Video coding and video decoding apparatus for enlarging a decoded alpha-map signal in accordance with a reduction ratio setting information signal
First Claim
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1. A picture decoding apparatus comprising:
- a demultiplexing section configured to demultiplex a coded signal into an alpha-map signal for discriminating a picture between an object region and a background region, and a coded picture signal, the alpha-map signal including a reduction ratio setting information signal for reducing an amount of generated codes of the alpha-map signal, the reduction ratio setting information signal indicating a conversion ratio of 1, 1/2 or 1/4;
an alpha-map decoder section configured to decode the demultiplexed alpha-map signal to separate it into a decoded alpha-map and reduction ratio setting information;
a resolution conversion section configured to enlarge the decoded alpha-map signal in accordance with the reduction ratio setting information indicating a conversion ratio of 1, 1/2 or 1/4 to generate an enlarged alpha-map signal; and
a picture decoding section configured to decode the coded picture signal in accordance with the enlarged alpha-map signal while checking whether the current picture is located in the object region or the background region to output a reconstruction signal.
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Abstract
A video encoding apparatus is provided with a resolution converting section, an encoding section, and a transmitting section. The resolution converting section enlarges or reduces a binary picture which represents the shape of an object. The encoding section encodes a binary picture reduced by the resolution converting section. The reduction ratio used by the resolution converting section is encoded, and the transmitting section transmits this encoded reduction ratio along with encoded data on the binary picture. The amount of encoded data produced from the encoding section is controlled by changing the enlargement/reduction ratio used by the resolution converting section.
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Citations
14 Claims
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1. A picture decoding apparatus comprising:
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a demultiplexing section configured to demultiplex a coded signal into an alpha-map signal for discriminating a picture between an object region and a background region, and a coded picture signal, the alpha-map signal including a reduction ratio setting information signal for reducing an amount of generated codes of the alpha-map signal, the reduction ratio setting information signal indicating a conversion ratio of 1, 1/2 or 1/4; an alpha-map decoder section configured to decode the demultiplexed alpha-map signal to separate it into a decoded alpha-map and reduction ratio setting information; a resolution conversion section configured to enlarge the decoded alpha-map signal in accordance with the reduction ratio setting information indicating a conversion ratio of 1, 1/2 or 1/4 to generate an enlarged alpha-map signal; and a picture decoding section configured to decode the coded picture signal in accordance with the enlarged alpha-map signal while checking whether the current picture is located in the object region or the background region to output a reconstruction signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A picture decoding apparatus comprising:
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a demultiplexing section configured to demultiplex a coded signal into a binary picture signal for discriminating a picture between an object region and a background region, and a coded picture signal, the binary picture signal including a reduction ratio setting information signal for reducing an amount of generated codes of the binary picture signal, the reduction ratio setting information signal indicating a conversion ratio of 1, 1/2 or 1/4; a binary decoder section configured to decode the demultiplexed binary picture signal to separate it into a decoded binary picture signal and reduction ratio setting information; a resolution conversion section configured to enlarge the decoded binary signal in accordance with the reduction ratio setting information indicating a conversion ratio of 1, 1/2 or 1/4 to generate an enlarged binary signal; and a picture decoding section configured to decode the coded picture signal in accordance with the enlarged binary signal while checking whether the current picture is located in the object region or the background region to output a reconstruction signal. - View Dependent Claims (8, 9, 10, 11)
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12. A picture decoding method comprising the steps of:
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demultiplexing a coded signal into an alpha-map signal for discriminating a picture between an object region and a background region, and a coded picture signal, the alpha-map signal including a reduction ratio setting information signal for reducing an amount of generated codes of the alpha-map signal, the reduction ratio setting information signal indicating a conversion ratio of 1, 1/2 or 1/4; decoding the demultiplexed alpha-map signal to separate it into a decoded alpha-map and reduction ratio setting information to generate a decoded alpha-map signal; enlarging the decoded alpha-map signal in accordance with the reduction ratio setting information indicating a conversion ratio of 1, 1/2 or 1/4 to generate an enlarged alpha-map signal; and decoding the coded picture signal in accordance with the enlarged alpha-map signal while checking whether the current picture is located in the object region or the background region to output a reconstruction signal. - View Dependent Claims (13)
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14. A picture decoding method comprising the steps of:
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demultiplexing a coded signal into a binary picture signal for discriminating a picture between an object region and a background region, and a coded picture signal, the binary picture signal including a reduction ratio setting information signal for reducing an amount of generated codes of the binary picture signal, the reduction ratio setting information signal indicating a conversion ratio of 1, 1/2 or 1/4; decoding the demultiplexed binary picture signal to separate it into a decoded binary picture signal and reduction ratio setting information; enlarging the decoded binary signal in accordance with the reduction ratio setting information indicating a conversion ratio of 1, 1/2 or 1/4 to generate an enlarged binary signal; and decoding the coded picture signal in accordance with the enlarged binary signal while checking whether the current picture is located in the object region or the background region to output a reconstruction signal.
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Specification