Methods and systems for extended spatial scalability with picture-level adaptation
First Claim
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1. A method for picture-level adaptation in a spatially-scalable video codec, said method comprising:
- a) defining a first cropping window at a first location in a first picture of an input video sequence;
b) generating a first base layer corresponding to said first cropping window;
c) defining a second cropping window at a second location, not coincident to said first location, in a second picture of said input video sequence; and
d) generating a second base layer corresponding to said second cropping window.
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Abstract
Embodiments of the present invention comprise systems and methods for modification of motion vectors in spatial scalable video coding. Some embodiments of the present invention comprise methods and systems designed for use with the Scalable Video Coding extension of H.264/MPEG-4 AVC.
191 Citations
20 Claims
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1. A method for picture-level adaptation in a spatially-scalable video codec, said method comprising:
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a) defining a first cropping window at a first location in a first picture of an input video sequence;
b) generating a first base layer corresponding to said first cropping window;
c) defining a second cropping window at a second location, not coincident to said first location, in a second picture of said input video sequence; and
d) generating a second base layer corresponding to said second cropping window. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for predicting an enhancement layer area, defined by a cropping window, from a base layer in a spatially-scalable video codec, said method comprising:
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a) calculating a base-layer motion vector in a direction for an image block in said base layer;
b) scaling said base-layer motion vector based on the ratio of a dimension of said cropping window in said direction to a dimension of said base layer in said direction; and
c) adjusting said scaled motion vector to account for motion of said cropping window relative to a location of a cropping window in a reference picture. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A system for predicting an enhancement layer area, defined by a cropping window, from a base layer in a spatially-scalable video codec, said system comprising:
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a) a calculator for calculating a base-layer motion vector in a direction for an image block in said base layer;
b) a scaler for scaling said base-layer motion vector based on the ratio of a dimension of said cropping window in said direction to a dimension of said base layer in said direction; and
c) an adjustor for adjusting said scaled motion vector to account for motion of said cropping window from a location of a cropping window in a reference picture. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification