
In the high-speed search mode, the moving image data is divided into a first period and a second period, and a frame thinning rate in the first period is made smaller than a frame thinning rate in the second period. A playback device comprising: a control unit that controls the playback unit. Reproducing means for reproducing moving image data from a recording medium;
Mode switching means for switching between a normal playback mode and a high-speed search mode;
In the high-speed search mode, the moving image data is divided into a first period and a second period, a plurality of frames are continuously reproduced in the first period, and a predetermined number of frames are reproduced in the second period. And control means for controlling the reproduction means so as to reproduce each frame. 4. The moving image data according to claim 1, wherein the moving image data includes a plurality of scenes each representing a series of moving images, and the control unit determines the first period for each scene. A playback device according to claim 1. 4. The reproducing apparatus according to claim 1, wherein the control unit specifies a portion selected from a plurality of predetermined periods in each scene as the first period. 5. 6. The reproducing apparatus according to claim 5, wherein the plurality of predetermined periods include a start period, a rear end period, and a center period of each scene. The control means determines the first period according to any one of a reproduction speed in the high-speed search mode, a length of each scene, a degree of correlation between frames in each scene, or a combination of these pieces of information. The playback device according to claim 5, characterized in that: 6. The reproducing apparatus according to claim 5, wherein the control unit increases the length of the first period as the reproduction speed during the high-speed reproduction increases. 6. The reproducing apparatus according to claim 5, wherein the control unit shortens the length of the first period as the length of the scene increases. 6. The reproducing apparatus according to claim 5, wherein the control unit shortens the length of the first period as the inter-frame correlation increases. 6. The reproducing apparatus according to claim 5, further comprising a designation unit for arbitrarily designating a first period in each scene. 6. The reproducing apparatus according to claim 5, further comprising display means for displaying a first period in the scene. 4. The reproducing apparatus according to claim 1, wherein the control unit determines the first period based on additional information reproduced together with the moving image data. 5. The control means controls the reproduction means to reproduce the video signal of the first period without thinning out frames, and to reproduce the video signal for every predetermined number of frames in the second period. The reproducing apparatus according to claim 1, wherein The reproducing unit reproduces audio data corresponding to the moving image data from the recording medium, and the control unit further reproduces only the audio data corresponding to the first period of the moving image data in the high-speed search mode. 13. The reproducing apparatus according to claim 1, wherein the reproducing unit controls the reproducing unit to stop reproducing the audio data corresponding to the second period. The control unit may further include, in a reverse search mode for performing high-speed playback in a direction opposite to the normal playback mode, thinning out some of the moving image data in a direction opposite to that in the normal playback mode. 15. The reproducing apparatus according to claim 14, wherein: A method for reproducing moving image data from a recording medium,
In a high-speed search mode in which high-speed reproduction is performed by thinning out and reproducing a part of frames of the moving image data, the moving image data is divided into a first period and a second period, and a frame in the first period is Wherein the thinning rate is smaller than the frame thinning rate in the second period. A method for reproducing moving image data from a recording medium,
A normal playback mode and a high-speed search mode for high-speed playback by thinning out and playing back some frames of the moving image data,
In the high-speed search mode, the moving image data is divided into a first period and a second period, and a frame thinning rate in the first period is smaller than a frame thinning rate in the second period. A reproduction method characterized by the following. A method for reproducing moving image data from a recording medium,
It has a normal playback mode and a high-speed search mode,
In the high-speed search mode, the moving image data is divided into a first period and a second period, a plurality of frames are continuously reproduced in the first period, and a predetermined number of frames are reproduced in the second period. A reproduction method characterized in that reproduction is performed for each frame. A storage medium storing a program for executing the method according to claim 17 using a computer.

Images