DE10051637B4 - Apparatus for recording and / or reproducing moving images using a key frame and a method thereto - Google Patents

Abstract

Device for recording moving pictures with:
a recording medium on which coded motion picture data streams are recorded and a position of a representative picture is marked; and
recording means for marking a position of a representative image which is detected when there is a scene change between the coded motion picture data streams and recording the coded motion picture data streams on the recording medium,
wherein, when the coded motion picture data streams are coded based on MPEG coding standards, the recording means determines that there is a scene change when the periodic pattern of intra-picture areas of coded motion picture data streams is out of the periodic pattern for picture areas based on the MPEG coding standards and thereafter detects a position of the intra-picture area as a position of a representative picture appearing the first time.

Description

1st area the invention

The The present invention relates to an apparatus for recording and / or playing a moving picture or a moving picture using a keyframe and a method thereto, and more particularly relates to a device and methods of recording and / or playing a moving Image for using keyframes, with which the entire scenario of moving image content during a Trick play mode can be determined.

description of the prior art

In the Applicant known from practice moving image recording method become data streams moving pictures on the recording medium without change recorded, and in existing moving picture display methods the motion picture data streams recorded in this way are normal Speed or at a high speed according to one reproduced given playback speed factor. During one Normal speed playback mode, the reproduction is normal Speed running. While a high-speed playback mode becomes the reproduction at twice, four times or six times the normal speed executed.

conventional Motion picture playback methods are performed at a fixed speed executed selected from predetermined playback speed factors. The same problem can be found even in a high speed playback mode, about a trick play mode, opposite. In other words, in the Trick play mode will playback at a speed executed from twice, four times or six times the normal speed chosen becomes. Therefore, it is difficult to get just the keyframe, the one from the user desired representative Image corresponds to a conventional moving picture reproduction process to reproduce. Consequently, it is very difficult for one Users, from moving images, at a high speed play, such as in a trick play mode, a desired scene (e.g., the title of a movie) to accurately capture and reproduce.

Around to solve the problem described above, a method has been proposed in the while viewing moving pictures, a user directly includes any desired scene, which is to be played marked, with the marked scenes as keyframes while be used for playback. According to this procedure, the user must however, any desired Mark scene manually while he observes the moving image contents. Since marking is done manually, It's not easy, just the keyframes that make up the overall scenario represent real-time moving pictures, exactly to mark.

The JP8-214253 discloses a device in which a continuous Image stream predetermined images can be extracted. The Position information for this can be stored.

From the EP 0 841 665 A2 For example, a system and method for determining representative images of a video are known. When recording or playing a recorded video, an operator can mark certain pictures. The marked images can then be recognized with a scan mechanism and assembled into a visual table of contents.

The EP 0 607 010 A1 discloses an image data recording apparatus in which the correlation between two adjacent images is evaluated to determine if there is a scene change. A scene change saves a single image.

The EP 0 675 495 A2 discloses a method for detecting scene changes in compressed video sequences. A representative image can be used to visualize a video sequence.

OVERVIEW OF THE INVENTION

It is an object of the present invention, an apparatus and a method for recording moving pictures and a device to reproduce moving pictures, with which scene changes can be detected automatically.

These Task is solved by a device for recording moving pictures Claim 1, an apparatus for reproducing moving pictures according to claim 3 and a method for recording moving pictures Claim 5.

preferred embodiments are in the subclaims disclosed.

Preferably, the recording comprises a key frame acquisition and marking unit for detecting the position of a key frame corresponding to the representative image among the motion picture data streams and for marking its position; and a recording process for recording the moving picture data stream having the position of the representative image marked therein on the recording medium.

The Apparatus for reproducing moving images preferably comprises a key frame position search unit to search the position of the keyframe, that the representative Image corresponds to that recorded on the recording medium Moving picture data streams, and a reproduction processor for reading only the motion picture data stream, that corresponds to the keyframe, while all the unmarked images between keyframes based on the from the keyframe position unit skipped key frame positions and restore the uncoded original image data from the read data stream.

SHORT DESCRIPTION THE DRAWINGS

The The above objects and advantages of the present invention are achieved by the detailed description of a preferred embodiment with reference to the attached Drawings more clearly. Show it:

1 a functional block diagram illustrating an apparatus for recording and / or reproducing moving pictures using a key picture according to the present invention;

2 Fig. 10 is a process flowchart illustrating a moving picture recording method using a key picture according to the present invention; and

3 FIG. 5 is a process flow diagram illustrating a moving picture display method using a key picture according to the present invention.

DESCRIPTION THE PREFERRED EMBODIMENT

The The present invention will now be described in detail with reference to the accompanying drawings Drawings described.

According to 1 For example, a moving picture recording and / or reproducing apparatus according to the present invention comprises a key frame acquisition and marking unit 10 , a recording processor 12 , a recording medium 14 , a key frame position search unit 16 , and a playback processor 18 , The keyframe capture and marking unit 10 and the recording processor 12 correspond to a moving picture recording device. The key position search unit 16 and the playback processor 18 correspond to a moving picture display device.

The keyframe capture and marking unit 10 detects whether or not there is a scene change when coded moving picture data streams are input, based on the coding standards of the input moving picture data streams, and detects the position of a key picture corresponding to a representative picture when there is a scene change. Subsequently, the key frame capturing and marking unit marks 10 the position of the captured keyframe. The coded motion picture data streams are received from a predetermined television channel or supplied from an external system.

For example, when the input motion picture data streams are coded based on MPEG coding standards, the key frame acquiring and marking unit recognizes 10 in that there is a scene change when the periodic pattern of intra-picture areas of the input moving picture data streams is outside the normal periodic pattern of the intra-picture area compatible with the MPEG coding standards. After it is determined that there is a scene change, the intra-frame area that occurs for the first time is detected as a key frame corresponding to a representative frame. Further, the position of the detected intra-picture area is marked to signify that the captured intra-picture area is a key picture.

The recording processor 12 records the moving picture data stream with the representative picture position marked therein and the position of a scene representing a scene change on the recording medium 14 on. In this case, the position data of the key frame in a separate area of the recording medium 14 can be recorded, or these can be recorded along with the motion picture data streams.

The moving picture reproducing device that holds the key frame position searching unit 16 and the playback processor 18 includes searches for the position data of one on the recording medium 14 recorded representative image and reproduces only the representative image. In other words, the key frame position search unit 16 searches for the positional data of one in a separate area of the recording medium 14 or key picture recorded with the moving picture data stream.

In the case that the current playback mode is a trick play mode (or fast-forward mode) for estimating the entire scenario, the playback processor reads on the basis of the key frame position search unit 16 determined key frame position data only the moving picture data stream corresponding to the key picture, while the reproducing position of the recording medium 14 is skipped, and this converts the read data stream back into the uncoded original image data, which are then displayed on a screen.

Therefore can in a moving image recording and / or reproducing apparatus according to the present Invention a user in a pleasant way the overall scenario of Motion picture content playing at a high speed be, and he can use the high-speed playback mode switch to a normal play mode, if one by the user desired Scene appears. Because the detailed moving pictures of the desired Scene can be noted, satisfaction be improved by the user with the playback mode.

2 FIG. 10 is a process flow diagram of a method of recording moving images using a keyframe according to the present invention.

When the encoded motion picture data streams are supplied, as in FIG 1 shown in the step 21 determines if there is a scene change. In step 22 For example, the intra-picture area that has occurred for the first time after detecting a scene change is detected as the position of the key frame that corresponds to a representative picture. In step 23 the captured keyframe position is marked to indicate that this is the position of the representative image. In step 24 the moving picture data stream having the position of the key picture marked therein, which corresponds to the representative picture, is recorded on the recording medium 14 recorded.

3 Fig. 10 is a process flowchart of a moving picture recording method using a key picture according to the present invention.

If a trick play mode is set for estimating the overall scenario of moving picture contents, in step 31 in the recording medium 14 searched for the position of a keyframe that corresponds to a representative image. In step 32 the marked moving picture data streams are read out, while all unmarked pictures are keyed between key pictures on the basis 31 skipped key frame position data. In step 33 the read out moving picture data streams are again converted into the uncoded original picture data.

As previously described, according to the present invention, when coded motion picture data streams be recorded, a keyframe, that a scene change automatically recorded and its position recorded. During one Trick play mode will be based on the recorded key frame position searched and only the moving picture data stream, the keyframe corresponds, is reproduced at high speed, which the overall scenario of moving image content without the influence of a User can be easily determined.

There and estimating of the overall scenario is, a user can switch the playback mode to a normal playback mode, if a scene requested by the user when viewing the overall scenario, thereby accessing on the user's request Content between moving picture data streams is simplified.

1

1

coded Moving image data stream

2

Playback mode

3

display

10

Schlüsselbilderfassungs- and marking unit

12

record processor

14

recording medium

16

Keyframe position searcher

18

Display processor

2

21

To capture a scene change

22

To capture the position of a keyframe

23

To mark the position of the keyframe

24

Record a moving picture data stream with a key marked therein

selbildposition

END

THE END

3

31

Search according to the position of the keyframe

32

Taxes to deliver the playback position based on

arranged Data and readout of the data stream from recorded motion picture

countries

33

Restore the data stream of the moving picture

END

THE END

Claims (5)

Device for recording moving pictures With: a recording medium on which coded motion picture data streams are recorded and a position of a representative image are marked is; and a recording device for marking a position a representative Image captured when there is a scene change between the encoded ones Moving picture data streams and to record the encoded motion picture data streams on the Recording medium, wherein when the coded motion picture data streams are based on the Base encoded by MPEG encoding standards, the recording device determines that there is a scene change when the periodic pattern of intra-picture areas is based on coded motion picture data streams on the MPEG encoding standards outside of the periodic pattern for Image areas is and then a position of the intra-picture area as a position of a representative one Captured image that occurs the first time. The device for recording moving pictures according to claim 1, wherein the recording device comprises: a keyframe capture and marking unit for detecting a position of a key picture, that a representative Picture corresponds to the coded motion picture data streams as the position of a representative Picture and to mark its position; and a recording processor for recording the coded motion picture data stream on the recording medium, for the the position of the representative Picture was marked. Device for reproducing moving pictures With: a recording medium on which coded motion picture data streams and a Representative image position recorded, wherein the representative image position detected becomes when a scene change is marked is; and a playback device for searching for the Representative image position recorded on the recording medium and Playing a representative Image, wherein when the coded motion picture data streams are on the Base encoded by MPEG encoding standards, the representative Image position is the position of an intra-image area containing the first occurs after a scene change has been detected, where a scene change occurs when the periodic pattern of intra-picture areas of coded motion picture data streams based on the MPEG coding standards outside the periodic pattern for intra-image areas lies. The device for reproducing moving pictures according to claim 3, wherein the playback device comprises: a Keyframe position searcher to search for the position of the representative image key image among the moving picture data streams recorded on the recording medium; and one Playback processor for reading only the keyframe corresponding motion picture data stream, while all unmarked pictures between keyframes based on the from the key frame position search unit skipped key frame position data and restore the uncoded original image data from the read data stream. Method for recording moving pictures with the steps: (a) Detect if there is a scene change based on the coding standards when coded motion picture data streams are supplied; (B) Capture the position of an image that is occurring for the first time after the scene change is detected as a representative image position, if in step (a) a scene change is recorded; (c) marking the representative image position acquired in step (b); and (d) recording the coded motion picture data stream with the selected representative image position, wherein, when the coded motion picture data streams based on MPEG Coding standards are coded, capturing whether there is a scene change There is a scene change then detected when the periodic pattern of intra-image areas of coded motion picture data streams outside of the normal periodic pattern for intra-image areas is based on the MPEG encoding standards, the image area containing the first time after a scene change has been detected Intra-image area is.