EP0932306A2
Expired / Lapsed
EP
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Method and apparatus for encoding video shape and texture information
Assignee: AT&T Inc
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Filing: 1999-01-26
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Granted: —
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Expires: 2019-01-26
Abstract
Abstract An encoding apparatus and method adjust texture information for a video object based on original shape information for the video object. The original shape information is not encoded shape information or information that has been encoded and then decoded. In a preferred embodiment, the texture information is adjusted by 0 padding pels near the boundary of the video object in an inter mode, or by lowpass extrapolation filtering pels near the boundary of the video object in an intra mode where the boundary of the video object is defined by the original shape information. Lossy shape encoding can therefore be performed while decreasing the overall encoded bit rate, improving the subjective appearance of the decoded video object and decreasing computational complexity of the encoder and/or encoding method. Adaptive scanning and subsampling of macroblocks can be avoided while having little effect on overall bitrate and significantly decreasing computational complexity of the encoding process.
Inventors
- 👤 Joern Ostermann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:35
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; H04N19/649
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
62 words
A method for encoding texture information for a video object, comprising: identifying a video object in image data representing at least an original
shape and texture information for the video object; generating original shape information that represents an original shape of
the video object; adjusting texture information in the image data using the original shape
information; and encoding the adjusted texture information.
Claim 2
Dependent Claim
24 words
The method of claim 1, wherein the step of generating original shape
information comprises generating a bitmap defining the shape of the video object.
Claim 3
Dependent Claim
26 words
The method of claim 1, wherein the step of generating original shape
information comprises identifying transparent, boundary and opaque macroblocks of pels
of the video object.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein the step of adjusting texture information
comprises padding a texture prediction error for pels using a 0 padding technique.
Claim 5
Dependent Claim
23 words
The method of claim 1, wherein the step of adjusting texture information
comprises padding texture parameters for pels using a lowpass extrapolation filter.
Claim 6
Dependent Claim
41 words
The method of claim 1, wherein the step of adjusting texture information
comprises replicating boundary pels in a horizontal direction, replicating boundary pels in
a vertical direction, and assigning an average value of neighboring pels to transparent
macroblocks bordering boundary blocks.
Claim 7
Dependent Claim
15 words
The method of claim 1, further comprising lossy encoding shape
information for the video object.
Claim 8
Dependent Claim
13 words
The method of claim 1, further comprising lossy encoding shape
information without subsampling.
Claim 9
Dependent Claim
15 words
The method of claim 1, further comprising encoding shape information
without vertical scanning of macroblocks.
Claim 10
Dependent Claim
16 words
The method of claim 1, further comprising smoothing a boundary of the
video object using filtering.
Claim 11
Dependent Claim
39 words
The method of claim 10, wherein the step of smoothing a boundary of the
video object using filtering comprises one of using morphological filtering on an entire
VOP and using morphological filtering on each boundary block of a VOP.
Claim 12
Dependent Claim
52 words
The method of claim 10, wherein the step of smoothing a boundary of the
video object using filtering comprises using morphological filtering on a motion-compensated
shape prediction error using the original shape information as a reference to
avoid change of topology of the video object, minimize bitrate and maintain subjective
image quality.
Claim 13
Dependent Claim
18 words
A computer-readable recording medium containing image data that has
been encoded according to the method of claim 1.
Claim 14
Dependent Claim
86 words
An encoding apparatus comprising: an image analysis module that generates shape, texture and motion
information from image data representing at least a video object; a parameter coding module that adjusts texture information generated by
the image analysis module based on original shape information from the image analysis
module and encodes the adjusted texture information and shape and motion information; a decoding module that decodes encoded texture, shape and motion
information from the parameter coding module; and a memory that stores decoded data from the decoding module.
Claim 15
Dependent Claim
25 words
The encoding apparatus of claim 14, wherein the image analysis module
generates original shape information comprising a bitmap defining a shape of the video
object.
Claim 16
Dependent Claim
35 words
The encoding apparatus of claim 14, wherein the parameter coding module
adjusts texture information by one of padding a texture prediction error for pels using a 0
padding technique and using a lowpass extrapolation filter.
Claim 17
Dependent Claim
43 words
The encoding apparatus of claim 14, wherein the parameter coding module
adjusts texture information by replicating boundary pels in a horizontal direction,
replicating boundary pels in a vertical direction, and assigning an average value of
neighboring pels to transparent macroblocks bordering boundary blocks.
Claim 18
Dependent Claim
15 words
The encoding apparatus of claim 14, wherein the parameter coding module
performs lossy shape coding.
Claim 19
Dependent Claim
17 words
The encoding apparatus of claim 14, wherein the parameter coding module
performs lossy shape coding without subsampling.
Claim 20
Dependent Claim
19 words
The encoding apparatus of claim 14, wherein the parameter coding module
performs shape coding without vertical scanning of macroblocks.
Claim 21
Dependent Claim
21 words
The encoding apparatus of claim 14, further comprising a smoothing
module that smoothes a boundary of the video object using filtering.
Claim 22
Dependent Claim
29 words
The encoding apparatus of claim 21, wherein the smoothing module
applies one of morphological filtering on an entire VOP and morphological filtering on
each boundary block of a VOP.
Claim 23
Dependent Claim
43 words
The encoding apparatus of claim 21, wherein the smoothing module
applies morphological filtering on a motion-compensated shape prediction error using the
original shape information as a reference to avoid change of topology of the video object,
minimize bitrate, and maintain subjective image quality.
Claim 24
Dependent Claim
67 words
An encoding apparatus, comprising: identifying means for identifying a video object in image data representing
at least an original shape and texture information for the video object; generating means for generating original shape information that represents
an original shape of the video object; adjusting means for adjusting texture information in the image data using
the original shape information; and encoding means for encoding the adjusted texture information.
References Cited (Backward Citations)
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