JP4642710B2 - Playback device - Google Patents

Description

  The present invention relates to a playback apparatus, and more particularly to an apparatus for generating a representative image of image data recorded on a recording medium.

  In recent years, a disk video camera that records and reproduces moving image data on a disk medium such as a DVD has appeared.

  When playing back a captured moving image in a disc video camera, a representative image of each scene of the moving image recorded on the disc is reproduced and displayed, and a user's desired scene is selected from these representative images. The configuration is common.

  When generating the representative image, for example, the moving image data recorded on the disc is reproduced and decoded, and one of the frames is selected as the representative image. Then, the size of the selected image data is reduced to a predetermined size suitable for display. The representative images of the scenes obtained in this way are displayed as a list on the same screen as an index screen.

  At this time, if the number of scenes recorded on the disc exceeds the number of screens that can be displayed on one screen, if the user of a scene other than the displayed representative image selects, the above-described processing for generating the representative image is performed again. To update the display screen.

  In this way, when displaying a list screen of representative images, it is necessary to sequentially reproduce the image data of each scene from the disc. Therefore, there is a problem that it takes time to display the list screen of representative images (thumbnail).

  In view of this, a configuration has been proposed in which the data of the representative image once displayed is held in the memory inside the apparatus and the list screen is displayed without reading from the disk when the same representative image is displayed again ( For example, see Patent Document 1).

In addition, a configuration is proposed in which a representative image is stored in a memory inside the apparatus before an instruction to switch the display of the thumbnail list screen, and the display screen is updated without reading out image data from the disk when switching the display. (For example, refer to Patent Document 2).
JP2005-253087 JP 2000-125239 A

However, in the conventional configuration described above, the number of representative image data that can be held in the memory inside the apparatus is limited. Therefore, when the number of representative images that can be held in the memory is larger than the number of scenes recorded on the disc, it is necessary to reproduce the image data from the disc in order to obtain a representative image that is not held.
As a result, it takes time to update the representative image list screen.

Since the user cannot determine whether an instruction to update the display screen has been accepted while the list screen is updated, the operability when selecting a desired playback scene has been significantly reduced.
The present invention aims to solve such problems.

  In addition, the present invention can display a representative image of an image recorded on a recording medium even when a memory with a limited capacity is used, and improve operability when selecting a desired image. Objective.

The present invention relates to a representative image that represents representative images of a plurality of scenes using reproduction means for reproducing image data of a plurality of scenes recorded on a recording medium, a memory, and image data reproduced by the reproduction means. Representative image generating means for generating data and storing it in the memory, display control means for generating a list screen of the representative images using the representative image data stored in the memory, and displaying it on a display device; and the recording Of the image data recorded on the medium, representative image data of consecutive predetermined scenes is generated and stored in the memory, and a part of the scenes other than the predetermined scene is selected. And control means for controlling the representative image generation means so as to generate representative image data of the selected scene and store it in the memory.

  A representative image of an image recorded on the recording medium can be displayed favorably.

  Embodiments of the present invention will be described below.

FIG. 1 is a diagram showing a configuration of a video camera 100 as an embodiment of the present invention.
The video camera 100 in FIG. 1 includes a control unit 111, and the control unit 111 controls each unit of the video camera 100 in accordance with instructions from the operation unit 112.

  First, the operation during shooting will be described. When the operation unit 112 is turned on, moving image data obtained by the imaging unit 101 is output to the display control unit 104 via the bus 115. The display control unit 104 displays a moving image related to the moving image data output from the imaging unit 101 on the monitor 105.

  In such a recording pause state, when a recording start instruction is issued by the operation unit 112, the moving image data output from the imaging unit 101 is sent to the CODEC memory 102 and temporarily stored. The moving image data stored in the CODEC memory 102 is read out in an order suitable for the encoding process in the CODEC 103. The CODEC 103 encodes the moving image data read from the CODEC memory 102 according to the MPEG system, and sends it to the stream buffer memory 106. The stream buffer memory 106 accumulates the encoded moving image data and multiplexes various control information output from the control unit 111 with the moving image data. Then, the disk I / F 107 reads data from the stream buffer memory 106 in response to the accumulation of a predetermined amount of data in the stream buffer memory 106 and records it on the disk 108.

  Thereafter, the same processing is continued until a recording stop instruction is issued. When there is an instruction to stop recording, data recording to the disk 108 is stopped.

  In this embodiment, a series of scene data recorded on the disk 108 from the recording start instruction to the recording stop instruction is managed as one file. In addition, the control unit 112 generates management information including the recording position information of each file and records the management information in a predetermined recording area on the disc 108 via the disc I / F 107. In this embodiment, a DVD-R disk or a DVD-RW disk is used as the disk 108, and data is recorded in accordance with the DVD video standard.

  Next, the operation during reproduction will be described.

  In the present embodiment, a list screen of representative images of each file (scene) recorded on the disk 108 is displayed, and a desired scene is selected from these representative screens.

  That is, the control unit 111 controls the disk I / F 107 at a predetermined timing such as when the power is turned on or when a new disk is mounted, and reproduces the image data recorded on the disk 108. Then, representative image data is generated and stored in the representative image memory 109. The representative image generation process will be described later.

  When the representative image data is accumulated in the representative image memory 109, the control unit 111 generates a first page representative list screen by the display control unit 104 and displays it on the monitor 105.

  The user operates the operation unit 112 to select a representative image of a desired scene from the representative images displayed on the monitor 105.

The control unit 111 controls the disc I / F 107 based on the management information recorded on the disc 108, and reproduces scene data corresponding to the representative image selected by the user from the disc 108.
The reproduced data is temporarily stored in the stream buffer memory 106.

  The encoded moving image data is sent to the CODEC 103, and the CODEC 103 decodes the reproduced moving image data and sends it to the frame memory 113. The moving image data stored in the frame memory 113 is read by the output unit 114, converted into a form applied to a display form such as an external monitor, and outputted.

  Further, the display control unit 104 displays a moving image related to the moving image data stored in the frame memory 113 on the monitor 105 instead of the representative list screen.

  Next, representative image data generation and storage processing in the present embodiment will be described.

  In the present embodiment, representative image data is obtained by decoding the first frame of the moving image data of each scene recorded on the disk 108 and further reducing it to a size determined by the resizing unit 110. In this embodiment, representative image data of a plurality of scenes is stored in the representative image memory 109 in advance.

  FIG. 2 is an image diagram when representative image data of all scenes recorded on the disk 108 can be stored in the representative image memory 109.

  In FIG. 2, each scene 201 recorded on the disk 108 is managed by a number, and a total of 64 scenes from # 1 to # 64 are recorded on the disk 108. In FIG. 2, scenes 1 to 64 are arranged in the order of shooting. The size of the representative image data is a predetermined size (here, 160 pixels × 120 pixels), and as shown by 202, the representative image memory 109 can hold representative image data of this size for 64 screens.

In this state, if representative image data is created for all scenes (64 scenes) recorded on the disk 108, the capacity of all representative image data = 160 × 120 × 64 is required. Yes, the relationship with the storable capacity of the representative image memory 109 = 160 × 120 × 64 capacity is
<Total capacity of representative image data> ≦ <Capacity that can be stored> (1)
Holds.

  When Expression (1) is established, the control unit 111 determines that the representative image data of all scenes recorded on the disc 108 can be stored in the representative image memory 109. Then, representative image data of all scenes is generated and stored in the representative image memory 109 in advance at an appropriate timing such as when a disc is mounted.

  On the other hand, FIG. 3 is an image diagram in a case where the representative image data of all scenes recorded on the disk 108 cannot be stored in the representative buffer memory 109.

  In FIG. 3, scenes recorded on the disk 108 are managed by numbers, and 128 scenes # 1 to # 128 are recorded on the disk 108 as indicated by 301. The size of the representative image data and the number of screens that can be held are the same as in the case of FIG.

Therefore, if representative image data is created for all scenes recorded on the disk 108, the capacity of the representative image data of all scenes = 160 × 120 × 128 is required. Storage capacity = 160 x 120 x 64
<Total capacity of representative image data >><Accumulablecapacity> (2)
It becomes.

  The control unit 111 determines that the representative image data of all the scenes recorded on the disc 108 cannot be stored in the representative image memory 109 when Expression (2) is satisfied.

Then, according to the following rule, representative image data of a specific scene is selected and stored in the representative buffer memory 109.
Condition 1: All scenes with respect to 2 / t before and after the currently selected (reproduced) scene (t is a predetermined number of 1 or more and 16 in the present embodiment, 2t in total (32 scenes)). Are stored in the representative image memory 109.
Condition 2: Remaining scenes other than Condition 1 are extracted at the number of remaining scenes (96 scenes in FIG. 3) / remaining capacity of representative image memory 109 (for 32 scenes) = 3 scenes (sheets), and representative image memory 109 is accumulated.

  The state of the representative image data accumulated by this rule is shown in FIG. In FIG. 3, reference numeral 302 represents representative image data accumulated under condition 1, and 303 represents representative image data accumulated according to condition 2.

  FIG. 4 is a flowchart showing a representative image data accumulation process by the control unit 111 in this embodiment.

  Hereinafter, the total number of scenes recorded on the disk 108 is N, the currently selected scene number is S, the number of representative image data that can be stored in the representative image memory 109 is T, and a scene for generating a representative image is determined. The counter is n, the threshold value of the counter n is M, and the thinning interval is W.

  In FIG. 4, first, the total number N of scenes recorded on the disk 108 is acquired (S401). Next, it is determined whether equation (1) holds (S402).

  That is, if the number T of images that can be stored is larger than the total number N of scenes on the disk 108, representative image data of all scenes is stored as shown in FIG. 2 (S403).

  On the other hand, when the total number N of scenes on the disk 108 is less than or equal to the number T that can be accumulated, as shown in FIG. 3, thinning accumulation processing for accumulating the representative image data of the scene selected according to the conditions 1 and 2 is executed ( S404).

  Next, the entire scene accumulation process of S403 will be described using the flowchart of FIG.

  In FIG. 5, first, the counter n is initialized with 1, the threshold M is initialized with N, and the thinning interval W is initialized with 1 (S501). Next, representative image data of scene number n is generated (S502). The generated representative image data is stored in the representative image memory 109 (S503), and W is added to the counter n (S504). Next, it is determined whether the counter n matches the threshold value M (S505). If No, the process returns to S501 to generate the next representative image. If Yes, the process ends.

Next, the thinning accumulation process will be described with reference to the flowchart of FIG.
First, the selected scene number S and the number t of scenes to be accumulated without thinning are acquired (S601). Then, the counter n is initialized with S− (t / 2), the threshold M is initialized with S + (t / 2), and the thinning interval W is initialized with 1 (S602). Next, a representative image of scene number n is generated (S603). The generated representative image data is stored in the representative image memory 109 (S604), and W is added to the counter n (S605). Then, it is determined whether the counter n matches the threshold value M (S605).

  If No, the process returns to S603 to generate the next representative image. If Yes, the counter n is initialized with S + (t / 2) +1, the threshold value M is S + (t / 2) + (N−t), and the thinning interval W is (N−t) / (T−t). Initialization is performed (S607).

  Next, representative image data of scene number n is generated (S608). The generated representative image data is stored in the representative image memory 109 (S609), and W is added to the counter n (S610). Then, it is determined whether the counter n matches the threshold value M (S611). If No, the process returns to S608 to generate the next representative image. If Yes, the process ends.

Thumbnail image data is generated and stored in this way. For example, in FIG. 3, the total number of scenes N recorded on the disk 108 is 128, the currently selected scene number S is 16, and representative images that can be stored. The number T is 64. Further, the counter n, the threshold value M, and the thinning interval W in S602 are respectively
Counter n ... 16- (32/2) + 1 = 1
Threshold M ... 16+ (32/2) = 32
Thinning interval W ... 1
It becomes.

In addition, the counter n, the threshold value M, and the thinning interval W in S607 are respectively
Counter n ... 16+ (32/2) + 1 = 33
Threshold M ... 16+ (32/2) + (128-64) = 96
Thinning interval W (128-32) / (64-32) = 3
It is.

  Each value is set to NU when the value U is 0 or less, and is set to ON when the value O is greater than N (the counter n is determined each time addition is performed).

  As described above, when the representative images of all scenes on the disk 108 can be accumulated, the process of FIG. 5 is performed, and when the representative images of all scenes cannot be accumulated, the process of FIG. 6 is performed.

  Thus, the representative image storage method is switched according to the capacity of the representative image data of all scenes and the capacity of the memory that can be stored.

  Further, in the process of FIG. 6, the thinning interval W is initialized to 1 in S602 and S607, respectively, and (N−t) / (T−t). Although the area is equally divided into the intervals (N−t) / (T−t), the ratio of the areas may be changed. That is, it is possible to configure the user to arbitrarily set the number of scenes t to be accumulated without thinning out representative images, and to change the area ratio according to the set number of t.

  Further, in the processing of FIG. 6, the representative image memory 109 is divided into two parts, ie, the area of the thinning interval 1 and the area of the thinning interval (N−t) / (T−t), but the number of divisions may be changed. That is, the thinning interval W may be set to three or more stages instead of two stages of 1 and (N−t) / (T−t).

  FIG. 7 is a diagram showing a state of a representative image list screen using the representative images accumulated by the processing of FIG.

  In this embodiment, six representative images are displayed on one screen (page) as shown at 701. The currently selected scene number is 16 (screen 1).

  In this state, when the user moves the cursor 705 to select the scene 10 and switches the display screen, all the representative images of the page including the scene 10 are accumulated as in 702. Therefore, there is no need to reproduce image data from the disc 108, and the list screen 702 is displayed quickly.

  When the user switches the display screen to select the scene 40 from the state 701, all the representative images (scenes 37 to 42) of the page including the scene 40 are not accumulated. However, since representative images have already been accumulated for some of the scenes, here, the scenes 39 and 42, a list screen including the representative images of the scenes 39 and 42 is first displayed as shown at 703. In parallel with this, the control unit 111 reproduces the data of the remaining scene from the disk 108, here the scenes 37, 38, 40, and 41 from the disk 108, and generates representative image data. The representative image data is stored in the representative image memory 109, and a representative image list screen 704 is displayed.

  At this time, in order to store the representative image data of the scenes 37, 38, 40, 41 in the representative image memory 109, it is necessary to overwrite any representative image data already stored in the representative image memory 109. .

  In the present embodiment, when the display of the list screen of the representative images is switched in this way, the flowcharts of FIGS. 4 to 6 are executed again to store the representative image data again.

  At this time, for scenes already stored in the representative image memory 109, only representative image data of scenes that need to be newly stored is generated without generating representative image data again.

  As described above, in this embodiment, when a representative image of each scene recorded on the disk 108 is generated in advance and stored in the memory, a specific scene is appropriately selected based on the total number of scenes on the disk and the memory capacity. The representative image data is accumulated by thinning out.

  At that time, by selecting the representative image closely for the scenes near the currently selected scene and sparsely selecting the other scenes, the display screen can be switched quickly when switching the display of the list screen. it can. Also, even when a scene that is relatively far from the currently selected scene is selected, a screen including a representative image of the scene in the vicinity is first displayed, so that it is easy to accept an instruction to update the display screen. Judgment can be made.

  In the video camera of FIG. 1, the CODEC memory 102, the stream buffer memory 106, the representative image memory 109, and the frame memory 113 are displayed as independent functional blocks. However, these memories may realize the same function by separately using storage areas of the same memory IC.

Next, a second embodiment will be described.
Also in the second embodiment, the configuration of the video camera is the same as in FIG. In the above-described embodiment, when the total number of scenes on the disk 108 is larger than the number of scenes that can be stored in the representative image memory 109, only a specific scene is selected and the representative image is stored.

  On the other hand, in the present embodiment, among the total scenes on the disk 108, a specific scene generates a representative image having a specified size A (160 × 120), and other scenes have representative images having a size smaller than the specified size. Generate.

  FIG. 8 is an image diagram when representative image data of all scenes recorded on the disk 108 can be stored in the representative image memory 109.

  In FIG. 8, each scene 201 recorded on the disk 108 is managed by a number, and a total of 64 scenes from # 1 to # 64 are recorded on the disk 108. The size of the representative image data is a prescribed size A: 160 pixels × 120 pixels. As shown in 802, the representative image memory 109 can hold the representative image data of size A for 64 screens.

In this state, when representative image data is created for all the scenes (64 scenes) recorded on the disk 108, the total capacity of the size A representative image data = 160 × 120 × 64 sheets. Necessary storage capacity of the representative image memory 109 = 160 × 120 × 64 capacity
<Total size of representative image data of size A> ≦ <Capacity that can be stored> (3)
Holds.

  When Expression (3) holds, the control unit 111 determines that the representative image data of all scenes recorded on the disc 108 can be stored in the representative image memory 109 with the size A. Then, representative image data of all scenes is generated and stored in the representative image memory 109 in advance at an appropriate timing such as when a disc is mounted.

  On the other hand, FIG. 9 is an image diagram when representative image data of all scenes recorded on the disk 108 cannot be stored in the representative buffer memory 109.

  In FIG. 9, the scenes recorded on the disk 108 are managed by numbers, and 160 scenes # 1 to # 160 are recorded on the disk 108 as indicated by 901. The size of the representative image data and the number of screens that can be held are the same as in the case of FIG.

Therefore, when representative image data is created for all scenes recorded on the disk 108, the total capacity of the representative image data of size A = 160 × 120 × 160 is required, and the representative image memory 109 Storable capacity = 160 × 120 × 64 capacity
<Total capacity of representative image data><Capacity that can be stored> (4)
It becomes.

  The control unit 111 determines that the representative image data of all the scenes recorded on the disc 108 cannot be stored in the representative image memory 109 when Expression (4) is satisfied.

Then, according to the following rules, representative image data is generated and stored in the representative image memory 109.
Condition 3: All scenes with respect to 2 / t before and after the currently selected (reproduced) scene (t is a predetermined number of 1 or more and 16 in the present embodiment, 2t (32 scenes) in total). The representative image data of size A is generated and stored in the representative image memory 109.
Condition 4: For the remaining scenes other than condition 1, the number of remaining scenes (128 scenes in FIG. 3) / remaining capacity of representative image memory 109 (32 scenes) = 4. Then, A / 4: 80 pixels × 60 pixels) is generated and stored in the representative image memory 109.

  The state of the representative image data accumulated by this rule is shown in FIG. In FIG. 9, 902 is representative image data stored under condition 1, and 903 is representative image data stored under condition 4.

  FIG. 10 is a flowchart showing representative image data accumulation processing by the control unit 111 in the present embodiment.

  Hereinafter, the total number of scenes recorded on the disk 108 is N, the currently selected scene number is S, the number of representative image data that can be stored in the representative image memory 109 is T, and a scene for generating a representative image is determined. Assume that the counter is n, the threshold value of the counter n is M, and the size of the representative image data is D.

  In FIG. 10, first, the total number of scenes N recorded on the disk 108 is acquired (S1001). Next, it is determined whether equation (3) holds (S1002).

  That is, if the capacity when the representative images of all the scenes on the disk 108 are generated with the size A is equal to or less than the storable capacity of the representative image memory 109, the representative image data of all the scenes is displayed with the size A as shown in FIG. Is generated and accumulated (S1003).

  On the other hand, when the capacity of the representative image data on the disk 108 exceeds the storable capacity of the representative image memory 109, a reduced accumulation process for generating and storing representative image data according to the conditions 3 and 4 is executed as shown in FIG. (S1004).

  Next, the entire scene accumulation process of S1003 will be described using the flowchart of FIG.

  In FIG. 11, first, the counter n is initialized with 1, the threshold M is initialized with N + 1, and the representative image size D is initialized with size A (S1101). Next, representative image data of scene number n is generated (S1102). The generated representative image data is stored in the representative image memory 109 (S1103), and 1 is added to the counter n (S1004). Next, it is determined whether the counter n matches the threshold value M (S1105). If No, the process returns to S501 to generate the next representative image. If Yes, the process ends.

  Next, the reduced accumulation process will be described with reference to the flowchart of FIG.

  First, the number t of scenes stored with the selected scene number S and the specified size A is acquired (S1201). Then, the counter n is initialized with S− (t / 2) +1, the threshold M is initialized with S + (t / 2) +1, and the representative image size D is initialized with size A (S1202). Next, a representative image of scene number n is generated (S1203). The generated representative image data is stored in the representative image memory 109 (S1204), and 1 is added to the counter n (S1205). Then, it is determined whether the counter n matches the threshold value M (S1205).

  If No, the process returns to S1203 to generate the next representative image. If Yes, the counter n is initialized with S + (t / 2) +1, the threshold M is S + (t / 2) + (N−t) +1, and the representative image size D is size A / ((N−t) / (T-t)) is initialized (S1207).

  Next, representative image data of scene number n is generated (S1208). The generated representative image data is stored in the representative image memory 109 (S1209), and 1 is added to the counter n (S1210). Then, it is determined whether the counter n matches the threshold value M (S1211). If No, the process returns to S1208 to generate the next representative image. If Yes, the process ends.

Thumbnail image data is generated and stored in this way. For example, in FIG. 9, the total number of scenes N recorded on the disk 108 is 160, the currently selected scene number S is 16, and representative images that can be stored. The number T is 64. In addition, the counter n, the threshold value M, and the size D in S1202 are respectively
Counter n ... 16- (32/2) + 1 = 1
Threshold M ... 16+ (32/2) = 33
Size D ... 160 x 120 (size A)
It becomes.

Further, the counter n, the threshold value M, and the size D in S1207 are respectively
Counter n ... 16+ (32/2) + 1 = 33
Threshold M ... 16+ (32/2) + (160-32) + 1 = 161
Size D ... A / (160-32) / (64-32) = 160 × 120/4
= 1/4 of size A
It is.

  Each value is set to NU when the value U is 0 or less, and is set to ON when the value O is greater than N (the counter n is determined each time addition is performed).

  As described above, when the representative images of all scenes on the disk 108 can be stored with the size A, the processing of FIG. 11 is performed, and when the storage is impossible, the processing of FIG.

  Thus, the representative image storage method is switched according to the capacity of the representative image data of all scenes and the capacity of the memory that can be stored.

  In the process of FIG. 12, the representative image memory 109 is equally divided into a representative image area of size A and a representative image area of size B, but the ratio of the areas may be changed.

  In the processing of FIG. 12, the representative image memory 109 is divided into two representative image areas of size A and size B, but other sizes C, D, etc. may be used.

  FIG. 13 is a diagram showing a state of a representative image list screen using representative images accumulated by the processing of FIG.

  In this embodiment, as shown in 1301, six representative images are displayed on one screen (page). The currently selected scene number is 16 (screen 1).

  When the user switches the display screen to select the scene 10 from this state, since the representative image of size A is stored in all pages including the scene 10 as in 702, the image data is reproduced from the disk 108 again. There is no need to do. Therefore, the list screen 1302 is quickly displayed.

  In addition, when the user moves the cursor 1305 and switches the display screen to select the scene 34 from the state 1301, the page including the scene 34 (scenes 31 to 36) stores a representative image of size B. ing. Therefore, as shown in 1303, the representative image data of size B of the page including the scene 34 is enlarged by the resizing unit 110 to generate a representative image of size A, and a list screen is first displayed. In parallel with this, the control unit 111 reproduces the data of the scenes 31 to 36 on this page from the disk 108 from the disk 108 and generates representative image data of size A. The representative image data is stored in the representative image memory 109, and a representative image list screen 1304 is displayed.

  At this time, in order to store the representative image data of the scenes 31 to 36 in the representative image memory 109, it is necessary to overwrite any representative image data already stored in the representative image memory 109.

  In the present embodiment, when the display of the list screen of the representative images is switched in this way, the flowcharts of FIGS. 10 to 12 are executed again to store the representative image data again.

  At this time, for scenes already stored in the representative image memory 109, only representative image data of scenes that need to be newly stored is generated without generating representative image data again.

  As described above, in this embodiment, when a representative image of each scene recorded on the disk 108 is generated in advance and stored in the memory, a specific scene is appropriately defined based on the total number of scenes on the disk and the memory capacity. The representative image data is accumulated with a size smaller than the size.

  At that time, a representative image of a specified size is generated for a scene in the vicinity of the currently selected scene, and a reduced size of the representative image data is generated for the other scenes. You can switch the display screen. Also, even when a scene that is relatively far from the currently selected scene is selected, the screen including the representative image is displayed first, although the resolution is low, so it is easy to accept the instruction to update the display screen. Judgment can be made.

It is a figure which shows the structure of the video camera in embodiment of this invention. It is a figure which shows the accumulation | storage state of a representative image. It is a figure which shows the accumulation | storage state of a representative image. It is a flowchart which shows the accumulation | storage process of representative image data. It is a flowchart which shows the accumulation | storage process of representative image data. It is a flowchart which shows the accumulation | storage process of representative image data. It is a figure which shows the list screen of a representative image. It is a figure which shows the accumulation | storage state of a representative image. It is a figure which shows the accumulation | storage state of a representative image. It is a flowchart which shows the accumulation | storage process of representative image data. It is a flowchart which shows the accumulation | storage process of representative image data. It is a flowchart which shows the accumulation | storage process of representative image data. It is a figure which shows the list screen of a representative image.

Claims (10)

Reproduction means for reproducing image data of a plurality of scenes recorded on a recording medium;
Memory,
Representative image generation means for generating representative image data indicating representative images of the plurality of scenes using the image data reproduced by the reproduction means, and storing the representative image data in the memory;
Display control means for generating a list screen of the representative images using the representative image data stored in the memory and displaying on the display device;
Of the image data recorded on the recording medium, representative image data of successive predetermined scenes are respectively generated and stored in the memory, and a part of the scenes other than the predetermined scene is stored. And a control means for controlling the representative image generating means so that representative image data of the selected scene is generated and stored in the memory.   Selection means for selecting a representative image of a scene to be reproduced from among a plurality of representative images displayed on the list screen, wherein the predetermined scene includes the scene of the representative image selected on the list screen and the selection The playback apparatus according to claim 1, wherein the playback apparatus is a scene continuous with the scene of the representative image being displayed.   When the selection means is instructed to switch the list screen, the control means uses the representative image data to be displayed on the list screen after switching among the representative image data stored in the memory, and the list after switching. 3. The playback apparatus according to claim 2, wherein the display control unit is controlled to generate and display a screen.   When there is the switching instruction, the control means is configured to select a scene other than the representative image data stored in the memory among predetermined scenes that are continuous with the representative image scene selected on the list screen after the switching. Controlling the reproduction means to reproduce the image data, and controlling the representative image generation means to generate representative image data using the reproduced image data and store the representative image data in the memory. The playback apparatus according to claim 3.   5. The playback apparatus according to claim 2, wherein the predetermined scene is a predetermined number of scenes continuous to the scene of the selected representative image. 6.   The image data is encoded, and includes decoding means for decoding the image data reproduced by the reproducing means, and the representative image generating means reduces the size of the image data decoded by the decoding means, thereby 6. The reproducing apparatus according to claim 1, wherein representative image data is generated. A control method of a playback apparatus for playing back image data of a plurality of scenes recorded on a recording medium,
Using the image data reproduced from the recording medium, generating representative image data indicating representative images of the plurality of scenes, and storing the representative image data in a memory;
Generating a list screen of the representative images using the representative image data stored in the memory, and displaying on a display device;
In the representative image generating step, representative image data of continuous predetermined scenes among the image data recorded on the recording medium are respectively generated and stored in the memory, and scenes other than the predetermined scene are stored. A control method, wherein a part of the scene is selected, representative image data of the selected scene is generated and stored in the memory. Reproduction means for reproducing image data of a plurality of scenes recorded on a recording medium;
Memory,
Representative image generation means for generating representative image data indicating representative images of the plurality of scenes using the image data reproduced by the reproduction means, and storing the representative image data in the memory;
Display control means for generating a list screen of the representative images using the representative image data stored in the memory and displaying on the display device;
Of the image data recorded on the recording medium, for consecutive predetermined scenes, representative image data of a predetermined size is generated and stored in the memory, and scenes other than the predetermined scene are stored. And a control means for controlling the representative image generating means so as to generate representative image data of a size smaller than the predetermined scene and store it in the memory.   Selection means for selecting a representative image of a scene to be reproduced from among a plurality of representative images displayed on the list screen, wherein the predetermined scene includes the scene of the representative image selected on the list screen and the selection The playback apparatus according to claim 8, wherein the playback apparatus is a scene continuous with the scene of the representative image being displayed.   The display control means switches and displays the list screen when there is an instruction to switch the list screen by the selection means, and the representative image data to be displayed on the list screen after switching is the small size, 10. The playback apparatus according to claim 9, wherein the size of representative image data to be displayed on the list screen after switching is enlarged to the predetermined size and then displayed.

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