IMAGE ENCODING-DECODING SYSTEM AND RELATED TECHNIQUES
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Abstract
An image encoding-decoding system and related methods of operation includes an encoder for encoding a signal carrying a representation of an image and a decoder for decoding a signal carrying a representation of an image. The encoder comprising a first encoder for encoding a signal carrying a representation of an image at a first quality level; and a second encoder for encoding a signal carrying a representation of the image at a second quality level at greater quality than the first quality level. The encoder also comprises a mixer for mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at the second quality level to produce a mixed signal. The encoder is arranged such that: the second encoder encodes the signal carrying a representation of the image at a second quality level based on the mixed signal; and the factors are selected based on a measure of noise introduced by the first encoder and the second encoder when producing the predictions. A corresponding decoder and methods of decoding and encoding are also described.
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Citations
157 Claims
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1-112. -112. (canceled)
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113. An image encoding-decoding system comprising:
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(a) an encoder for encoding a signal carrying a representation of an image; and
(b) a decoder for decoding signals carrying an encoded representation of an image wherein;
the encoder comprises;
(1) a first encoder for encoding a signal carrying a representation of an image at a first quality level;
(2) a second encoder for encoding a signal carrying a representation of the image at a second quality level at greater quality than the first quality level and wherein the encoder is arranged such that the second encoder encodes the signal carrying a representation of the image at a second quality level based upon at least one of;
(i) a mixed signal provided from mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at the second quality level to produce the mixed signal wherein the factors are selected based upon a measure of noise introduced by the first encoder and the second encoder when producing the predictions; and
(ii) a signal carrying a frequency domain representation of a prediction of the image at both the first quality level and at the second quality level; and
the decoder comprises;
(1) a first decoder for decoding a signal carrying an encoded representation of an image at a first quality level; and
(2) a second decoder for decoding a signal carrying an encoded representation of the image at a second quality level at greater quality than the first quality level and wherein the decoder is arranged such that the second decoder decodes the signal carrying an encoded representation of the image at a second quality level based upon at least one of;
(i) a mixed signal provided by a mixer for mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at the second quality level to produce a mixed signal wherein the factors are selected based on a measure of noise introduced when producing the predictions during encoding and which are available to the decoder; and
(ii) a signal carrying a frequency domain representation of a prediction of the image at both the first quality level and at the second quality level. - View Dependent Claims (114, 115, 116, 117)
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118. An encoder for encoding a signal carrying a representation of an image, the encoder comprising:
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a first encoder for encoding a signal carrying a representation of an image at a first quality level;
a second encoder for encoding a signal carrying a representation of the image at a second quality level at greater quality than the first quality level; and
a mixer for mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at the second quality level to produce a mixed signal;
wherein the encoder is arranged such that;
the second encoder encodes the signal carrying a representation of the image at a second quality level based on the mixed signal; and
the factors are selected based on a measure of noise introduced by the first encoder and the second encoder when producing the predictions. - View Dependent Claims (119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132)
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133. A decoder for decoding signals carrying an encoded representation of an image, the decoder comprising:
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a first decoder for decoding a signal carrying an encoded representation of an image at a first quality level;
a second decoder for decoding a signal carrying an encoded representation of the image at a second quality level at greater quality than the first quality level; and
a mixer for mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at the second quality level to produce a mixed signal;
wherein the decoder is arranged such that;
the second decoder decodes the signal carrying an encoded representation of the image at a second quality level based on the mixed signal; and
the factors are selected based on a measure of noise introduced when producing the predictions during encoding and which are available to the decoder. - View Dependent Claims (134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149)
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150. A method of encoding a signal carrying a representation of an image, the method comprising:
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encoding a signal carrying a representation of an image at a first quality level;
mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at the second quality level to produce a mixed signal;
encoding the signal carrying a representation of the image at a second quality level based on the mixed signal; and
selecting the factors based on a measure of noise introduced by the first encoder and the second encoder when producing the predictions. - View Dependent Claims (151, 152, 153)
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154. A method of decoding a signal carrying an encoded representation of an image, the method comprising:
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decoding a signal carrying an encoded representation of an image at a first quality level;
mixing a factor of a signal carrying a representation of a prediction of the image at the first quality level and a factor of a signal carrying a representation of a prediction of the image at a second quality level greater quality than the first quality level to produce a mixed signal;
decoding a signal carrying an encoded representation of the image at a second quality level based on the mixed signal; and
selecting the factors based on a measure of noise introduced when producing the predictions during encoding and which are available to the decoder. - View Dependent Claims (155, 156, 157)
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Specification