EP0753969A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Model-assisted video coding
Assignee: AT&T Inc
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Filing: 1996-07-03
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Granted: —
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Expires: 2016-07-03
Abstract
Abstract An apparatus responds to a video signal representing a succession of frames, where at least one of the frames corresponds to an image of an object, to detect at least a region of the object. The apparatus includes a processor for processing the video signal to detect at least the region of the object characterized by at least a portion of a closed curve and to generate a plurality of parameters associated with the closed curve for use in coding the video signal.
Inventors
- 👤 Alexandros Eleftheriadis
- 👤 Arnaud Eric Jacquin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:40
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/16; G06V40/161; G10; G10L; G10L19/00; G10L19/012; H; H04; H04N; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/107; H04N19/124; H04N19/126; H04N19/132; H04N19/134; H04N19/136; H04N19/154; H04N19/169; H04N19/17; H04N19/176; H04N19/60; H04N19/61; H04N19/63; H04N19/85; H04N19/115; H04N19/146; H04N19/149; H04N19/15; H04N19/152; H04N19/20
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
72 words
An apparatus for coding a video signal representing a succession of frames, at least one of the frames corresponding to an image of an object, the apparatus comprising: a processor for processing the video signal to detect at least the region of the object characterized by at least a portion of a closed-curve and to generate a plurality of parameters associated with the closed curve for use in coding the video signal.
Claim 2
Dependent Claim
29 words
The apparatus of claim 1 wherein the processor detects at least the region of the object characterized by at least a portion of an ellipse as the closed curve.
Claim 3
Dependent Claim
38 words
The apparatus of claim 2 wherein the processor detects at least the region of a head outline as the object characterized by at least a portion of an ellipse as the closed curve substantially fitting the head outline.
Claim 4
Dependent Claim
29 words
The apparatus of claim 1 wherein the processor detects at least the region of the object characterized by at least a portion of a rectangle as the closed curve.
Claim 5
Dependent Claim
49 words
The apparatus of claim 4 wherein the processor detects at least the eye region of a head as the object characterized by at least the portion of the rectangle as the closed curve having an axis of symmetry substantially parallel to an axis of symmetry of the eye region.
Claim 6
Independent Claim
29 words
The apparatus of claim I wherein the processor detects at least the region of the object characterized by at least a portion of a trapezoid as the closed curve.
Claim 7
Dependent Claim
44 words
The apparatus of claim 6 wherein the processor detects at least the region of the object of an eyes-nose-mouth region of a head as the object characterized by at least a portion of the trapezoid as the closed curve substantially fitting the eyes-nose-mouth region.
Claim 8
Dependent Claim
49 words
The apparatus of claim 1 wherein the processor further includes: a preprocessor for preprocessing the video signal to generate an edge data signal corresponding to an edge of the region of the object; and an object detector for processing the edge data signal to generate the plurality of parameters.
Claim 9
Dependent Claim
55 words
The apparatus of claim 1 further including: a coding controller, responsive to an object detection signal relating to the parameters, for performing buffer size modulation to adjust a quantizer step size used in the coding of the video signal to increase a buffer size for controlling the coding of the detected region of the object.
Claim 10
Independent Claim
56 words
The apparatus of claim I further including: a coding controller, responsive to an object detection signal relating to the parameters, for performing buffer rate modulation to adjust a quantizer step size used in the coding of the video signal to increase a rate of coding for controlling the coding of the detected region of the object.
Claim 11
Dependent Claim
92 words
A coding controller responsive to an object detection signal for controlling the coding of a video signal representing a succession of frames, at least one of the frames corresponding to an image of an object, the object detection signal indicating a detected region of the object, the coding controller comprising: a processor for performing buffer size modulation and responsive to the object detection signal for adjusting a quantizer step size used in the coding of the video signal to increase a buffer size for coding of the detected region of the object.
Claim 12
Dependent Claim
30 words
The coding controller of claim 11 wherein the processor performs the buffer size modulation to adjust the quantizer step size for coding in accordance with the CCITT Rec. H.261 standard.
Claim 13
Dependent Claim
91 words
A coding controller responsive to an object detection signal for controlling the coding of a video signal representing a succession of frames, at least one of the frames corresponding to an image of an object, the object detection signal indicating a detected region of the object, the coding controller comprising: a processor for performing buffer rate modulation and responsive to the object detection signal for adjusting a quantizer step size used in the coding of the video signal to increase a rate of coding of the detected region of the object.
Claim 14
Dependent Claim
29 words
The coding controller of claim 13 wherein the processor performs the rate modulation to adjust the quantizer step size for coding in accordance with the CCITT Rec. H.261 standard.
Claim 15
Independent Claim
78 words
A method, responsive to a video signal representing a succession of frames, at least one of the frames corresponding to an image of an object, for coding at least a region of an object, the method comprising the steps of: detecting at least the region of the object characterized by at least a portion of a closed curve; generating a plurality of parameters associated with the closed curve; and coding the video signal using the plurality of parameters.
Claim 16
Dependent Claim
35 words
The method of claim 15 wherein the step of detecting includes the step of: detecting at least the region of the object characterized by at least a portion of an ellipse as the closed curve.
Claim 17
Dependent Claim
48 words
The method of claim 16 wherein the step of detecting includes the steps of: detecting at least the region of a head outline as the object; and substantially fitting an ellipse to the head outline to characterize at least a portion of an ellipse as the closed curve.
Claim 18
Dependent Claim
35 words
The method of claim 15 wherein the step of detecting includes the step of: detecting at least the region of the object characterized by at least a portion of a rectangle as the closed curve.
Claim 19
Dependent Claim
55 words
The method of claim 18 wherein the step of detecting includes the steps of: detecting at least the eye region of a head as the object; and determining at least the portion of the rectangle as the closed curve having an axis of symmetry substantially parallel to an axis of symmetry of the eye region.
Claim 20
Dependent Claim
35 words
The method of claim 15 wherein the step of detecting includes the step of: detecting at least the region of the object characterized by at least a portion of a trapezoid as the closed curve.
Claim 21
Dependent Claim
45 words
The method of claim 20 wherein the step of detecting includes the steps of: detecting at least the eyes-nose-mouth region of a head as the object; and substantially fitting at least a portion of the trapezoid to characterize the eyes-nose-mouth region as the closed curve.
Claim 22
Dependent Claim
72 words
The method of claim 15 wherein the step of generating the plurality of parameters includes the step of: preprocessing the video signal to generate an edge data signal corresponding to an edge of the region of the object; and wherein the step of detecting includes the step of processing the edge data signal to detect at least the region of the object characterized by at least a portion of a closed curve.
Claim 23
Dependent Claim
33 words
The method of claim 15 further including the step of: adjusting a quantizer step size in response to the object detection signal; and coding the video signal using the adjusted quantizer step size.
Claim 24
Dependent Claim
23 words
The method of claim 23 further including the step of: increasing a buffer size for coding of the detected region of the object.
Claim 25
Dependent Claim
22 words
The method of claim 23 further including the step of: increasing a rate of coding of the detected region of the object.
Claim 26
Independent Claim
74 words
A method, responsive to an object detection signal, for controlling the coding of a video signal representing a succession of frames, at least one of the frames corresponding to an image of an object, the object detection signal indicating a detected region of the object, the method comprising the steps of: adjusting a quantizer step size in response to the object detection signal; and coding the video signal using the adjusted quantizer step size.
Claim 27
Dependent Claim
23 words
The method of claim 26 further including the step of: increasing a buffer size for coding of the detected region of the object.
References Cited (Backward Citations)
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