Method and/or apparatus for reducing the complexity of H.264 B-frame encoding using selective reconstruction

• US 7,310,371 B2
• Filed: 05/30/2003
• Issued: 12/18/2007
• Est. Priority Date: 05/30/2003
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: Cote, Guy, Gallant, Michael D., Novotny, Pavel, Winger, Lowell L.
• Primary Examiner(s): Dastouri, Mehrdad
• Assistant Examiner(s): HALLENBECK-HUBER, JEREMIAH CHARLES
• Application Number:
  US10/449,471
• Publication Number:
  US 20040240549A1
• Time in Patent Office: 1,663 Days
• Field of Search: 37524014-24017
• US Class Current: 375/240.15
• CPC Class Codes: H04N 19/103 Selection of coding mode or of prediction mode
• CPC Class Codes: H04N 19/11 among a plurality of spatial predictive coding modes
• CPC Class Codes: H04N 19/117 Filters, e.g. for pre-processing or post-processing sub-band filter banks H04N19/635
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/86 involving reduction of coding artifacts, e.g. of blockiness

Abstract

An apparatus comprising an output circuit, a first processing circuit and a second processing circuit. The output circuit may be configured to generate an output data stream in response to (i) a first intermediate signal, (ii) a second intermediate signal, and (iii) a third intermediate signal. The first processing circuit may be configured to generate the first intermediate signal in response to (i) a processed video signal and (ii) a prediction flag. The second processing circuit may be configured to generate (i) the processed video signal, (ii) the second intermediate signal and (iii) the third intermediate signal in response to an input video signal.

Claims

1. An apparatus comprising:

an output circuit configured to generate an output data stream in response to (i) a first intermediate signal, (ii) a second intermediate signal, and (iii) a third intermediate signal;

a first processing circuit configured to generate said first intermediate signal in response to (i) a processed video signal and (ii) a prediction flag; and

a second processing circuit configured to generate (i) said processed video signal, (ii) said second intermediate signal and (iii) said third intermediate signal in response to an input video signal, wherein said second processing circuit is further configured to generate a prediction macroblock signal, said processed video signal, said second intermediate signal, and said third intermediate signal in further response to a fourth intermediate signal, wherein said fourth intermediate signal comprises (i) said first intermediate signal when in a first mode and (ii) an inverse guantized, inverse transformed version of said first intermediate signal when in a second mode.

2. The apparatus according to claim 1, wherein said first processing circuit is configured to generate said fourth intermediate signal.

3. The apparatus according to claim 1, wherein said first and second modes are selected in response to said prediction flag.

4. The apparatus according to claim 1, wherein said first and second processing circuits are configured to respond to one or more control signals generated by a control circuit.

5. The apparatus according to claim 1, wherein said output data stream comprises an H.264 compliant bitstream.

6. The apparatus according to claim 1, wherein said input video signal comprises a series of macroblocks.

7. The apparatus according to claim 6, wherein said apparatus operates (i) in a first mode if said prediction flag is on and (ii) a second mode if said prediction flag is off.

8. The apparatus according to claim 1, wherein (i) said first mode comprises an intra prediction mode and (ii) said second mode comprises an inter prediction mode.

9. The apparatus according to claim 1, wherein said apparatus reduces complexity on B-frame macroblock encoding when B-frames are not used for prediction.

10. The apparatus according to claim 1, wherein said output video signal comprises an H.264 compliant encoded bitstream.

11. The apparatus according to claim 1, wherein said prediction flag comprises a constrained intra prediction flag (CIPF).

12. An apparatus comprising:

means for generating an output data stream in response to (i) a first intermediate signal, (ii) a second intermediate signal, and (iii) a third intermediate signal;

means for generating said first intermediate signal in response to (i) a processed video signal and (ii) a prediction flag; and

means for generating (i) said processed video signal, (ii) said second intermediate signal and (iii) said third intermediate signal in response to an input video signal, wherein said means for generating said processed video signal, said second intermediate signal, and said third intermediate signal further generates a prediction macroblock signal and responds to a fourth intermediate signal, wherein said fourth intermediate signal comprises (i) said first intermediate signal when in a first mode and (ii) an inverse guantized, inverse transformed version of said first intermediate signal when in a second mode.