WO2001006795A1 - Video coding - Google Patents
Video coding Download PDFInfo
- Publication number
- WO2001006795A1 WO2001006795A1 PCT/EP2000/006732 EP0006732W WO0106795A1 WO 2001006795 A1 WO2001006795 A1 WO 2001006795A1 EP 0006732 W EP0006732 W EP 0006732W WO 0106795 A1 WO0106795 A1 WO 0106795A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- data
- picture
- header
- frame
- decoder
- Prior art date
Links
Classifications
-
- 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
- H04N19/65—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using error resilience
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- 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
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- 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
-
- 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
- H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
- H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
- H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
-
- 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
- H04N19/46—Embedding additional information in the video signal during the compression process
-
- 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
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
-
- 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
- H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
Definitions
- Video compression methods typically differentiate between images which do or do not utilise temporal redundancy reduction.
- Compressed images which do not utilise temporal redundancy reduction methods are usually called INTRA or l-frames whereas temporally predicted images are called INTER or P-frames (and also B-frames when the INTER frames may be predicted in a forward or backward manner).
- INTRA or l-frames temporally predicted images
- INTER or P-frames and also B-frames when the INTER frames may be predicted in a forward or backward manner.
- the predicted (motion-compensated) image is rarely precise enough and therefore a spatially compressed prediction error image is also a part of each INTER frame.
- H.263 is an ITU-T recommendation of video coding for low bit-rate communication which generally means data rates below 64 kbps. The recommendation specifies the bitstream syntax and the decoding of the bitstream.
- Version 1 consists of the core algorithm and four optional coding modes.
- H.263 version 2 is an extension of version 1 providing twelve new negotiable coding modes.
- H.263 is currently one of the most-favoured coding methods proposed for mobile wireless applications, where the bit rate is of the order of 28.8 bits per second and Quarter Common Intermediate Format (QCIF) pictures of 176x144 pixels are usually used.
- QCIF Quarter Common Intermediate Format
- the expected bit rates for third generation wireless products is around 64kbps and the image resolution may be higher.
- Figure 5 shows the data structure of an encoded video signal output by an encoder according to a first embodiment of the invention
- the video signal represents a sequence of frames where each frame is a still image. When displayed in sequence, the frames provide the impression of an image containing movement. Thus the sequence of frames are referred to herein as a moving image.
- the codec 10 encodes the moving image from the signal source (not shown) and decodes a received signal representing a moving image for display on the display 70.
- the repeated data relates to an incomplete part of a frame and in particular to the picture header and the data for the first segment of the picture.
- a decoder according to the invention therefore detects the presence of repeated data by detecting that data for an incomplete frame has been received and uses stored data to complete the frame.
- the redundant frame of repeated data 612 contains a picture header 80' of around 50 bits, 99 COD bits (one for each of the 99 macroblocks within a QCIF picture) and some stuffing bits to make up an integer number of bits for a complete frame.
- a redundant frame typically consists of 19 bytes and thus adds around 8% of overhead to the data stream for a 28.8 kbps H.263 connection and a QCIF picture.
- This overhead value applies only if each INTRA frame and each INTER frame is associated with a redundant frame.
- the overhead may be reduced if a redundant frame is encoded after each INTRA frame only.
- This proposed method introduces a considerable delay compared with the previous embodiments when recovering a corrupted picture header, since the recovery cannot take place until the beginning of the next picture is received.
- the operation of a decoder is typically faster than real-time video-data transmission at least at low frame rates, the decoder is likely to be able to recover the time spent for waiting the next picture to arrive.
- the repeated picture header may be repeated without the PSC.
- the header could be manipulated by a systematic error-correcting code.
- a systematic error-correcting code is such that k first symbols are the actual message and the rest of the symbols are used for error checking.
- k first bits are the picture header, and the rest of the bits are transmitted as Supplemental Enhancement Information in the next frame. Consequently, the selection of the error-correcting code affects how many bit inversion errors can be detected and corrected and how many supplemental bits are needed to provide this error protection.
- the encoder 100 has been pre-programmed to send picture header repeats. However the encoder 100 can be arranged additionally to repeat or refresh the picture data in response to a command from a decoder.
- the decoder If the decoder is unable to decode the first picture header, but is able to detect other segments of the picture (e.g. the GBSC of the second segment 84) then the decoder stores this data in the temporary picture data store 228. When the decoder receives, decodes and identifies the repeated header data (and the first segment data 82), the decoder then uses the data in the temporary picture store to reproduce the rest of the picture.
- Figure 8 shows a flow diagram illustrating a method of operating a decoder according to the first embodiment of the invention.
- the decoder 200 starts to decode a received signal by checking if a picture start code (PSC) is the next code in the incoming data. If the picture header is deemed to be corrupted (402), the controller stores (404) the picture data associated with the remaining segments of the picture in the temporary picture data store 228.
- PSC picture start code
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0011748A BRPI0011748B1 (en) | 1999-07-19 | 2000-07-14 | encoding and decoding method and apparatus, wireless communication apparatus with embedded encoder, and video codec |
AT00949342T ATE296015T1 (en) | 1999-07-19 | 2000-07-14 | VIDEO CODING |
EP00949342A EP1205076B1 (en) | 1999-07-19 | 2000-07-14 | Video coding |
AU62735/00A AU774040B2 (en) | 1999-07-19 | 2000-07-14 | Video coding |
CA002377865A CA2377865C (en) | 1999-07-19 | 2000-07-14 | Video coding using repeated header data |
DE60020243T DE60020243T2 (en) | 1999-07-19 | 2000-07-14 | VIDEO CODING |
JP2001510493A JP4969003B2 (en) | 1999-07-19 | 2000-07-14 | Image decoding method, image encoding method, image encoder, image decoder, wireless communication device, and image codec |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9916909.6 | 1999-07-19 | ||
GB9916909A GB2352350B (en) | 1999-07-19 | 1999-07-19 | Video coding |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001006795A1 true WO2001006795A1 (en) | 2001-01-25 |
Family
ID=10857513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/006732 WO2001006795A1 (en) | 1999-07-19 | 2000-07-14 | Video coding |
Country Status (14)
Country | Link |
---|---|
US (3) | US7006576B1 (en) |
EP (2) | EP1542475B1 (en) |
JP (1) | JP4969003B2 (en) |
KR (1) | KR100495820B1 (en) |
CN (3) | CN101175213B (en) |
AT (2) | ATE296015T1 (en) |
AU (1) | AU774040B2 (en) |
BR (1) | BRPI0011748B1 (en) |
CA (1) | CA2377865C (en) |
DE (1) | DE60020243T2 (en) |
ES (1) | ES2240128T3 (en) |
GB (1) | GB2352350B (en) |
HK (1) | HK1114494A1 (en) |
WO (1) | WO2001006795A1 (en) |
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- 1999-07-19 GB GB9916909A patent/GB2352350B/en not_active Revoked
-
2000
- 2000-07-14 KR KR10-2002-7000651A patent/KR100495820B1/en active IP Right Grant
- 2000-07-14 EP EP05075667A patent/EP1542475B1/en not_active Expired - Lifetime
- 2000-07-14 AT AT00949342T patent/ATE296015T1/en not_active IP Right Cessation
- 2000-07-14 CN CN2007101851538A patent/CN101175213B/en not_active Expired - Lifetime
- 2000-07-14 WO PCT/EP2000/006732 patent/WO2001006795A1/en active IP Right Grant
- 2000-07-14 ES ES00949342T patent/ES2240128T3/en not_active Expired - Lifetime
- 2000-07-14 JP JP2001510493A patent/JP4969003B2/en not_active Expired - Lifetime
- 2000-07-14 AT AT05075667T patent/ATE533306T1/en active
- 2000-07-14 CN CN201010147737A patent/CN101790099A/en active Pending
- 2000-07-14 CA CA002377865A patent/CA2377865C/en not_active Expired - Lifetime
- 2000-07-14 BR BRPI0011748A patent/BRPI0011748B1/en active IP Right Grant
- 2000-07-14 CN CN00810573A patent/CN1361991A/en active Pending
- 2000-07-14 AU AU62735/00A patent/AU774040B2/en not_active Expired
- 2000-07-14 DE DE60020243T patent/DE60020243T2/en not_active Expired - Lifetime
- 2000-07-14 EP EP00949342A patent/EP1205076B1/en not_active Expired - Lifetime
- 2000-07-19 US US09/619,660 patent/US7006576B1/en not_active Expired - Lifetime
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2005
- 2005-04-06 US US11/099,596 patent/US8654863B2/en not_active Expired - Fee Related
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2007
- 2007-02-05 US US11/671,439 patent/US8401089B2/en active Active
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2008
- 2008-09-10 HK HK08110054.4A patent/HK1114494A1/en not_active IP Right Cessation
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GB2352350A (en) | 2001-01-24 |
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CA2377865A1 (en) | 2001-01-25 |
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ATE296015T1 (en) | 2005-06-15 |
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US7006576B1 (en) | 2006-02-28 |
KR20020020937A (en) | 2002-03-16 |
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ATE533306T1 (en) | 2011-11-15 |
EP1542475A2 (en) | 2005-06-15 |
US20050185719A1 (en) | 2005-08-25 |
KR100495820B1 (en) | 2005-06-16 |
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JP2003504988A (en) | 2003-02-04 |
GB2352350B (en) | 2003-11-05 |
CN101175213B (en) | 2011-02-09 |
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US8401089B2 (en) | 2013-03-19 |
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