WO2010109133A1 - Procede et dispositif de stockage d'une partie d'un flux video. - Google Patents
Procede et dispositif de stockage d'une partie d'un flux video. Download PDFInfo
- Publication number
- WO2010109133A1 WO2010109133A1 PCT/FR2010/050529 FR2010050529W WO2010109133A1 WO 2010109133 A1 WO2010109133 A1 WO 2010109133A1 FR 2010050529 W FR2010050529 W FR 2010050529W WO 2010109133 A1 WO2010109133 A1 WO 2010109133A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- compressed
- video stream
- keyframe
- frames
- image
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
- G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
- G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/103—Selection of coding mode or of prediction mode
- H04N19/107—Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/172—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a picture, frame or field
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
- H04N19/426—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements using memory downsizing methods
- H04N19/428—Recompression, e.g. by spatial or temporal decimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
- H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
Definitions
- the present invention relates to a method and a device for storing part of a compressed video stream and a computer program product for implementing the method.
- the most widely used compression coding is that defined by the MPEG working group, more particularly in the ISO / IEC 13818-MPEG-2 and ISO / IEC 14496-MPEG standards. 4. These two standards are very similar in the compression principles used: some images are stored and compressed at regular intervals, and for intermediate images, only the differences are stored and encoded.
- MPEG compression uses motion estimation.
- MPEG encoding decomposes each block image called macro block, and examines for neighboring images whether there are similar blocks. If a match is found, rather than storing the entire block, the system stores a much smaller vector describing how the block moved (or did not move) between the frames. Vectors are encoded so that they can use only a single bit in some cases so that backgrounds and other elements that do not move over time are compressed very efficiently. Likewise, large groups of blocks that move together, such as a large object or scrolling the entire image, are also compressed efficiently.
- MPEG uses three types of image coding methods.
- Intra frames or I frames, in which an entire image is compressed and stored with Discrete Cosine Transform (discrete cosine transform) quantification. This creates a reference image from which the following images are constructed. These I frames also allow random access in the video stream, and in practice are generated approximately every half-second.
- the predicted frames, or P frames contain motion vectors describing the difference from the nearest I frame or P frame.
- Frames of the third type are bidirectional frames or B frames. The system looks forward or backward to find matching blocks. In this way, if something new appears in a B frame, it can be mapped to a block of the next I or P frames. It is therefore understandable that, statistically, the P and B frames are much smaller than the frames. I. frames
- a compressed video stream can only start on an I frame serving as the first reference image from which the following P or B frames will be constructed. As indicated above, these I frames are also used for random access to the video stream. However, it is understood that, when it is desired to record, or store, only part of the video stream, with a random start, so not necessarily corresponding to a frame I, there is a problem.
- the current recording systems decode the compressed video stream in the water so that when the user of the system decides the beginning of a recording, the decompressed image corresponding to this beginning of The recording is coded again as an I frame. Then the following frames are recoded from this frame I or, if the coding permits, the following B or P frames are kept but as differential images of the picture. I rebuilt.
- the system detects in addition the first frame I of the incoming compressed video stream following the start of the recording and, from this frame, stores without transformation the incoming compressed video stream.
- a method of storing a portion of a compressed video stream, said compressed video stream comprising a succession of compressed keyframes between which are interposed intermediate frames comprising at least the coding of the differences between an uncompressed intermediate image and the immediately preceding compressed key image comprises: the acquisition in real time of the compressed video stream,
- the temporary storage without decompression, of the acquired compressed video stream, said temporary storage comprising at least the last received compressed keyframe and the following intermediate frames,
- a compressed keyframe is reconstructed from the last received compressed keyframe and subsequent intermediate frames, and then the last received compressed keyframe is replaced in the temporary storage by the reconstructed compressed keyframe.
- the compressed video stream is a video stream encoded according to ISO / IEC 13818-MPEG-2, ISO / IEC 14496-MPEG-4 and H264.
- a computer program product includes program code instructions recorded on a computer readable medium, for implementing the steps of the above method when said program is running on a computer.
- a device for storing a portion of a compressed video stream, said compressed video stream comprising a succession of compressed keyframes between which are interposed intermediate frames comprising at least the difference coding between an uncompressed intermediate image and the immediately preceding key image comprises:
- Means for receiving a permanent storage start event at a given moment connected to triggering means: means for storing the part of the video stream starting from the given instant, characterized in that it furthermore
- said temporary storage means comprising at least the last received compressed keyframe and the following intermediate frames
- FIG. 1 is a diagrammatic view of an example of a storage method of video stream according to the prior art
- FIG. 2 is a schematic view of an exemplary storage method according to one embodiment of the invention
- FIG. 3 is a flow chart of a storage method according to one embodiment of the invention.
- FIG. 4 is a schematic view of a storage device according to one embodiment of the invention.
- FIG. 1 represents a video stream in the MPEG format comprising two compressed images I (in other words two I frames) referenced 1 and 2 along an axis of the times AA.
- the compressed image I 1 is thus prior to the compressed image I 2.
- Between these compressed images I are interposed frames P 11,
- the corresponding decoded stream is symbolized on the axis BB, in the form of a stream of decoded images F 31 to 39.
- the decoded image F 31 is obtained by decompressing the compressed image I 1 and the decoded image F 35 is obtained by decompressing the compressed image I 2.
- the image F 32 is obtained by modifying the image F 31 as a function of the motion vectors contained in the frame P 11, modification symbolized by the sign + in FIG. 1.
- the image F 33 is obtained by modifying the image F 32 as a function of the motion vectors contained in FIG. the frame P 12 and so on for the decoded images corresponding to the P frames of the encoded video stream.
- FIG. 2 represents on its upper part the same encoded video stream as that of FIG. 1 with the same references.
- a registration request D is initiated by a user.
- the registration request D intervenes temporally between the frames P 23 and 24.
- the lower part of FIG. 2 represents the contents of a temporary storage area S.
- the frames are stored in the course of the water and the temporary storage S is reset with each arrival of compressed images I.
- the storage contains the compressed image I 1, then the frames I 1 and P 11, then the frames I 1, P 11 and P 12 then the frames I 1, P 11, P 12 and P 13.
- the temporary storage S is emptied and only the compressed image I 2 remains stored, and so on.
- the temporary storage S thus contains the compressed image I 2 and the frames P 21, P 22 and P 23.
- the frame P 24 which contains the differences between the images F 38 and F 39 thus also contains the motion vectors making it possible to decode the image F 39 from the image I 40.
- the storage method consists, as illustrated in FIG. 3, in acquiring (step 50) in real time the compressed video stream and in
- step 52 storing it (step 52) temporarily, without decompression so that the storage comprises at least the last compressed image I, or key image, acquired and the following intermediate frames, of type P and B.
- a recording start event that is, permanent storage
- step 56 a keyframe is reconstructed (step 56) from the last keyframes and received intermediate frames to obtain a keyframe corresponding to the recording start time
- step 58 the video stream is stored (step 58) without modification, that is to say without decoding-coding operation.
- reception means 62 for receiving a permanent storage start event at a given moment, connected to triggering means 64, such as for example a push button enabling a user to indicate a permanent storage start event by a simple pressure; and storage means 66 of the video stream portion starting from the given instant.
- This dedicated machine also comprises: temporary storage means 68, without decompression, of the acquired video stream adapted to store at least the last received keyframe and the following intermediate frames; and
- the temporary storage means 68 are composed of random access memories of the RAM type, or FIFO type of access memory in order to allow quick access to the stored data
- the storage means 66 are composed of hard disks. , magnetic tapes or optical discs with high permanent storage capacity.
- the reconstruction means are achievable through a combination of a microprocessor and software. However, the speed constraints may also encourage the skilled person to use a software programmed signal processing processor or a logic circuit in which the functionalities will be implemented in the form of a logic gate network.
- the software is in the form of a computer program product having program code instructions recorded on a computer readable medium, for implementing the steps of the described storage method.
- An implementation variant of this method consists, in the context of a compromise between the size of the temporary storage and the calculation means used, of reconstructing a key image from the images contained in the temporary storage as soon as the temporary storage of images go beyond a predetermined storage size, then keeping only this key image reconstructed in the temporary storage as well as the following intermediate images. It is understood that this operation reduces the size of the temporary storage at the expense of an additional reconstruction operation.
- the encoding of the following immediately following frames may require to be recoded so that they comprise the differences with the reconstructed image I.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Television Signal Processing For Recording (AREA)
- Closed-Circuit Television Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2756413A CA2756413A1 (fr) | 2009-03-24 | 2010-03-23 | Procede et dispositif de stockage d'une partie d'un flux video |
EP10715970A EP2412164A1 (fr) | 2009-03-24 | 2010-03-23 | Procede et dispositif de stockage d'une partie d'un flux video. |
JP2012501354A JP2012521703A (ja) | 2009-03-24 | 2010-03-23 | ビデオストリームの一部を記憶するための方法および装置 |
CN2010800236137A CN102450013A (zh) | 2009-03-24 | 2010-03-23 | 视频流部分的存储方法和装置 |
US13/260,013 US20120014675A1 (en) | 2009-03-24 | 2011-03-23 | Method and Device for Storing a Portion of a Video Stream |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0951897 | 2009-03-24 | ||
FR0951897A FR2943877B1 (fr) | 2009-03-24 | 2009-03-24 | Procede et dispositif de stockage d'une partie d'un flux video |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010109133A1 true WO2010109133A1 (fr) | 2010-09-30 |
Family
ID=41464874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2010/050529 WO2010109133A1 (fr) | 2009-03-24 | 2010-03-23 | Procede et dispositif de stockage d'une partie d'un flux video. |
Country Status (7)
Country | Link |
---|---|
US (1) | US20120014675A1 (fr) |
EP (1) | EP2412164A1 (fr) |
JP (1) | JP2012521703A (fr) |
CN (1) | CN102450013A (fr) |
CA (1) | CA2756413A1 (fr) |
FR (1) | FR2943877B1 (fr) |
WO (1) | WO2010109133A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9813732B2 (en) | 2012-06-28 | 2017-11-07 | Axis Ab | System and method for encoding video content using virtual intra-frames |
US9940362B2 (en) | 2015-05-26 | 2018-04-10 | Google Llc | Predicting user needs for a particular context |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0695088A2 (fr) * | 1994-07-29 | 1996-01-31 | Sharp Kabushiki Kaisha | Dispositif de communication vidéo du type à emmagasinage |
US6240210B1 (en) * | 1996-12-24 | 2001-05-29 | Kabushiki Kaisha Toshiba | Image decompression system capable of reducing memory capacity |
US6240136B1 (en) * | 1998-02-19 | 2001-05-29 | Alcatel | Method of providing an access point into a video data stream and apparatus for carrying out the method |
WO2001067775A2 (fr) * | 2000-03-06 | 2001-09-13 | Kabushiki Kaisha Toshiba | Appareil d'enregistrement de donnees codees et terminal mobile |
WO2003007603A1 (fr) * | 2001-07-12 | 2003-01-23 | Thomson Licensing S.A. | Modification de signaux video par conversion en images non intra |
US20040141722A1 (en) * | 2002-11-08 | 2004-07-22 | Nec Corporation | Apparatus and method for video edition |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4421055B2 (ja) * | 2000-03-06 | 2010-02-24 | 株式会社東芝 | データ伝送システムとその通信装置 |
JP4283964B2 (ja) * | 2000-03-06 | 2009-06-24 | 株式会社東芝 | 符号化データ記録装置 |
CN101401423A (zh) * | 2006-03-27 | 2009-04-01 | 日本电气株式会社 | 运动图像存储系统、运动图像存储方法和运动图像存储程序 |
-
2009
- 2009-03-24 FR FR0951897A patent/FR2943877B1/fr active Active
-
2010
- 2010-03-23 EP EP10715970A patent/EP2412164A1/fr not_active Withdrawn
- 2010-03-23 CA CA2756413A patent/CA2756413A1/fr not_active Abandoned
- 2010-03-23 JP JP2012501354A patent/JP2012521703A/ja active Pending
- 2010-03-23 WO PCT/FR2010/050529 patent/WO2010109133A1/fr active Application Filing
- 2010-03-23 CN CN2010800236137A patent/CN102450013A/zh active Pending
-
2011
- 2011-03-23 US US13/260,013 patent/US20120014675A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0695088A2 (fr) * | 1994-07-29 | 1996-01-31 | Sharp Kabushiki Kaisha | Dispositif de communication vidéo du type à emmagasinage |
US6240210B1 (en) * | 1996-12-24 | 2001-05-29 | Kabushiki Kaisha Toshiba | Image decompression system capable of reducing memory capacity |
US6240136B1 (en) * | 1998-02-19 | 2001-05-29 | Alcatel | Method of providing an access point into a video data stream and apparatus for carrying out the method |
WO2001067775A2 (fr) * | 2000-03-06 | 2001-09-13 | Kabushiki Kaisha Toshiba | Appareil d'enregistrement de donnees codees et terminal mobile |
WO2003007603A1 (fr) * | 2001-07-12 | 2003-01-23 | Thomson Licensing S.A. | Modification de signaux video par conversion en images non intra |
US20040141722A1 (en) * | 2002-11-08 | 2004-07-22 | Nec Corporation | Apparatus and method for video edition |
Non-Patent Citations (1)
Title |
---|
OZAWA K ET AL: "Low complexity real-time video transcoders for mobile video applications", IEEE INTERNATIONAL SYMPOSIUM ON A WORLD OF WIRELESS, MOBILE AND MULTIMEDIA NETWORKS, 23 June 2008 (2008-06-23), pages 1 - 6, XP031302841, ISBN: 978-1-4244-2099-5 * |
Also Published As
Publication number | Publication date |
---|---|
CN102450013A (zh) | 2012-05-09 |
FR2943877A1 (fr) | 2010-10-01 |
FR2943877B1 (fr) | 2014-04-04 |
JP2012521703A (ja) | 2012-09-13 |
CA2756413A1 (fr) | 2010-09-30 |
US20120014675A1 (en) | 2012-01-19 |
EP2412164A1 (fr) | 2012-02-01 |
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