WO1992020191A1 - Video signal decompression apparatus for independently compressed even and odd field data________________________________________ - Google Patents
Video signal decompression apparatus for independently compressed even and odd field data________________________________________ Download PDFInfo
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- WO1992020191A1 WO1992020191A1 PCT/US1992/001794 US9201794W WO9220191A1 WO 1992020191 A1 WO1992020191 A1 WO 1992020191A1 US 9201794 W US9201794 W US 9201794W WO 9220191 A1 WO9220191 A1 WO 9220191A1
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Classifications
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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
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
- H04N19/51—Motion estimation or motion compensation
- H04N19/577—Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
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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
- H04N19/174—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 slice, e.g. a line of blocks or a group of blocks
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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
- H04N19/42—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
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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
- H04N19/60—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
- H04N19/85—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
- H04N19/895—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 in combination with error concealment
Definitions
- FIGURE 1A An exemplary sequence of I, B and P encoded frames is illustrated in FIGURE 1A.
- the upper blocks correspond to odd fields of interlaced image data, and the lower blocks correspond to even fields of interlaced image data.
- the MPEG system protocol designates that only the odd fields of respective frames are to be encoded.
- the exemplary sequence includes 9 frames of I, B and P encoded data which sequences occur cyclically.
- the amount of encoded data of I frames is significantly greater than the amount of encoded data of P frames, and the amount of encoded data of B frames is less than that of encoded P frames.
- the number of P frames between I frames and the number of B frames between P or I and P frames is variable, i.e., it is user selectable within certain constraints. Nominally this selection is dependent upon the channel bandwidth and image content.
- the level of encoding provided by the MPEG protocol (e.g., odd fields only and a continuous data transfer rate of 1.5 M bits/S) is sufficient to produce acceptable images in the computer display environment.
- the MPEG protocol as defined will not provide images of current broadcast quality. It will also be recognized that minor modifications to the protocol will provide sufficient data to produce broadcast quality television images or even HDTV images. These changes include doubling the number of fields to be encoded as well as increasing the number of lines per field and the number of pixels per line. However, even with such modifications to the MPEG protocol, certain deficiencies will still exist to preclude acceptable performance with respect to image reception.
- the present invention is directed to apparatus for decompressing image data in which odd and even fields of image data have been independently encoded according to respective sequences of intra- and interframe compression modes.
- FIGURE 5 is a block diagram of an exemplary video signal decompression apparatus.
- the row of boxes corresponds to respective fields of encoded video signal.
- Even and odd numbered boxes correspond to even and odd fields respectively.
- the type of encoding applied to the respective fields (I, B or P) is indicated by the letter above each box.
- the sequence of odd fields corresponds to the MPEG protocol. Adding the even fields to the sequence, increasing the number of lines per field and the number of pixels per line modifies the protocol to provide sufficient information for television image reproduction.
- FIGURE IB illustrates an improved coding format, according to the invention, for reducing image reproduction latency and concealing signal transmission data loss or corruption.
- the even fields are encoded independently of the odd fields and the intraframe encoded fields are offset by approximately one half the number of fields in the cyclic sequence.
- the advantages that flow from the FIGURE IB sequence are as follows. To begin image reproduction an I field/frame is required. The sequence of
- FIGURE IB includes an I field/frame every 9 fields whereas the sequence of FIGURE 1A includes an I field/frame only every 17 fields.
- the FIGURE IB sequence provides signal entry points at intervals one-half as long as the intervals of the sequence of FIGURE 1A, without increasing the amount of coded data.
- An image may be reproduced from only even field data or only odd field data, albeit with half vertical resolution.
- the rapidly reproduced lower resolution image is significantly more acceptable than waiting twice as long for a full resolution image.
- error concealment assume that data is lost from a portion of the I fields 1 and 2 of FIGURE 1A.
- the video signal from the source 10 is coupled to a multiplexer 12 which passes even fields of video data to a first compressor apparatus 16 and odd fields of video data to a second compressor apparatus 17.
- the multiplexer 12 is controlled by a system control circuit 14, which is responsive to field interval timing signals provided by the video source 10.
- the elements 104 and 105 may be realized using integrated circuits of the type designated STI 3220 MOTION ESTIMATION PROCESSOR available from SGS- THOMSON MICROELECTRONICS. In order to achieve the necessary processing rates each of the elements 104 and 105 may comprise a plurality of such integrated circuits operating simultaneously on different areas of respective images.
- This data is applied to the DCT and quantizer element 109 which provides quantized transform coefficients to elements 110 and 112.
- Element 112 performs inverse quantization and inverse DCT transformation of the coefficients to generate a reconstructed image.
- the reconstructed image is applied via an adder 113 to, and stored in, the even field section of one of the buffer storage elements 114 and 115 for use in compressing subsequent B and P fields.
- no information is added (by adder 113) to the reconstructed image data provided by element 112.
- Element 110 performs variable length encoding (VLC) of the DCT coefficients generated by element 109.
- VLC codewords are applied to a formatter 111 which segments the data and appends appropriate header information to facilitate decoding.
- Coded data from element 111 is then passed to a further buffer memory (not shown).
- the formatter may also be arranged to provide field indicia to the transport packetizing circuit for generating corresponding transport block headers.
- Each of the elements 109, 110 and 111 are controlled by the system controller 116 to cyclically perform the appropriate operations at the appropriate times.
- Element 105 responsive to data from field 6 stored in memory 100 and data from I field 10 stored in memory 102, generates backward motion vectors and corresponding distortion signals which are also coupled to the analyzer 106.
- Analyzer 106 compares the distortion signals against a threshold, and if both exceed the threshold, provides both the forward and backward motion vectors as the motion vector, and also provides a corresponding signal related to the ratio of the distortion signals.
- predicted images are generated using both forward and backward vectors and corresponding field data from which derived.
- An interpolated field is generated from the forward and backward predicted fields in accordance with the ratio of distortion signals.
- P fields are similarly encoded except that only forward motion vectors are generated.
- P field 16 is encoded with motion vectors associating corresponding blocks of I field 10 and P field 16.
- element 112 provides corresponding decoded residues
- element 107 provides the corresponding predicted P field.
- the predicted field and the residues are added in adder 113 on a pixel-by-pixel basis to generate the reconstructed field which is stored in the even field section of the one of storage elements 114 and 116 not containing the even field information from which the predicted even P field is generated.
- the reconstructed and stored even P field is used for encoding subsequent even B fields.
- Transport processing circuit 43 includes an error check/correction circuit, which, responsive to the error check codes appended to the transmitted signal, corrects signal errors incurred during transmission. If uncorrectable errors occurred a flag is generated and communicated to the receiver system controller 42.
- the transport processor 43 responsive to transport header information included in the transport blocks, identifies odd and even fields of data, and reconfigures the transmitted signal from transport block format, to a format which is in conformance with compressed information provided by the buffers 18 and 19 of FIGURE 2.
- the reconfigured data is coupled to a multiplexer 44.
- each field of data is provided by the multiplexer 320 an interpolated field of image data is generated from the current field and stored in the field memory 324 for substitution in whole or in part in the next occurring field.
- fields of data are alternately applied to the display RAM from the multiplexer 320 and the field memory 324.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92912690A EP0611511B1 (en) | 1991-04-29 | 1992-03-12 | Video signal decompression apparatus for independently compressed even and odd field data |
DE69219786T DE69219786T2 (en) | 1991-04-29 | 1992-03-12 | Device for decompressing video data for independently compressed even and odd data fields |
CA002109520A CA2109520C (en) | 1991-04-29 | 1992-03-12 | Video signal decompression apparatus for independently compressed even and odd field data |
JP51180392A JP3462208B2 (en) | 1991-04-29 | 1992-03-12 | Video signal decompressor for independently compressed even and odd field data |
KR1019930703261A KR100240176B1 (en) | 1991-04-29 | 1993-03-12 | Video signal decompression apparatus for independently compressed even and odd field data |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US692,868 | 1991-04-29 | ||
US07/692,868 US5146325A (en) | 1991-04-29 | 1991-04-29 | Video signal decompression apparatus for independently compressed even and odd field data |
Publications (1)
Publication Number | Publication Date |
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WO1992020191A1 true WO1992020191A1 (en) | 1992-11-12 |
Family
ID=24782369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1992/001794 WO1992020191A1 (en) | 1991-04-29 | 1992-03-12 | Video signal decompression apparatus for independently compressed even and odd field data________________________________________ |
Country Status (8)
Country | Link |
---|---|
US (1) | US5146325A (en) |
EP (2) | EP0611511B1 (en) |
JP (2) | JP3462208B2 (en) |
KR (1) | KR100240176B1 (en) |
CA (1) | CA2109520C (en) |
DE (2) | DE69219786T2 (en) |
MX (1) | MX9201960A (en) |
WO (1) | WO1992020191A1 (en) |
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Also Published As
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EP0730385A2 (en) | 1996-09-04 |
EP0730385B1 (en) | 2003-01-29 |
US5146325A (en) | 1992-09-08 |
EP0730385A3 (en) | 1997-09-17 |
DE69219786D1 (en) | 1997-06-19 |
EP0611511A1 (en) | 1994-08-24 |
JPH06507287A (en) | 1994-08-11 |
DE69232913D1 (en) | 2003-03-06 |
KR100240176B1 (en) | 2000-01-15 |
CA2109520C (en) | 2002-05-07 |
CA2109520A1 (en) | 1992-10-30 |
JP2003304542A (en) | 2003-10-24 |
DE69232913T2 (en) | 2003-11-06 |
MX9201960A (en) | 1992-11-01 |
EP0611511B1 (en) | 1997-05-14 |
DE69219786T2 (en) | 1997-08-28 |
JP3462208B2 (en) | 2003-11-05 |
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