CA2490378A1 - Improved interpolation of video compression frames - Google Patents

Improved interpolation of video compression frames Download PDF

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CA2490378A1
CA2490378A1 CA002490378A CA2490378A CA2490378A1 CA 2490378 A1 CA2490378 A1 CA 2490378A1 CA 002490378 A CA002490378 A CA 002490378A CA 2490378 A CA2490378 A CA 2490378A CA 2490378 A1 CA2490378 A1 CA 2490378A1
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frames
referenceable
frame
predicted
sequence
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CA2490378C (en
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Gary A. Demos
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Dolby Laboratories Licensing Corp
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Abstract

A method, system, and computer programs for improving the image quality of o ne or more predicted frames in a video image compression system, where each fra me comprises a plurality of pixels. A picture region of macroblock of certain types of frames can be encoded by reference to one or more referenceable frames in some cases, and by reference to two or more refenenceable frames i n other cases. Such encoding may include interpolation, such as an unequal weighting. The DC value or AC pixel values of a picture region may be interpolated as well, with or without weighting. A code pattern of such fram es having a variable number of bidirectional predicted frames can be dynamicall y determined. Frames can be transmitted from an encoder to a decoder in a delivery order different from a display order. Sharpening and/or softening filters can be applied to a picture region of certain frames during motion vector compensated prediction.

Claims (19)

1. A method for video image compression, the method comprising:
providing a sequence of frames including picture regions, the frames including predicted frames and referenceable frames; and encoding a picture region of at least one predicted frame by reference to two or more prior referenceable frames in the sequence.
2. The method of claim 1, wherein said at least one predicted frame comprises a referenceable frame.
3. The method of claim 1, wherein said referenceable frames comprise predicted frames and infra frames.
4. The method of claim 1, wherein said predicted frames comprise referenceable predicted frames and bidirectional predicted frames.
5. The method of claim 4, wherein said at least one predicted frame comprises a bidirectional predicted frame.
6. The method of claim 5, further comprising:
wherein encoding a picture region of a bidirectional predicted frame by reference to two or more subsequent referenceable frames in the sequence.
7. The method of claim 1, further comprising:
identifying at least one of said two or more previous referenceable frames.
8. The method of claim 1, wherein said encoding comprises encoding using an unequal weighting of selected picture regions from said two or more previous referenceable frames.
9. The method of claim 8, further comprising:
identifying said unequal weighting.
10. The method of claim 8, wherein the unequal weighting includes weights greater than one or less than zero.
11. The method of claim 8, wherein the frames comprise frames arranged in picture regions, and wherein said encoding comprises encoding using unequal pixel values corresponding to said two or more referenceable frames.
12. The method of claim 1, wherein the sequence of frames include referenceable frames and bidirectional predicted frames, each of said frames including pixel values arranged in macroblocks.
13. The method of claim 12, further comprising:
determining at least one macroblock within a bidirectional predicted frame using direct mode prediction based on motion vectors from one or more predicted frames in display order.
14. The method of claim 13, wherein said encoding comprises encoding using an unequal weighting of selected picture regions from said two or more previous referenceable frames.
15. The method of claim 14, wherein at least one such motion vector is scaled by a frame scale fraction of less than zero or greater than one.
16. A method for video image compression, the method comprising:
providing a sequence of frames including picture regions, the frames including bidirectional predicted (B) frames and referenceable frames including predicted (P) frames and intra (I) frames; and encoding a picture region of at least one P frame by reference to a prior referenceable frame in the sequence, wherein said prior referenceable frame is spaced from said P frame by at least one intervening referenceable frame.~
17. The method of claim 16, further comprising:
identifying the prior referenceable frame; and signaling a decoder with said identification.
18. A method, in a video image compression system having a sequence of referenceable and bidirectional predicted frames, for dynamically determining a code pattern of such frames having a variable number of bidirectional predicted frames, the method including:
selecting an initial sequence beginning with a referenceable frame, having at least one immediately subsequent bidirectional predicted frame, and ending in a referenceable frame;
adding a referenceable frame to the end of the initial sequence to create a test sequence;
evaluating the test sequence against a selected evaluation criteria;
for each satisfactory step of evaluating the test sequence, inserting a bidirectional frame before the added referenceable frame and repeating the step of evaluating; and if the step of evaluating the test sequence is unsatisfactory, then accepting the prior test sequence as a current code pattern.
19. The method of claim 18, further comprising:
determining an interpolation blend proportion for at least one picture region of the frames of a selected test sequence.
CA2490378A 2002-06-28 2003-06-27 Improved interpolation of video compression frames Expired - Lifetime CA2490378C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/187,395 US7266150B2 (en) 2001-07-11 2002-06-28 Interpolation of video compression frames
US10/187,395 2002-06-28
PCT/US2003/020397 WO2004004310A2 (en) 2002-06-28 2003-06-27 Improved interpolation of video compression frames

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CA2490378A1 true CA2490378A1 (en) 2004-01-08
CA2490378C CA2490378C (en) 2010-06-08

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US (45) US7266150B2 (en)
EP (6) EP2458863A3 (en)
JP (1) JP2006513592A (en)
KR (1) KR100748194B1 (en)
CN (10) CN1663258B (en)
AU (3) AU2003247759B2 (en)
CA (1) CA2490378C (en)
DK (2) DK2254339T3 (en)
ES (2) ES2780055T3 (en)
HK (8) HK1148888A1 (en)
HU (2) HUE048316T2 (en)
MX (1) MXPA05000065A (en)
MY (9) MY184819A (en)
PT (2) PT2254339T (en)
SI (2) SI2254339T1 (en)
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