EP0557948A2
Expired / Lapsed
EP
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Motion compensating inter-frame predictive picture coding apparatus
Assignee: NEC Corp
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Filing: 1993-02-24
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Granted: —
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Expires: 2013-02-24
Abstract
Abstract A motion picture coding apparatus for storage medium of a video rate which is produced at a low cost is disclosed. The coding apparatus comprises input picture re-arranging means (1) for changing the order of frames of input motion pictures, a storage circuit (2) for storing therein decoded pictures of intra-coded and predictive coded pictures, address generating means (3), motion detecting means (4) for performing multi-stage motion vector search, predictive signal generating means (5) for outputting an inter-frame predictive signal and a predictive difference signal, quantizing means (6), variable length coding means (7), and locally decoding means (8). The predictive signal generating means (5) simultaneously fetches data read out from the storage circuit (2) to the motion detecting means (4) for final stage vector search to reduce access to the storage circuit (2). The locally decoded pictures are placed back to those in order of reproduced frames to monitor the decoded picture signal by a storage circuit for storing therein decoded pictures of intra-coded and predictive coded pictures of an output of the locally decoding means (8) and address generating means.
Inventors
- 👤 Ichiro c/o NEC Corporation Tamitani
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:55
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/144; H04N5/145; H04N19/00; H04N19/42; H04N19/43; H04N19/433; H04N19/50; H04N19/503; H04N19/51; H04N19/523; H04N19/533; H04N19/577; H04N19/85
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
264 words
A motion picture coding apparatus for coding picture frames of an input motion picture signal as at least three kinds of inter-frame predictive pictures of an intra-coded picture, a predictive coded picture and a bidirectionally predictive coded picture, characterized in that it comprises: input picture rearranging means (1) for changing the order of the frames of the input motion pictures based on inter-frame prediction; a first storage circuit (2) for storing therein decoded pictures decoded from intra-coded pictures and predictive coded pictures; first address generating means (3) for controlling inputting and outputting of said first storage circuit (2); motion detecting means (4) for detecting motion vectors between the decoded pictures stored in said first storage circuit (2) and an output of said input picture re-arranging means (1); predictive signal generating means (5) for generating an inter-frame predictive signal from the detected motion vectors and the decoded pictures stored in said first storage circuit (2) and for producing and outputting a prediction difference signal representative of a difference of the inter-frame predictive signal from the output of said input picture re-arranging means (1); quantizing means (6) for quantizing the prediction difference signal; variable length coding means (7) for coding an output of said quantizing means (6) by variable length coding; and locally decoding means (8) for inputting the output of said quantizing means (6) and the inter-frame prediction signal and producing decoded pictures of the intra-coded pictures and predictive coded pictures; said motion detecting means (4) controlling said first address generating means (3) based on the detected motion vectors to realize multi-stage motion vector search.
Claim 2
Dependent Claim
42 words
A motion picture coding apparatus as set forth in claim 1, characterized in that said predictive signal generating means (2) simultaneously fetches data read out for last stage vector search from said first storage circuit (2) by said motion detecting means (4).
Claim 3
Dependent Claim
100 words
A motion picture coding apparatus as set forth in claim 1 or 2, characterized in that it further comprises a second storage circuit (9), and an intra-coded picture or a predictive coded picture of the output of said input picture frame re-arranging means (1) is stored into said second storage circuit (9) while said motion detecting means (4) detects motion vectors between the input pictures stored in said second storage circuit (9) and the output of said input picture re-arranging means (1), inputting and outputting of said second storage circuit (9) being controlled by said first address generating means (3).
Claim 4
Dependent Claim
70 words
A motion picture coding apparatus as set forth in claim 3, characterized in that said prediction signal generating means (5) simultaneously reads out, from said first storage circuit (2), decoded data at the same address as the input picture data read out for last stage vector search from said second storage circuit (9) by said motion detecting means (4) and uses the read out decoded data for generation of prediction.
Claim 5
Dependent Claim
115 words
A motion picture coding apparatus as set forth in any of claims 1 to 4, characterized in that the vector search of said motion detecting means (4) is K-stage motion vector search wherein motion vector search with the accuracy of two picture elements is performed at the first stage to the K-1th stage and then motion vector search with the accuracy of one picture element or less is performed at the Kth stage, and in the vector search from the first stage to the K-1th stage, only those picture elements of the picture signal stored in said first or second storage circuit (2 or 9) which are sampled in a grid-like pattern are referred to.
Claim 6
Dependent Claim
94 words
A motion picture coding apparatus as set forth in any of claims 1 to 4, characterized in that it further comprises a third storage circuit (10) for storing therein the output of said locally decoding means (8), second address generating means (11) for controlling inputting and outputting of said third storage circuit (10), and an output port (19) for outputting output data from said third storage circuit (10) or said locally decoding means (8) to the outside, and said locally decoding means (8) also generates a decoded picture of a bidirectionally predictive coded picture.
Claim 7
Dependent Claim
89 words
A motion picture coding apparatus as set forth in claim 6, characterized in that a decoded picture of a bidirectionally predictive coded picture obtained from said locally decoding means (8) is outputted to said output port (19) while a decoded picture of an intra-coded picture or a predictive coded picture is outputted to said output port (19) after it is stored into said third storage circuit (10) so as to arrange locally decoded pictures of the coded pictures back into those in order of reproduced frames and output them.
Claim 8
Dependent Claim
84 words
A motion picture coding apparatus as set forth in claim 6, characterized in that decoded pictures of intra-coded pictures, predictive coded pictures and bidirectionally predictive coded pictures obtained from said locally decoding means (8) are outputted, after they are all stored into said third storage circuit (10), to said output port (19) so as to arrange locally decoded pictures of the coded pictures back into those in order of reproduced frames, change the intra-screen scanning order of them and output them to the outside.
Claim 9
Dependent Claim
108 words
A motion picture coding apparatus as set forth in claim 7 or 8, characterized in that it far comprises variable length decoding means (12) for decoding a variable length code word supplied from the outside by variable length coding, and said second address generating means (11) controls reading out of predictive picture data from said third storage circuit (10) using a motion vector decoded by said variable length decoding means (12) while said locally decoding means (8) produces a decoded picture from predictive picture data read out from said third storage circuit (10) and the output of said variable length decoding means (12) to realize a reproducing function.
Claim 10
Dependent Claim
90 words
A motion picture coding apparatus as set forth in claim 9, characterized in that a decoded picture of a bidirectionally predictive coded picture obtained from said locally decoding means (8) is outputted to said output port (19) while a decoded picture of an intra-coded picture or a predictive picture obtained from said locally decoding means (19) is outputted, after it is stored into said third storage means (10), to said output (19) so as to arrange the decoded pictures back to those in order of reproduced frames and output them.
Claim 11
Dependent Claim
75 words
A motion picture coding apparatus as set forth in claim 9, characterized in that decoded pictures of intra-coded pictures, predictive coded pictures and bidirectionally predictive coded pictures obtained from said locally decoding means (8) are outputted, after they are all stored into said third storage means (10), to said output port (19) to arrange the decoded pictures back to those in order of reproduced frames, change the intra-screen scanning order of them and output them.
References Cited (Backward Citations)
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