WO2001063920A1 - Procede et appareil de lecture video - Google Patents
Procede et appareil de lecture video Download PDFInfo
- Publication number
- WO2001063920A1 WO2001063920A1 PCT/JP2001/000101 JP0100101W WO0163920A1 WO 2001063920 A1 WO2001063920 A1 WO 2001063920A1 JP 0100101 W JP0100101 W JP 0100101W WO 0163920 A1 WO0163920 A1 WO 0163920A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- speed
- image
- playback
- motion
- reproduction
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/78—Television signal recording using magnetic recording
- H04N5/782—Television signal recording using magnetic recording on tape
- H04N5/783—Adaptations for reproducing at a rate different from the recording rate
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/1808—Driving of both record carrier and head
- G11B15/1875—Driving of both record carrier and head adaptations for special effects or editing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/46—Controlling, regulating, or indicating speed
- G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven
- G11B15/4673—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven by controlling the speed of the tape while the head is rotating
-
- 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 an image reproducing apparatus and an image reproducing method, and more particularly, to a configuration and a method for adjusting a reproduction speed in a special reproduction mode.
- An object of the present invention is to provide an image reproducing apparatus and an image reproducing method capable of adjusting a reproducing speed in accordance with the movement of an image in a special reproduction mode.
- An image reproducing apparatus includes: a specification unit for specifying a special reproduction mode for reproducing an image at a reproduction speed different from a normal reproduction speed; A speed control means for adjusting the reproduction speed in the designated special reproduction mode.
- the speed control means includes means for obtaining a motion amount in a specific area of the image.
- the speed control means further includes means for comparing the amount of movement with the threshold value and adjusting the reproduction speed based on the result of the comparison.
- the speed control means compares the memory for storing the motion amounts of the plurality of frames with the total value of the motion amounts of the plurality of frames read from the memory and the threshold value, and adjusts the reproduction speed based on the comparison result.
- the image reproducing device includes a means for reproducing and displaying an image based on speed control by the speed control means.
- the speed control unit increases the playback speed for a scene with a small motion relative to a predetermined reference playback speed, and decreases the playback speed for a scene with a large motion relative to the reference playback speed .
- an image reproducing method in a special reproduction mode for reproducing an image at a reproduction speed different from a normal reproduction speed, increasing a reproduction speed for a scene having a small motion relative to a predetermined reference reproduction speed, A speed control step for lowering the reproduction speed is provided for a scene with a large movement relative to the reference reproduction speed.
- the speed control step includes a movement amount detection step of obtaining a movement amount in a specific area of the image.
- the speed control step further includes a step of comparing the amount of motion with a threshold value and adjusting the reproduction speed based on the result of the comparison.
- the method further includes a step of reproducing and displaying an image based on the speed control in the speed control step.
- the reproduction speed can be adjusted according to the amount of motion in the scene. Therefore, even during high-speed playback, the playback speed can be reduced for scenes with large motion. This makes it possible to track even a scene with large motion.
- the playback speed can be increased for scenes with little motion. Therefore, even at low-speed playback, Without spending time, you can take time to view only the scenes with the most motion.
- FIG. 1 is a diagram showing an example of a configuration of an image reproducing device 100 according to an embodiment of the present invention.
- FIG. 2 is a flowchart for explaining the adjustment processing of the reproduction speed in the image reproduction apparatus 1000.
- FIG. 3 is a conceptual diagram showing the configuration of the memory 504.
- FIG. 4 is a diagram showing an example of another configuration of the image reproducing device according to the embodiment of the present invention.
- the image reproducing apparatus 1000 can successively adjust the special reproduction speed according to the amount of motion (change amount) of an image.
- an image reproducing apparatus 100 includes a decoder 100 for decoding MPEG video, and a display circuit 300 for displaying video.
- the special playback specification section 400 for specifying that the normal playback mode also performs high-speed and / or low-speed playback display (special playback mode), and control for adjusting the playback speed in the special playback mode Unit 500.
- the decoder 100 is compressed according to the MPEG standard, which is an international standard for video compression.
- the compressed video data is received at the input.
- a data sequence of video data (MPEG video stream) is composed of n GOPs (G ⁇ P 0 to GOPn ⁇ 1), and each GOP includes a plurality of pictures.
- Bi-directional prediction by the decoder 100 based on the I picture generated by the intra-frame encoding process, the P-picture generated by the forward prediction based on the inter-frame encoding process, and the inter-frame encoding process
- the B picture generated by is decoded.
- the decoder 100 includes a VLD circuit (Variable Length Decoder) 101, an IQ circuit (Inverse Quantizer) 102, an IDCT circuit (Inverse Discrete Cosine Transform) 103 , An MC circuit (Motion Compensated Prediction: motion compensation circuit) 104, and a frame buffer 105 for storing reproduced image data.
- VLD circuit Very Length Decoder
- IQ circuit Inverse Quantizer
- IDCT circuit Inverse Discrete Cosine Transform
- An MC circuit Motion Compensated Prediction: motion compensation circuit
- frame buffer 105 for storing reproduced image data.
- the VLD circuit 101 decodes variable-length encoded data (MPEG video).
- the control unit 500 which will be described later, sends, from the VLD circuit 101, macro block address information (MB address information) indicating the position of a macro block, which is a unit of decoding, and the positions of reference image data and the macro block to be added to the macro block.
- MB address information macro block address information
- Receive motion vector information indicating the relationship.
- the IQ circuit 102 inversely quantizes the transform coefficients (quantized DCT coefficients) output from the VLD circuit 101 and converts them into DCT coefficients.
- the IDCT circuit 103 performs an inverse discrete cosine transform process on the DCT coefficients generated by the IQ circuit 102, and generates prediction error data in macroblock units or I-picture reproduced image data.
- the MC circuit 104 reads, from the frame buffer 105, reference image data specified by the motion vector information output from the VLD circuit 101, and compares the reference image data with the prediction error data output from the IDCT circuit 103. Perform motion compensation processing to add. Playback image data corresponding to the P picture and the B picture is output by the motion compensation processing.
- the reproduced image data is stored in the frame buffer 105.
- the stored playback image data corresponding to I-pictures and P-pictures is used as reference image data in motion compensation processing.
- the display circuit 300 receives the reproduced image data stored in the frame buffer 105. And convert it to a video signal suitable for the display screen. As a result, the video is displayed on the screen. In normal playback mode (when no special playback mode is specified), the video is displayed at a constant speed (normal playback speed).
- the user specifies a special reproduction mode for reproducing at a speed different from the normal reproduction speed by using the special reproduction specifying section 400.
- the special playback specified by the user includes forward high-speed playback, forward low-speed playback, reverse high-speed playback, and reverse low-speed playback. If you specify forward high-speed playback, video is played back at high speed along the time series. If you specify forward slow playback, video is played back at low speed along the time series. Also, if you specify reverse high-speed playback, the video is played back at a high speed in chronological order. If you specify reverse low-speed playback, the video is played back at a low speed in chronological order.
- the special reproduction specifying section 400 outputs the reference reproduction speed Vr according to the mode specified by the user. For example, when 3 ⁇ speed forward high-speed playback is designated, the special playback designation unit 400 outputs a reference playback speed Vr for playing back and displaying a video at 3 ⁇ speed.
- the control unit 500 performs a process for adjusting the reference playback speed Vr according to the scene in the special playback mode.
- the control unit 500 includes an area determination unit 501, a switch unit 502, a motion amount determination unit 503, and a reproduction speed determination unit 505.
- the area determination 155001 determines whether or not to use the corresponding motion vector information as a criterion for adjusting the reproduction speed based on the MB address information received from the VLD circuit 101 described above.
- An example of the determination method is based on whether or not the corresponding macroblock is included in a specific region of the image (for example, the center of the image).
- the switch unit 502 transmits the motion vector information received from the VLD circuit 101 described above to the motion amount determination unit 503 according to the determination result of the area determination unit 501.
- the corresponding motion address is used as a criterion in the motion amount determination unit 503.
- the motion amount determination unit 503 calculates the sum ⁇ ⁇ IM v I (motion amount ⁇ I ⁇ ⁇ I) of the absolute value of the motion vector transmitted from the switch unit 502, and based on the motion amount, It is determined whether the scene has a large motion or a small motion.
- Ma with multiple motion vectors For cross-blocks, use the motion vector with the largest absolute value among multiple motion vectors.
- the specific area serving as a criterion in the area determination unit 501 can be specified (changed).
- all the motion vector information is transmitted to the motion amount determination unit 503.
- the playback speed determination unit 505 determines a playback speed V that is appropriate for the reference playback speed Vr based on the determination result of the motion amount determination unit 503.
- the playback speed determination unit 505 adjusts the reference playback speed Vr, and sets the playback speed V according to the movement of the scene. As a result, the adjustment of the reproduction speed in frame units is realized.
- the reproduction speed adjustment is not limited to this, and may be performed based on the amount of motion in a plurality of frames.
- a memory 504 for storing the output (movement determination or motion amount) of the motion amount determination unit 503 for several frames is arranged.
- the playback speed determination unit 505 sets the playback speed V based on the motion amount of the current frame to be processed and the motion amount in the past frame.
- FIG. 1 An example of the reproduction speed adjustment processing using the memory 504 will be described with reference to FIG. It is assumed that the memory 504 is composed of areas M (0) to M (9) as shown in FIG.
- the symbol i in the area M (i) indicates a relative address in the memory space.
- step SI storage areas M (0) to M (9) of memory 504 and address A specifying the storage area are initialized (step SI).
- A 0.
- the motion amount ⁇ IMVI which is the sum of the absolute values of the motion vectors in the specified specific area, is calculated (step S2). At this time, as described above, one absolute value of the motion vector is added for each macroblock. Therefore, for a macroblock with multiple motion vectors, the motion vector with the largest absolute value is used. Record the amount of motion ⁇ I Mv I in the area M (A) at address A (step S2).
- the total value ALL is compared with preset threshold values T 1 and T 2 (T 1> T 2).
- the reference playback speed Vr is adjusted based on the comparison result (step S5). This Determines the playback speed V.
- the address A is updated by adding 1 to the address A (step S6). However, if A> 9, reset A to 0. Then, at the playback timing of the next picture, the process proceeds to step S2.
- the control section 500 further includes a variable speed reproduction control section 506.
- the variable speed reproduction control unit 506 outputs a control signal (Skip / Repeat) for realizing the reproduction speed V output from the reproduction speed determination unit 505.
- the signal Skip is a control signal for reproducing and displaying an image at a higher speed than the current speed
- the signal Repeat is a control signal for reproducing and displaying an image at a lower speed than the current speed.
- the transfer control unit 200 thins out B pictures from data supplied to the decoder 100 according to the control signal SkiP. Then, the reproduction display is performed only by the I picture and the P picture.
- the display circuit 300 thins out (skips) and displays the reproduced image data for each predetermined frame in accordance with the control signal S kip.
- the display circuit 300 When the control signal Repeat is output, the display circuit 300 repeatedly displays the same reproduced image data a predetermined number of times for each predetermined frame in accordance with the control signal Repeat.
- the same reproduced image data is repeatedly displayed a predetermined number of times for each predetermined frame.
- reproduction control method based on the control signal Skip.Repeat is not limited to the above-described method.
- a decoder corresponding to the compression method is arranged in place of the decoder 100, and the control unit detects motion of each frame. Give to 50 ⁇ .
- a motion detection circuit 600 detects a motion amount for each frame, and the detection result is supplied to a motion amount determination unit 503. I do. Then, the display circuit 700 causes the display circuit 700 to execute the reproduction display at the reproduction speed V based on the control signals Skip and Repeat output from the variable speed reproduction control unit 506.
- the playback speed is increased for a scene with little motion relative to the reference playback speed, and the scene with large motion relative to the reference playback speed is increased.
- the playback speed can be reduced.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Television Signal Processing For Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001225494A AU2001225494A1 (en) | 2000-02-23 | 2001-01-11 | Method and apparatus for video playback |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-45470 | 2000-02-23 | ||
JP2000045470A JP2001238182A (ja) | 2000-02-23 | 2000-02-23 | 画像再生装置および画像再生方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001063920A1 true WO2001063920A1 (fr) | 2001-08-30 |
Family
ID=18568046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/000101 WO2001063920A1 (fr) | 2000-02-23 | 2001-01-11 | Procede et appareil de lecture video |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2001238182A (ja) |
AU (1) | AU2001225494A1 (ja) |
WO (1) | WO2001063920A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8280234B2 (en) | 2007-03-09 | 2012-10-02 | Kabushiki Kaisha Toshiba | Video server, video editing system, and method for recording and reproducing video data of the video server |
JP2017536783A (ja) * | 2015-08-28 | 2017-12-07 | 小米科技有限責任公司Xiaomi Inc. | ビデオ特効処理方法、装置、端末機器、プログラム、及び記録媒体 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100411437B1 (ko) * | 2001-12-28 | 2003-12-18 | 엘지전자 주식회사 | 지능형 뉴스 비디오 브라우징 시스템 |
US7406123B2 (en) * | 2003-07-10 | 2008-07-29 | Mitsubishi Electric Research Laboratories, Inc. | Visual complexity measure for playing videos adaptively |
JP5421627B2 (ja) | 2009-03-19 | 2014-02-19 | キヤノン株式会社 | 映像データ表示装置及びその方法 |
JP5404338B2 (ja) * | 2009-11-17 | 2014-01-29 | キヤノン株式会社 | コンテンツ再生装置及びその制御方法 |
JP2011114801A (ja) * | 2009-11-30 | 2011-06-09 | Olympus Imaging Corp | 表示装置、撮影装置、及び、表示方法 |
JP6252921B1 (ja) * | 2016-08-31 | 2017-12-27 | パナソニックIpマネジメント株式会社 | 監視カメラシステム及び再生方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS62263787A (ja) * | 1986-05-10 | 1987-11-16 | Sony Corp | 再生装置 |
JPH06121282A (ja) * | 1992-10-09 | 1994-04-28 | Matsushita Electric Ind Co Ltd | 動画像高速再生装置 |
JPH07143433A (ja) * | 1993-11-16 | 1995-06-02 | Canon Inc | 再生装置及び記録再生装置 |
JPH08298646A (ja) * | 1995-04-26 | 1996-11-12 | Victor Co Of Japan Ltd | 高速サーチ画像再生装置 |
JPH11205753A (ja) * | 1998-01-08 | 1999-07-30 | Jisedai Joho Hoso System Kenkyusho:Kk | 動画閲覧方法及び装置 |
JPH11275508A (ja) * | 1998-03-25 | 1999-10-08 | Sanyo Electric Co Ltd | 画像再生装置およびビデオテープレコーダ |
JPH11355729A (ja) * | 1998-04-28 | 1999-12-24 | Lg Electronics Inc | 動映像の適応的ディスプレイ速度自動調節装置及びその製造方法 |
-
2000
- 2000-02-23 JP JP2000045470A patent/JP2001238182A/ja not_active Withdrawn
-
2001
- 2001-01-11 AU AU2001225494A patent/AU2001225494A1/en not_active Abandoned
- 2001-01-11 WO PCT/JP2001/000101 patent/WO2001063920A1/ja active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62263787A (ja) * | 1986-05-10 | 1987-11-16 | Sony Corp | 再生装置 |
JPH06121282A (ja) * | 1992-10-09 | 1994-04-28 | Matsushita Electric Ind Co Ltd | 動画像高速再生装置 |
JPH07143433A (ja) * | 1993-11-16 | 1995-06-02 | Canon Inc | 再生装置及び記録再生装置 |
JPH08298646A (ja) * | 1995-04-26 | 1996-11-12 | Victor Co Of Japan Ltd | 高速サーチ画像再生装置 |
JPH11205753A (ja) * | 1998-01-08 | 1999-07-30 | Jisedai Joho Hoso System Kenkyusho:Kk | 動画閲覧方法及び装置 |
JPH11275508A (ja) * | 1998-03-25 | 1999-10-08 | Sanyo Electric Co Ltd | 画像再生装置およびビデオテープレコーダ |
JPH11355729A (ja) * | 1998-04-28 | 1999-12-24 | Lg Electronics Inc | 動映像の適応的ディスプレイ速度自動調節装置及びその製造方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8280234B2 (en) | 2007-03-09 | 2012-10-02 | Kabushiki Kaisha Toshiba | Video server, video editing system, and method for recording and reproducing video data of the video server |
JP2017536783A (ja) * | 2015-08-28 | 2017-12-07 | 小米科技有限責任公司Xiaomi Inc. | ビデオ特効処理方法、装置、端末機器、プログラム、及び記録媒体 |
US10212386B2 (en) | 2015-08-28 | 2019-02-19 | Xiaomi Inc. | Method, device, terminal device, and storage medium for video effect processing |
Also Published As
Publication number | Publication date |
---|---|
JP2001238182A (ja) | 2001-08-31 |
AU2001225494A1 (en) | 2001-09-03 |
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