Video coding and video decoding apparatus for changing a resolution conversion according to a reduction ratio setting information signal
First Claim
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1. A picture encoding apparatus comprising:
- a resolution conversion section for reducing a picture signal applied to a first input thereof to control an amount of generated codes of the picture signal by changing a resolution conversion according to a reduction ratio setting information signal applied to a second input thereof and indicating a conversion ratio of 1, 1/2 or 1/4, the picture signal indicating information for discriminating a picture between an object region and a background region, the resolution conversion section outputting a reduced picture signal;
an encoder connected to the resolution conversion section and receiving the reduction ratio setting information signal, for encoding the reduced picture signal output from said resolution conversion section and for outputting coded picture data;
a multiplexer connected to the encoder and the reduction ratio setting information signal, for multiplexing the coded picture data and the reduction ratio setting information signal and outputting a multiplexed signal; and
an enlargement resolution conversion section for inputting the reduced picture signal output by the resolution conversion section and for outputting a local decoded signal which has been enlarged by an amount which inversely corresponds to the reduction ratio setting information signal output by the conversion ratio of 1, 1/2 or 1/4.
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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
9 Claims
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1. A picture encoding apparatus comprising:
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a resolution conversion section for reducing a picture signal applied to a first input thereof to control an amount of generated codes of the picture signal by changing a resolution conversion according to a reduction ratio setting information signal applied to a second input thereof and indicating a conversion ratio of 1, 1/2 or 1/4, the picture signal indicating information for discriminating a picture between an object region and a background region, the resolution conversion section outputting a reduced picture signal; an encoder connected to the resolution conversion section and receiving the reduction ratio setting information signal, for encoding the reduced picture signal output from said resolution conversion section and for outputting coded picture data; a multiplexer connected to the encoder and the reduction ratio setting information signal, for multiplexing the coded picture data and the reduction ratio setting information signal and outputting a multiplexed signal; and an enlargement resolution conversion section for inputting the reduced picture signal output by the resolution conversion section and for outputting a local decoded signal which has been enlarged by an amount which inversely corresponds to the reduction ratio setting information signal output by the conversion ratio of 1, 1/2 or 1/4. - View Dependent Claims (2, 3)
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4. A picture encoding apparatus comprising:
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a resolution conversion section configured to reduce a picture signal applied to a first input thereof to control an amount of generated codes of the picture signal by changing a resolution conversion according to a reduction ratio setting information signal applied to a second input thereof and indicating a conversion ratio of 1, 1/2 or 1/4, the picture signal indicating information for discriminating a picture between an object region and a background region, the resolution conversion section outputting a reduced picture signal; an encoder connected to the resolution conversion section and receiving the reduction ratio setting information signal, said encoder being configured to encode the reduced picture signal output from said resolution conversion section using the reduction ratio setting information signal and to output coded picture data; a multiplexer connected to the encoder and receiving the reduction ratio setting information signal, said multiplexer being configured to multiplex the coded picture data and the reduction ratio setting information signal and to output a multiplexed signal; and an enlargement resolution conversion section configured to receive the reduced picture signal output by the resolution conversion section and the reduction ratio setting information signal and to output a local decoded signal which has been enlarged by an amount which inversely corresponds to the reduction ratio setting information signal indicating the conversion ratio of 1, 1/2 or 1/4. - View Dependent Claims (5, 6)
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7. A picture encoding method comprising:
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reducing an input picture signal to obtain a reduced picture signal and to control an amount of generated codes of the input picture signal by changing a resolution conversion according to a reduction ratio setting information signal and indicating a conversion ratio of 1, 1/2 or 1/4, the input picture signal indicating information for discriminating a picture between an object region and a background region; encoding the reduced picture signal in accordance with the reduction ratio setting information signal to obtain coded picture data; multiplexing the coded picture data and the reduction ratio setting information signal to obtain a multiplexed signal; receiving the reduced picture signal and the reduction ratio setting information signal; and outputting a local decoded signal which has been enlarged by an amount which inversely corresponds to the reduction ratio setting information signal indicating the conversion ratio of 1, 1/2 or 1/4. - View Dependent Claims (8, 9)
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Specification